Coiled tubing drilling electro-hydraulic control continuous rotary steering device

Abstract

The present application belongs to the field of oil and gas exploration and development, and discloses a continuous pipe drilling electro-hydraulic control continuous rotation type directional device, which comprises an upper assembly, a central shaft and a lower assembly, the lower assembly comprises a flow passage conversion joint, a lower rotating part, a wave-shaped disc, a piston cylinder, a plurality of elastic members and a plurality of plug columns, the upper end of the flow passage conversion joint is connected to the upper assembly, the lower end is connected to the lower rotating part, the lower rotating part is provided with a bent screw rod, the central shaft is arranged in the upper assembly and the lower assembly and is fixedly connected with the inner wall of the flow passage conversion joint, the wave-shaped disc is fixedly arranged on the central shaft, the piston cylinder is rotatably arranged on the central shaft and the outer wall thereof is fixedly connected with the lower rotating part, the plurality of plug columns are slidably arranged in a plurality of round holes and always abut against the wave-shaped surface of the wave-shaped disc under the action force of the elastic members, and the hydraulic system pumps hydraulic oil through an inlet flow passage to make the piston cylinder rotate. The present application can drive the bent screw rod to slide and drill or drive the bent screw rod to compound drill, so as to meet the drilling requirements.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration and development technology, and in particular to a continuous rotating directional drilling electro-hydraulic control device for coiled tubing drilling. Background Technology

[0002] Coiled tubing drilling downhole tools are the foundation for coiled tubing drilling operations, and the directional drilling system is the core of these tools. Currently, directional drilling systems are classified into three types: hydraulically controlled, electrically controlled, and electro-hydraulic controlled. Electro-hydraulic directional drilling systems are widely used due to their high precision and strong controllability. In an electro-hydraulic directional drilling system, a hydraulic mechanism drives the lower connector to rotate. This mechanism includes a piston and a lead screw. The lead screw is fixedly connected to the lower connector, and the piston is threadedly connected to the lead screw. Hydraulic oil pushes the piston to move, thus rotating the lower connector. This, in turn, causes the lower connector to drive the bent screw to adjust the direction, thereby controlling the drilling trajectory.

[0003] However, due to limitations in the piston and lead screw structure of existing hydraulic mechanisms, continuous rotation of the lower connector cannot be achieved. Furthermore, because the angle of the bent screw is fixed, the build-up rate of the electro-hydraulic directional drilling device cannot be adjusted. When the build-up rate of the electro-hydraulic directional drilling device cannot meet the wellbore trajectory control requirements, the downhole tools must be strung together to replace the bent screws with different angles, and a straight screw must be used in conjunction to meet the drilling requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a continuous rotating directional drilling electro-hydraulic control device that can adjust the tool face angle and build-up rate of directional drilling, thereby meeting the requirements for controlling the well trajectory.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A continuous rotary directional drilling electro-hydraulic control system for coiled tubing drilling includes:

[0007] The system comprises a central shaft, an upper assembly, and a lower assembly, each equipped with an inlet channel and an outlet channel. The inlet channel is connected to a hydraulic system. The lower assembly includes a channel conversion joint, a lower rotating component, a wave plate, a piston cylinder, multiple elastic elements, and multiple plungers. The upper end of the channel conversion joint is fixedly connected to the upper assembly, and the lower end is equipped with the lower rotating component, which carries a drill bit. The central shaft is located within the upper and lower assemblies and is fixedly connected to the channel conversion joint. The wave plate is fixedly sleeved on the central shaft, and the piston cylinder is rotatably sleeved on the central shaft. The piston cylinder is fixedly connected to the lower rotating component, away from the outer wall of the central shaft. Multiple plungers are slidably disposed within multiple circular holes in the piston cylinder. The elastic elements are configured to ensure that the plungers always abut against the wave surface of the wave plate. Each circular hole has a channel, and when the piston cylinder rotates, each channel alternately connects to the inlet channel and the outlet channel.

