Bending joint device capable of being adjusted while drilling

Abstract

The invention relates to a while-drilling adjustable bent connector device which comprises an upper shell, a liquid storage device, a driving device and a liquid conveying pipeline are arranged in the upper shell, and the driving device is connected with the liquid storage device; the piston part is arranged in the upper shell in a manner of moving up and down, a piston cavity is formed between the outer wall of the piston part and the inner wall of the upper shell, and the piston cavity is connected with the liquid storage device through a liquid conveying pipeline; the bending assembly comprises a ball sleeve and a ball head, the ball sleeve is arranged in the upper shell, a second spherical surface on the upper portion of the ball head is rotatably embedded in a first spherical surface on the inner wall of the lower portion of the ball sleeve, and one side of the piston piece abuts against one side of the top of the ball head; and the lower part of the ball head extends to the lower part of the upper shell and is connected with the lower shell, so that the lower shell and the lower drilling tool connected with the lower shell are driven to turn through the ball head. According to the invention, the technical problems that the control accuracy of the existing underground bending connector is low and the requirement of underground accurate orientation cannot be met are solved.

Description

Technical Field

[0001] This invention relates to the field of oil drilling technology, and in particular to an adjustable bending joint device for drilling. Background Technology

[0002] To achieve efficient oil and gas resource development, on-site drilling operations urgently require an automated and intelligent drilling system. The combination of electric drive directional drilling technology and downhole electric motors facilitates automated closed-loop control of drilling parameters, providing precise and reliable power for drilling operations and accelerating and improving efficiency. Among these components, the electric drive adjustable bend joint is one of the key tools for implementing electric drive directional drilling technology.

[0003] Currently, while similar adjustable bend joint tools, such as controllable eccentric rotary guide tools, have been developed, most of these adjustable bend joint tools require changing the drilling fluid discharge rate on the surface to control the bending angle of the bottom hole bend joint. They cannot achieve electric control or real-time adjustment of the angle downhole, and therefore cannot meet the precise orientation requirements of downhole electric motor drilling systems.

[0004] There is currently no effective solution to the problem that downhole electric motor drilling systems have low control precision for existing downhole bending joints, which makes it impossible to meet the requirements for precise downhole orientation.

[0005] Therefore, based on years of experience and practice in related industries, the inventor proposes an adjustable bending joint device for drilling to overcome the shortcomings of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to provide an adjustable bending joint device that can achieve stepless adjustment and self-locking of the bending angle, greatly improving reliability and bending control accuracy, and meeting the high torque, electronically controlled, and precise orientation requirements of downhole electric motor drilling systems.

[0007] The objective of this invention can be achieved through the following methods:

[0008] This invention provides a drilling-adjustable bend joint device, the drilling-adjustable bend joint device comprising:

[0009] The upper housing contains a liquid storage device, a driving device, and a liquid delivery pipeline, and the driving device is connected to the liquid storage device.

[0010] A piston assembly is disposed vertically within the upper housing, and a piston cavity is formed between the outer wall of the piston assembly and the inner wall of the upper housing. The piston cavity is connected to the liquid storage device through the infusion pipeline. The driving device can drive the liquid in the liquid storage device to flow between the liquid storage device and the piston cavity, so as to drive the piston assembly to move vertically.

[0011] A bending assembly includes a cylindrical ball sleeve and a cylindrical ball head. The ball sleeve is disposed inside the upper housing, and the lower inner wall of the ball sleeve forms a concave first spherical surface. The upper outer surface of the ball head forms a convex second spherical surface, which is rotatably embedded in the first spherical surface. One side of the piston has a downwardly extending protrusion, the bottom of which abuts against one side of the top of the ball head.

[0012] The lower housing is located below the upper housing. The bottom of the lower housing is used to connect to the lower drill bit. The lower part of the ball head extends to the bottom of the upper housing and is connected to the lower housing, so that the lower housing and the lower drill bit can bend to a preset angle through the ball head.

[0013] In a preferred embodiment of the present invention, a first accommodating cavity and a second accommodating cavity are formed in the upper housing, and the driving device and the liquid storage device are respectively disposed in the first accommodating cavity and the second accommodating cavity;

[0014] The driving device includes a driving part and an electrical connection part. The signal output terminal of the electrical connection part is electrically connected to the signal receiving terminal of the driving part. The electrical connection part is electrically connected to the controller via a cable.

[0015] In a preferred embodiment of the present invention, the drive portion includes an electro-hydraulic pump, and the electrical connection portion includes a cable connector electrically connected to the electro-hydraulic pump.

[0016] And / or, the liquid storage device is a capsule housing containing hydraulic fluid.

