Bent screw control device and method and bent screw sliding guide system

Abstract

The invention relates to the field of petroleum and natural gas drilling engineering, and discloses a bent screw control device and method and a bent screw sliding guide system. The bent screw control device comprises a main body shaft, a lower joint, a friction outer cylinder, a friction inner cylinder, a clutch module and a control module. The control module can clutch the friction outer barrel and the friction inner barrel and control the clutch duration of the friction outer barrel and the friction inner barrel in the directional drilling working condition, torque transmission among the clutch drill rod, the main body shaft, the friction inner barrel, the clutch module, the friction outer barrel, the lower connector and the bent screw is achieved, the actual tool face angle of the bent screw is close to the expected tool face angle, and the drilling efficiency is improved. Therefore, the difference between the actual tool face angle and the expected tool face angle of the bent screw rod meets the required range, and effective control and balance of orientation of the bent screw rod are achieved.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas drilling engineering, and in particular to a bent screw control device and method and a bent screw sliding guide system. Background Art

[0002] Compared to conventional vertical wells, horizontal wells offer a larger reservoir control area, helping to increase single-well production, reduce formation sand production, enhance recovery rates, and reduce development costs. The efficient and economical development of unconventional resources such as shale oil and gas relies heavily on horizontal well drilling technology. Bent-screw sliding guides are an effective method for horizontal well drilling.

[0003] However, during curved screw sliding steer drilling, the drill string does not rotate, resulting in high friction between the drill string and the wellbore wall, making it difficult to transmit weight on bit. Furthermore, the counter-torque generated by the curved screw makes tool face control difficult.

[0004] Therefore, the related technology urgently needs a method that can effectively control and balance the orientation of the bent screw. Summary of the Invention

[0005] The present invention provides a bent screw control device, method and bent screw sliding guide system, which are used to solve the defect of difficult bent screw control in related technologies and achieve effective control and balance of the bent screw orientation.

[0006] In a first aspect, the present invention provides a bent screw control device, comprising:

[0007] The main shaft, the head is connected to the drill pipe;

[0008] a lower joint, coaxially arranged at the tail end of the main shaft and connected to a bent screw via a measurement while drilling instrument;

[0009] A friction outer cylinder is coaxially arranged on the main shaft, with one end contacting and connecting with the head of the main shaft and the other end being threadedly connected to the lower joint, forming an annular space between the outer cylinder and the middle section of the main shaft;

[0010] a friction inner cylinder, located in the annular space, coaxially arranged on the middle section of the main body shaft, and threadedly connected to the middle section of the main body shaft;

[0011] a clutch module, located in the annular space, coaxially arranged on the middle section of the main shaft, located in front of the friction inner cylinder, and connecting the friction outer cylinder and the friction inner cylinder, for clutching the friction outer cylinder and the friction inner cylinder, and clutching the torque transmission between the drill pipe, the main shaft, the friction inner cylinder, the friction outer cylinder, the lower joint and the bent screw during directional drilling;

[0012] A control module is connected to the clutch module and the measurement while drilling instrument, and is used to adjust the tool face angle of the bent screw so that the difference between the tool face angle of the bent screw and the expected tool face angle is smaller than a preset threshold.

[0013] Optionally, the clutch module includes a servo motor, a magnetic action component, an elastic component, an inner friction disc and an outer friction disc coaxially arranged on the middle section of the main shaft and arranged in sequence; wherein:

[0014] The servo motor is threadedly connected to the middle section of the main shaft, is communicatively connected to the control module, and is fixedly connected to the magnetic action component;

[0015] One end of the elastic component is connected to the magnetic action component, and the other end is connected to the inner friction disk and the friction inner cylinder;

[0016] The inner friction disc is spline-connected to the friction inner cylinder, and the outer friction disc is spline-connected to the friction outer cylinder;

[0017] The control module is used to control the clutch duration of the inner friction plate and the outer friction plate through the servo motor, the magnetic action component and the elastic component.

[0018] Optionally, the magnetic action assembly includes a rotating magnetic disk, a first permanent magnet group, a fixed magnetic disk, and a second permanent magnet group coaxially arranged on the middle section of the main shaft; wherein:

[0019] The rotating shaft of the rotating magnetic disk is fixedly connected to the servo motor and is also fixedly connected to the first permanent magnet group;

[0020] The fixed magnetic disk is threadedly connected to the middle section of the main shaft and is fixedly connected to the second permanent magnet group;

[0021] The first permanent magnet group and the second permanent magnet group are both composed of permanent magnets with radial magnetic field directions, and the magnetic field directions of adjacent permanent magnets are opposite;

[0022] Among them, when the servo motor is started, the rotating magnetic disk is started, the magnetic fields of the first permanent magnet group and the second permanent magnet group are superimposed, and the inner friction disk is in contact with the outer friction disk; when the servo motor is turned off, the rotating magnetic disk is turned off, the magnetic fields of the first permanent magnet group and the second permanent magnet group are offset, and the inner friction disk is separated from the outer friction disk.

[0023] Optionally, the elastic component includes an armature plate, a lever, a support frame, a return spring and a pressure plate coaxially arranged on the middle section of the main shaft; wherein:

[0024] The armature plate is connected to the lever pin;

[0025] The support frame is threadedly connected to the middle section of the main shaft, the pin is connected to the lever, and is fixedly connected to the return spring;

[0026] The return spring is fixedly connected to the support frame;

[0027] The pressure plate is in contact with and connected to the inner friction plate, and is spline-connected to the friction inner cylinder.