[0008] As an optional solution, the inlet channel includes a first inlet channel disposed on the upper component, a second inlet channel on the upper part of the central shaft, a third inlet channel of the inlet channel conversion joint, and a plurality of fourth inlet channels on the lower part of the central shaft, wherein the first inlet channel, the second inlet channel, the third inlet channel, and the fourth inlet channels are connected in sequence;

[0009] The outlet channel includes a first outlet channel disposed on the upper component, a second outlet channel on the upper part of the central shaft, a third outlet channel of the outlet channel conversion joint, and a plurality of fourth outlet channels on the lower part of the central shaft. The first outlet channel, the second outlet channel, the third outlet channel, and the fourth outlet channels are connected in sequence.

[0010] Multiple fourth inlet channels and multiple fourth outlet channels are alternately distributed, and when the piston cylinder rotates, each of the channels alternately connects to the fourth inlet channel and the fourth outlet channel.

[0011] As an alternative, a first annular cavity is provided at the position where the fourth inlet channel of the central shaft communicates with the third inlet channel. The first annular cavity is connected to multiple fourth inlet channels, and the central shaft is provided with a first through hole that communicates with the first annular cavity. The third inlet channel is connected to the first through hole.

[0012] A second annular cavity is provided at the position where the fourth outlet channel of the central shaft communicates with the third outlet channel. The second annular cavity is connected to multiple fourth outlet channels. The central shaft is provided with a second through hole that communicates with the second annular cavity. The third outlet channel is connected to the second through hole.

[0013] As an alternative, a steel ball is provided at the end of the plunger facing the waveform disk.

[0014] As an optional solution, two waveform disks are provided, distributed on both sides of the piston cylinder. The circular holes of the piston cylinder are through-holes. The plungers are divided into two groups, and multiple elastic elements are respectively disposed in multiple circular holes. In one group of plungers, multiple plungers are disposed in multiple circular holes and located on one side of the elastic element, while multiple plungers in the other group are disposed in multiple circular holes and located on the other side of the elastic element.

[0015] As an optional solution, the upper component includes an upper connector, which is provided with a first inlet channel, a first outlet channel, and two oil ports. The two oil ports are respectively connected to the first inlet channel and the first outlet channel, and oil plugs are respectively provided on the two oil ports.

[0016] As an alternative, the upper component further includes an outer cylinder, which is fixedly connected to the upper connector, and the hydraulic system is disposed inside the outer cylinder.

[0017] As an alternative, the upper component further includes a force transmission element, and an annular groove is provided on the central shaft. The force transmission element is disposed in the annular groove and abuts against the end of the flow channel conversion joint facing the upper joint.

[0018] As an optional embodiment, the lower rotating component includes a rotary joint, a double female joint, and a lower joint. The upper and lower ends of the double female joint are respectively connected to the rotary joint and the lower joint. The rotary joint is rotatably connected to the flow channel conversion joint. The outer wall of the piston cylinder is fixedly connected to the inner wall of the double female joint. The lower joint is fixedly equipped with the drilling tool.

[0019] As an optional solution, a backstop is provided between the rotary joint and the flow channel conversion joint.

[0020] The beneficial effects of this invention are:

[0021] This invention provides a continuous rotary directional drilling electro-hydraulic control device, comprising an upper assembly, a central shaft, and a lower assembly. The upper assembly, lower assembly, and central shaft are all provided with inlet and outlet channels. The lower assembly includes a channel conversion joint, a lower rotating component, a wave plate, a piston cylinder, multiple elastic components, and multiple plungers. The upper end of the channel conversion joint is connected to the upper assembly, and the lower end is connected to the lower rotating component. The central shaft is disposed within the upper and lower assemblies and is fixedly connected to the inner wall of the channel conversion joint. The wave plate is fixedly disposed on the central shaft. The piston cylinder is rotatably disposed on the central shaft, and its outer wall is fixedly connected to the lower rotating component. The multiple plungers are slidably disposed within multiple circular holes and, under the force of the elastic components, always abut against the wave surface of the wave plate. The wave surface has crests and troughs. The circular holes are provided with channels. When the piston cylinder rotates, each channel alternately connects to the inlet and outlet channels. The hydraulic system is connected to the inlet channel. When the piston cylinder's orifice is connected to the inlet channel, the hydraulic oil in the hydraulic system enters the circular hole and pushes the plunger against the wave plate. Since the wave plate is fixed, the reaction force of the wave plate drives the piston cylinder to rotate. When the piston cylinder's orifice is connected to the outlet channel, the wave plate causes the plunger to retract, and the hydraulic oil in the circular hole enters the outlet channel. This process is repeated to make the piston cylinder rotate continuously, which in turn drives the lower rotating component to rotate continuously. The lower rotating component is equipped with a drill string (bent screw). This continuous rotating directional drilling electro-hydraulic control device can drill at the angle of the bent screw when the drill string (bent screw) slides during drilling. When the lower rotating component simultaneously drives the bent screw to rotate continuously, it can achieve stable angled drilling of this continuous rotating directional drilling electro-hydraulic control device. This continuous tubing drilling electro-hydraulic controlled continuous rotary directional device can select either sliding drilling with a bent screw or simultaneous rotation of the bent screw by a lower rotating component for compound drilling, depending on the requirements. It can effectively control the well trajectory and solve the problem of the build-up rate not meeting the well trajectory without having to pull it out, thus improving drilling efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the upper part of the continuous rotary directional drilling electro-hydraulic control device provided in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the middle part of the continuous rotary directional drilling electro-hydraulic control device provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the lower part of the continuous rotary directional drilling electro-hydraulic control device provided in an embodiment of the present invention;