[0017] In a preferred embodiment of the present invention, an annular sealing boss is formed on the outer wall of the piston component along its circumference. The outer wall surface of the sealing boss is slidably and sealingly connected to the inner wall of the upper housing. The sealing boss can divide the piston cavity into an upper chamber located above the sealing boss and a lower chamber located below the sealing boss.

[0018] The upper chamber and the lower chamber are respectively connected to the liquid storage device through the infusion pipeline. The infusion pipeline located between the upper chamber and the liquid storage device is equipped with a first valve, and the infusion pipeline located between the lower chamber and the liquid storage device is equipped with a second valve.

[0019] In a preferred embodiment of the present invention, a third accommodating cavity is formed inside the upper housing, and a pressure sensor is disposed in the third accommodating cavity. The signal detection end of the pressure sensor is connected to the infusion pipeline, and the signal output end of the pressure sensor is electrically connected to the controller through the cable.

[0020] In a preferred embodiment of the present invention, the bending assembly further includes a fastening sleeve and a fastening ring. The fastening sleeve is connected to the bottom of the upper housing, and an annular limiting boss is formed on the bottom inner wall of the fastening sleeve. The fastening ring is located inside the fastening sleeve and connected to the limiting boss. When the ball head is fitted with the ball sleeve, the bottom outer wall of the ball head rotates and abuts against the inner wall of the fastening ring to vertically limit the ball head. The ball head, ball sleeve, fastening sleeve and fastening ring cooperate to form a spherical hinge structure.

[0021] In a preferred embodiment of the present invention, the fastening sleeve is provided with a strip-shaped hole extending along its axial direction, and a plurality of the strip-shaped holes are distributed circumferentially around the fastening sleeve. A plurality of torque transmission pins are provided circumferentially around the outer wall of the ball head, and the plurality of torque transmission pins are rotatably embedded in the corresponding strip-shaped hole along the radial direction of the fastening sleeve.

[0022] In a preferred embodiment of the present invention, the bottom surface of the protrusion is a downwardly protruding first arc-shaped surface, and one side of the top of the ball head has a downwardly recessed second arc-shaped surface. The first arc-shaped surface abuts against the second arc-shaped surface to form an arc-shaped contact surface between the protrusion and the ball head.

[0023] In a preferred embodiment of the present invention, the two opposite sides of the second arcuate surface are respectively provided with a first limiting boss, and the bottom of the piston member and respectively located below the first limiting boss are respectively provided with a second limiting boss. When the piston member moves upward, the top of the second limiting boss can abut against the bottom of the first limiting boss, and restore the ball head in the bent state to its original position.

[0024] In a preferred embodiment of the present invention

[0025] The interior of the upper housing, the interior of the piston, and the interior of the ball head form a through channel;

[0026] The adjustable bending joint device while drilling also includes a transmission assembly, which includes a first universal joint, a spline shaft, and a second universal joint arranged sequentially from top to bottom in the channel. The first universal joint and the second universal joint are respectively connected to the top and bottom ends of the spline shaft. The first universal joint is used to connect to the power output shaft of the upper drill bit, and the second universal joint is connected to the lower housing.

[0027] In a preferred embodiment of the present invention, a lower connector is provided at the bottom of the lower housing, through which the lower drill bit is connected.

[0028] In a preferred embodiment of the present invention, the bottom of the lower housing is connected to the top of the lower connector, and PDC composite sheets are respectively provided on the bottom end face of the lower housing and the top end face of the lower connector to form a friction pair.

[0029] In a preferred embodiment of the present invention, the adjustable bending joint device while drilling further includes a mandrel, the top end of which is located in the channel and connected to the second universal joint, the lower part of which extends below the channel and at least a portion of which extends into the lower joint, and the portion of which extends below the channel is connected to the lower housing and the lower joint respectively.

[0030] Based on the above, the features and advantages of the adjustable bending joint device for drilling of the present invention are as follows:

[0031] The upper housing houses a liquid storage device, a drive device, and a liquid delivery pipeline. A piston capable of vertical movement is also housed within the upper housing, forming a piston cavity between the outer wall of the piston and the inner wall of the upper housing. This piston cavity is connected to the liquid storage device via the liquid delivery pipeline. The drive device facilitates the flow of liquid within the liquid storage device between the storage device and the piston cavity, thereby driving the piston to move vertically. Inside the upper housing, a ball sleeve and a ball head are also provided, rotatably fitted together via a first spherical surface and a second spherical surface. The connection allows the ball head to rotate freely within the ball sleeve, while one side of the piston has a downwardly extending protrusion. The bottom of this protrusion abuts against one side of the top of the ball head. Thus, when the drive device moves the piston downward, the protrusion on the piston pushes downward against one side of the top of the ball head, causing the ball head to rotate relative to the ball sleeve. Since the ball head is connected to the lower housing below, the rotation of the ball head can drive the lower housing and the lower drill bit connected to the lower housing to bend, realizing real-time adjustment of the bending angle of the lower drill bit.

