Ultra-short radius directional horizontal well windowing sidetrack drill and well drilling construction method thereof

Abstract

The invention discloses an ultra-short radius directional horizontal well windowing sidetrack drill and a drilling construction method thereof, and relates to the field of drilling construction. According to the ultra-short radius directional horizontal well windowing sidetrack drill and the drilling construction method thereof, a titanium alloy drill rod and a flexible drill rod are connected, a flexible universal joint is arranged between the titanium alloy drill rod and the flexible drill rod, a non-magnetic flexible drill rod is connected with the flexible drill rod, a flexible screw motor is connected with the non-magnetic flexible drill rod, and a centralizer is connected with the flexible screw motor. According to the well drilling construction method, horizontal well drilling is carried out after the bottom of a lateral window is drilled through a drill bit along a whipstock, a new operation instruction is transmitted into an MWD wireless orientator while drilling in a flexible screw motor through a drill bit track adjusting system, and the drill bit is controlled through a bent connector to change the moving track. According to the method, in the horizontal drilling process, the moving track of the drill bit can be changed according to the requirements of customers.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling construction, in particular to an ultra-short radius directional horizontal well window sidetracking and a drilling construction method thereof. BACKGROUND

[0002] For old oil fields that have formed well patterns, conventional horizontal wells cannot be applied on a large scale, and the use of ultra-short radius horizontal boreholes can change straight wells into horizontal wells, providing a powerful and effective development means for the development of thin oil reservoirs, vertical fracture heavy oil reservoirs, low permeability oil reservoirs, etc.

[0003] In the prior art, for example, the short radius drilling tool and drilling method disclosed in Chinese patent CN109854174B, the structure is composed of a roller bit, a straight screw, a non-magnetic flexible drill pipe, a flexible drill pipe and a straight drill pipe connected in sequence, which can realize horizontal drilling with a small curvature radius in the well and reach the designed target depth. However, in actual application, due to the complex and variable underground geological conditions, the pre-designed horizontal section trajectory may not accurately hit the target oil layer, or deviate to the non-target layer or need to be diverted to other oil layers during drilling, which requires re-drilling, cannot modify the trajectory on the original basis, and needs to re-window or drill a new hole, which increases the construction cost and period.

[0004] In view of the deficiencies of the prior art, the present application provides an ultra-short radius directional horizontal well window sidetracking and a drilling construction method thereof to solve the above problems. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides an ultra-short radius directional horizontal well window sidetracking and a drilling construction method thereof, which solves the problem that the pre-designed horizontal section trajectory may not accurately hit the target oil layer due to the complex and variable underground geological conditions, or deviates to the non-target layer or needs to be diverted to other oil layers during drilling, which requires re-drilling, cannot modify the trajectory on the original basis, and needs to re-window or drill a new hole, which increases the construction cost and period.

[0006] To achieve the above purpose, the present application is implemented by the following technical scheme: an ultra-short radius directional horizontal well window sidetracking and a drilling construction method thereof, comprising: a titanium alloy drill pipe; a flexible drill pipe connected with the titanium alloy drill pipe, a flexible universal joint being arranged between the titanium alloy drill pipe and the flexible drill pipe; a non-magnetic flexible drill pipe connected with the flexible drill pipe; a flexible screw motor connected with the non-magnetic flexible drill pipe; a centralizer connected with the flexible screw motor; The non-magnetic drill collar is connected with the flexible screw motor and has a drill bit connected at one end penetrating into the centralizer. The centralizer comprises an elastic end and an elastic centralizing end. The elastic end is connected with the elastic centralizing end and connected with the drill bit. The elastic end buffers the vibration of the drill bit during operation. The elastic centralizing end is connected with the flexible screw motor and is used to stabilize the drill bit and adapt to the changes of the wellbore.

[0007] Preferably, a flexible universal joint is arranged between every two flexible drill pipes. The flexible universal joint comprises a first connecting seat, a high-pressure hose, a spherical groove, a positioning block, a steering ball, and a second connecting seat. The hollow cavity in the first connecting seat is in communication with the high-pressure hose. The high-pressure hose is in communication with the hollow cavity of the second connecting seat. The steering ball is arranged in the spherical groove. The inner wall of the spherical groove is fixedly connected with the positioning block. The positioning block is in sliding connection with the steering ball. The steering ball is fixedly connected with the second connecting seat.