[0025] Figure 4 This is an unfolded view of the waveform disk, piston cylinder, and plunger provided in an embodiment of the present invention;

[0026] Figure 5 yes Figure 2 Cross-sectional view of AA;

[0027] Figure 6 yes Figure 2 Cross-sectional view of BB;

[0028] Figure 7 yes Figure 2 Cross-sectional view of CC;

[0029] Figure 8 yes Figure 3 Cross-sectional view of DD;

[0030] Figure 9 yes Figure 3 Cross-sectional view of EE;

[0031] Figure 10 yes Figure 3 Cross-sectional view of FF;

[0032] Figure 11 yes Figure 3 Cross-sectional view of GG;

[0033] Figure 12 yes Figure 3 Cross-sectional view of HH.

[0034] In the picture:

[0035] 10. Central axis; 11. First annular cavity; 12. Second annular cavity;

[0036] 21. Flow channel conversion joint; 211. Check valve; 22. Waveform plate; 23. Piston cylinder; 24. Elastic element; 25. Plug; 251. Steel ball; 26. Rotary joint; 27. Double female joint; 28. Lower joint;

[0037] 31. First inlet channel; 32. Second inlet channel; 33. Third inlet channel; 34. Fourth inlet channel;

[0038] 41. First outlet channel; 42. Second outlet channel; 43. Third outlet channel; 44. Fourth outlet channel;

[0039] 51. Upper connector; 52. Oil plug; 53. Outer cylinder; 54. Anti-reverse sleeve; 55. Split retaining ring; 56. Snap ring; 57. Anti-reverse pin;

[0040] 60. Square key;

[0041] 70. Tapered roller bearings;