[0032] Since the rotation angle of the ball head (i.e. the rotation angle of the lower housing and the lower drill string) can be adjusted by the downward movement of the piston, the movement position of the piston can be precisely controlled by controlling the flow of liquid from the reservoir into the piston chamber through the drive device during actual operation. This achieves precise and stepless adjustment of the bending angle. At the same time, the bending angle can be self-locked when the liquid stops entering and leaving the piston chamber. This not only greatly improves the degree of automation, but also improves the reliability and bending control accuracy, which can meet the high torque, electronic control, and precise orientation requirements of downhole electric motor drilling systems. Attached Figure Description

[0033] The accompanying drawings are intended only to illustrate and explain the present invention and do not limit the scope of the invention.

[0034] in:

[0035] Figure 1 : This is a front cross-sectional view of the adjustable bending joint device for drilling according to the present invention.

[0036] Figure 2 :for Figure 1 A magnified view of the joint between the ball sleeve and the ball head.

[0037] Figure 3 :for Figure 1 Cross-sectional view at position AA.

[0038] Figure 4 This is a schematic diagram of the connection position between the ball head and the fastening sleeve in the adjustable bending joint device for drilling according to the present invention.

[0039] Figure 5 This is a schematic diagram of the connection position between the piston and the ball head in the adjustable bending joint device during drilling of the present invention.

[0040] The reference numerals in the accompanying drawings of this invention are:

[0041] 1. Upper shell; 101. Upper shell section;

[0042] 102. Piston outer casing section; 2. Lower casing;

[0043] 3. Piston components; 301. Piston chamber;

[0044] 302. Protrusion; 3021. First arc-shaped surface;

[0045] 3022, Second limiting boss; 303, Sealing boss;

[0046] 4. Liquid storage device; 5. Drive device;

[0047] 501. Drive section; 502. Electrical connection section;

[0048] 503. Pressure sensor; 6. Infusion tubing;

[0049] 7. Bending assembly; 701. Ball sleeve;

[0050] 702, Ball Head; 7021, Torque Pin;

[0051] 7022, Second arc-shaped surface; 7023, First limiting boss;

[0052] 703, Fastening sleeve; 7031, Strip hole;

[0053] 704, Fastening ring; 8, Transmission assembly;

[0054] 801. First universal joint; 802. Splined shaft;

[0055] 803. Second universal joint; 9. Spindle;

[0056] 10. Lower connector; 11. PDC composite sheet;

[0057] 12. Gap; 13. Curved contact surface;

[0058] 14. Connect the connector. Detailed Implementation

[0059] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0060] In this invention, terms such as "upper," "lower," "top," "bottom," and "vertical" that indicate direction are all used in this way. Figure 1 The directions "up," "down," "top," "bottom," and "vertical" shown are for illustrative purposes and are explained here together. This is intended to clearly and explicitly describe the connection structure and positional relationships between the components in the adjustable bending joint device for drilling of the present invention, rather than to limit specific directions.

[0061] like Figures 1 to 5 As shown, the present invention provides an adjustable bending joint device for drilling. The adjustable bending joint device for drilling includes: a vertically arranged cylindrical upper shell 1, the top of which is used to connect to an upper drilling tool (not shown) and is lowered into the well to a preset position with the upper drilling tool; a liquid storage device 4, a driving device 5 and a liquid delivery pipeline 6 are arranged inside the upper shell 1, and the driving device 5 is connected to the liquid storage device 4; a cylindrical piston 3 is arranged in the upper shell 1 and can move up and down, and a piston cavity 301 is formed between the outer wall of the piston 3 and the inner wall of the upper shell 1; the piston cavity 301 is connected to the liquid storage device 4 through the liquid delivery pipeline 6; the driving device 5 can drive the liquid in the liquid storage device 4 to flow between the liquid storage device 4 and the piston cavity 301, thereby changing the volume of the piston cavity 301 to achieve the purpose of driving the piston 3 to move up and down.