[0028] Optionally, the device further comprises an anti-drop module coaxially arranged at the tail of the main body shaft and located before the lower joint;

[0029] The anti-drop module includes an outer anti-drop nut, a bearing assembly and an inner anti-drop nut coaxially arranged at the tail of the main shaft and arranged in sequence;

[0030] The outer anti-drop nut is threadedly connected to the friction outer cylinder;

[0031] The inner anti-drop nut is threadedly connected to the main shaft;

[0032] The bearing assembly is fixed by the end face of the outer anti-drop nut thread and the end face of the inner anti-drop nut, and is used to make the main shaft and the lower joint rotate relative to each other when the friction outer cylinder and the friction inner cylinder are in a separated state.

[0033] Optionally, the device further comprises a composite drilling module;

[0034] The composite drilling module is disposed in the annular space and is coaxially arranged at the head of the main shaft and in front of the clutch module, and is used to transmit the torque generated by the drill pipe to the bent screw in composite drilling conditions;

[0035] The torque transmitted to the bent screw by the bent screw control device in the composite drilling condition is greater than the torque transmitted to the bent screw in the directional drilling condition.

[0036] Optionally, the composite drilling module includes meshing teeth, a meshing disc, a sealing cover, a first hydraulic chamber, a second hydraulic chamber, an electromagnetic reversing valve, a piston push rod and a hydraulic cylinder; wherein:

[0037] The engagement disc is spline-connected to the main shaft and fixedly connected to the piston push rod;

[0038] The meshing teeth are fixedly connected to the friction outer cylinder; the sealing cover is threadedly connected to the hydraulic cylinder;

[0039] The liquid port of the electromagnetic reversing valve is connected to the first hydraulic chamber and the second hydraulic chamber, and is communicatively connected to the control module, and is used to control the liquid in and out of the first hydraulic chamber and the second hydraulic chamber through reversing, so that the piston push rod moves axially, clutches the meshing plate and the meshing teeth, and clutches the torque transmission between the drill rod and the bent screw.

[0040] In a second aspect, the present invention provides a screw bending control method, which is applied to the screw bending control device described in any embodiment of the first aspect; the method comprises:

[0041] The control module obtains the desired tool face angle sent by the ground module and detects the real-time tool face angle of the bent screw through the drilling measurement instrument;

[0042] The control module determines an absolute value of a difference between the desired tool face angle and the real-time tool face angle;

[0043] The control module controls the clutch duration between the friction inner cylinder and the friction outer cylinder through the clutch module according to the absolute value of the difference, so as to control the duration of the target torque acting on the bent screw, so that the absolute value of the difference is less than a preset threshold; wherein, the target torque is the friction torque generated and transmitted by the drill pipe; when the friction inner cylinder and the friction outer cylinder are in contact with each other, the target torque is transmitted to the bent screw in sequence through the main shaft, the friction inner cylinder, the clutch module, the friction outer cylinder and the lower joint.

[0044] Optionally, the control module controls the clutch duration between the friction inner cylinder and the friction outer cylinder through a clutch module according to the absolute value of the difference, so as to control the duration of the target torque acting on the bent screw, so that the absolute value of the difference is less than a preset threshold, including:

[0045] When the absolute value of the difference is not less than the preset threshold, the control module adjusts, through the clutch module, the contact duration and separation duration of the friction inner cylinder and the friction outer cylinder within a set cycle duration, so as to adjust the duration of the target torque acting on the bent screw within the set cycle duration, so that the absolute value of the difference is less than the preset threshold;

[0046] When the absolute value of the difference is smaller than the preset threshold, the control module maintains the engagement duration and separation duration of the friction inner cylinder and the friction outer cylinder within the set cycle duration through the clutch module, so as to maintain the duration of the target torque acting on the bent screw within the set cycle duration, and keep the absolute value of the difference smaller than the preset threshold.

[0047] In a third aspect, the present invention provides a bent screw sliding guide system, comprising:

[0048] Drill pipe;

[0049] The bent screw control device according to any embodiment of the first aspect, wherein the head of the main shaft of the bent screw control device is connected to the drill rod;

[0050] A measurement while drilling instrument, the head of which is connected to the lower connector in the bent screw control device;

[0051] a bent screw, the head of which is connected to the tail of the measurement while drilling instrument;

[0052] A drill bit has a head connected to the tail of the bent screw.

[0053] The present invention provides a bent screw control device, method, and bent screw sliding guide system. The bent screw control device includes a main shaft, a lower joint, a friction outer cylinder, a friction inner cylinder, a clutch module, and a control module. The control module can clutch the friction outer cylinder and the friction inner cylinder during directional drilling, and control the clutching time of the friction outer cylinder and the friction inner cylinder, thereby realizing torque transmission between the clutch drill pipe, the main shaft, the friction inner cylinder, the clutch module, the friction outer cylinder, the lower joint, and the bent screw, so that the actual tool face angle of the bent screw is close to the desired tool face angle, so that the difference between the actual tool face angle of the bent screw and the desired tool face angle meets the required range, thereby achieving effective control and balance of the bent screw orientation. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 A schematic diagram of a bent screw control device according to an embodiment of the present invention

[0056] Figure 2 A flowchart of a screw bending control method provided by an embodiment of the present invention;

[0057] Figure 3 A flow chart of another method for controlling a bent screw provided by an embodiment of the present invention;

[0058] Figure 4 A structural schematic diagram of a bent screw sliding guide system provided in an embodiment of the present invention.

