1. A reservoir displacement unit dividing method is characterized by comprising the following steps:

establishing a flow non-uniform distribution curve based on a hydrodynamic principle and a flow mathematical statistical method;

determining the partition boundaries of different flow velocity flow areas of the oil reservoir according to the flow non-uniform distribution curve;

establishing a water saturation distribution model based on a two-phase seepage theory and a streamline equation;

and determining the water content of the flow area at different flow velocities according to the water saturation distribution model.

2. The reservoir displacement unit partitioning method according to claim 1, wherein the establishing of the flow non-uniform distribution curve based on hydrodynamic principles and flow mathematical statistics comprises:

based on a hydrodynamic principle and a flow mathematical statistical method, obtaining the flow contribution rate of a corresponding well pattern according to a pressure control area;

in the formula: theta-flow contribution rate;

θ₅-inverse five point well pattern flow contribution rate;

θ₇-triangular inverted seven-point well pattern flow contribution rate;

θ_9b-inverse nine points well pattern side well flow contribution rate;

θ_9j-inverse nine-point well pattern angular well flow contribution rate;

-inverse five points well pattern streamline sweep angle, rad;

-inverse seven-point well pattern streamline sweep angle, rad;

-inverse nine points profile sidetrack well streamline sweep angle, rad;

-inverse nine-point well pattern angular well stream line sweep angle, rad;

dQ-flow infinitesimal on the main interface;

converting the angle swept by the streamline into displacement area percentage according to the flow contribution rates of different well patterns to obtain flow non-uniform distribution curve analytical formulas in different well pattern modes:

in the formula, the S-displacement area percentage is percent.

3. The reservoir displacement unit partitioning method according to any one of claims 1 to 2, wherein the determining the partition boundaries of the flow regions with different flow velocities of the reservoir according to the flow non-uniform distribution curve comprises:

obtaining a flow rate representation value by derivation of the flow non-uniform distribution curve;

determining a flow rate level for each of the flow zones based on the flow rate characterizing values.

4. The reservoir displacement unit partitioning method as claimed in claim 1, wherein the water saturation distribution model comprises:

the water saturation of a streamline before water breakthrough of an oil well:

and, the water saturation of the whole area after water breakthrough of the oil well:

in the formula (I), the compound is shown in the specification,-angle of streamline sweep, rad;

-the angle between the two-phase seepage drive edge flow line and the main flow line, rad;

d-half of the injection-production well spacing, m;

t-production time, s;

h-formation thickness, m;

q-amount of liquid production, m³/s；

-the average water saturation of the flow line at an angle phi from the main flow line at time t before water breakthrough;

K_ro-oil phase relative permeability,%;

K_rw-relative permeability of the aqueous phase,%;

μ_o-viscosity of the oil, mPa · s;

μ_w-viscosity of water, mPa · s;

S_wf-displacement front water saturation,%;

S_wc-irreducible water saturation,%;

-average water saturation of formation,%, at time water flooding t;

-average water saturation,%, between any two points on the flow line;

r-distance, m, from any point in the formation to the well;

distance of water-flooding front from well, m.

5. The reservoir displacement unit partitioning method as claimed in claim 4, wherein said determining water cut of said flow region at different flow rates according to said water saturation distribution model comprises:

and determining the oil displacement efficiency levels of different areas according to the water content of the different areas.

6. A reservoir displacement unit partitioning apparatus, comprising: a curve establishing module, a limit dividing module, a model establishing module and a water content determining module, wherein,

the curve establishing module is used for establishing a flow non-uniform distribution curve based on a hydrodynamic principle and a flow mathematical statistical method;

the boundary dividing module is used for determining the dividing boundaries of the flow areas with different flow velocities of the oil reservoir according to the flow non-uniform distribution curve;

the model establishing module is used for establishing a water saturation distribution model based on a two-phase seepage theory and a streamline equation;

and the water content determining module is used for determining the water content of the flow area at different flow rates according to the water saturation distribution model.