[0062] The adjustable bending joint device for drilling includes a bending assembly 7 and a lower housing 2. The bending assembly 7 includes a cylindrical ball sleeve 701 and a cylindrical ball head 702. The ball sleeve 701 is fixedly disposed inside the upper housing 1, and the lower inner wall of the ball sleeve 701 forms a concave first spherical surface. The upper outer surface of the ball head 702 forms a convex second spherical surface. The portion of the ball head 702 corresponding to the second spherical surface is located inside the ball sleeve 701, allowing the second spherical surface to be rotatably embedded in the first ball sleeve 701. Within the inner surface, one side of the piston component 3 has a downwardly extending protrusion 302, the bottom of which abuts against one side of the top of the ball head 702. The lower housing 2 is a vertically arranged cylindrical shape, located below the upper housing 1. The bottom of the lower housing 2 is used to connect to the lower drilling tool (not shown). The lower part of the ball head 702 extends below the upper housing 1 and connects to the lower housing 2, so that the lower housing 2 and the lower drilling tool can bend to a preset angle through the ball head 702. The preset angle can be adjusted by changing the rotation angle of the ball head 702 according to the actual bending requirements, as long as the bending angle requirements of the lower drilling tool are met during actual drilling. The specific bending angle is not limited here.

[0063] In this invention, a liquid storage device 4, a driving device 5, and a liquid delivery pipeline 6 are provided inside the upper housing 1. A piston 3 capable of vertical movement is also provided inside the upper housing 1, and a piston cavity 301 is formed between the outer wall of the piston 3 and the inner wall of the upper housing 1. The piston cavity 301 is connected to the liquid storage device 4 via the liquid delivery pipeline 6. The driving device 5 can drive the liquid in the liquid storage device 4 to flow between the liquid storage device 4 and the piston cavity 301, thereby driving the piston 3 to move vertically. Inside the upper housing 1, a ball sleeve 701 and a ball head 702 are also provided. The ball sleeve 701 and the ball head 702 are rotatably fitted together via a first spherical surface and a second spherical surface. The ball head 702 is connected to the ball sleeve 701, allowing it to rotate freely within the ball sleeve 701. The piston 3 has a downwardly extending protrusion 302 on one side, the bottom of which abuts against one side of the top of the ball head 702. Thus, when the drive device 5 drives the piston 3 to move downward, the protrusion 302 on the piston 3 pushes downward against one side of the top of the ball head 702, causing the ball head 702 to rotate relative to the ball sleeve 701. Since the ball head 702 is connected to the lower housing 2 below, the rotation of the ball head 702 can drive the lower housing 2 and the lower drill bit connected to the lower housing 2 to bend, realizing real-time adjustment of the bending angle of the lower drill bit.

[0064] In this invention, since the rotation angle of the ball head 702 (i.e., the rotation angle of the lower housing 2 and the lower drill string) can be adjusted by the downward movement of the piston 3, in actual operation, the movement position of the piston 3 can be precisely controlled by controlling the inflow of liquid from the storage device 4 into the piston chamber 301 through the drive device 5. This achieves precise and stepless adjustment of the bending angle. At the same time, when the liquid stops entering and leaving the piston chamber 301, the bending angle can be self-locked. This not only greatly improves the degree of automation, but also improves the reliability and bending control accuracy, and can meet the high torque, electronic control, and precise orientation requirements of downhole electric motor drilling systems.

[0065] In an optional embodiment of the present invention, such as Figure 1 , Figure 3 As shown, the upper housing 1 has a first accommodating cavity and a second accommodating cavity. The driving device 5 is disposed in the first accommodating cavity, and the liquid storage device 4 is disposed in the second accommodating cavity. The driving device 5 includes a driving part 501 and an electrical connection part 502. The signal output terminal of the electrical connection part 502 is electrically connected to the signal receiving terminal of the driving part 501. The electrical connection part 502 is electrically connected to an external controller via a cable. The controller sends a control signal and transmits it to the driving part 501 through the cable and the electrical connection part 502, thereby controlling the driving part 501 to perform actions to drive the liquid to flow between the liquid storage device 4 and the piston chamber 301. At the same time, the controller can also receive feedback signals from the driving device 5 to know the amount of liquid flowing into the piston chamber 301, thereby realizing the rotation angle of the ball head 702 to achieve the purpose of bending angle detection. Furthermore, the controller can compare the acquired data with preset data and control the driving device 5 based on the difference between the two, thereby adding liquid to or reducing the liquid in the piston chamber 301 to achieve the purpose of bending angle correction.

[0066] In one specific embodiment of the present invention, the drive part 501 includes an electro-hydraulic pump, and the electrical connection part 502 includes a cable connector electrically connected to the electro-hydraulic pump; the liquid storage device 4 is a capsule housing containing hydraulic oil, and the liquid flowing between the liquid storage device 4 and the piston chamber 301 is hydraulic oil.