[0008] Preferably, a bent housing is arranged between the end of the non-magnetic drill collar penetrating into the centralizer and the drill bit. The bent housing is internally provided with a bent joint. The bent joint is connected with the drill bit to control the steering of the drill bit.

[0009] Preferably, a whipstock is arranged below the titanium alloy drill pipe and installed in the well.

[0010] Preferably, the elastic end of the centralizer comprises a connecting cylinder and a hard spring. One end of the hard spring is fixedly connected with the connecting cylinder, and the other end is connected with the elastic centralizing end.

[0011] Preferably, the elastic centralizing end of the centralizer comprises an outer shell, a sliding cylinder, an elastic centralizing piece, a ball, and a locking structure. Both ends of the outer shell are slidingly connected with the sliding cylinder. One end of the elastic centralizing piece is fixedly installed on the sliding cylinder through the locking structure. The surface of the elastic centralizing piece is movably installed with the ball.

[0012] Preferably, an LWD sensor module is arranged on the non-magnetic drill collar.

[0013] Preferably, an MWD wireless drilling direction finder is arranged on the non-magnetic flexible drill pipe.

[0014] Preferably, a drill bit trajectory adjustment system is used to adjust the running trajectory of the drill bit. The drill bit trajectory adjustment system is electrically connected with the MWD wireless drilling direction finder, the LWD sensor module, and the flexible screw motor.

[0015] Preferably, a drilling construction method comprises the following steps: Step one, use the pilot gauge to test the target well section casing, ensure that the inner diameter is not deformed, scaling or foreign matter to hinder the inclination of the downhole, using natural gamma logging, high precision gyro survey instrument to determine the inclination of the downhole depth and position, through the ground pump truck to the drill pipe injection high pressure liquid, make the hydraulic mechanism of the whipstock trigger, push the slip to bite the inner wall of the casing, realize the firm anchoring, at the same time, the shear pin is cut off, release the launch drill bit; Step two, the window milling cone cuts the casing of the whipstock position, forms a lateral window; Step three, titanium alloy drill pipe, flexible drill pipe, non-magnetic flexible drill pipe, flexible screw motor, non-magnetic drill collar, centralizer, bend joint, drill bit are connected in turn, the drill bit drills along the lateral window bottom of the whipstock, the centralizer moves with it, the elastic centralizer on the centralizer is extruded downward and deformed by the drill hole and pushes the sliding cylinder to compress the hard spring, reduces the height of the elastic centralizer, makes the centralizer adapt to the drill hole, and the elastic centralizer deforms by extruding the elastic centralizer, so that the centralizer is adapted to the drill hole, and the drill bit is centered, the direction and position of the drill bit are positioned in real time by using MWD wireless drilling direction finder; Step four, when the drill bit needs to change the running track during horizontal drilling, the drill bit track adjusting system acquires target oil layer data and restriction conditions, according to the real-time geological information and seismic horizon provided by the LWD sensor module as a constraint, the stratum model is established through the Kriging interpolation algorithm, the wellbore model is established through the minimum curvature algorithm according to the bottom hole position, inclination angle and azimuth angle sequence measured by the MWD wireless drilling direction finder, the stratum and wellbore model are established through the ray-surface intersection algorithm, the abstract geological steering target is converted into a quantifiable mathematical expression on the basis of the geological and wellbore model, and the optimized target function and its constraint conditions are output, the target function and the constraint conditions are input into the track design algorithm, a plurality of schemes are generated, the plurality of schemes are evaluated to confirm the final wellbore track, the wellbore track is decomposed into a series of specific operation instructions and is sent to the MWD wireless drilling direction finder in the flexible screw motor, the MWD wireless drilling direction finder controls the flexible screw motor to control the drill bit to change the running track through the bend joint, and the drill bit is automatically calibrated in the drilling process until the drill bit is drilled horizontally to the designed depth; Step five, the drilled well is tested to ensure that there is no deformation, foreign matter to hinder the well, if there is, the drilled well is cleaned to remove the hindrance in the well; Step six, open hole, flexible pipe segmented fracturing or flexible screen pipe completion.