7. The reservoir displacement unit partitioning device according to claim 6, wherein the curve establishing module is specifically configured to:

based on a hydrodynamic principle and a flow mathematical statistical method, obtaining the flow contribution rate of a corresponding well pattern according to a pressure control area;

in the formula: theta-flow contribution rate;

θ₅-inverse five point well pattern flow contribution rate;

θ₇-triangular inverted seven-point well pattern flow contribution rate;

θ_9b-inverse nine points well pattern side well flow contribution rate;

θ_9j-inverse nine-point well pattern angular well flow contribution rate;

-inverse five points well pattern streamline sweep angle, rad;

-inverse seven-point well pattern streamline sweep angle, rad;

-inverse nine points profile sidetrack well streamline sweep angle, rad;

-inverse nine-point well pattern angular well stream line sweep angle, rad;

dQ-flow infinitesimal on the main interface;

and converting the angle swept by the streamline into displacement area percentage according to the flow contribution rate of different well patterns to obtain flow non-uniform distribution curve analytical formulas in different well pattern modes:

in the formula, the S-displacement area percentage is percent.

8. The reservoir displacement unit partitioning device according to any one of claims 6 to 7, wherein the boundary partitioning module is specifically configured to: and deriving the flow non-uniform distribution curve to obtain a flow rate characterization value, and determining the flow rate level of each flow area according to the flow rate characterization value.

9. The reservoir displacement unit partitioning apparatus as claimed in claim 6, wherein the water saturation distribution model comprises:

the water saturation of a streamline before water breakthrough of an oil well:

and, the water saturation of the whole area after water breakthrough of the oil well:

in the formula (I), the compound is shown in the specification,-angle of streamline sweep, rad;

-the angle between the two-phase seepage drive edge flow line and the main flow line, rad;

d-half of the injection-production well spacing, m;

t-production time, s;

h-formation thickness, m;

q-amount of liquid production, m³/s；

-the average water saturation of the flow line at an angle phi from the main flow line at time t before water breakthrough;

K_ro-oil phase relative permeability,%;

K_rw-relative permeability of the aqueous phase,%;

μ_o-viscosity of the oil, mPa · s;

μ_w-viscosity of water, mPa · s;

S_wf-displacement front water saturation,%;

S_wc-irreducible water saturation,%;

-average water saturation of formation,%, at time water flooding t;

-average water saturation,%, between any two points on the flow line;

r-distance, m, from any point in the formation to the well;

distance of water-flooding front from well, m.

10. The reservoir displacement unit partitioning device according to claim 9, wherein the water content determining module is specifically configured to determine the oil displacement efficiency levels of different regions according to the water contents of the different regions.

Background

The residual oil is extremely complicated in the later stage of oil reservoir development, an oil-water dominant channel is formed in long-term water injection development, inefficient invalid water injection circulation is caused, the water flooding wave range is reduced, and the ultimate recovery ratio of the oil reservoir is influenced. The internal reason for the formation of the oil-water dominant channel is the non-uniform distribution of fluid in the oil reservoir, and the non-uniform distribution of flow is mainly influenced by the spatial distribution of reservoir parameters. Therefore, in the later stage of oil reservoir development, in order to research the distribution rule of residual oil, oil reservoir fine description is developed at home and abroad.

The main tasks of the fine description of the oil reservoir are the research of micro-structure, deposition micro-phase and flow unit division. The study of microstructure and sedimentary microfacies is a reservoir fine description method mainly based on geological study, which does not closely combine reservoir development dynamics and cannot reflect the non-uniform condition of fluid flow; the flow cell method not only promotes the quantitative description of the geologic body, but also improves the combination of the geology and the oil reservoir to a certain extent. Therefore, the method which is the most important method in the fine description of the oil reservoir is widely applied to the field of exploration and development of the oil reservoir. However, the main focus of the current reservoir description method represented by the flow unit is geological quantitative description, and the division result is mostly based on static geological parameters, so that the non-uniform distribution of displacement conditions of the reservoir when fluid flows in the reservoir at different development stages cannot be reflected, and the accuracy of the description result is reduced.