[0042] 80. Roller thrust bearing; 81. Circular sleeve. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0047] like Figures 1-12 As shown, this embodiment of the invention provides an electro-hydraulic controlled continuous rotary directional drilling device, including an upper assembly, a lower assembly, and a central shaft 10. The upper assembly, lower assembly, and central shaft 10 are provided with inlet channels and outlet channels, and the inlet end of the inlet channel and the outlet end of the outlet channel are both connected to a hydraulic system. Specifically, refer to... Figure 2 and Figure 3 The lower assembly includes a flow channel conversion joint 21, a lower rotating component, a wave plate 22, a piston cylinder 23, multiple elastic elements 24, and multiple plungers 25. The upper end of the flow channel conversion joint 21 is fixedly connected to the upper assembly by threads and sealed with a sealing ring. The lower end of the flow channel conversion joint 21 is connected to the lower rotating component by threads. (Refer to...) Figure 2 and Figure 7The central shaft 10 is located within the upper and lower components and is fixedly connected to the inner wall of the flow channel conversion joint 21 via a square key 60. The wave plate 22 is sleeved on the central shaft 10 and fixedly connected to it via a square key 60. The piston cylinder 23 is rotatably sleeved on the central shaft 10, and is fixedly connected to the lower rotating component via a spline structure away from the outer wall of the central shaft 10. The piston cylinder 23 has multiple circular holes, and multiple plungers 25 are slidably disposed within these holes. The elastic element 24 ensures that the plungers 25 always abut against the wave surface of the wave plate 22, preventing a hard collision between the plungers 25 and the wave plate 22. (Refer to...) Figure 4 The waveform surface is a curved surface with eight peaks and eight troughs. Multiple plungers 25 can move toward or away from the waveform disk 22 to drive the piston cylinder 23 to rotate. Each circular hole is provided with a channel. When the piston cylinder 23 rotates, each channel alternately connects the inlet channel and the outlet channel. The lower rotating component is equipped with a drill bit (i.e., a bent screw). When the continuous tubing drilling electro-hydraulic controlled continuous rotary directional device is drilling, the lower rotating component is used to drive the bent screw to rotate. The hydraulic system pumps hydraulic oil into the inlet channel. The hydraulic oil enters the circular hole through the inlet channel and pushes the plunger 25 toward the wave plate 22. Since the wave plate 22 is fixed to the central shaft 10, the plunger 25 contacts the wave surface and is subjected to the reaction force of the wave surface. The piston cylinder 23 rotates. The channel connects with the outlet channel. The plunger 25 retracts, and the hydraulic oil flows back to the hydraulic system through the outlet channel. The plunger 25 reciprocates and simultaneously performs a circular motion. The piston cylinder 23 drives the lower rotating component to rotate, which in turn drives the bent screw to rotate.

[0048] This coiled tubing drilling electro-hydraulic controlled continuous rotary directional drilling device can perform directional drilling at a set angle according to the bent screw during sliding drilling of the drill string (bent screw). When the lower rotating component simultaneously drives the bent screw to rotate continuously, stable directional drilling is achieved. This coiled tubing drilling electro-hydraulic controlled continuous rotary directional drilling device can select between sliding drilling with the bent screw or combined drilling with the lower rotating component driving the bent screw, effectively controlling the wellbore trajectory and solving the problem of insufficient build-up rate without needing to retrieve the drill string, thus improving drilling efficiency.

[0049] It is understandable that by using a coiled tubing drilling electro-hydraulic controlled continuous rotary directional device to slide the bent screw for a set distance, and then combining this with the lower rotating component driving the bent screw for a compound drilling distance—that is, drilling a set distance at a set angle using the bent screw, followed by stabilizing the angle for a set distance—the required build-up rate can be met, thus achieving directional drilling. Furthermore, by controlling the hydraulic oil displacement of the hydraulic system, the rotational speed of the lower rotating component can be effectively increased or decreased, achieving both high-speed rotation and precise control. The hydraulic system outputs high torque, and the hydraulic oil circulates in a closed loop within the coiled tubing drilling electro-hydraulic controlled continuous rotary directional device, unaffected by external drilling fluid.

[0050] like Figure 1 and Figure 2 As shown, the upper component includes an outer cylinder 53 and an upper connector 51. The upper ends of the outer cylinder 53 and the upper connector 51 are fixedly connected by threads, and an anti-retraction pin 57 is provided between the outer cylinder 53 and the upper connector 51, and a sealing ring is used for sealing. The outer cylinder 53 is a long cylinder structure and has a hydraulic system inside. The lower end of the upper connector 51 is fixedly connected to the flow channel conversion connector 21 by threads, and a sealing ring is used for sealing.

[0051] The upper component also includes a force transmission element. An annular groove is provided on the central shaft 10, and the force transmission element is disposed within the annular groove and abuts against the end of the flow channel conversion joint 21 facing the upper connector 51. This force transmission element can transmit the axial force of the central shaft 10 to the flow channel conversion joint 21. Specifically, the force transmission element includes an anti-reverse sleeve 54 and a split retaining ring 55, which are nested together and installed within the annular groove of the central shaft 10. The split retaining ring 55 abuts against the flow channel conversion joint 21, and the anti-reverse sleeve 54 abuts against a retaining spring 56 disposed on the central shaft 10.