[0016] The technical effects and advantages of the present application are as follows: The ultra-short radius directional horizontal well window sidetracking and drilling construction method thereof, by connecting titanium alloy drill rod, flexible drill rod, non-magnetic flexible drill rod, flexible screw motor, non-magnetic drill collar, centralizer, bend joint and drill bit in sequence, the drill bit drills a hole along the opposite side window bottom of the whipstock, then horizontal drilling is carried out, and the operation instruction is transmitted to the MWD wireless while-drilling direction finder in the flexible screw motor through the drill bit trajectory adjustment system, the MWD wireless while-drilling direction finder controls the flexible screw motor to control the drill bit to change the running trajectory through the bend joint, and the drill bit is automatically calibrated in the drilling process until the drill bit is drilled horizontally to the designed depth, so that the drill bit running trajectory can be changed according to the requirement of the customer in the process of horizontal drilling. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present application. Figure 2 It is a schematic diagram of the centralizer structure of the present application. Figure 3 It is a schematic diagram of the centralizer cross-section structure of the present application. Figure 4 It is a schematic diagram of the flexible universal joint cross-section structure of the present application. Figure 5 It is a schematic diagram of the flow structure of the present application. Figure 6 It is a schematic diagram of the drill bit trajectory adjustment system flow structure of the present application.

[0019] In the figure: 1, titanium alloy drill rod; 2, flexible drill rod; 3, flexible universal joint; 31, first connecting seat; 32, high-pressure hose; 33, spherical groove; 34, positioning block; 35, steering ball; 36, second connecting seat; 4, non-magnetic flexible drill rod; 5, flexible screw motor; 6, centralizer; 61, shell; 62, sliding cylinder; 63, elastic centralizing piece; 64, ball; 65, locking structure; 66, hard spring; 67, connecting cylinder; 7, non-magnetic drill collar; 8, drill bit; 9, bend housing; 10, whipstock. DETAILED DESCRIPTION