Therefore, the key point of the oil reservoir description is to establish a method for accurately and quantitatively describing the non-uniform distribution of the effective displacement units of the oil reservoir based on credible dynamic and static oil reservoir data, describe the non-uniform distribution state of the fluid displacement conditions of the oil reservoir in different development stages, match the oil reservoir description result with the development effect and better serve for reasonable oil reservoir development.

Disclosure of Invention

In order to solve at least one of the above technical problems, the present disclosure provides a reservoir displacement unit partitioning method and apparatus.

In a first aspect, the present disclosure provides a reservoir displacement unit partitioning method, including:

establishing a flow non-uniform distribution curve based on a hydrodynamic principle and a flow mathematical statistical method;

determining the partition boundaries of different flow velocity flow areas of the oil reservoir according to the flow non-uniform distribution curve;

establishing a water saturation distribution model based on a two-phase seepage theory and a streamline equation;

and determining the water content of the flow area at different flow velocities according to the water saturation distribution model.

Optionally, the creating a flow non-uniform distribution curve based on a hydrodynamic principle and a flow mathematical statistical method includes:

based on a hydrodynamic principle and a flow mathematical statistical method, obtaining the flow contribution rate of a corresponding well pattern according to a pressure control area;

in the formula: theta-flow contribution rate;

θ₅-inverse five point well pattern flow contribution rate;

θ₇-triangular inverted seven-point well pattern flow contribution rate;

θ_9b-inverse nine points well pattern side well flow contribution rate;

θ_9j-inverse nine-point well pattern angular well flow contribution rate;

-inverse five points well pattern streamline sweep angle, rad;

-inverse seven-point well pattern streamline sweep angle, rad;

-inverse nine points profile sidetrack well streamline sweep angle, rad;

-inverse nine-point well pattern angular well stream line sweep angle, rad;

dQ-flow infinitesimal on the main interface;

converting the angle swept by the streamline into displacement area percentage according to the flow contribution rates of different well patterns to obtain flow non-uniform distribution curve analytical formulas in different well pattern modes:

in the formula, the S-displacement area percentage is percent.

Optionally, the determining the partition boundaries of the flow zones with different flow velocities of the oil reservoir according to the flow non-uniform distribution curve includes:

obtaining a flow rate representation value by derivation of the flow non-uniform distribution curve;

determining a flow rate level for each of the flow zones based on the flow rate characterizing values.

Optionally, the water saturation distribution model comprises:

the water saturation of a streamline before water breakthrough of an oil well:

and, the water saturation of the whole area after water breakthrough of the oil well:

in the formula (I), the compound is shown in the specification,-angle of streamline sweep, rad;

two-phase seepage floodingThe included angle between the edge streamline and the main streamline, rad;

d-half of the injection-production well spacing, m;

t-production time, s;

h-formation thickness, m;

q-amount of liquid production, m³/s；

-the average water saturation of the flow line at an angle phi from the main flow line at time t before water breakthrough;

K_ro-oil phase relative permeability,%;

K_rw-relative permeability of the aqueous phase,%;

μ_o-viscosity of the oil, mPa · s;

μ_w-viscosity of water, mPa · s;

S_wf-displacement front water saturation,%;

S_wc-irreducible water saturation,%;

-average water saturation of formation,%, at time water flooding t;

-average water saturation,%, between any two points on the flow line;

r-distance, m, from any point in the formation to the well;

distance of water-flooding front from well, m.

Optionally, the determining the water content of the flow area at different flow rates according to the water saturation distribution model includes:

and determining the oil displacement efficiency levels of different areas according to the water content of the different areas.

In a second aspect, the present invention provides a reservoir displacement unit partitioning apparatus, comprising: a curve establishing module, a limit dividing module, a model establishing module and a water content determining module, wherein,

the curve establishing module is used for establishing a flow non-uniform distribution curve based on a hydrodynamic principle and a flow mathematical statistical method;

the boundary dividing module is used for determining the dividing boundaries of the flow areas with different flow velocities of the oil reservoir according to the flow non-uniform distribution curve;

the model establishing module is used for establishing a water saturation distribution model based on a two-phase seepage theory and a streamline equation;

and the water content determining module is used for determining the water content of the flow area at different flow rates according to the water saturation distribution model.