[0052] Specifically, refer to Figures 1-6 The inlet channel includes a first inlet channel 31, a second inlet channel 32, a third inlet channel 33, and a plurality of fourth inlet channels 34 connected in sequence. The outlet channel includes a first outlet channel 41, a second outlet channel 42, a third outlet channel 43, and a plurality of fourth outlet channels 44 connected in sequence. The first inlet channel 31 and the first outlet channel 41 are symmetrically arranged on the upper connector 51. The second inlet channel 32 and the second outlet channel 42 are symmetrically arranged on the upper part of the central shaft 10. The third inlet channel 33 and the third outlet channel 43 are symmetrically arranged on the channel conversion connector 21. The plurality of fourth inlet channels 34 and the plurality of fourth outlet channels 44 are alternately distributed on the lower part of the central shaft 10. When the piston cylinder 23 rotates, each channel alternately connects to the fourth inlet channel 34 and the fourth outlet channel 44 to make the structure more reasonable.

[0053] The first inlet channel 31 of the upper connector 51 includes two interconnected first upper inlet channels and a first lower inlet channel, and the first outlet channel 41 includes two interconnected first upper outlet channels and a first lower outlet channel. The first upper inlet channels and the first lower inlet channels, as well as the first upper outlet channels and the first lower outlet channels, are connected by process holes. Furthermore, side holes are provided on both sides of the upper end of the upper connector 51, allowing drilling fluid to enter the interior of the central shaft 10 through these side holes.

[0054] To ensure that the inlet and outlet channels are filled with hydraulic oil before being pumped into the hydraulic system, and to prevent air from affecting the normal operation of the continuous rotary directional drilling electro-hydraulic control device, the upper connector 51 is provided with two oil ports, which are respectively connected to the first inlet channel 31 and the first inlet channel 41. Each oil port is equipped with an oil plug 52. Before starting the hydraulic system, hydraulic oil is added to the inlet and outlet channels through the oil plugs 52 to expel air. Furthermore, the oil plug 52 is provided with a sealing groove, and a sealing ring is installed within the sealing groove. It is then installed on the oil port of the upper connector 51 using an NPT tapered fastener to achieve a double seal.

[0055] In this embodiment, refer to Figure 12 The circular holes and channels are arranged in a corresponding manner, with ten holes in total. The fourth inlet channel 34 and the fourth outlet channel 44 are arranged in eight ways. The eight fourth inlet channels 34 and the eight fourth outlet channels 44 are alternately distributed. When the piston cylinder 23 rotates, the ten channels of the piston cylinder 23 are alternately connected to the eight fourth inlet channels 34 and the eight fourth outlet channels 44.

[0056] Reference Figure 8 and Figure 9 A first annular cavity 11 is provided at the position where the fourth inlet channel 34 and the third inlet channel 33 of the central shaft 10 are connected. The first annular cavity 11 is connected to multiple fourth inlet channels 34, and a first through hole is provided on the central shaft 10 that is connected to the first annular cavity 11. The third inlet channel 33 is connected to the first through hole. In this structure, the third inlet channel 33 is simultaneously connected to multiple fourth inlet channels 34.

[0057] A second annular cavity 12 is provided at the position where the fourth outlet channel 44 of the central shaft 10 connects with the third outlet channel 43. The second annular cavity 12 is connected to multiple fourth outlet channels 44. A second through hole is provided on the central shaft 10 that connects to the second annular cavity 12. The third outlet channel 43 is connected to the second through hole. This structure enables the third outlet channel 43 to be connected to multiple fourth outlet channels 44 at the same time.

[0058] To further enhance the rotational force of the lower rotating component, two wave-shaped disks 22 are provided, symmetrically distributed on both sides of the piston cylinder 23. The circular holes of the piston cylinder 23 are through-holes. The plungers 25 are divided into two groups, with multiple elastic elements 24 corresponding to multiple circular holes and distributed within the holes. The elastic elements 24 are compression springs. In one group, multiple plungers 25 are positioned within the circular holes and on one side of the elastic elements 24, with both ends of the plungers 25 abutting against the wave surface of one wave-shaped disk 22 and the elastic element 24, respectively. In the other group, multiple plungers 25 are positioned within the circular holes and on the other side of the elastic elements 24, with both ends of the plungers 25 abutting against the wave surface of the other wave-shaped disk 22 and the elastic element 24, respectively.