[0059] Figure markings: 1-main shaft; 2-friction outer cylinder; 201-meshing teeth; 3-meshing disk; 4-sealing cover; 5-piston push rod; 6-hydraulic cylinder; 7-servo motor; 8-rotating magnetic disk; 801-first permanent magnet group; 9-fixed magnetic disk; 901-second permanent magnet group; 10-armature disk; 11-lever; 12-support frame; 121-return spring; 13-pressure plate; 14-inner friction disk; 15-outer friction disk; 16-friction inner cylinder; 17-outer anti-drop nut; 18-bearing group; 19-inner anti-drop nut; 20-lower joint; 21-electromagnetic reversing valve; 22-control module; 23-pressure sensor; 24-electromagnetic signal receiver; 25-drill pipe; 26-bent screw orientation device; 27-while-drilling measurement instrument; 28-bent screw; 29-drill bit. DETAILED DESCRIPTION

[0060] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0061] The following combination Figure 1 The bent screw control device of the present invention is described.

[0062] like Figure 1 As shown, this embodiment provides a first bent screw control device 26, which includes:

[0063] The main shaft 1, the head is connected to the drill rod 25;

[0064] The lower joint 20 is coaxially arranged at the tail end of the main shaft 1 and is connected to the bent screw 28 through the drilling measurement instrument 27;

[0065] The friction outer cylinder 2 is coaxially arranged on the main shaft 1, with one end contacting and connecting the head of the main shaft 1 and the other end being threadedly connected to the lower joint 20, forming an annular space between the middle section of the main shaft 1;

[0066] The friction inner cylinder 16 is located in the annular space, coaxially arranged on the middle section of the main shaft 1, and threadedly connected to the middle section of the main shaft 1;

[0067] The clutch module is located in the annular space and is coaxially arranged on the middle section of the main shaft 1, in front of the friction inner cylinder 16, and connects the friction outer cylinder 2 and the friction inner cylinder 16. It is used to clutch the friction outer cylinder 2 and the friction inner cylinder 16, and transmit torque between the clutch drill pipe 25, the main shaft 1, the friction inner cylinder 16, the friction outer cylinder 2, the lower joint 20 and the bent screw 28 during directional drilling conditions;

[0068] The control module is connected to the clutch module and the drilling measurement instrument 27, and is used to adjust the tool face angle of the bent screw 28 so that the difference between the tool face angle of the bent screw 28 and the expected tool face angle is smaller than a preset threshold.

[0069] Optionally, the main shaft 1 includes a first shaft segment, a second shaft segment and a third shaft segment which are arranged in sequence along the axial direction and whose outer diameters decrease in sequence, and the length of the third shaft segment is greater than that of the first shaft segment and the second shaft segment.

[0070] Specifically, the first shaft segment, the second shaft segment and the third shaft segment can be the head segment, the middle segment and the tail segment of the main shaft 1 respectively.

[0071] It should be noted that the control module can control the clutch state of the friction outer cylinder 2 and the friction inner cylinder 16, that is, control the engagement or disengagement of the friction outer cylinder 2 and the friction inner cylinder 16, by controlling the operating state of the clutch module. When the friction outer cylinder 2 and the friction inner cylinder 16 are engaged, the target torque generated by the drill rod 25, i.e., the friction torque, can be transmitted to the bent screw 28 through the main shaft 1, the friction inner cylinder 16, the clutch module, the friction outer cylinder 2, and the lower joint 20 in sequence, acting on the bent screw 28 and adjusting the tool face angle of the bent screw 28. When the friction outer cylinder 2 and the friction inner cylinder 16 are disengaged, the target torque generated by the drill rod 25 cannot be transmitted to the bent screw 28, and the target torque does not act on the bent screw 28.

[0072] Optionally, the control module may include a pressure sensor 23, an electromagnetic signal receiver 24, and a control submodule 22. The pressure sensor 23 may be configured to receive pulse signals transmitted by the surface module. The electromagnetic signal receiver 24 may be configured to receive signals from a measurement while drilling instrument 27 and the surface. The control submodule 22 may determine a desired tool face angle of the bent screw 28 based on the pulse signals transmitted by the surface module and received by the pressure sensor 23. The control submodule 22 may determine an actual tool face angle of the bent screw 28 based on signals from the measurement while drilling instrument 27 and the surface received by the electromagnetic signal receiver 24.

[0073] Specifically, the control module can subtract the actual tool face angle from the desired tool face angle of the bent screw 28 to obtain the absolute value of the difference. According to the absolute value of the difference, the clutch duration between the friction inner cylinder 16 and the friction outer cylinder 2 is controlled through the clutch module, that is, the contact duration and separation duration of the friction inner cylinder 16 and the friction outer cylinder 2 are controlled, thereby controlling the duration of the target torque acting on the bent screw 28, so that the absolute value of the difference is less than the preset threshold value, so that the actual tool face angle of the bent screw 28 can be close to the desired tool face angle.