Optionally, the curve establishing module is specifically configured to:

based on a hydrodynamic principle and a flow mathematical statistical method, obtaining the flow contribution rate of a corresponding well pattern according to a pressure control area;

in the formula: theta-flow contribution rate;

θ₅-inverse five point well pattern flow contribution rate;

θ₇-triangular inverted seven-point well pattern flow contribution rate;

θ_9b-inverse nine points well pattern side well flow contribution rate;

θ_9j-inverse nine-point well pattern angular well flow contribution rate;

-inverse five points well pattern streamline sweep angle, rad;

-inverse seven-point well pattern streamline sweep angle, rad;

-inverse nine points profile sidetrack well streamline sweep angle, rad;

-inverse nine-point well pattern angular well stream line sweep angle, rad;

dQ-flow infinitesimal on the main interface;

and converting the angle swept by the streamline into displacement area percentage according to the flow contribution rate of different well patterns to obtain flow non-uniform distribution curve analytical formulas in different well pattern modes:

in the formula, the S-displacement area percentage is percent.

Optionally, the boundary dividing module is specifically configured to: and deriving the flow non-uniform distribution curve to obtain a flow rate characterization value, and determining the flow rate level of each flow area according to the flow rate characterization value.

Optionally, the water saturation distribution model comprises:

the water saturation of a streamline before water breakthrough of an oil well:

and, the water saturation of the whole area after water breakthrough of the oil well:

in the formula (I), the compound is shown in the specification,-angle of streamline sweep, rad;

-the angle between the two-phase seepage drive edge flow line and the main flow line, rad;

d-half of the injection-production well spacing, m;

t-production time, s;

h-formation thickness, m;

q-amount of liquid production, m³/s；

-the average water saturation of the flow line at an angle phi from the main flow line at time t before water breakthrough;

K_ro-oil phase relative permeability,%;

K_rw-relative permeability of the aqueous phase,%;

μ_o-viscosity of the oil, mPa · s;

μ_w-viscosity of water, mPa · s;

S_wf-displacement front water saturation,%;

S_wc-irreducible water saturation,%;

-average water saturation of formation,%, at time water flooding t;

-average water saturation,%, between any two points on the flow line;

r-distance, m, from any point in the formation to the well;

distance of water-flooding front from well, m.

Optionally, the water content determining module is specifically configured to determine the oil displacement efficiency levels of different regions according to the water contents of the different regions.

Compared with the prior art, the method has the following beneficial effects:

according to the method, a division standard is established through a flow non-uniform distribution curve and the ultimate water content, and the reservoir is divided into different areas, so that the oil-water distribution rule and the residual oil cause can be more accurately known, the oil-water distribution rule of the whole oil reservoir in different development stages can be more accurately analyzed, the defects of the existing method are overcome, the residual oil formation mechanism is revealed for searching an invalid water injection circulation area, a practical diving strategy is proposed, and the recovery ratio is improved.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram illustrating a displacement unit flow non-uniform distribution curve provided by an embodiment of the present disclosure;

fig. 2 is a schematic distribution diagram of displacement units in space provided by the embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some embodiments of the present disclosure, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present disclosure belong to the protection scope of the present disclosure.

The disclosed embodiments provide a method for analyzing the flow rate of a reservoir fluid, comprising:

based on a hydrodynamic principle and a flow mathematical statistical method, a flow contribution rate and flow non-uniform distribution curve mathematical model is established, a seepage zone in an oil reservoir water drive wave range is divided into flow zones with different flow velocity levels, and the non-uniform distribution degree of flow is quantitatively analyzed through a flow intensity difference coefficient.

