1. A composite material marine riser-free drill string vibration test device for coupling drilling fluid circulation comprises a drill string model, load excitation equipment, a drilling fluid circulating device and a data monitoring and sensing device, wherein the drill string model, the load excitation equipment, the drilling fluid circulating device and the data monitoring and sensing device are placed in a wave current combined water tank, and the composite material marine riser-free drill string vibration test device is characterized in that: the load excitation equipment is connected to the top end of a drill column without a marine riser, a drill column model and a drilling fluid circulating device are connected with a data monitoring and sensing device, the drilling fluid circulating device is connected with the drill column model through a telescopic sleeve, the drill column model is embedded into a rotary bearing through a universal joint connected to the bottom of the drill column model, and the drill column model is connected to a fixing plate at the bottom of the supporting device through a high-strength bolt and a nut.

2. The composite riser-free drill string vibration testing apparatus coupled with drilling fluid circulation of claim 1, wherein: the load excitation equipment comprises a stepping speed regulating motor, an electric hydraulic device and a force application winch; the rotating end of the stepping speed regulating motor is connected to the drill column model, and the rotating speed is displayed and accurately regulated; the fixed end of the stepping speed regulating motor is connected with an electro-hydraulic device which performs axial excitation on the drill column model; and a data monitoring and sensing device is arranged between the electro-hydraulic device and the force application winch.

3. The composite marine riser-free drill string vibration testing apparatus of any of claims 1 or 2, wherein: the data monitoring sensing device comprises a fiber bragg grating strain sensor, a fiber optic slip ring, a fiber bragg grating demodulator, a workstation, a three-way force sensor and a load amplifier, wherein the top end of the three-way force sensor is connected with a steel wire rope, the steel wire rope passes through a fixed plate and bypasses a fixed pulley and is wound on a force application winch, the upper end of the electric hydraulic device is connected with the three-way force sensor, and the load amplifier is connected with the workstation to realize real-time accurate measurement of transverse, downstream and axial forces; one end of the fiber grating demodulator is connected with the fiber grating sensor, the other end of the fiber grating demodulator is connected with the workstation, the fiber slip ring is placed at the junction of the rotating end and the fixed end of the stepping speed regulating motor, and strain and displacement data transmission from the rotating end to the fixed end of the test system is realized through the fiber slip ring.

4. The composite riser-free drill string vibration testing apparatus coupled with drilling fluid circulation of claim 1, wherein: the drilling fluid circulating device comprises a drill column model, wherein the bottom end of the drill column model is embedded into a rotary bearing through a universal joint to be connected and fixed, and the rotary bearing is fixedly connected with a fixing plate; the drill column model is connected with the drilling fluid circulating hose through a telescopic sleeve, the top end and the bottom end of the drilling fluid circulating hose are respectively connected with sealing sleeves which are symmetrically arranged, and universal joints are arranged at one ends of the sealing sleeves; one end of the universal joint is provided with a sealing sleeve which is sleeved in a ball sealing ring, the drill string model is rotated and the sealing sleeve is fixed according to the ball sealing ring, and drilling fluid is sealed in the sealing sleeve; near the bottom end sealing sleeve, a wear-resistant mixed transportation pump, a valve, a densimeter and a flowmeter are installed on the drilling fluid circulating hose, the flow lifting and flow control of the drilling fluid are realized through the wear-resistant mixed transportation pump and the valve, and the flow and the density of the drilling fluid are accurately controlled by the densimeter and the flowmeter, so that the mixed transportation of gas, liquid and solid phases is realized.

5. The composite marine riser-free drill string vibration testing apparatus of any of claims 1 or 4, wherein: the telescopic sleeve is provided with a graduated scale, and the drilling string model is connected with the drilling fluid circulating hose through the sealing sleeve and the telescopic sleeve, so that the distance between the drilling fluid circulating hose and the drilling string model can be accurately adjusted.

6. The composite riser-free drill string vibration testing apparatus of claim 4, wherein the apparatus further comprises: the drill column model and the drilling fluid circulating hose are both made of composite materials.