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This embodiment discloses ultra-short radius directional horizontal well window sidetracking and its drilling construction method, according to the appendix. Figure 1 To be continued Figure 6 As shown, the system includes a titanium alloy drill pipe 1. A guide 10 installed in the well is provided directly below the titanium alloy drill pipe 1. The guide 10 is used to guide the multiple flexible drill pipes 2 connected to the titanium alloy drill pipe 1 and to guide the drill bit 8. A flexible universal joint 3 is provided between the titanium alloy drill pipe 1 and the flexible drill pipe 2, and a flexible universal joint 3 is also provided between every two adjacent flexible drill pipes 2, so that the flexible universal joint 3 is used for the steering of the flexible drill pipe 2. The flexible universal joint 3 is composed of a first connecting seat 31, a high-pressure hose 32, a spherical groove 33, a positioning block 34, a steering ball 35, and a second connecting seat 36. The hollow cavity of the first connecting seat 31 is connected to the hollow cavity of the steering ball 35 through the high-pressure hose 32. The hollow cavity of the steering ball 35 is connected to the hollow cavity of the second connecting seat 36, and the steering ball 35 and the second connecting seat 36 are fixedly connected together. The steering ball 35 is movably installed on the spherical groove 33 opened on the first connecting seat 31, and the positioning block 34, which is fixedly installed on the spherical groove 33, is slidably installed on the steering ball 35 to position the steering ball 35. Through the limitation of the steering ball 35, the spherical groove 33, and the positioning block 34, the steering ball 35 can rotate within the spherical groove 33 from -15° to 15°. The second connecting seat 36 is threadedly connected to the adjacent flexible drill rod 2. The first connecting seat 31 and the second connecting seat 36 are respectively connected to the flexible drill rod 2 or the flexible screw motor 5 and the titanium alloy drill rod 1. When the flexible drill rod 2 deviates, the flexible drill rod 2 drives the steering ball 35 to rotate in the spherical groove 33 through the second connecting seat 36 which is fixedly connected to it, thereby changing the angle between two adjacent flexible drill rods 2. The flexible drill pipe 2 is connected to the non-magnetic flexible drill pipe 4 via the flexible universal joint 3. The MWD wireless drilling directional device is installed inside the non-magnetic flexible drill pipe 4. The MWD wireless drilling directional device measures the bottom hole position, inclination angle and azimuth sequence, and drill bit angle. Then, the non-magnetic flexible drill pipe 4 is connected to the flexible screw motor 5 via the flexible universal joint 3. The other end of the flexible screw motor 5 is connected to the stabilizer 6, and the non-magnetic drill collar 7 connected to the flexible screw motor 5 passes through the stabilizer 6. One end of the collar is connected to the bent joint installed in the bent housing 9. The bent joint is connected to the drill bit 8, and the drill bit 8 is controlled to turn through the bent joint. The bent housing 9 is located between the drill bit 8 and the stabilizer 6. An LWD sensor module is installed at the non-magnetic drill collar 7 between the drill bit 8 and the flexible screw motor 5. The LWD sensor module is used to detect geological information around the drill bit 8 in real time. The centralizer 6 consists of an elastic end and an elastic centralizing end. The elastic end consists of a connecting cylinder 67 and a rigid spring 66. The elastic centralizing end consists of a housing 61, a sliding cylinder 62, an elastic centralizing plate 63, ball bearings 64, and a locking structure 65. The sliding cylinder 62 is slidably installed on both ends of the housing 61, and the two sliding cylinders 62 are respectively installed on both ends of the elastic centralizing plate 63. The elastic centralizing plate 63 and the sliding cylinder 62 are fixed by the locking structure 65. Then, several ball bearings 64 arranged at equal intervals are movably installed on the elastic centralizing plate 63. Then, one end of the sliding cylinder 62 is fixedly connected to the rigid spring 66, and the other end of the rigid spring 66 is fixedly installed in the connecting cylinder 67. The connecting cylinder 67 is fixedly connected to the flexible screw motor 5 by threads, and the connecting cylinder 67 is rotatably connected to the non-magnetic drill collar 7. A damper is installed on the inner wall of the connecting cylinder 67 and is connected to the housing 61 to relieve the excessive rebound and oscillation of the rigid spring 66. The drill bit trajectory adjustment system is used to adjust the running trajectory of the drill bit 8. The drill bit trajectory adjustment system is electrically connected to the MWD wireless drilling directional device, the LWD sensor module, and the flexible screw motor 5. The MWD wireless drilling directional system includes an MWD positioning system, an MWD control system, and a self-correction system. The MWD control system controls the direction of the drill bit 8, and the self-correction system can automatically adjust according to the deviation between the actual drilling trajectory and the planned trajectory to ensure that the wellbore advances along the predetermined route. The drill bit trajectory adjustment system decomposes the final optimized trajectory into a series of specific guiding operation commands, and transmits them in real time to the MWD wireless drilling directional device integrated in the downhole flexible screw motor 5 via a communication link. The directional device dynamically adjusts the tool face direction of the bend joint accordingly, driving the drill bit 8 to adjust its running posture in real time. During the drilling process, the self-correction system achieves automatic trajectory correction, ensuring that the drill bit 8 drills horizontally along the optimized path to the designed depth as needed. The drilling construction method is as follows: The casing of the target well section is tested using a gauging gauge to ensure that there is no deformation, scale, or foreign matter obstructing the lowering of the guide vane. Natural gamma logging and a high-precision gyro inclinometer are used to determine the downhole depth and azimuth where the guide vane should be set. High-pressure fluid is injected into the drill pipe via a surface pump truck to trigger the hydraulic mechanism of the guide vane, pushing the slips to engage with the inner wall of the casing for secure anchoring. At the same time, the shear pin is sheared off and released for the drill bit to be inserted. The milling cone cuts the guide sleeve at the guide angler position to form a lateral window; The titanium alloy drill rod 1, flexible drill rod 2, non-magnetic flexible drill rod 4, flexible screw motor 5, non-magnetic drill collar 7, centralizer 6, elbow joint, and drill bit 8 are connected in sequence. The drill bit 8 drills a hole at the bottom of the side window along the directional tool. The centralizer 6 moves with it. The elastic centralizer plate 63 on the centralizer 6 is deformed downward by the drilling pressure and pushes the slide 62 to compress the hard spring 66, reducing the height of the elastic centralizer plate 63. The centralizer 6 deforms the elastic centralizer plate 63 according to the diameter of the hole, so that the centralizer 6 fits the hole and straightens the drill bit 8, stabilizing the drilling direction of the drill bit 8. The direction and position of the drilling direction of the drill bit 8 are located in real time using the MWD wireless drilling directional tool. When drill bit 8 needs to change its trajectory during horizontal drilling, the drill bit trajectory adjustment system obtains: Target reservoir data: vertical depth of top and bottom boundaries of the reservoir, strike, dip angle, thickness, and coordinates of the target point; Engineering constraints: maximum allowable build-up rate, wellbore stability requirements, and the impact of completion method on wellbore curvature; Based on the real-time lithology, resistivity, gamma parameters, and seismically interpreted stratigraphic positions provided by the LWD sensor module surrounding drill bit 8, and using Kriging interpolation algorithm as spatial constraints, optimal unbiased interpolation in three-dimensional space is performed to construct a continuous formation interface model. Using the bottom hole position, inclination angle, and azimuth sequence measured by the MWD wireless drilling directional system, the wellbore coordinates in three-dimensional space are calculated using the minimum curvature method to establish a wellbore model. The formation interface model and the wellbore model are then compared using a ray-surface intersection algorithm, treating the wellbore trajectory as a parametric curve and connecting it to the formation interface. To determine the entry point, exit point, and crossing interval, a formation and wellbore model is established, clarifying the oil layer contact area. Based on the geological and wellbore models, a multi-objective optimization mathematical model is constructed to transform the abstract geological steering objectives—"maximizing the oil layer contact area" and "minimizing curvature change"—into quantifiable mathematical expressions. The model outputs the optimization multi-objective function formula and its constraints. The constraint is to minimize the curvature change formula, which serves as one of the main constraints to ensure a smooth wellbore and meet completion and tubing string running requirements. The multi-objective function, engineering and geological constraints, and curvature variation minimization input trajectory design algorithm generate multiple schemes, evaluate and confirm the final wellbore trajectory, and decompose the wellbore trajectory into a series of specific operation instructions, which are sent to the MWD wireless drilling directional device in the flexible screw motor 5. The MWD wireless drilling directional device controls the flexible screw motor 5 to control the drill bit 8 to change its running trajectory through the elbow joint, and automatically calibrates the drill bit 8 during the drilling process until the drill bit 8 drills horizontally to the design depth. This realizes that during horizontal drilling, the running trajectory of the drill bit can be changed according to the customer's requirements. Conduct a well cleaning test on the drilled well to ensure that there is no deformation or foreign object obstruction inside the well. If there is, clean the drilled well to remove the obstruction. Open-hole, flexible-tube segmental fracturing, or high-strength flexible screen pipe well completion.