Flow Contribution Rate (CRF): is in line with the main flowThe percentage of the area Flow swept by the streamline of the angle to the total Flow among the injection-production units is the Flow Contribution Rate (distribution Rate of Flow) of the displacement unit, and is represented by a greek character θ:

thus, flow contribution curves for different patterns are derived from the pressure control zones:

in the formula: theta-flow contribution rate;

θ₅-inverse five point well pattern flow contribution rate;

θ₇-triangular inverted seven-point well pattern flow contribution rate;

θ_9b-inverse nine points well pattern side well flow contribution rate;

θ_9j-inverse nine-point well pattern angular well flow contribution rate;

-inverse five points well pattern streamline sweep angle, rad;

-inverse seven-point well pattern streamline sweep angle, rad;

-inverse nine points profile sidetrack well streamline sweep angle, rad;

-inverse nine-point well pattern angular well stream line sweep angle, rad;

dQ-flow infinitesimal on the main interface;

the flow non-uniform distribution curve is a curve formed by flow contribution rates corresponding to the displacement area percentages between any streamline and shunt lines (shaded areas, as shown in fig. 1) in one displacement unit.

Wherein-displacement area percentage,%.

The flow intensity difference coefficient G is A/(A + B), namely the area percentage enclosed by the flow non-uniform distribution curve and the flow absolute uniform distribution curve, wherein the larger G is the more non-uniform flow distribution, and the smaller G is the more uniform. In the formula: a-the area enclosed by the flow absolute uniform distribution curve and the flow non-uniform distribution curve, m 2; b-area defined by absolute uneven distribution curve of flow and uneven distribution curve of flow, m²。

And (3) deriving the flow non-uniform distribution curve to obtain a flow rate characterization value, and determining the flow rate grade of each flow area according to the flow rate characterization value. As in this embodiment, a flow rate characteristic value greater than 1 is a high velocity flow region and a flow rate characteristic value less than 1 is a low velocity flow region.

According to the method, the area of the seepage area and the contributed flow are normalized to obtain a flow non-uniform distribution curve, the flow non-uniform distribution degree is analyzed through the flow non-uniform distribution curve, the reservoir is divided into flow areas with different flow velocity levels, and the oil-water distribution rule of the whole oil reservoir in different development stages is analyzed more accurately.

The present disclosure provides a method for analyzing water content of an oil reservoir, the method comprising:

when the flow is stable, the trajectory of the liquid particle motion is consistent with the streamline, a coordinate system is established by taking the main interface as the y axis and the main streamline as the x axis, the streamline in the streamline family is taken as the path of the liquid particle motion, and the plane water saturation distribution is solved based on the assumption. The water saturation distribution model is divided into two stages before water breakthrough of the oil well and after water breakthrough of the oil well, the flow in the flow pipe before water breakthrough accords with a one-dimensional unstable displacement theory, and the flow after water breakthrough accords with a two-phase seepage theory, so that the water saturation distribution model when constant-speed water injection is carried out between the injection and production units is established.

According to darcy's law, the total flow through the main interface:

therefore, the pressure difference at any time:

the water saturation of a streamline before water breakthrough of an oil well:

the water saturation of the whole area after water breakthrough of the oil well:

wherein, q is the flow per unit oil layer thickness, cm³/s；

A-cross sectional area, m²；

K-permeability, μm²；

p-formation pressure, MPa;

dp-pressure difference at any moment, MPa;

-angle of streamline sweep, rad;

-the angle between the two-phase seepage drive edge flow line and the main flow line, rad;

d-half of the injection-production well spacing, m;

t-production time, s;

h-formation thickness, m;

q-amount of liquid production, m³/s；

-the average water saturation of the flow line at an angle phi from the main flow line at time t before water breakthrough;

K_ro-oil phase relative permeability,%;

K_rw-relative permeability of the aqueous phase,%;

μ_o-viscosity of the oil, mPa · s;

μ_w-viscosity of water, mPa · s;

S_wf-displacement front water saturation,%;

S_wc-irreducible water saturation,%;

-average water saturation of formation,%, at time water flooding t;

-average water saturation,%, between any two points on the flow line;

r-distance, m, from any point in the formation to the well;

-distance of water flooding front from well, m;

the water content of any area at any moment can be obtained through a water saturation distribution model, and the oil displacement efficiency levels of different areas are determined according to the water contents of the different areas. As in this embodiment, the region with the water content exceeding the limit water content of 98% is defined as the ineffective displacement, and conversely, as the effective displacement.