[0074] It should be noted that the preset threshold can be set by technical personnel according to actual conditions and needs, and this embodiment does not limit this.

[0075] The bent screw control device 26 proposed in this embodiment includes a main shaft 1, a lower joint 20, a friction outer cylinder 2, a friction inner cylinder 16, a clutch module, and a control module. During directional drilling operations, the control module can clutch the friction outer cylinder 2 and the friction inner cylinder 16 and control the clutching duration of the friction outer cylinder 2 and the friction inner cylinder 16, thereby achieving torque transmission between the clutched drill pipe 25, the main shaft 1, the friction inner cylinder 16, the clutch module, the friction outer cylinder 2, the lower joint 20, and the bent screw 28. This allows the actual tool face angle of the bent screw 28 to approach the desired tool face angle, ensuring that the difference between the actual tool face angle of the bent screw 28 and the desired tool face angle falls within a required range, thereby achieving effective control and balance of the direction of the bent screw 28.

[0076] based on Figure 1 In the second bent screw control device proposed in this embodiment, the clutch module includes a servo motor 7, a magnetic action component, an elastic component, an inner friction disc 14, and an outer friction disc 15, which are coaxially arranged on the middle section of the main shaft 1 and arranged in sequence; wherein:

[0077] The servo motor 7 is threadedly connected to the middle section of the main shaft 1, is communicatively connected to the control module, and is fixedly connected to the magnetic action component;

[0078] One end of the elastic component is connected to the magnetic action component, and the other end is connected to the inner friction disc 14 and the friction inner cylinder 16;

[0079] The inner friction disc 14 is spline-connected to the friction inner cylinder 16, and the outer friction disc 15 is spline-connected to the friction outer cylinder 2;

[0080] The control module is used to control the clutch duration of the inner friction disc 14 and the outer friction disc 15 through the servo motor 7, the magnetic action component and the elastic component.

[0081] Optionally, the magnetic action assembly includes a rotating magnetic disk 8, a first permanent magnet group 801, a fixed magnetic disk 9 and a second permanent magnet group 901 coaxially arranged on the middle section of the main shaft 1; wherein:

[0082] The rotating shaft of the rotating disk 8 is fixedly connected to the servo motor 7 and is also fixedly connected to the first permanent magnet group 801;

[0083] The fixed magnetic disk 9 is threadedly connected to the middle section of the main shaft 1 and is fixedly connected to the second permanent magnet group 901;

[0084] The first permanent magnet group 801 and the second permanent magnet group 901 are both composed of permanent magnets with radial magnetic field directions, and the magnetic field directions of adjacent permanent magnets are opposite;

[0085] Among them, when the servo motor 7 is started, the rotating magnetic disk 8 is started, the magnetic fields of the first permanent magnet group 801 and the second permanent magnet group 901 are superimposed, and the inner friction disk 14 and the outer friction disk 15 are in contact; when the servo motor 7 is turned off, the rotating magnetic disk 8 is turned off, the magnetic fields of the first permanent magnet group 801 and the second permanent magnet group 901 are offset, and the inner friction disk 14 and the outer friction disk 15 are separated.

[0086] It should be noted that when the relative permanent magnet magnetic fields of the first permanent magnet group 801 on the rotating disk 8 and the second permanent magnet group 901 on the fixed disk 9 are in the same direction, the magnetic fields are superimposed; when the relative permanent magnet magnetic fields of the first permanent magnet group 801 on the rotating disk 8 and the second permanent magnet group 901 on the fixed disk 9 are in opposite directions, the magnetic fields are canceled.

[0087] Optionally, the elastic component includes an armature plate 10, a lever 11, a support frame 12, a return spring 121 and a pressure plate 13 coaxially arranged on the middle section of the main shaft 1; wherein:

[0088] The armature plate 10 is connected to the lever 11 by a pin;

[0089] The support frame 12 is threadedly connected to the middle section of the main shaft 1, the pin is connected to the lever 11, and is fixedly connected to the return spring 121;

[0090] The return spring 121 is fixedly connected to the support frame 12;

[0091] The pressure plate 13 is in contact with the inner friction plate 14 and is spline-connected to the friction inner cylinder 16 .

[0092] Optionally, the device further comprises an anti-drop module coaxially arranged at the tail of the main shaft 1 and located before the lower joint 20;

[0093] The anti-drop module includes an outer anti-drop nut 17, a bearing assembly 18 and an inner anti-drop nut 19 which are coaxially arranged at the tail end of the main shaft 1 and arranged in sequence;

[0094] The outer anti-drop nut 17 is threadedly connected to the friction outer cylinder 2;

[0095] The inner anti-drop nut 19 is threadedly connected to the main shaft 1;

[0096] The bearing assembly 18 is fixed by the end face of the thread of the outer anti-drop nut 17 and the end face of the inner anti-drop nut 19, and is used to make the main shaft 1 and the lower joint 20 rotate relative to each other when the friction outer cylinder 2 and the friction inner cylinder 16 are in a separated state.

[0097] The bent screw control device proposed in this embodiment has a clutch module that can effectively achieve the clutch between the friction inner cylinder 16 and the friction outer cylinder 2, thereby realizing the torque transmission from the drill rod 25 to the bent screw 28 and effectively controlling the orientation of the bent screw 28.