[0022] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A short radius directional horizontal well window sidetrack, characterized in that, Titanium alloy drill rod (1); Flexible drill rod (2) connected with the titanium alloy drill rod (1), a flexible universal joint (3) is arranged between the titanium alloy drill rod (1) and the flexible drill rod (2); Non-magnetic flexible drill rod (4) connected with the flexible drill rod (2); Flexible screw motor (5) connected with the non-magnetic flexible drill rod (4); Centralizer (6) connected with the flexible screw motor (5); Non-magnetic drill collar (7) connected with the flexible screw motor (5) and penetrating the centralizer (6), and a drill bit (8) is connected at one end of the non-magnetic drill collar (7); The centralizer (6) comprises a resilient end and a resilient centralizing end, the resilient end is connected with the resilient centralizing end, and the resilient end is connected with the drill bit (8), the resilient end buffers the vibration of the drill bit (8) during operation, and the resilient centralizing end is connected with the flexible screw motor (5), and the resilient centralizing end is used for stabilizing the drill bit (8) and adapting to the change of the wellbore. A flexible universal joint (3) is arranged between every two flexible drill rods (2), the flexible universal joint (3) comprises a first connecting seat (31), a high-pressure hose (32), a spherical groove (33), a positioning block (34), a steering ball (35) and a second connecting seat (36), a hollow cavity in the first connecting seat (31) is communicated with the high-pressure hose (32), the high-pressure hose (32) is communicated with a hollow cavity of the second connecting seat (36), the steering ball (35) is arranged in the spherical groove (33), an inner wall of the spherical groove (33) is fixedly connected with the positioning block (34), the positioning block (34) is slidably connected with the steering ball (35), and the steering ball (35) is fixedly connected with the second connecting seat (36).

2. The ultra-short radius directional horizontal well window sidetrack of claim 1, wherein, A bent shell (9) is arranged between the non-magnetic drill collar (7) and the drill bit (8) penetrating one end of the centralizer (6), the bent shell (9) is internally provided with a bent joint, the bent joint is connected with the drill bit (8), and the drill bit (8) is controlled to turn.

3. The ultra-short radius directional horizontal well window sidetrack of claim 1, wherein, A whipstock (10) installed in a well is arranged below the titanium alloy drill rod (1).

4. The ultra-short radius directional horizontal well window sidetrack of claim 1, wherein, The resilient end of the centralizer (6) comprises a connecting barrel (67) and a hard spring (66), one end of the hard spring (66) is fixedly connected with the connecting barrel (67), and the other end is connected with the resilient centralizing end.