The present disclosure provides a method for partitioning an oil reservoir displacement unit, which includes:

establishing a flow non-uniform distribution curve based on a hydrodynamic principle and a flow mathematical statistical method;

determining the partition boundaries of the flow areas with different flow velocities of the oil reservoir according to the flow non-uniform distribution curve;

establishing a water saturation distribution model based on a two-phase seepage theory and a streamline equation;

and determining the water content of the flow area at different flow velocities according to the water saturation distribution model.

In the embodiment, a high-speed flow area and a low-speed flow area are divided, the water content of each flow area is calculated, and at this time, the seepage areas in the water drive wave and range of the oil deposit can be divided into an I-type high-speed flow ineffective displacement area, an II-type high-speed flow effective displacement area, a III-type low-speed flow ineffective displacement area, an IV-type low-speed flow effective displacement area and four seepage areas. It should be noted that, in different embodiments, the flow rate level of the flow area may be set according to needs, and the oil displacement efficiency level may also be set according to needs, so the type of the seepage area is not limited to the four categories listed in this embodiment.

The following describes the present invention in detail with reference to an application example of a certain block of a certain reservoir:

the block is located on the west wing of a northern anticline structure of a certain oil reservoir, and develops various river flows, namely Delta sediment types. The block has serious sand-mud-rock interbed, plane and longitudinal heterogeneity. The elevation of the top surface of the oil reservoir is about 150m, the depth of the oil reservoir is about 1000m, and the burial depth is 900-1200 m. The effective sandstone thickness of the research area is 58.19m, and the effective oil layer thickness is 55.68 m. The river channel sand body develops in a large area, is distributed in a connected mode, and has good porosity and permeability, and the physical property of the main river channel is the best.

The crude oil in a block has the characteristics of high viscosity, high wax content, high solidifying point and low sulfur content. The region is a anticline sandstone reservoir without an air top, and has an inactive edge water and a bottom water and a unified pressure system.

The existing flow cell, whether the FZI method or the multi-parameter analysis method is commonly used, deviates from the fact that the flow cell is a reservoir cell with similar seepage characteristics from the geological perspective, and different cells have the essence of different seepage characteristics. The flow units divided by the method are unique in result, the higher the grading is, the better the physical property of the reservoir is, and the non-uniform distribution degree of the flow in the reservoir development, namely the contribution of different seepage areas in different development stages to the oil well yield, cannot be described quantitatively. Therefore, it is not widely used in most reservoirs. The method analyzes the conditions of flow non-uniform distribution and ineffective displacement through analyzing a certain oil reservoir block, and provides a new oil reservoir analysis method for development and adjustment.

The method for finely analyzing the actual oil reservoir comprises the following steps:

firstly, determining the area sweep coefficient of each injection-production unit by combining a sedimentary microphase diagram, a numerical simulation residual oil distribution diagram and a theoretical method, and separating an unswept region, an interlayer shielding region and a pressure balance region;

secondly, analyzing the configuration of a reservoir, analyzing the distribution, the shielding condition, the interlayer and intrastratal heterogeneity of the internal permeability of different injection and production units of the heterogeneous oil reservoir, determining the partition boundary of high-speed and low-speed flow areas under different well pattern modes through a flow heterogeneous distribution curve, and dividing the reservoir into a high-speed flow area and a low-speed flow area; in this embodiment, a flow rate characteristic value greater than 1 is a high velocity flow region and a flow rate characteristic value less than 1 is a low velocity flow region.

And finally, solving the saturation through a water saturation distribution model, dividing an invalid displacement area and an effective displacement area, and dividing the displacement unit into four types of seepage areas, namely an I type high-speed flowing invalid displacement area, an II type high-speed flowing effective displacement area, a III type low-speed flowing invalid displacement area and an IV type low-speed flowing effective displacement area. As in this embodiment, the region with the water content exceeding the limit water content of 98% is defined as the ineffective displacement, and conversely, as the effective displacement.

