1. The utility model provides a constant pressure prevents flowing backward type cover gas recovery unit with adjustable which characterized in that includes:

a first tubular body (17);

a first one-way valve arranged at the outlet end of the first tubular body (17);

a second tubular body (5), said second tubular body (5) being arranged above said first tubular body (17) and the second tubular body (5) being in communication with the first tubular body (17);

a connecting body (10), the outlet end of the connecting body (10) being arranged in one end of the second tubular body (5);

a second one-way valve, which is arranged inside the second tubular body (5) and which is connected to the outlet end of the connecting body (10);

and the pressure adjusting mechanism is arranged at the other end of the second tubular body (5) and is in transmission fit with the second one-way valve.

2. The adjustable constant-pressure backflow-preventing type sleeve gas recovery device according to claim 1, wherein the first one-way valve comprises:

a first seat (11), said first seat (11) being arranged at an outlet end of said first tubular body (17);

a first ball sleeve (12), the first ball sleeve (12) being arranged at an outlet end of the first ball seat (11);

a first sealing sphere (16), the first sealing sphere (16) being disposed at an outlet end of the first ball seat (11);

and one end of the first ball rod (14) is connected with the first sealed ball body (16), and the other end of the first ball rod (14) extends out of the first ball sleeve (12).

3. The adjustable constant-pressure backflow-preventing type sleeve gas recovery device according to claim 2, wherein a first compression spring (15) is arranged on the first ball rod (14), and the first compression spring (15) is located between the first sealing ball body (16) and the first ball sleeve (12).

4. The adjustable constant-pressure backflow-preventing type sleeve gas recovery device according to claim 3, wherein the second one-way valve comprises:

a second ball seat (8), the second ball seat (8) being provided at an outlet end of the connecting body (10);

a second ball sleeve (18), the second ball sleeve (18) being arranged at an outlet end of the second ball seat (8);

a second sealing sphere (7), the second sealing sphere (7) being disposed at an outlet end of a second ball seat (8);

one end of the second ball rod (4) is connected with the second sealing ball body (8), and the other end of the second ball rod (4) extends out of the second ball sleeve (18).

5. The adjustable constant-pressure backflow-preventing type sleeve gas recovery device according to claim 4, wherein a second compression spring (6) is arranged on the second ball rod (4), and the second compression spring (6) is located between the second sealing ball body (7) and the second ball sleeve (18).

6. The adjustable constant-pressure backflow-preventing type sleeve gas recovery device according to claim 5, wherein the pressure adjusting mechanism comprises:

an adjusting nut (1), wherein the adjusting nut (1) is assembled at the other end of the second tubular body (5) in a threaded mode;

the piston (2) is arranged in the second tubular body (5), and the piston (2) is connected with the part of the adjusting nut (1) extending into the second tubular body (5);

and one end of the third compression spring (3) is connected with the piston (2), and the other end of the third compression spring (3) is connected with the second ball rod (4).

7. The adjustable constant-pressure backflow-preventing type sleeve gas recovery device as claimed in claim 6, wherein an outer cylinder (13) is arranged outside the outlet end of the first tubular body (17).

8. The adjustable constant-pressure backflow-preventing type sleeve gas recovery device as claimed in claim 7, wherein a pressure gauge (9) is arranged on the side of the connecting body (10).

9. The adjustable constant-pressure backflow-preventing type casing gas recovery device according to claim 8, wherein sealing rings (19) are arranged between the first ball seat (11) and the first tubular body (17), between the first tubular body (17) and the outer cylinder (13), between the piston (2) and the second tubular body (5), between the second ball seat (8) and the connecting body (10), and between the connecting body (10) and the second tubular body (5).

10. The adjustable constant-pressure backflow-preventing type sleeve gas recovery device as claimed in claim 9, wherein the first ball seat (11) is provided with a conical surface close to the first sealing ball body (16), and the second ball seat (8) is provided with a conical surface close to the second sealing ball body (7).

Background

In the production process of an oil production well, sleeve gas such as free gas, partial dissolved gas and the like can overflow from a casing of the oil production well, the sleeve gas has the same property as natural gas and can be directly combusted, but the sleeve gas has low yield and therefore does not have the value of industrial exploitation and collection.