[0067] In an optional embodiment of the present invention, such as Figure 1 , Figure 2 As shown, an annular sealing boss 303 is formed on the outer wall of the piston 3 along its circumference. The outer wall surface of the sealing boss 303 is slidably sealed to the inner wall of the upper housing 1. The sealing boss 303 can divide the piston cavity 301 into an upper chamber located above the sealing boss 303 (due to...). Figure 2 The middle piston 3 is already in the uppermost position, therefore, the upper chamber is not shown) and the lower chamber is located below the sealing boss 303. Figure 2(The location marked 301 in the middle); the upper chamber and the lower chamber are respectively connected to the liquid storage device 4 through the infusion pipeline 6. The infusion pipeline 6 located between the upper chamber and the liquid storage device 4 is equipped with a first valve, and the infusion pipeline 6 located between the lower chamber and the liquid storage device 4 is equipped with a second valve. Among them, the electro-hydraulic pump can rotate forward or reverse to control the piston 3 to move up or down in the upper housing 1.

[0068] Specifically, when the electro-hydraulic pump rotates forward, the first and second valves are simultaneously activated, allowing hydraulic oil in the capsule to enter the upper chamber, while hydraulic oil in the lower chamber flows back into the capsule, establishing a positive circulation in the hydraulic pipeline and pushing the piston 3 downward. When the electro-hydraulic pump rotates in reverse, hydraulic oil flows into the lower chamber in the opposite direction, establishing a reverse circulation in the hydraulic pipeline and pushing the piston 3 upward. When the electro-hydraulic pump stops working, the first and second valves are deactivated, the hydraulic pipeline is disconnected, the piston 3 stops moving, and the ball head 702 does not rotate, thus achieving self-locking of the bending angle.

[0069] Furthermore, such as Figure 3 As shown, a third accommodating cavity is formed within the upper housing 1. A pressure sensor 503 is installed within this third accommodating cavity. The signal detection terminal of the pressure sensor 503 is connected to the infusion pipeline 6, and the signal output terminal of the pressure sensor 503 is electrically connected to the controller via a cable. The pressure sensor 503 can detect the oil pressure within the infusion pipeline 6 in real time. If the oil pressure is abnormal (such as the actual oil pressure within the infusion pipeline 6 exceeding the preset oil pressure threshold range), the operator should be promptly alerted to stop the machine for inspection.

[0070] In an optional embodiment of the present invention, such as Figure 1 , Figure 2 As shown, the bending assembly 7 also includes a cylindrical fastening sleeve 703 and an annular fastening ring 704. The fastening sleeve 703 is fixedly connected to the bottom of the upper housing 1, and an annular limiting boss is formed on the inner wall of the bottom of the fastening sleeve 703 along its circumference. The fastening ring 704 is located inside the fastening sleeve 703 and is fixedly connected to the limiting boss. When the ball head 702 and the ball sleeve 701 are assembled, the outer wall of the bottom of the ball head 702 rotates and abuts against the inner wall of the fastening ring 704 to vertically limit the ball head 702. That is, through the cooperation of the fastening ring 704 and the ball sleeve 701, the ball head 702 can only rotate within the range limited by the ball sleeve 701 and the fastening ring 704, and cannot move vertically. The ball head 702, the ball sleeve 701, the fastening sleeve 703 and the fastening ring 704 cooperate to form a spherical hinge structure.

[0071] Furthermore, such as Figure 4As shown, the fastening sleeve 703 is provided with a strip-shaped hole 7031 extending along its axial direction. Multiple strip-shaped holes 7031 are spaced apart circumferentially on the fastening sleeve 703. Multiple torque-transmitting pins 7021 are spaced apart circumferentially on the outer wall of the ball head 702. These torque-transmitting pins 7021 are rotatably embedded in the corresponding strip-shaped holes 7031 along the radial direction of the fastening sleeve 703. Through the cooperation of the torque-transmitting pins 7021 and the strip-shaped holes 7031, the counter-torque generated during the bending process of the lower housing 2 can be transmitted to the fastening sleeve 703. Simultaneously, it ensures that the ball head 702 does not move relative to the axis of the fastening sleeve 703, thus ensuring the accuracy of the rotation angle of the ball head 702.

[0072] In an optional embodiment of the present invention, such as Figure 1 , Figure 2 , Figure 5 As shown, the bottom surface of the protrusion 302 of the piston 3 is a downwardly protruding first arc-shaped surface 3021, and one side of the top of the ball head 702 has a downwardly recessed second arc-shaped surface 7022. The first arc-shaped surface 3021 and the second arc-shaped surface 7022 abut against each other to form an arc-shaped contact surface 13 between the protrusion 302 and the ball head 702. Through the cooperation of the first arc-shaped surface 3021 and the second arc-shaped surface 7022, the protrusion 302 of the piston 3 and the ball head 702 have a fixed contact position. The piston 3 can accurately push the ball head 702 to the same position in each action, thereby improving the accuracy of bending.