The distribution diagram of the seepage zone can be obtained through block division, 46I-type seepage zones (high-speed flow ineffective drive), 16 II-type seepage zones (effective seepage zone: high-speed flow effective drive), 4 III-type seepage zones (low-speed flow ineffective drive), 47 IV-type seepage zones (effective seepage zone: low-speed flow effective drive) are arranged at the upper part of the oil reservoir, the I-type seepage zones and the IV-type seepage zones mainly exist on the plane, namely the high-speed flow ineffective drive and the low-speed flow effective drive, the I-type seepage zones (high-speed flow ineffective drive) are main adjusting areas, and the IV-type seepage zones (effective seepage zones: low-speed flow effective drive) are main diving areas.

The method divides the reservoir into different areas, so that the oil-water distribution rule and the residual oil cause can be more accurately known, the oil-water distribution rule of the whole oil reservoir in different development stages can be more accurately analyzed, the defects of the existing fine-scanning method are overcome, the residual oil formation mechanism is revealed for searching an invalid water injection circulation area, a practical excavation and submergence strategy is provided, and the recovery ratio is improved. For example, different effective seepage areas have different characteristics, and corresponding adjustment countermeasures can be provided according to the characteristics. Combining the residual oil distribution diagram and the seepage area distribution diagram, the main type of the reservoir residual oil is shielding residual oil, the formation reasons are interlayer shielding, side lamination shielding and fault shielding, the fault and interlayer shielding and potential excavating strategy is well network encryption, the side lamination shielding and potential excavating strategy is water injection along the side lamination with a small selected inclination angle in the water injection direction, the main contradiction of the reservoir at present is I type effective seepage area (high-speed flow ineffective drive), namely the generation of ineffective circulation, the deep profile control or glue placement dam formation is carried out on the ineffective circulation drive by combining the residual oil distribution and the seepage area distribution diagram, the object easy to excavate potential in the later development stage is IV type effective seepage area (low-speed flow effective drive), and the potential excavating strategy is well network encryption or the change of the liquid flow direction according to the actual situation.

The present disclosure provides an apparatus for analyzing a flow rate of a reservoir fluid, the apparatus comprising: a curve establishing module and a limit dividing module, wherein,

the curve establishing module is used for establishing a flow non-uniform distribution curve based on a hydrodynamic principle and a flow mathematical statistical method;

and the boundary dividing module is used for determining the boundaries of the flow areas with different flow velocities of the oil reservoir according to the flow non-uniform distribution curve.

In an embodiment of the present invention, the creating a flow non-uniform distribution curve based on hydrodynamic principle and a flow mathematical statistical method includes:

based on a hydrodynamic principle and a flow mathematical statistical method, obtaining the flow contribution rate of a corresponding well pattern according to a pressure control area;

obtaining flow contribution rate curves of corresponding well patterns according to the flow contribution rates of different well patterns;

wherein θ -flow contribution rate;

θ₅-inverse five point well pattern flow contribution rate;

θ₇-triangular inverted seven-point well pattern flow contribution rate;

θ_9b-inverse nine points well pattern side well flow contribution rate;

θ_9j-inverse nine-point well pattern angular well flow contribution rate;

-inverse five points well pattern streamline sweep angle, rad;

-inverse seven-point well pattern streamline sweep angle, rad;

-inverse nine points profile sidetrack well streamline sweep angle, rad;

-inverse nine-point well pattern angular well stream line sweep angle, rad;

dQ-flow infinitesimal on the main interface;

obtaining non-uniform distribution curves of corresponding well patterns according to the flow contribution rates of different well patterns;

wherein, S-displacement area percentage,%.

In one embodiment of the invention, the apparatus further comprises: a curve derivation module and a flow rate classification module, wherein,

the curve derivation module is used for deriving the flow non-uniform distribution curve to obtain a flow rate representation value;

and the flow rate grading module is used for determining the flow rate grade of each flow area according to the flow rate characterization value.

The utility model provides a device of analysis oil deposit moisture content, the device includes: a model building module and a moisture determination module, wherein,

the model establishing module is used for establishing a water saturation distribution model based on a two-phase seepage theory and a streamline equation;

and the water content determining module is used for determining the water content of different areas of the oil reservoir according to the water saturation distribution model.