At present, most of the sleeve gas is ignited and consumed on site by adopting a torch or is directly released into the atmosphere for treatment, so that the operation wastes resources on one hand and can also bring pollution to the environment on the other hand.

Disclosure of Invention

The invention aims to provide an adjustable constant-pressure backflow-preventing type casing gas recovery device, which meets the technical requirement that casing gas in a casing pipe of an oil production well needs to be collected by reasonably controlling casing pressure in an oil well wellhead gas collection process, and solves the problems of resource waste and environmental pollution in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: an adjustable constant-pressure backflow-preventing type sleeve gas recovery device comprises:

a first tubular body;

a first one-way valve disposed at the outlet end of the first tubular body;

a second tubular body disposed over the first tubular body and in communication therewith;

a connector, an outlet end of the connector being disposed within one end of the second tubular body;

the second one-way valve is arranged in the second tubular body and is connected with the outlet end of the connecting body;

and the pressure adjusting mechanism is arranged at the other end of the second tubular body and is in transmission fit with the second one-way valve.

As a preferred aspect of the present invention, the first check valve includes:

a first ball seat disposed at an outlet end of the first tubular body;

the first ball sleeve is arranged at the outlet end of the first ball seat;

a first sealing ball disposed at an outlet end of the first ball seat;

one end of the first ball rod is connected with the first sealing ball body, and the other end of the first ball rod extends out of the first ball sleeve.

In a preferred embodiment of the present invention, the first ball lever is provided with a first compression spring, and the first compression spring is located between the first seal ball and the first ball sleeve.

As a preferred aspect of the present invention, the second check valve includes:

a second ball seat disposed at an outlet end of the connecting body;

the second ball sleeve is arranged at the outlet end of the second ball seat;

a second sealing ball disposed at an outlet end of the second ball seat;

one end of the second ball rod is connected with the second sealing ball body, and the other end of the second ball rod extends out of the second ball sleeve.

As a preferable aspect of the present invention, the second ball lever is provided with a second compression spring, and the second compression spring is located between the second seal ball and the second ball sleeve.

As a preferred aspect of the present invention, the pressure adjustment mechanism includes:

an adjusting nut screw-fitted to the other end of the second tubular body;

the piston is arranged in the second tubular body and is connected with the part of the adjusting nut extending into the second tubular body;

and one end of the third compression spring is connected with the piston, and the other end of the third compression spring is connected with the second ball rod.

As a preferable aspect of the present invention, an outer cylinder is provided outside the outlet end of the first tubular body.

As a preferable technical solution of the present invention, a pressure gauge is disposed at a side portion of the connecting body.

As a preferable technical solution of the present invention, sealing rings are provided between the first ball seat and the first tubular body, between the first tubular body and the outer cylinder, between the piston and the second tubular body, between the second ball seat and the connecting body, and between the connecting body and the second tubular body.

In a preferred embodiment of the present invention, the first ball seat and the second ball seat are provided with tapered surfaces respectively near the first sealing ball and the second sealing ball.

The invention has the beneficial effects that: (1) the adjustable constant-pressure backflow-preventing casing gas recovery device can be used as a common pressure valve, so that reasonable casing pressure is effectively controlled, gas-liquid separation at the bottom of a pumping well is reduced, and the casing gas recovery effect is improved; (2) the adjustable constant-pressure backflow-preventing type casing gas recovery device can block the back pressure of a well group, prevent oil from flowing backwards, reduce the pressure threshold of casing gas recovery, convey casing gas and oil in a casing pipe into an oil collecting pipeline together, and enable the casing gas and the oil to reach downstream stations for centralized treatment; (3) the adjustable constant-pressure backflow-preventing type sleeve gas recovery device is simple in overall structure, easy to manufacture, convenient to install and good in market popularization and application prospect.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of an adjustable constant-pressure backflow-preventing type sleeve gas recovery device according to the present invention.