7. The composite marine riser-free drill string vibration testing apparatus of any of claims 1 or 4, wherein: the drill column model is connected to the upper end of the universal joint at the bottom end of the drill column without the marine riser, the lower end of the universal joint is externally provided with the sealing sleeve, the bottom of the universal joint is embedded into the rotary bearing, and the universal joint can guarantee the drill column model to freely vibrate in a rotating mode in a transverse direction and a downstream direction and can achieve the test target of internal drilling fluid circulation.

8. The composite marine riser-free drill string vibration testing apparatus of any of claims 1, 4 or 5, wherein: the inner part of the telescopic sleeve adopts a variable cross-section design, so that internal flow buffering is realized.

Background

The existing marine riser is used for connecting a bottom blowout preventer and a top drilling device, a drilling tool and a casing pipe are led into the marine riser to form a slurry circulation channel, and the marine riser bears complex and severe environmental loads such as waves, ocean currents, earthquakes and the like on the outside, so that the marine riser is weak, easy to damage and high in cost. In addition, with the increase of water depth, the conventional drilling riser system is increasingly huge, the requirements on the bearing capacity of a drilling platform and an anchoring system are increasingly strict, meanwhile, the problems of too narrow formation pressure window, increased drilling fluid consumption, harsher drilling equipment bearing, overlarge casing pipe consumption and the like are also increasingly prominent, and a plurality of factors limit deepwater drilling so as to increase project risk and technical cost.

The drilling without the marine riser is a novel drilling technology, a drill column is exposed in seawater, the load of the floating drilling device is greatly reduced, the drilling cost is effectively reduced, and the difficult problem of drilling under the complicated seabed condition can be solved. In offshore oil and gas drilling operations, vortex-induced vibration presents problems for scientific drilling riser-less drilling operations and for the initial stages of all drilling operations involving oil and gas exploration. When the vortex-induced vibration frequency is close to the natural frequency of the riser, a 'locking' resonance phenomenon occurs, so that the amplitude is enhanced, the fatigue failure is accelerated, the pipeline is cracked and leaked, huge economic loss is caused, and serious marine pollution and secondary disasters are caused. Especially in riser-less drilling, where the drill string is lowered and directly exposed to the environment, the vortex induced vibration of the drill string also results in increased amplitude and reduced fatigue life. In addition, the drill string dynamic response test containing drilling fluid circulation and the drill string vibration suppression without the marine riser are blank for research.

Therefore, a composite material marine riser-free drill column vibration testing device for coupling drilling fluid circulation is urgently to be developed, drill column dynamic characteristic analysis under a marine riser-free drilling working condition is carried out, mechanical behavior of the drill column during marine riser-free drilling operation is researched, drill column dynamic response change under different working rotating speeds is researched, stress and deformation rules of the drill column under the effects of environmental load, drilling platform movement and the like are analyzed, fatigue damage of the drill column at a seawater section under the coupling vortex-induced vibration effect is calculated, and safety and reliability of the drilling operation are guaranteed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, is different from a common vortex-induced vibration test device, provides a composite material marine riser-free drill column vibration test device for coupling drilling fluid circulation, and provides technical support for optimization of a marine riser-free drilling technology drill column, strength check, operation parameters and drilling parameters; and an experimental platform and a testing method are provided for drilling fluid circulation hydromechanics and riser-free drill string vortex-induced vibration analysis.

The device aims to effectively simulate the mechanical characteristics such as stress, deformation and the like in the drilling process of the deep-sea non-riser drill string. The problem of drill string rotation is solved, the connection and fixation of the rotary drill string model 1, the non-rotary fixing device and the sensing equipment are realized, and the problems of data acquisition and power measurement can be solved. In addition, according to the invention, the telescopic sleeve between the sealing sleeve and the drilling fluid circulating hose not only provides a drilling fluid circulating channel, but also can adjust the distance between the drilling fluid circulating hose and the drill string, and effectively explores the interference and inhibition interval between the drill string model 1 and the drilling fluid circulating hose.