In one embodiment of the invention, the water saturation distribution model comprises:

the water saturation of a streamline before water breakthrough of an oil well:

the water saturation of the whole area after water breakthrough of the oil well:

wherein the content of the first and second substances,-angle of streamline sweep, rad;

-the angle between the two-phase seepage drive edge flow line and the main flow line, rad;

d-half of the injection-production well spacing, m;

t-production time, s;

h-formation thickness, m;

q-amount of liquid production, m³/s；

-the average water saturation of the flow line at an angle phi from the main flow line at time t before water breakthrough;

K_ro-oil phase relative permeability,%;

K_rw-relative permeability of the aqueous phase,%;

μ_o-viscosity of the oil, mPa · s;

μ_w-viscosity of water, mPa · s;

s_wf-displacement front water saturation,%;

S_wc-irreducible water saturation,%;

formation averaging at time-waterflood tWater saturation,%;

-average water saturation,%, between any two points on the flow line;

r-distance, m, from any point in the formation to the well;

distance of water-flooding front from well, m.

In one embodiment of the invention, the apparatus further comprises: and the oil displacement grading module is used for determining the oil displacement efficiency grades of different areas according to the water content of the different areas.

The present disclosure provides a device is divided to oil reservoir displacement unit, and the device includes: the device for analyzing the flow rate of reservoir fluid and the device for analyzing the water content of the reservoir are provided by the present disclosure, wherein,

the curve establishing module is used for establishing a flow non-uniform distribution curve based on a hydrodynamic principle and a flow mathematical statistical method;

the boundary dividing module is used for determining the dividing boundary of the flow areas with different flow velocities of the oil reservoir according to the flow non-uniform distribution curve;

the model establishing module is used for establishing a water saturation distribution model based on a two-phase seepage theory and a streamline equation;

and the water content determining module is used for determining the water content of the flow area at different flow rates according to the water saturation distribution model.

It should be understood that the various techniques described herein may be implemented in connection with hardware or software or, alternatively, with a combination of both. Thus, the methods and apparatus of the present disclosure, or certain aspects or portions thereof, may take the form of program code (i.e., instructions) embodied in tangible media, such as floppy diskettes, CD-ROMs, hard drives, or any other machine-readable storage medium, wherein, when the program is loaded into and executed by a machine, such as a computer, the machine becomes an apparatus for practicing the disclosure.

In the case of program code execution on programmable computers, the computing device will generally include a processor, a storage medium readable by the processor (including volatile and non-volatile memory and/or storage elements), at least one input device, and at least one output device. Wherein the memory is configured to store program code; the processor is configured to perform the various methods of the present disclosure according to instructions in the program code stored in the memory.

By way of example, and not limitation, computer readable media may comprise computer storage media and communication media. Computer-readable media includes both computer storage media and communication media. Computer storage media store information such as computer readable instructions, data structures, program modules or other data. Communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media. Combinations of any of the above are also included within the scope of computer readable media.

It should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the method of the invention should not be construed to reflect the intent: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing inventive embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.

Those skilled in the art will appreciate that the modules or units or components of the apparatus in the examples invented herein may be arranged in an apparatus as described in this embodiment or alternatively may be located in one or more apparatuses different from the apparatus in this example. The modules in the foregoing examples may be combined into one module or may be further divided into multiple sub-modules.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features of the invention in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so invented, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature of the invention in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Moreover, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the disclosure and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

Furthermore, some of the described embodiments are described herein as a method or combination of method elements that can be performed by a processor of a computer system or by other means of performing the described functions. A processor having the necessary instructions for carrying out the method or method elements thus forms a means for carrying out the method or method elements. Further, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is used to implement the functions performed by the elements for the purpose of carrying out the invention.

As used herein, unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

While the disclosure has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the disclosure as described herein. Moreover, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the disclosed subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The invention disclosed herein is to be considered as illustrative and not restrictive in character, with the scope of the disclosure being indicated by the appended claims.