In the figure: 1. the ball bearing comprises an adjusting nut, 2, a piston, 3, a third compression spring, 4, a second ball rod, 5, a second tubular body, 6, a second compression spring, 7, a second sealing ball body, 8, a second ball seat, 9, a pressure gauge, 10, a connecting body, 11, a first ball seat, 12, a first ball sleeve, 13, an outer barrel, 14, a first ball rod, 15, a first compression spring, 16, a first sealing ball body, 17, a first tubular body, 18, a second ball sleeve and 19, and a sealing ring.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

As shown in fig. 1, the adjustable constant-pressure backflow-preventing type sleeve gas recovery device in the invention comprises: a first tubular body 17, a first one-way valve, a second tubular body 5, a connecting body 10, a second one-way valve and a pressure regulating mechanism. Wherein: a first one-way valve is provided at the outlet end of the first tubular body 17; the second tubular body 5 is arranged above the first tubular body 17, and the second tubular body 5 communicates with the first tubular body 17; the outlet end of the connecting body 10 is arranged in one end of the second tubular body 5; a second one-way valve is arranged inside the second tubular body 5 and is connected to the outlet end of the connecting body 10; the pressure regulating mechanism is arranged at the other end of the second tubular body 5 and is in transmission fit with the second one-way valve.

The inlet end of the connecting body 10 is connected to the casing of the oil production well, and the two ends of the first tubular body 17 are connected to the oil collecting lines of the oil production well, respectively. When the oil pumping unit descends, the pressure of an oil pipeline at the wellhead is reduced, the first one-way valve is closed at the moment, the influence of back pressure of oil in an oil collecting pipeline can be blocked, the second one-way valve is jacked open under the pressure of sleeve gas in the sleeve due to the fact that the pressure of the oil pipeline at the wellhead is low, and the sleeve gas is discharged into the first tubular body 5 through the second tubular body 4 at the moment; when the oil pumping unit moves upwards, the pressure of an oil pipeline at the wellhead is increased, the first one-way valve is opened at the moment, oil pumped by an oil pipe in an oil production well and discharged casing gas can be smoothly conveyed in an oil collecting pipeline, the pressure of the oil pipeline at the wellhead is increased, the second one-way valve is in a closed state, the casing gas in the casing pipe cannot be discharged at the moment, and the casing gas discharged into the first tubular body 5 and the oil are conveyed to a downstream station together for treatment, so that the purposes of recovering the casing gas and protecting the environment are achieved.

As shown in fig. 1, in an adjustable constant pressure backflow prevention type sleeve air recovery device of the present invention, a first check valve includes a first ball seat 11, a first ball sleeve 12, a first sealing ball 16, and a first ball rod 14. Wherein: the first ball seat 11 is arranged at the outlet end of the first tubular body 17; the first ball housing 12 is disposed at an outlet end of the first ball seat 11; a first sealing ball 16 is provided at an outlet end of the first ball seat 11; one end of the first ball arm 14 is connected to the first sealed sphere 16, and the other end of the first ball arm 14 extends out of the first ball sleeve 12.

The first sealing ball 16 moves away from or close to the first ball seat 11 under the action of the pressure at the well head and the back pressure in the oil collecting pipeline and the elastic force and the pressure of the first compression spring 15, so as to realize the closing or opening of the first one-way valve.

As shown in fig. 1, in the adjustable constant pressure backflow prevention type sleeve air recovery device of the present invention, a first compression spring 15 is disposed on a first ball rod 14, and the first compression spring 15 is located between a first sealing ball 16 and a first ball sleeve 12.

When oil is normally conveyed, the first compression spring 15 is compressed and contracted, and the first check valve is opened; when the sleeve gas in the sleeve is discharged, the first sealing ball 16 can be blocked at the outlet end of the first ball seat 11 under the combined action of the back pressure in the oil collecting pipeline and the elastic force of the first compression spring 15, so that the stable opening and closing are realized.

As shown in fig. 1, in the adjustable constant-pressure backflow-preventing type sleeve air recovery device of the present invention, the second check valve includes a second ball seat 8, a second ball sleeve 18, a second sealing ball 7 and a second ball rod 4. Wherein: the second ball seat 8 is arranged at the outlet end of the connecting body 10; a second ball sleeve 18 is arranged at the outlet end of the second ball seat 8; a second sealing ball 7 is provided at an outlet end of the second ball seat 8; one end of the second ball rod 4 is connected with the second sealed ball 8, and the other end of the second ball rod 4 extends out of the second ball sleeve 18.