In order to solve the technical problems, the invention provides the following technical scheme:

coupled drilling fluid endless combined material does not have marine riser drilling string vibration test device, including placing drill string model 1 in wave current joint basin, load excitation equipment, drilling fluid circulating device, data monitoring sensing device, load excitation equipment is connected in no marine riser drill string top, drill string model 1 and drilling fluid circulating device are connected with data monitoring sensing device, drilling fluid circulating device passes through telescopic tube 11 and is connected with drill string model 1, drill string model 1 is through in the universal joint 2 embedding swivel bearing 12 of 1 bottom connection of drill string model, and on connecting the fixed plate through high-strength bolt and nut 14, the fixed plate is fixed in strutting arrangement 27 bottom.

Preferably, the load excitation device comprises a stepping speed regulating motor 15, an electro-hydraulic device 16 and a force application winch 20; the rotating end of the stepping speed regulating motor 15 is connected to the drill string model 1, and the rotating speed is displayed and accurately regulated; the fixed end of the stepping speed regulating motor 15 is connected with an electro-hydraulic device 16, and the electro-hydraulic device 16 performs axial excitation on the drill string model 1; a data monitoring and sensing device is arranged between the electro-hydraulic device 16 and the force application winch 20.

Preferably, the data monitoring and sensing device comprises a fiber bragg grating strain sensor 21, a fiber slip ring 22, a fiber bragg grating demodulator 24, a workstation 25, a three-way force sensor 17 and a load amplifier 26, wherein a measuring point 23 is arranged on an optical fiber of the fiber bragg grating strain sensor 21, the fiber bragg grating strain sensor 21 is connected to the fiber slip ring 22, the fiber slip ring 22 is placed at the junction of the rotating end and the fixed end of the stepping speed regulating motor 15, and the transmission of strain and displacement data from the rotating end to the fixed end of the test system is realized through the fiber slip ring; the upper end of the electro-hydraulic device 16 is connected with the three-way force sensor 17, the electro-hydraulic device is connected with the workstation 25 through the load amplifier 26, accurate measurement of transverse, downstream and axial force is achieved, the top end of the three-way force sensor 17 is connected with the steel wire rope 18, the steel wire rope 18 penetrates through the fixing plate 28 and bypasses the fixed pulley 19 to be wound on the force application winch 20, and therefore tension force can be provided for the whole drill string model 1 testing system.

Preferably, the drilling fluid circulating device comprises a drill string model 1, wherein the bottom end of the drill string model 1 is embedded into a rotary bearing 12 through a universal joint 2 to be connected and fixed, and the rotary bearing 12 is fixedly connected with a fixing plate 28 by adopting a high-strength bolt and a nut 14; the drill string model 1 is connected with a drilling fluid circulating hose 5 through a telescopic sleeve 11, the top end and the bottom end of the drilling fluid circulating hose 5 are respectively connected with a sealing sleeve 3 which is symmetrically arranged, and the universal joints 2 are arranged at one end of the sealing sleeve 3; 4 openings and jackscrews 13 in the corresponding 4 openings are arranged on the universal joint 2, and the drill string model 1 is tightly fixed; one end of the universal joint 2 is provided with a sealing sleeve 3 which is sleeved in a ball sealing ring 4, the drill string model 1 rotates and the sealing sleeve 3 is fixed according to the ball sealing ring 4, and drilling fluid 10 is sealed in the sealing sleeve 3; near the bottom end sealing sleeve 3, a wear-resistant mixed conveying pump 8, a valve 9, a densimeter 6 and a flowmeter 7 are installed on the drilling fluid circulating hose 5, the flow of the drilling fluid 10 is lifted and flow control is realized through the wear-resistant mixed conveying pump 8 and the valve 9, and the flow and the density of the drilling fluid are accurately controlled by the densimeter 6 and the flowmeter 7, so that gas, liquid and solid multi-phase mixed conveying is realized.

Preferably, the telescopic sleeve 11 is provided with a graduated scale 29, and the drilling string model and the drilling fluid circulation hose are connected through a sealing sleeve and the telescopic sleeve, so that the distance between the drilling fluid circulation hose and the drilling string model can be accurately adjusted.