[0073] Furthermore, such as Figure 5 As shown, the two opposite sides of the second arc-shaped surface 7022 each have a first limiting boss 7023, that is, the part where the ball head 702 abuts against the protrusion 302 of the piston 3 is in the shape of a "T". The bottom of the piston 3 and below the first limiting boss 7023 each have a second limiting boss 3022, thus forming two return hook structures. When the piston 3 moves upward, the top of the second limiting boss 3022 can abut against the bottom of the first limiting boss 7023, thereby pulling the ball head 702 upward, so that the ball head 702 in the bent state returns to its original position, and thus the lower housing 2 and the lower drill bit in the bent state return to the vertical position.

[0074] In an optional embodiment of the present invention, such as Figure 1 As shown, the top of the upper housing 1 is provided with an upper connector 14, which is a vertically arranged cylindrical shape. The upper housing 1 is connected to the upper drilling tool through the upper connector 14.

[0075] In an optional embodiment of the present invention, such as Figure 1 , Figure 2As shown, the interiors of the upper housing 1, the piston 3, and the ball head 702 form interconnected channels. The adjustable bending joint device also includes a transmission assembly 8, which comprises a first universal joint 801, a splined shaft 802, and a second universal joint 803 arranged sequentially from top to bottom within the channel. The splined shaft 802 is vertically positioned within the channel. The first universal joint 801 is connected to the top end of the splined shaft 802, and the second universal joint 803 is connected to the bottom end of the splined shaft 802. The first universal joint 801 is used to connect to the power output shaft of the upper drilling tool, and the second universal joint 803 is connected to the lower housing 2. Through the cooperation of the first universal joint 801, the splined shaft 802, and the second universal joint 803, the power of the upper drilling tool can be transmitted to the lower drilling tool for drilling operations, and torque can also be transmitted even when the lower housing 2 and the lower drilling tool are in a bent state.

[0076] like Figure 1 , Figure 2 As shown, in the vertical direction, the position of the second universal joint 803 is opposite to the position where the ball sleeve 701 and the ball head 702 are connected, and there is a gap 12 between the top of the lower housing 2 and the bottom of the upper housing 1, so that the lower housing 2 can be bent relative to the upper housing 1.

[0077] In an optional embodiment of the present invention, such as Figure 1 As shown, a lower connector 10 is provided at the bottom of the lower housing 2. The lower connector 10 is a vertically arranged cylindrical shape, and the lower housing 2 is connected to the lower drilling tool through the lower connector 10.

[0078] Furthermore, such as Figure 1 , Figure 2 As shown, the bottom of the lower housing 2 is connected to the top of the lower connector 10. PDC composite sheets 11 are respectively provided on the bottom end face of the lower housing 2 and the top end face of the lower connector 10, forming a friction pair. The PDC composite sheets 11 on the bottom end face of the lower housing 2 and the top end face of the lower connector 10 cooperate to bear and transmit drilling pressure. The PDC composite sheet 11 is a polycrystalline diamond composite sheet commonly used in drilling engineering; its specific structure and installation method are not limited here.

[0079] In an optional embodiment of the present invention, such as Figure 1 As shown, the adjustable bending joint device while drilling also includes a vertically arranged mandrel 9. The top end of the mandrel 9 is located in the channel and connected to the second universal joint 803. The lower part of the mandrel 9 extends to the bottom of the channel and at least part of the mandrel 9 extends into the lower joint 10. The part of the mandrel 9 extending to the bottom of the channel is connected to the lower housing 2 and the lower joint 10 respectively.

[0080] In an optional embodiment of the present invention, such as Figure 1As shown, the upper housing 1 includes an upper housing section 101 and a piston housing section 102 connected sequentially from top to bottom. Both the upper housing section 101 and the piston housing section 102 are vertically arranged cylindrical sections. The first universal joint 801 and a portion of the splined shaft 802 are located inside the upper housing section 101, while the other portion of the splined shaft 802, the second universal joint 803, and the piston component 3 are located inside the piston housing section 102. The bottom end of the upper housing section 101 is detachably connected to the top end of the piston housing section 102 (e.g., by screwing), facilitating the installation and replacement of internal components.