[0098] based on Figure 1 ,This embodiment proposes a third bent screw control device, which also includes a composite drilling module;

[0099] The composite drilling module is disposed in the annular space and is coaxially arranged at the head of the main shaft 1, in front of the clutch module, and is used to transmit the torque generated by the drill pipe 25 to the bent screw 28 in composite drilling conditions;

[0100] The torque transmitted to the bent screw 28 by the bent screw control device in the composite drilling condition is greater than the torque transmitted to the bent screw 28 in the directional drilling condition.

[0101] Optionally, the composite drilling module includes meshing teeth 201, a meshing disc 3, a sealing cover 4, a first hydraulic chamber, a second hydraulic chamber, an electromagnetic reversing valve 21, a piston push rod 5 and a hydraulic cylinder 6; wherein:

[0102] The engaging disc 3 is spline-connected to the main shaft 1 and fixedly connected to the piston push rod 5;

[0103] The meshing teeth 201 are fixedly connected to the friction outer cylinder 2; the sealing cover 4 is threadedly connected to the hydraulic cylinder 6;

[0104] The liquid port of the electromagnetic reversing valve 21 is connected to the first hydraulic chamber and the second hydraulic chamber, and is communicated with the control module, which is used to control the liquid in and out of the first hydraulic chamber and the second hydraulic chamber by reversing, so that the piston push rod 5 moves axially, the clutch meshing plate 3 and the meshing teeth 201, and the torque transmission between the clutch drill rod 25 and the bent screw 28.

[0105] The bent screw control device proposed in this embodiment can effectively control and balance the bent screw 28 in complex drilling conditions.

[0106] Among related technologies, curved shell screw sliding steering and rotary steering are two approaches to drilling horizontal wells. While rotary steering offers numerous advantages, including low friction, smooth boreholes, and a high degree of automation, the high cost and high risk of stuck drills make curved screw sliding steering the dominant technology for horizontal well directional drilling in China. However, due to the lack of rotation in the drill string, the friction between the drill string and the wellbore wall is high, making it difficult to transmit weight on bit. Furthermore, the counter-torque generated by the curved screw makes tool face control difficult.

[0107] Related technologies have developed a drill string torsion system, which uses a top drive to periodically twist the drill string on the ground to reduce friction, but a sufficiently long drill string is required to offset the counter-torque. There have been many studies on counter-torque tools for controlling or balancing the orientation of bent screws. For example, related technologies can control the pressure drop at both ends of the hollow rotor through the drilling hydraulic pressure difference control assembly, thereby controlling the driving torque to offset the counter-torque. For another example, related technologies can change the size of the pre-friction torque by adjusting the drilling hydraulic pressure difference. For another example, related technologies can use the screw assembly to convert hydraulic energy into mechanical energy of the tool housing to resist the counter-torque. The aforementioned directional tools all use the drilling fluid pressure difference for driving, and there is pressure loss, which may cause the total circulating pump pressure to be too high. Related technologies can also achieve the clutch function by engaging and disengaging the teeth between the toothed clutch structure, but there is a problem of frequent impact during the engagement process.

[0108] It should be noted that the magnetic drive in this embodiment is a permanent magnet, and there is no electromagnetic heating effect. No drilling hydraulic pressure difference is used during directional drilling, and there is no pressure loss.

[0109] like Figure 2 As shown, this embodiment proposes a screw bending control method, which can be applied to any of the above-mentioned screw bending control devices. The method may include the following steps:

[0110] S201. The control module obtains the desired tool face angle sent by the ground module.

[0111] Specifically, the control module may be provided with a pressure sensor 23, an electromagnetic signal sensor, and a control submodule 22. The pressure sensor 23 may receive a pulse signal carrying a desired tool face angle from the surface module, and the control submodule 22 may analyze the pulse signal to determine the desired tool face angle of the bent screw 28.

[0112] S202 , the control module detects the real-time tool face angle of the bent screw 28 through the measurement while drilling instrument 27 .

[0113] Specifically, the electromagnetic signal sensor may receive an actual tool face angle signal obtained by the measurement while drilling instrument 27 through detection, and the control submodule 22 may analyze the actual tool face angle signal to obtain the actual tool face angle.

[0114] S203: The control module determines the absolute value of the difference between the desired tool face angle and the real-time tool face angle.

[0115] Specifically, the control module may subtract the desired tool face angle from the real-time tool face angle, and take the absolute value to obtain the absolute value of the difference between the desired tool face angle and the real-time tool face angle.

[0116] S204. The control module controls the clutch duration between the friction inner cylinder 16 and the friction outer cylinder 2 through the clutch module based on the absolute value of the difference, so as to control the duration of the target torque acting on the bent screw 28, so that the absolute value of the difference is less than a preset threshold value; wherein the target torque is the friction torque generated and transmitted by the drill rod 25; when the friction inner cylinder 16 and the friction outer cylinder 2 are in contact with each other, the target torque is transmitted to the bent screw 28 through the main shaft 1, the friction inner cylinder 16, the clutch module, the friction outer cylinder 2 and the lower joint 20 in sequence.