Preferably, the drill string model 1 and the drilling fluid circulating hose are both made of composite materials, so that the mechanical properties of the structure under the action of internal and external flows and working load are guaranteed.

Preferably, at the drill string bottom, the drill string model 1 is connected to the universal joint upper end, and the similar external sealing sleeve in upper portion is with the lower extreme, and the difference is that the bottom embedding slewing bearing is inside, and this universal joint can guarantee that drill string model 1 rotates, horizontal, following current to free vibration to can reach the experimental target of inside drilling fluid circulation.

Preferably, the drill string model 1 and the drilling fluid circulation hose are connected through a sealing sleeve and a telescopic sleeve, so that the distance between the drilling fluid circulation hose and the drill string model 1 is adjusted, and the wake flow interference and vibration suppression interval of the drill string model 1 is effectively explored.

Preferably, the inner part of the telescopic sleeve adopts a variable cross section design, the water hammer phenomenon has great influence on the current coupled internal flow vortex-induced vibration test data, and the variable cross section design adopted by the invention can play a role in buffering so as to enhance the stability of the internal flow at the joint.

Preferably, the drill string model 1 and the drilling fluid circulation hose 5 are both made of composite materials.

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

1. the invention can realize the rotation of the drill stem under the action of wave current, can effectively simulate the load of working conditions, aims to realize the test of the dynamic response of the drill stem under the action of different water flow velocities, wave heights, different rotating speeds and axial excitation in the wave current combined water tank, can effectively simulate the influence of drilling fluids with different types, densities and flows and the circulation thereof on the dynamic response of the drill stem, and reduces the influence of the internal flow on the impact action of the inner wall of the drill stem. 2. The problem of drill string vortex-induced vibration simulation test caused by the effect of external wave flow coupling internal drilling fluid is solved while the drill string model 1 is ensured to rotate. 3. The device such as the sealing sleeve and the pressure mixing pump can effectively simulate the suction module of the drilling without the marine riser, and the storage and circulation of the drilling fluid in the drill column model 1 and the drilling fluid circulation hose 5 are realized. 4. The variable cross-section design of the inner parts of the telescopic sleeves of the drill column model 1 and the drilling fluid recovery hose can effectively prevent water hammer, and can strengthen the stability of water flow action at the joint. 5. The distance between different drill string models 1 and the drilling fluid circulating hose can be realized through telescopic conversion of the telescopic sleeves 11 of the drill string models 1 and the drilling fluid circulating hose 5, and the interference effect and the vibration suppression interval between the drill string models 1 and the drilling fluid circulating hose are effectively explored. 6. The data monitoring and sensing system effectively realizes dynamic response acquisition and can realize dynamic response test and accurate measurement of strain, displacement, three-way force and acceleration of a drill string under the action of changing rotating speed, axial load, phase state, density and flow rate of drilling fluid.

Drawings

FIG. 1 is a schematic structural view of a composite marine riser-free drill string vibration test apparatus of the present invention coupled with drilling fluid circulation;

FIG. 2 is a schematic view of a drill string model top portion of a composite marine riser-free drill string vibration test apparatus of the present invention coupled with drilling fluid circulation;

FIG. 3 is a schematic cross-sectional view of a drill string model and a drilling fluid circulation hose of the composite marine riser-free drill string vibration testing apparatus of the present invention coupled with drilling fluid circulation;

FIG. 4 is a flow chart of a dynamic response test of the composite marine riser-free drill string vibration test apparatus of the present invention coupled with drilling fluid circulation;

in the figure, 1 is a drill string model, and 2 is a universal joint; 3-a sealing sleeve, 4-a ball seal ring, 5-a drilling fluid circulating hose, 6-a densimeter, 7-a flowmeter, 8-a wear-resistant mixing and transportation pump, 9-a valve, 10-a multiphase drilling fluid, 11-a telescopic sleeve, 12-a rotary bearing, 13-an opening and a jackscrew, 14-a high-strength bolt and a nut, 15-a stepping speed regulating motor, 16-an electro-hydraulic device, 17-a three-way force sensor, 18-a steel wire rope, 19-a fixed pulley, 20-a force application winch, 21-a fiber grating strain sensor, 22-a fiber slip ring, 23-a measuring point, 24-a fiber grating demodulator, 25-a workstation, 26-a load amplifier, 27-a supporting device, 28-a fixed plate, 29-a graduated scale and 30-a cross beam.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