[0081] The working principle of the adjustable bending joint device while drilling of the present invention is as follows:

[0082] Connect the upper connector 14 to the upper drill bit, the first universal joint 801 to the power output end of the upper drill bit, connect the cable to the cable connector, and connect the lower connector 10 to the lower drill bit. When it is necessary to increase the bending angle, control the electro-hydraulic pump to rotate forward, hydraulic oil enters the upper cavity and pushes the piston 3 downward. The protrusion 302 at the bottom of the piston 3 pushes the ball head 702 to rotate. The lower housing 2, lower connector 10, and spindle 9 rotate with the ball head 702 at the same angle, completing the bending action. When it is necessary to decrease the bending angle, control the electro-hydraulic pump to rotate in reverse, hydraulic oil enters the lower cavity and pushes the piston 3 upward. The return hook structure between the protrusion 302 at the bottom of the piston 3 and the ball head 702 pulls the ball head 702 to rotate in the opposite direction. The lower housing 2, lower connector 10, and spindle 9 rotate with the ball head 702 at the same angle (restoring the original vertical position), completing the bending action.

[0083] When self-locking of the bending angle is required, the control electro-hydraulic pump stops working, and the first valve and the second valve on the infusion line 6 are closed, so that the hydraulic oil in the upper cavity, the lower cavity and the infusion line 6 cannot flow, and the piston 3 forms a self-locking at the current position, thereby realizing the self-locking of the bending angle.

[0084] During the above-mentioned working process, the torque is transmitted as follows: the torque is transmitted sequentially through the first universal joint 801, the spline shaft 802, the second universal joint 803, and the mandrel 9 to the lower connector 10; when the lower drill bit is in a bent state, the first universal joint 801 and the second universal joint 803 are connected to the spline shaft 802 at corresponding angle changes, thereby realizing the transmission of large torque.

[0085] In the above-mentioned working process, the transmission of drilling pressure is as follows: the drilling pressure first acts on the drill bit of the lower drilling tool, and the reaction force of the drilling pressure of the lower drilling tool acts on the lower connector 10, and is transmitted to the lower housing 2 and ball head 702 through the friction pair formed by the PDC composite plate 11. Since the ball head 702, ball sleeve 701, fastening ring 704 and fastening sleeve 703 cooperate to form a spherical hinge structure, the reaction force will be jointly borne by the ball sleeve 701, fastening ring 704 and fastening sleeve 703 and transmitted upward in sequence to the piston outer shell section 102, the upper housing section 101 and the upper connector 14, thus realizing the transmission of drilling pressure.

[0086] The features and advantages of the adjustable bending joint device while drilling of this invention are as follows:

[0087] 1. In this adjustable bending joint device while drilling, the bending angle of the lower housing 2 and the lower drill string is precisely adjusted by the controller, and the rotation angle of the ball head 702 is adjusted according to the feedback signal of the drive device 5, so as to achieve the purpose of bending angle detection and realize closed-loop control.

[0088] Second, in this adjustable bending joint device while drilling, the movement position of the piston 3 can be precisely controlled by controlling the flow of liquid from the storage device 4 into the piston chamber 301 through the drive device 5, thereby achieving precise and stepless adjustment of the bending angle. At the same time, when the liquid stops entering and leaving the piston chamber 301, the bending angle can be self-locked. This not only greatly improves the degree of automation, but also improves the reliability and bending control accuracy, which can meet the high torque, electronic control, and precise orientation requirements of downhole electric motor drilling systems.

[0089] Third, in this adjustable bending joint device for drilling, the first universal joint 801, the spline shaft 802 and the second universal joint 803 cooperate to transmit the power of the upper drilling tool to the lower drilling tool for drilling operations, and also ensure the transmission of large torque when the lower housing 2 and the lower drilling tool are in any bending state.

[0090] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A drilling-adjustable bend joint device, characterized in that, The adjustable bending joint device while drilling includes: The upper housing contains a liquid storage device, a driving device, and a liquid delivery pipeline, and the driving device is connected to the liquid storage device. A piston assembly is disposed vertically within the upper housing, and a piston cavity is formed between the outer wall of the piston assembly and the inner wall of the upper housing. The piston cavity is connected to the liquid storage device through the infusion pipeline. The driving device can drive the liquid in the liquid storage device to flow between the liquid storage device and the piston cavity, so as to drive the piston assembly to move vertically. A bending assembly includes a cylindrical ball sleeve and a cylindrical ball head. The ball sleeve is disposed inside the upper housing, and the lower inner wall of the ball sleeve forms a concave first spherical surface. The upper outer surface of the ball head forms a convex second spherical surface, which is rotatably embedded in the first spherical surface. One side of the piston has a downwardly extending protrusion, the bottom of which abuts against one side of the top of the ball head. The lower housing is located below the upper housing. The bottom of the lower housing is used to connect to the lower drill bit. The lower part of the ball head extends to the bottom of the upper housing and is connected to the lower housing, so that the lower housing and the lower drill bit can bend to a preset angle through the ball head.