[0059] To reduce the sliding friction between the plunger 25 and the wave-shaped surface, a steel ball 251 is provided at the end of the plunger 25 that abuts against the wave-shaped surface. The steel ball 251 is always in contact with the wave-shaped surface to make the sliding smoother.

[0060] Reference Figure 3 and Figures 10-11 The lower rotating component includes a rotary joint 26, a double female joint 27, and a lower joint 28. The double female joint 27 is a cylindrical structure, with its inner wall fixedly connected to the piston cylinder 23 via a spline structure. The upper and lower ends of the double female joint 27 are respectively fixedly connected to the rotary joint 26 and the lower joint 28 via threads and sealed with sealing rings. The rotary joint 26 is mounted on the central shaft 10 and rotatably connected to the flow channel conversion joint 21. The lower end of the lower joint 28 is provided with API oil drill pipe threads for connecting tools such as bent screws. In this structure, the piston cylinder 23 drives the double female joint 27 to rotate, which in turn drives the rotary joint 26 and the lower joint 28 to rotate, enabling the bent screw to rotate under the drive of the continuous rotating directional device controlled by electro-hydraulic control in coiled tubing drilling. This solves the limitation in the prior art that the main body of the continuous rotating directional device controlled by electro-hydraulic control in coiled tubing drilling cannot rotate continuously.

[0061] A tapered roller bearing 70 is provided between the double female connector 27 and the wave plate 22 to improve the smoothness of the double female connector 27.

[0062] Furthermore, a backstop 211 is provided at the lower end of the flow channel conversion joint 21. The backstop 211 is located between the flow channel conversion joint 21 and the rotary joint 26, enabling the rotary joint 26 to rotate in one direction. When viewed from top to bottom, the rotary joint 26 rotates clockwise. However, when the lower joint 28 does not need to rotate during construction, the lower joint 28 transmits the force of the bent screw to the rotary joint 26 through the double female joint 27. The rotary joint 26 then transmits the force to the flow channel conversion joint 21 through the backstop 211, thereby restricting the rotation of the rotary joint 26.

[0063] A roller thrust bearing 80 is provided between the double female connector 27 and the central shaft 10, as shown in the reference. Figure 3A circular sleeve 81 is fitted on the central shaft 10, and a roller thrust bearing 80 is mounted on the circular sleeve 81. The circular sleeve 81 is used to limit the roller thrust bearing 80.

[0064] In this embodiment, all sealing rings are made of high-temperature resistant materials, which are suitable for downhole temperatures of 200°C.

[0065] This continuous tubing drilling electro-hydraulic controlled continuous rotary directional device can achieve sliding drilling with a bent screw during drilling, and can also drive the bent screw for compound drilling, thus meeting the requirements for drilling build-up rate.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A continuous rotary directional drilling electro-hydraulic control system for coiled tubing drilling, characterized in that, include: The central shaft (10), upper assembly, and lower assembly are provided with an inlet channel and an outlet channel, the inlet channel being connected to the hydraulic system; the lower assembly includes an outlet channel conversion joint (21), a lower rotating component, a wave plate (22), a piston cylinder (23), multiple elastic components (24), and multiple plungers (25). The upper end of the outlet channel conversion joint (21) is fixedly connected to the upper assembly, and the lower end is provided with the lower rotating component, which is provided with a drill bit. The central shaft (10) is located within the upper assembly and the lower assembly, and the central shaft (10) is fixedly connected to the outlet channel conversion joint (21). The wave plate (22) is fixedly sleeved on the central shaft (10), the piston cylinder (23) is rotatably sleeved on the central shaft (10), and the piston cylinder (23) is fixedly connected to the lower rotating member away from the outer wall of the central shaft (10). A plurality of piston rods (25) are slidably disposed in a plurality of circular holes in the piston cylinder (23). The elastic member (24) is configured to make the piston rods (25) always abut against the wave surface of the wave plate (22). The circular holes are provided with channels. When the piston cylinder (23) rotates, each channel alternately connects the inlet channel and the outlet channel.