As shown in fig. 1-3, a vibration test device for a composite material marine riser-free drill string coupled with drilling fluid circulation comprises a drill string model 1 placed in a wave-current combined water tank, load excitation equipment, a drilling fluid circulation device and a data monitoring and sensing device, wherein the load excitation equipment is connected to the top end of the marine riser-free drill string, the drill string model 1 and the drilling fluid circulation device are connected with the data monitoring and sensing device, the drilling fluid circulation device is connected with the drill string model 1 through a telescopic sleeve 11, the drill string model 1 is embedded into a rotary bearing through a universal joint 2 connected to the bottom of the drill string model 1 and is connected onto a fixing plate through a high-strength bolt and a nut 14, and the fixing plate 28 is fixed to the bottom of a supporting device 27. The supporting device 27 is reinforced by the cross beam 30 and can be fixed on the side wall of the wave flume to enhance the stability of the whole testing device.

Preferably, the load excitation equipment applies rotating speed and axial force work load excitation to the drill string model 1, and the pumping, measurement, recovery and circulation of the drilling fluid are realized through a mixing transmission pump, a flowmeter, a densimeter, a sealing sleeve, a universal joint and a composite material flexible hose; the measurement of the dynamic response of the drill string and the data monitoring are realized through the fiber bragg grating strain sensor 21, the fiber optic slip ring 22 and the three-way force sensor 17. The drill string model 1 is externally connected with a drilling fluid circulating hose 5, so that a vibration response test of the drill string model 1 under the action of external wave flow and internal drilling fluid 10 is realized. The load excitation equipment comprises a stepping speed regulating motor 15, an electric hydraulic device 16 and a force application winch 20; the rotating end of the stepping speed regulating motor 15 is connected to the drill string model 1, and the rotating speed is displayed and accurately regulated; the fixed end of the stepping speed regulating motor 15 is connected with an electro-hydraulic device 16, and the electro-hydraulic device 16 performs axial excitation on the drill string model 1; a data monitoring and sensing device is arranged between the electro-hydraulic device 16 and the force application winch 20.

Preferably, the data monitoring sensing device comprises a fiber bragg grating strain sensor 21, a fiber slip ring 22, a fiber bragg grating demodulator 24, a workstation 25, a three-way force sensor 17 and a load amplifier 26 which are arranged on the surface of the drill string, wherein a measuring point 23 is arranged on an optical fiber of the fiber bragg grating strain sensor 21, the fiber bragg grating strain sensor 21 is connected to the fiber slip ring 22, the fiber slip ring 22 is placed at the junction of the rotating end and the fixed end of the stepping speed regulating motor 15, and data transmission such as strain, displacement and the like from the rotating end to the fixed end of the test system is realized through the fiber slip ring; the upper end of the electro-hydraulic device 16 is connected with the three-way force sensor 17, the electro-hydraulic device is connected with the workstation 25 through the load amplifier 26, accurate measurement of transverse, downstream and axial force is achieved, the top end of the three-way force sensor 17 is connected with the steel wire rope 18, the steel wire rope 18 penetrates through the fixing plate 28 and bypasses the fixed pulley 19 to be wound on the force application winch 20, and therefore tension force can be provided for the whole drill string model 1 testing system. The fiber grating strain sensor 21 is strong in magnetic interference resistance, the three-way force sensor 17 can realize accurate measurement of force, stress and deformation of the structure are accurately captured, and the fiber grating strain sensor has strong advantages and adaptability.