5. The ultra-short radius directional horizontal well window sidetrack of claim 1, wherein, The resilient centralizing end of the centralizer (6) comprises an outer shell (61), a sliding barrel (62), a resilient centralizing piece (63), a ball (64) and a locking structure (65), both ends of the outer shell (61) are slidably connected with the sliding barrel (62), one end of the resilient centralizing piece (63) is fixedly installed on the sliding barrel (62) through the locking structure (65), and the surface of the resilient centralizing piece (63) is movably installed with the ball (64).

6. The ultra-short radius directional horizontal well window sidetrack of claim 5, wherein, The non-magnetic drill collar (7) is provided with an LWD sensor module.

7. The ultra-short radius directional horizontal well window sidetrack of claim 1, wherein, The non-magnetic flexible drill rod (4) is provided with an MWD wireless while-drilling direction finder.

8. The ultra-short radius directional horizontal well window sidetrack of claim 1, wherein, A drill bit trajectory adjustment system is arranged for adjusting the running trajectory of the drill bit (8), the drill bit trajectory adjustment system is electrically connected with the MWD wireless while-drilling direction finder, the LWD sensor module and the flexible screw motor (5).

9. The ultra-short radius directional horizontal well window sidetrack of claim 1, wherein, The method comprises the following steps: ​ 10. A drilling method using the ultra-short radius directional horizontal well window sidetracking of any one of claims 1 to 9, characterized in that, ​ Step one, use the pilot gauge to test the target well section casing, ensure the inner diameter without deformation, scaling or foreign matter hinder the inclination down, use the natural gamma logging, high precision gyro survey instrument to determine the inclination should be sealed downhole depth and position, through the ground pump truck to the drill pipe injection high pressure liquid, make the hydraulic mechanism trigger, push the slip to bite the casing wall, realize the firm anchoring; At the same time, the shear pin is cut off, and the release is put into the drill bit; Step two, the window milling cone cuts the casing at the position of the inclination, forming a lateral window; Step three, the titanium alloy drill pipe (1), flexible drill pipe (2), non-magnetic flexible drill pipe (4), flexible screw motor (5), non-magnetic drill collar (7), centralizer (6), bend joint, drill bit (8) are connected in turn, so that the drill bit (8) drills along the lateral window bottom of the whipstock, and the centralizer (6) moves with it. The elastic centralizer (63) on the centralizer (6) is deformed downward by extrusion and pushes the sliding cylinder (62) to compress the hard spring (66), which reduces the height of the elastic centralizer (63), so that the centralizer (6) adapts to the drilling hole diameter specification, extrudes the elastic centralizer (63) to deform, and the centralizer (6) adapts to the drilling hole and centralizes the drill bit (8), stabilizes the drilling direction of the drill bit (8), and uses the MWD wireless while drilling directional device to real-time locate the direction and position of the drill bit (8); Step four, when the drill bit (8) needs to change the running track during horizontal drilling, the drill bit track adjustment system acquires target oil layer data and restriction conditions, uses the LWD sensor module to provide real-time geological information and seismic horizon around the drill bit (8) as a constraint, establishes a stratum model through the Kriging interpolation algorithm, establishes a borehole model through the minimum curvature method algorithm according to the bottom hole position, inclination angle and azimuth angle sequence measured by the MWD wireless while drilling directional device, establishes the stratum and borehole model through the ray-surface intersection algorithm, establishes a mathematical model on the basis of the geological and borehole models to convert the abstract geological steering target into a quantifiable mathematical expression, outputs the optimized objective function and its constraint conditions, inputs the objective function and constraint conditions into the track design algorithm, generates multiple schemes, evaluates the multiple schemes to confirm the final borehole track, decomposes the borehole track into a series of specific operation instructions and inputs them into the MWD wireless while drilling directional device in the flexible screw motor (5), and the MWD wireless while drilling directional device controls the flexible screw motor (5) to change the running track of the drill bit (8) through the bend joint, and automatically calibrates the drill bit (8) during drilling until the drill bit (8) is drilled horizontally to the designed depth; Step five, test the drilled well to ensure that there is no deformation, foreign matter or other obstacles in the well, and if there are, clean the well to remove the obstacles; Step six, open hole, flexible pipe segmented fracturing or flexible screen pipe completion.

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