2. The continuous rotary directional drilling electro-hydraulic control device for coiled tubing drilling according to claim 1, characterized in that, The inlet channel includes a first inlet channel (31) disposed on the upper component, a second inlet channel (32) on the upper part of the central shaft (10), a third inlet channel (33) of the inlet channel conversion joint (21), and a plurality of fourth inlet channels (34) on the lower part of the central shaft (10), wherein the first inlet channel (31), the second inlet channel (32), the third inlet channel (33), and the fourth inlet channel (34) are connected in sequence; The outlet channel includes a first outlet channel (41) disposed on the upper component, a second outlet channel (42) on the upper part of the central shaft (10), a third outlet channel (43) of the outlet channel conversion joint (21) and a plurality of fourth outlet channels (44) on the lower part of the central shaft (10), wherein the first outlet channel (41), the second outlet channel (42), the third outlet channel (43) and the fourth outlet channel (44) are connected in sequence; Multiple fourth inlet channels (34) and multiple fourth outlet channels (44) are alternately distributed, and when the piston cylinder (23) rotates, each of the channels alternately connects the fourth inlet channel (34) and the fourth outlet channel (44).

3. The continuous rotary directional drilling electro-hydraulic control device for coiled tubing drilling according to claim 2, characterized in that, A first annular cavity (11) is provided at the position where the fourth inlet channel (34) of the central shaft (10) communicates with the third inlet channel (33). The first annular cavity (11) communicates with multiple fourth inlet channels (34), and the central shaft (10) is provided with a first through hole communicating with the first annular cavity (11). The third inlet channel (33) communicates with the first through hole. A second annular cavity (12) is provided at the position where the fourth outlet channel (44) of the central shaft (10) communicates with the third outlet channel (43). The second annular cavity (12) communicates with multiple fourth outlet channels (44). The central shaft (10) is provided with a second through hole that communicates with the second annular cavity (12). The third outlet channel (43) communicates with the second through hole.

4. The continuous rotary directional drilling electro-hydraulic control device for coiled tubing drilling according to claim 1, characterized in that, The end of the plunger (25) facing the wave plate (22) is provided with a steel ball (251).

5. The continuous rotary directional drilling electro-hydraulic control device for coiled tubing drilling according to claim 1, characterized in that, Two wave-shaped disks (22) are provided, and the two wave-shaped disks (22) are distributed on both sides of the piston cylinder (23). The circular holes of the piston cylinder (23) are through-holes. The plungers (25) are divided into two groups, and multiple elastic elements (24) are respectively disposed in multiple circular holes. In the two groups of plungers (25), multiple plungers (25) in one group are disposed in multiple circular holes and located on one side of the elastic element (24), and multiple plungers (25) in the other group are disposed in multiple circular holes and located on the other side of the elastic element (24).

6. The continuous rotary directional drilling electro-hydraulic control device for coiled tubing drilling according to claim 2, characterized in that, The upper component includes an upper connector (51), which is provided with a first inlet channel (31) and a first outlet channel (41) as well as two oil ports. The two oil ports are respectively connected to the first inlet channel (31) and the first outlet channel (41), and oil plugs (52) are respectively provided on the two oil ports.

7. The continuous rotary directional drilling electro-hydraulic control device for coiled tubing drilling according to claim 6, characterized in that, The upper component also includes an outer cylinder (53), which is fixedly connected to the upper connector (51), and the hydraulic system is disposed inside the outer cylinder (53).

8. The continuous rotary directional drilling electro-hydraulic control device for coiled tubing drilling according to claim 6, characterized in that, The upper component also includes a force transmission element. An annular groove is provided on the central shaft (10). The force transmission element is disposed in the annular groove and abuts against the end of the flow channel conversion joint (21) facing the upper joint (51).

9. The continuous rotary directional drilling electro-hydraulic control device for coiled tubing drilling according to claim 1, characterized in that, The lower rotating component includes a rotary joint (26), a double female joint (27), and a lower joint (28). The upper and lower ends of the double female joint (27) are respectively connected to the rotary joint (26) and the lower joint (28). The rotary joint (26) is rotatably connected to the flow channel conversion joint (21). The outer wall of the piston cylinder (23) is fixedly connected to the inner wall of the double female joint (27). The drill bit is fixedly installed on the lower joint (28).

10. The continuous rotary directional drilling electro-hydraulic control device for coiled tubing drilling according to claim 9, characterized in that, A backstop (211) is provided between the rotary joint (26) and the flow channel conversion joint (21).

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