[0117] It should be noted that the control module can control the clutch state of the friction outer cylinder 2 and the friction inner cylinder 16, that is, control the engagement or disengagement of the friction outer cylinder 2 and the friction inner cylinder 16, by controlling the operating state of the clutch module. When the friction outer cylinder 2 and the friction inner cylinder 16 are engaged, the target torque generated by the drill rod 25, i.e., the friction torque, can be transmitted to the bent screw 28 through the main shaft 1, the friction inner cylinder 16, the clutch module, the friction outer cylinder 2, and the lower joint 20 in sequence, acting on the bent screw 28 and adjusting the tool face angle of the bent screw 28. When the friction outer cylinder 2 and the friction inner cylinder 16 are disengaged, the target torque generated by the drill rod 25 cannot be transmitted to the bent screw 28, and the target torque does not act on the bent screw 28.

[0118] Specifically, the control module can control the clutch duration between the friction inner cylinder 16 and the friction outer cylinder 2 through the clutch module according to the absolute value of the difference, that is, control the contact duration and separation duration of the friction inner cylinder 16 and the friction outer cylinder 2, thereby controlling the duration of the target torque acting on the bent screw 28, so that the absolute value of the difference is less than the preset threshold value, so that the actual tool face angle of the bent screw 28 can be close to the expected tool face angle, so that the difference between the actual tool face angle of the bent screw 28 and the expected tool face angle meets the required range.

[0119] Optionally, step S204 may include:

[0120] When the absolute value of the difference is not less than the preset threshold, the control module adjusts the contact and separation time of the friction inner cylinder 16 and the friction outer cylinder 2 within the set cycle time through the clutch module, so as to adjust the duration of the target torque acting on the bending screw 28 within the set cycle time, so that the absolute value of the difference is less than the preset threshold;

[0121] When the absolute value of the difference is less than a preset threshold, the control module uses the clutch module to maintain the contact time and separation time of the friction inner cylinder 16 and the friction outer cylinder 2 within the set cycle time, so as to maintain the target torque acting on the bending screw 28 within the set cycle time and keep the absolute value of the difference less than the preset threshold.

[0122] The bent screw control method proposed in this embodiment is that the control module can clutch the friction outer cylinder 2 and the friction inner cylinder 16 during directional drilling conditions, and control the clutching time of the friction outer cylinder 2 and the friction inner cylinder 16, so as to realize the torque transmission among the clutch drill pipe 25, the main shaft 1, the friction inner cylinder 16, the clutch module, the friction outer cylinder 2, the lower joint 20 and the bent screw 28, so that the actual tool face angle of the bent screw 28 is close to the expected tool face angle, so that the difference between the actual tool face angle of the bent screw 28 and the expected tool face angle meets the required range, thereby realizing effective control and balance of the orientation of the bent screw 28.

[0123] Another screw bending control method proposed in this embodiment includes the following steps:

[0124] S1, the pressure sensor 23 receives the target tool face angle α signal sent from the ground, and the electromagnetic signal receiver 24 receives the tool face angle β signal detected in real time by the measurement while drilling instrument 27, and stores and processes it in the control submodule 22;

[0125] The target tool face angle is the desired tool face angle.

[0126] S2, the control submodule 22 controls the servo motor 7 to rotate, so that the rotating disk 8 rotates on the main shaft 1;

[0127] S3. By changing the interaction time between the rotating magnetic disk 8 and the fixed magnetic disk 9, the engagement time T1 and the separation time T2 of the inner friction disk 14 and the outer friction disk 15 are changed.

[0128] The method of magnetic field interaction is that when the relative permanent magnet magnetic fields of the first permanent magnet group 801 on the rotating disk 8 and the second permanent magnet group 901 on the fixed disk 9 are in the same direction, the magnetic fields are superimposed; when the relative permanent magnet magnetic fields of the first permanent magnet group 801 on the rotating disk 8 and the second permanent magnet group 901 on the fixed disk 9 are in opposite directions, the magnetic fields are canceled.

[0129] The method for changing the engagement time T1 and separation time T2 of each inner friction disk 14 and the outer friction disk 15 is to control the time of each rotation of the rotating magnetic disk 8 through the servo motor 7, thereby controlling the time of magnetic field superposition and magnetic field offset between the rotating magnetic disk 8 and the fixed magnetic disk 9, and thereby controlling the engagement time and separation time of each inner friction disk 14 and the outer friction disk 15.

[0130] S4. The friction torque is transmitted to the friction outer cylinder 2 through the inner friction disc 14 and the outer friction disc 15 and then to the lower joint 20. The friction torque transmitted to the lower joint 20 interacts with the counter-torque exerted on the outer shell of the bent screw 28, thereby adjusting the tool face angle of the bent screw 28.

[0131] like Figure 3 As shown, in another bent screw control method proposed in this embodiment, the following steps are included:

[0132] S31, the control module receives the target tool face angle α and the real-time tool face angle β detected by the measurement while drilling instrument 27;

[0133] The target tool face angle is the desired tool face angle.

[0134] S32, the control module calculates the error between the target tool face angle α and the real-time tool face angle β;

[0135] The error magnitude is the absolute value of the error between the target tool face angle and the real-time tool face angle.

[0136] S33: Determine whether the error is less than a set value. If so, proceed to step S34. Otherwise, proceed to step S35.