2. The adjustable bending joint device while drilling as described in claim 1, characterized in that, The upper housing has a first accommodating cavity and a second accommodating cavity, and the driving device and the liquid storage device are respectively disposed in the first accommodating cavity and the second accommodating cavity; The driving device includes a driving part and an electrical connection part. The signal output terminal of the electrical connection part is electrically connected to the signal receiving terminal of the driving part. The electrical connection part is electrically connected to the controller via a cable.

3. The adjustable bending joint device while drilling as described in claim 2, characterized in that, The drive section includes an electro-hydraulic pump, and the electrical connection section includes a cable connector that is electrically connected to the electro-hydraulic pump. And / or, the liquid storage device is a capsule housing containing hydraulic fluid.

4. The adjustable bending joint device for drilling as described in claim 1, characterized in that, The outer wall of the piston is formed with an annular sealing boss along its circumference. The outer wall surface of the sealing boss is slidably and sealingly connected to the inner wall of the upper housing. The sealing boss can divide the piston chamber into an upper chamber located above the sealing boss and a lower chamber located below the sealing boss. The upper chamber and the lower chamber are respectively connected to the liquid storage device through the infusion pipeline. The infusion pipeline located between the upper chamber and the liquid storage device is equipped with a first valve, and the infusion pipeline located between the lower chamber and the liquid storage device is equipped with a second valve.

5. The adjustable bending joint device for drilling as described in claim 2, characterized in that, A third accommodating cavity is formed inside the upper housing, and a pressure sensor is installed in the third accommodating cavity. The signal detection end of the pressure sensor is connected to the infusion pipeline, and the signal output end of the pressure sensor is electrically connected to the controller through the cable.

6. The adjustable bending joint device for drilling as described in claim 1, characterized in that, The bending assembly further includes a fastening sleeve and a fastening ring. The fastening sleeve is connected to the bottom of the upper housing, and an annular limiting boss is formed on the bottom inner wall of the fastening sleeve. The fastening ring is located inside the fastening sleeve and connected to the limiting boss. When the ball head is fitted with the ball sleeve, the bottom outer wall of the ball head rotates and abuts against the inner wall of the fastening ring to vertically limit the ball head. The ball head, ball sleeve, fastening sleeve, and fastening ring cooperate to form a spherical hinge structure.

7. The adjustable bending joint device for drilling as described in claim 6, characterized in that, The fastening sleeve is provided with a strip-shaped hole extending along its axial direction, and a plurality of the strip-shaped holes are distributed at intervals along the circumference of the fastening sleeve. A plurality of torque transmission pins are provided at intervals along the circumference of the outer wall of the ball head, and the plurality of torque transmission pins are rotatably embedded in the corresponding strip-shaped hole along the radial direction of the fastening sleeve.

8. The adjustable bending joint device for drilling as described in claim 1, characterized in that, The bottom surface of the protrusion is a first arc-shaped surface that protrudes downwards, and one side of the top of the ball head has a second arc-shaped surface that is recessed downwards. The first arc-shaped surface abuts against the second arc-shaped surface to form an arc-shaped contact surface between the protrusion and the ball head.

9. The adjustable bending joint device while drilling as described in claim 8, characterized in that, The second arc-shaped surface has a first limiting boss on each of its two opposite sides, and the piston has a second limiting boss at its bottom, which is located below the first limiting boss. When the piston moves upward, the top of the second limiting boss abuts against the bottom of the first limiting boss, and the ball head, which is in a bent state, returns to its original position.

10. The adjustable bending joint device for drilling as described in any one of claims 1 to 9, characterized in that, The interior of the upper housing, the interior of the piston, and the interior of the ball head form a through channel; The adjustable bending joint device while drilling also includes a transmission assembly, which includes a first universal joint, a spline shaft, and a second universal joint arranged sequentially from top to bottom in the channel. The first universal joint and the second universal joint are respectively connected to the top and bottom ends of the spline shaft. The first universal joint is used to connect to the power output shaft of the upper drill bit, and the second universal joint is connected to the lower housing.

11. The adjustable bending joint device for drilling as described in claim 10, characterized in that, The bottom of the lower housing is provided with a lower connector, through which the lower drill bit is connected.

12. The adjustable bending joint device for drilling as described in claim 11, characterized in that, The bottom of the lower housing is connected to the top of the lower connector. PDC composite sheets are respectively provided on the bottom end face of the lower housing and the top end face of the lower connector, and they cooperate to form a friction pair.

13. The adjustable bending joint device for drilling as described in claim 11, characterized in that, The adjustable bending joint device while drilling also includes a mandrel, the top end of which is located in the channel and connected to the second universal joint, the lower part of which extends below the channel and at least part of which extends into the lower joint, and the part of which extends below the channel is connected to the lower housing and the lower joint respectively.

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