As shown in fig. 3, the drilling fluid circulation device comprises a drill string model 1, wherein the bottom end of the drill string model 1 is embedded into a rotary bearing 12 through a universal joint 2 to be connected and fixed, so that the drill string model 1 can rotate, and drill string vortex-induced vibration under the action of outer flow coupling and inner flow is realized. The rotary bearing 12 is fixedly connected with a fixing plate 28 by adopting a high-strength bolt and a nut 14; the drill string model 1 is connected with a drilling fluid circulating hose 5 through a telescopic sleeve 11 by a pipeline, the top end and the bottom end of the drilling fluid circulating hose 5 are respectively connected with a sealing sleeve 3 which is symmetrically arranged, and the universal joints 2 are both arranged at one end of the sealing sleeve 3; the drill string model 1 is connected with the drilling fluid circulating hose 5 through the sealing sleeve 3 and the telescopic sleeve 11, so that the distance between the drilling fluid circulating hose 5 and the drill string model 1 is adjusted, and the wake flow interference and vibration suppression interval of the drill string model 1 is effectively explored. The universal joint 2 is provided with 4 holes and jackscrews 13 in the corresponding 4 holes, so that the drill string model 1 can be tightly fixed, and no relative displacement exists between the universal joint 2 and the drill string model 1. One end of the universal joint 2 is provided with a sealing sleeve 3 which is sleeved in a ball sealing ring 4, the drill string model 1 rotates and the sealing sleeve 3 is fixed according to the ball sealing ring 4, and drilling fluid 10 is sealed in the sealing sleeve 3; near bottom sealing sleeve 3, installation wear-resisting defeated pump 8, valve 9, densimeter 6 and flowmeter 7 are mixed on drilling fluid circulation hose 5, realize drilling fluid 10 flow promotion and flow control through wear-resisting defeated pump 8 and valve 9 that mix, and densimeter 6 and flowmeter 7 carry out accurate the accuse to drilling fluid flow and density, and this drilling fluid circulation system can realize gas, liquid, solid heterogeneous and mix defeated, satisfies different grade type, discharge capacity, density drilling fluid 10 operating mode. The drilling fluid circulating device can be accurately positioned according to working condition requirements, not only can realize the circulation of the drilling fluid 10, but also can carry out wake flow interference and vibration control on the drill column model 1 according to the control rod principle.

The telescopic sleeve 11 is provided with a graduated scale 29, the drill string model 1 is connected with the drilling fluid circulating hose 5 through the sealing sleeve 3 and the telescopic sleeve 11, and the distance between the drilling fluid circulating hose 5 and the drill string model 1 is accurately adjusted. Because the water hammer phenomenon has great influence on the current coupled internal flow vortex-induced vibration test data, the inner part of the telescopic sleeve 11 adopts the variable cross section design, and the invention adopts the variable cross section design to play a buffering role so as to enhance the stability of the internal flow at the joint. The water hammer can be effectively prevented, the stability of the water flow action at the joint can be enhanced, and the problem of internal flow interference is solved.

Preferably, at the drilling string bottom, the drilling string model 1 is connected to the universal joint upper end, and external sealing sleeve 3 of lower extreme, in the universal joint 2 bottom embedding swivel bearing, this universal joint can guarantee that drilling string model 1 rotates, horizontal, following current to free vibration, reaches the experimental target of inside drilling fluid circulation.

As shown in fig. 4, the drill string model 1 and the drilling fluid circulation hose 5 are both made of composite materials, so as to ensure the mechanical properties of tensile strength, compression strength, bending strength, torsion resistance and the like of the structure under the action of internal and external flows and working loads. The drill string model 1, the load excitation equipment, the drilling fluid circulating device and the data monitoring and sensing system are connected to the fixing plate 28 through the high-strength bolt and the nut 14, the drill string model 1 and the drilling fluid recovery hose 5 are fixedly installed on the supporting device 27, and the composite material marine riser-free drill string dynamic response testing system containing the drilling fluid circulation is integrally placed in the wave-current combined water tank, so that the drill string dynamic response testing under the action of waves, water flows, the drilling fluid and external excitation can be realized, and the dynamic response of the drill string can be accurately measured.

The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be understood by those skilled in the art that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.