[0137] The set value is the above-mentioned preset threshold.

[0138] S34, when the error is less than the set value, determining that the real-time tool face angle β meets the orientation requirement, and maintaining the engagement time T1 and the separation time T2 of the inner friction disc 14 and the outer friction disc 15;

[0139] S35. When the error is not less than the set value, the control module controls the rotation time of the servo motor 7, and then adjusts the engagement time T1 and separation time T2 of the inner friction disk 14 and the outer friction disk 15, so that the interaction time between the friction torque and the bending screw counter-torque changes, and then adjusts the fluctuation range of the real-time tool face angle β of the bending screw 28, and returns to execute step S33 until the target tool face angle accuracy range is met, and the execution process ends.

[0140] The bent screw control method proposed in this embodiment can effectively control and balance the orientation of the bent screw.

[0141] like Figure 4 As shown, this embodiment provides a bent screw sliding guide system, which includes:

[0142] Drill rod 25;

[0143] Any of the aforementioned bent screw control devices (such as Figure 1 The bent screw control device 26 shown);

[0144] The measuring while drilling instrument 27 has a head connected to the lower connector 20 in the bent screw control device;

[0145] A bent screw 28, the head of which is connected to the tail of the MWD 27;

[0146] The drill bit has a head connected to the tail of the bent screw rod 28.

[0147] It should be noted that if Figure 4As shown, when the drill pipe rotates, it rotates counterclockwise, transmitting a counterclockwise friction torque to the bent screw directional device 26, and similarly to the measurement while drilling instrument 27 and the bent screw. Meanwhile, the drill bit 29 rotates clockwise, transmitting a clockwise reaction torque to the bent screw. This embodiment of the bent screw sliding guidance system is a friction-type bent screw directional drilling system. By varying the duration of the magnetic force, the friction torque is varied, thereby controlling the bent screw tool face angle.

[0148] Specifically, the bent screw sliding guide system of this embodiment can be a hydrate high-build-rate directional drilling system, which is used to achieve high-build-rate directional drilling operations in hydrate reservoirs such as natural gas.

[0149] The bent screw sliding guide system proposed in this embodiment includes a bent screw control device comprising a main shaft 1, a lower joint 20, a friction outer cylinder 2, a friction inner cylinder 16, a clutch module, and a control module. The control module can engage and disengage the friction outer cylinder 2 and the friction inner cylinder 16 during directional drilling operations, and control the engagement and disengagement duration of the friction outer cylinder 2 and the friction inner cylinder 16, thereby enabling torque transmission between the clutch drill pipe 25, the main shaft 1, the friction inner cylinder 16, the clutch module, the friction outer cylinder 2, the lower joint 20, and the bent screw 28. This allows the actual tool face angle of the bent screw 28 to approach the desired tool face angle, ensuring that the difference between the actual tool face angle of the bent screw 28 and the desired tool face angle falls within a required range, thereby achieving effective control and balancing of the orientation of the bent screw 28.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A screw bending control device, characterized in that: include: The main shaft, the head is connected to the drill pipe; a lower joint, coaxially arranged at the tail end of the main shaft and connected to a bent screw via a measurement while drilling instrument; A friction outer cylinder is coaxially arranged on the main shaft, with one end contacting and connecting with the head of the main shaft and the other end being threadedly connected to the lower joint, forming an annular space between the outer cylinder and the middle section of the main shaft; a friction inner cylinder, located in the annular space, coaxially arranged on the middle section of the main body shaft, and threadedly connected to the middle section of the main body shaft; a clutch module, located in the annular space, coaxially arranged on the middle section of the main shaft, located in front of the friction inner cylinder, and connecting the friction outer cylinder and the friction inner cylinder, for clutching the friction outer cylinder and the friction inner cylinder, and clutching the torque transmission between the drill pipe, the main shaft, the friction inner cylinder, the friction outer cylinder, the lower joint and the bent screw during directional drilling; A control module is connected to the clutch module and the measurement while drilling instrument, and is used to adjust the tool face angle of the bent screw so that the difference between the tool face angle of the bent screw and the expected tool face angle is smaller than a preset threshold.

2. The screw bending control device according to claim 1, characterized in that: The clutch module includes a servo motor, a magnetic action component, an elastic component, an inner friction disc and an outer friction disc coaxially arranged on the middle section of the main shaft and arranged in sequence; wherein: The servo motor is threadedly connected to the middle section of the main shaft, is communicatively connected to the control module, and is fixedly connected to the magnetic action component; One end of the elastic component is connected to the magnetic action component, and the other end is connected to the inner friction disk and the friction inner cylinder; The inner friction disc is spline-connected to the friction inner cylinder, and the outer friction disc is spline-connected to the friction outer cylinder; The control module is used to control the clutch duration of the inner friction plate and the outer friction plate through the servo motor, the magnetic action component and the elastic component.