The second sealing ball 7 is moved away from or towards the second ball seat 8 by the action of the gas jacket pressure and the oil pressure in the oil line, thereby effecting the closing or opening of the second non return valve.

As shown in fig. 1, in the adjustable constant-pressure backflow-preventing type sleeve air recovery device of the present invention, a second compression spring 6 is disposed on the second club 4, and the second compression spring 6 is located between the second sealing ball 7 and the second ball sleeve 18.

When sleeve gas in the sleeve is exhausted, the second compression spring 6 is compressed and contracted, and the second one-way valve is opened; when the sleeve gas in the sleeve is not discharged, the second sealing ball body 7 can be blocked at the outlet end of the second ball seat 8 under the action of the elastic force of the second compression spring 6 and the set pressure, so that the stable opening and closing are realized.

As shown in fig. 1, in an adjustable constant-pressure backflow-preventing type sleeve gas recovery device of the present invention, a pressure adjusting mechanism comprises an adjusting nut 1, a piston 2 and a third compression spring 3. Wherein: the adjusting nut 1 is screwed on the other end of the second tubular body 5; the piston 2 is arranged inside the second tubular body 5 and the piston 2 is connected with the part of the adjusting nut 1 that extends into the second tubular body 5; one end of the third compression spring 3 is connected with the piston 2, and the other end is connected with the second ball rod 4.

Through the position of the threaded assembly of the control adjusting nut 1 on the second tubular body 5, the elastic shrinkage of the third compression spring 3 can be realized, reasonable sleeve pressure is set, the pressure in the sleeve reaches and exceeds the set pressure to push the second sealing ball body 7 open to discharge sleeve gas, the purpose that the second sealing ball body 7 is closed is smaller than or equal to the set pressure, the sleeve gas pressure in the sleeve is ensured to be stabilized on the reasonably set pressure value, the separation of oil gas at the inlet of an oil well pump is avoided, the oil gas directly enters the flow along with the pumping oil flow to be recycled, and the sleeve gas recycling effect is improved.

As shown in fig. 1, in the adjustable constant-pressure backflow-preventing type sleeve gas recovery device of the present invention, an outer cylinder 13 is disposed outside an outlet end of the first tubular body 17, and the outer cylinder 13 is used for connecting the first tubular body 17 into an oil collecting pipeline.

As shown in fig. 1, in the adjustable constant-pressure backflow-preventing type casing gas recovery device of the present invention, a pressure gauge 9 is disposed on a side portion of a connecting body 10, and the specific condition of the pressure in the casing can be obtained through the pressure gauge 9, so as to know the working condition of the production well.

As shown in fig. 1, in the adjustable constant pressure backflow prevention type casing gas recovery device of the present invention, sealing rings 19 are disposed between the first ball seat 11 and the first tubular body 17, between the first tubular body 17 and the outer cylinder 13, between the piston 2 and the second tubular body 5, between the second ball seat 8 and the connecting body 10, and between the connecting body 10 and the second tubular body 5, so as to prevent leakage of oil or casing gas.

As shown in FIG. 1, in the adjustable constant pressure backflow prevention type casing gas recovery device of the present invention, the first ball seat 11 is provided with a tapered surface near the first sealing ball 16, and the second ball seat 8 is provided with a tapered surface near the second sealing ball 7.

The first sealing ball body 16 and the second sealing ball body 7 are contacted with the corresponding conical surfaces and can be tightly attached together, so that a good sealing effect is formed.

In conclusion, the adjustable constant-pressure backflow-preventing casing gas recovery device can be used as a common pressure valve, and has the effects of effectively controlling reasonable casing pressure, reducing gas-liquid separation at the bottom of an oil pumping well and improving casing gas recovery effect. In addition, the adjustable constant-pressure backflow-preventing type casing gas recovery device can block the back pressure of a well group, prevent oil from flowing backwards, reduce the pressure threshold of casing gas recovery, and convey the casing gas and the oil in the casing pipe to an oil collecting pipeline together, so that the casing gas and the oil reach a downstream station for centralized treatment. In addition, the adjustable constant-pressure backflow-preventing type sleeve gas recovery device is simple in overall structure, easy to manufacture, convenient to install and good in market popularization and use prospect.

While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.