3. The screw bending control device according to claim 2, characterized in that: The magnetic action assembly includes a rotating magnetic disk, a first permanent magnet group, a fixed magnetic disk and a second permanent magnet group coaxially arranged on the middle section of the main shaft; wherein: The rotating shaft of the rotating magnetic disk is fixedly connected to the servo motor and is also fixedly connected to the first permanent magnet group; The fixed magnetic disk is threadedly connected to the middle section of the main shaft and is fixedly connected to the second permanent magnet group; The first permanent magnet group and the second permanent magnet group are both composed of permanent magnets with radial magnetic field directions, and the magnetic field directions of adjacent permanent magnets are opposite; Among them, when the servo motor is started, the rotating magnetic disk is started, the magnetic fields of the first permanent magnet group and the second permanent magnet group are superimposed, and the inner friction disk is in contact with the outer friction disk; when the servo motor is turned off, the rotating magnetic disk is turned off, the magnetic fields of the first permanent magnet group and the second permanent magnet group are offset, and the inner friction disk is separated from the outer friction disk.

4. The screw bending control device according to claim 2, characterized in that: The elastic assembly includes an armature plate, a lever, a support frame, a return spring and a pressure plate coaxially arranged on the middle section of the main shaft; wherein: The armature plate is connected to the lever pin; The support frame is threadedly connected to the middle section of the main shaft, the pin is connected to the lever, and is fixedly connected to the return spring; The return spring is fixedly connected to the support frame; The pressure plate is in contact with and connected to the inner friction plate, and is spline-connected to the friction inner cylinder.

5. The screw bending control device according to claim 1, characterized in that: The device further comprises an anti-drop module coaxially arranged at the tail of the main body shaft and located before the lower joint; The anti-drop module includes an outer anti-drop nut, a bearing assembly and an inner anti-drop nut coaxially arranged at the tail of the main shaft and arranged in sequence; The outer anti-drop nut is threadedly connected to the friction outer cylinder; The inner anti-drop nut is threadedly connected to the main shaft; The bearing assembly is fixed by the end face of the outer anti-drop nut thread and the end face of the inner anti-drop nut, and is used to make the main shaft and the lower joint rotate relative to each other when the friction outer cylinder and the friction inner cylinder are in a separated state.

6. The screw bending control device according to claim 1, characterized in that: The device also includes a composite drilling module; The composite drilling module is disposed in the annular space and is coaxially arranged at the head of the main shaft and in front of the clutch module, and is used to transmit the torque generated by the drill pipe to the bent screw in composite drilling conditions; The torque transmitted to the bent screw by the bent screw control device in the composite drilling condition is greater than the torque transmitted to the bent screw in the directional drilling condition.

7. The screw bending control device according to claim 6, characterized in that: The composite drilling module includes meshing teeth, a meshing disc, a sealing cover, a first hydraulic chamber, a second hydraulic chamber, an electromagnetic reversing valve, a piston push rod and a hydraulic cylinder; wherein: The engagement disc is spline-connected to the main shaft and fixedly connected to the piston push rod; The meshing teeth are fixedly connected to the friction outer cylinder; the sealing cover is threadedly connected to the hydraulic cylinder; The liquid port of the electromagnetic reversing valve is connected to the first hydraulic chamber and the second hydraulic chamber, and is communicatively connected to the control module, and is used to control the liquid in and out of the first hydraulic chamber and the second hydraulic chamber through reversing, so that the piston push rod moves axially, clutches the meshing plate and the meshing teeth, and clutches the torque transmission between the drill rod and the bent screw.

8. A screw bending control method, characterized in that: The bent screw control device according to any one of claims 1 to 7; the method comprising: The control module obtains the desired tool face angle sent by the ground module and detects the real-time tool face angle of the bent screw through the drilling measurement instrument; The control module determines an absolute value of a difference between the desired tool face angle and the real-time tool face angle; The control module controls the clutch duration between the friction inner cylinder and the friction outer cylinder through the clutch module according to the absolute value of the difference, so as to control the duration of the target torque acting on the bent screw, so that the absolute value of the difference is less than a preset threshold; wherein, the target torque is the friction torque generated and transmitted by the drill pipe; when the friction inner cylinder and the friction outer cylinder are in contact with each other, the target torque is transmitted to the bent screw in sequence through the main shaft, the friction inner cylinder, the clutch module, the friction outer cylinder and the lower joint.

9. The method according to claim 8, characterized in that The control module controls the clutch duration between the friction inner cylinder and the friction outer cylinder through the clutch module according to the absolute value of the difference, so as to control the duration of the target torque acting on the bent screw, so that the absolute value of the difference is less than a preset threshold, including: When the absolute value of the difference is not less than the preset threshold, the control module adjusts, through the clutch module, the contact duration and separation duration of the friction inner cylinder and the friction outer cylinder within a set cycle duration, so as to adjust the duration of the target torque acting on the bent screw within the set cycle duration, so that the absolute value of the difference is less than the preset threshold; When the absolute value of the difference is smaller than the preset threshold, the control module maintains the engagement duration and separation duration of the friction inner cylinder and the friction outer cylinder within the set cycle duration through the clutch module, so as to maintain the duration of the target torque acting on the bent screw within the set cycle duration, and keep the absolute value of the difference smaller than the preset threshold.

10. A bent screw sliding guide system, characterized in that: include: Drill pipe; The bent screw control device according to any one of claims 1 to 7, wherein the head of the main shaft of the bent screw control device is connected to the drill rod; A measurement while drilling instrument, the head of which is connected to the lower connector in the bent screw control device; a bent screw, the head of which is connected to the tail of the measurement while drilling instrument; The drill bit has a head connected to the tail of the bent screw.

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