A shallow ultra-long horizontal well casing with a pulling device and a method of using the same

Abstract

The application discloses a shallow long horizontal well casing with a traction device and a use method thereof. The device comprises a casing and a traction mechanism arranged at the front end of the casing. The traction mechanism comprises a power screw and a transmission worm. The power screw comprises a stator and a rotor rotatably arranged in the stator. The rear end of the transmission worm is connected with the stator and can rotate under the drive of the stator. The transmission worm is meshingly connected with a first caterpillar walking mechanism and a second caterpillar walking mechanism. The first caterpillar walking mechanism and the second caterpillar walking mechanism can move under the drive of the transmission worm. The first caterpillar walking mechanism and the second caterpillar walking mechanism are further connected through a tensioning mechanism. The tensioning mechanism can extend and contract along the radial direction of the transmission worm, and push the first caterpillar arranged in the first caterpillar walking mechanism and the second caterpillar arranged in the second caterpillar walking mechanism to move in the direction of approaching or moving away from the well wall. The device can drive the casing to the bottom of the hole, and has the advantages of simple structure and convenient operation.

Description

Technical Field

[0001] This invention belongs to the field of coalbed methane development technology, specifically relating to a shallow ultra-long horizontal well casing with a traction device and its usage method. Background Technology

[0002] In coal mine backfilling operations, the method of using surface boreholes to connect the goaf and transport backfill slurry allows backfilling operations to proceed in parallel with coal mining without affecting the equipment layout at the coal face, achieving rapid and efficient backfilling. However, if vertical boreholes are used as slurry transport channels, a large number of boreholes are required to cover the goaf (working face), resulting in a large land area and high construction costs. Using ultra-long horizontal wells as slurry transport channels can maximize the coverage of the working face area while reducing the number of well sites and lowering surface engineering costs. However, due to the shallow vertical depth and long horizontal section of the borehole, the downward pressure that can be applied during casing installation is limited, and the high frictional resistance during casing installation makes it difficult to lower the casing to the bottom of the borehole. Therefore, casing installation in ultra-long horizontal wells is a major challenge in drilling engineering. Existing traction-type casing installation devices and methods cannot circulate drilling fluid during the casing installation process, and are inconvenient to handle when the casing encounters obstruction, ultimately preventing the full utilization of the advantages of ultra-long horizontal wells and necessitating improvements. Summary of the Invention

[0003] In view of the defects and deficiencies in the prior art, the present invention provides a shallow ultra-long horizontal well casing with a traction device and a method for using the same, so as to solve the above-mentioned deficiencies in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A shallow ultra-long horizontal well casing with a traction device includes a casing and a traction mechanism disposed at the front end of the casing. The traction mechanism includes a power screw and a transmission worm gear. The power screw includes a stator and a rotor disposed within the stator.

[0006] The rear end of the transmission worm is connected to the stator and can rotate under the drive of the stator; a first tracked walking mechanism and a second tracked walking mechanism are meshed on the transmission worm, and both the first tracked walking mechanism and the second tracked walking mechanism can move under the drive of the transmission worm.

[0007] The first tracked walking mechanism and the second tracked walking mechanism are respectively connected to the stator via traction rods, and the first tracked walking mechanism and the second tracked walking mechanism are also connected via a tensioning mechanism. The tensioning mechanism can extend and retract radially along the transmission worm gear, pushing the first track in the first tracked walking mechanism and the second track in the second tracked walking mechanism to move in a direction closer to or away from the well wall.

[0008] The present invention also has the following technical features:

[0009] Specifically, the tensioning mechanism includes a push cylinder, in which a first piston and a second piston are disposed; a first tension spring is connected to the end of the first piston away from the second piston, and a first track support is connected to the other end of the first tension spring; a second tension spring is connected to the end of the second piston away from the first piston, and a second track support is connected to the other end of the second tension spring; the first track support and the second track support are arranged in a mirror image symmetrically.

[0010] A receiving cavity is formed between the first piston and the second piston. The receiving cavity is connected to a liquid inlet opened on the side wall of the push cylinder. The liquid inlet is connected to a hydraulic pump through a pipeline. The first piston can move radially along the transmission worm under the drive of the hydraulic pump, driving the first track to move closer to or away from the well wall. The second piston can move radially along the transmission worm under the drive of the hydraulic pump, driving the second track to move closer to or away from the well wall.

[0011] Furthermore, the first tracked walking mechanism and the second tracked walking mechanism have the same structure and are arranged in a mirror image symmetrically on both sides of the transmission worm.

[0012] Furthermore, the first tracked walking mechanism includes a first track wheel support frame, the first track is wound around the first track wheel support frame, and the track wheel support frame is provided with a plurality of first track wheels that roll in contact with the first track.

[0013] The second tracked walking mechanism includes a second track wheel support frame, the second track is wound around the second track wheel support frame, and the second track wheel support frame is provided with a plurality of second track wheels that roll in contact with the second track.

[0014] Furthermore, the outer wall of the transmission worm is provided with helical teeth, and the contact surfaces of the first tracked walking mechanism and the second tracked walking mechanism with the transmission worm are each provided with first track teeth that can mesh with the helical teeth.

[0015] Furthermore, the contact surface between the second track and the transmission worm gear is provided with a second track tooth that can mesh with the helical tooth.

[0016] Furthermore, one end of the traction rod is connected to the stator, and the other end is connected to the first tracked walking mechanism or the second tracked walking mechanism.

[0017] Furthermore, the front end of the transmission worm gear is also equipped with a power conversion module and a judgment and decision module, and a pressure sensor is also installed inside the push cylinder;

[0018] The power conversion module is connected to the pressure sensor and the decision-making module respectively; the power conversion module can convert the mechanical energy generated by the rotation of the transmission worm gear into electrical energy, and supply the generated electrical energy to the pressure sensor and the decision-making module.

[0019] The pressure sensor is communicatively connected to the judgment and decision module. The pressure sensor is used to collect the pressure value inside the hydraulic cylinder and transmit the collected pressure value to the judgment and decision module.

[0020] The judgment and decision module can compare the received pressure value with the preset pressure value and send a hydraulic pump start / stop command based on the comparison result.

[0021] This invention also discloses a method for using shallow ultra-long horizontal well casing with a traction device, the method comprising the following steps:

[0022] Step 1: After the shallow ultra-long horizontal well is completed, a well cleaning operation is carried out;

[0023] Step 2: Run the aforementioned shallow ultra-long horizontal well casing with traction device into the shallow ultra-long horizontal well, so that the casing moves downward in the borehole under its own weight; when the friction between the casing and the well wall is greater than or equal to the weight of the casing, inject slurry into the casing to start the traction mechanism, and record the weight of the injected slurry during the grouting process.

[0024] Step 3: During the grouting process, the pressure sensor collects the pressure value inside the push cylinder in real time. When the pressure value inside the push cylinder chamber calculated by the decision-making module is greater than or equal to the pressure value collected in real time by the pressure sensor, the hydraulic pump is started to pump liquid into the hydraulic pump and push the first tracked walking mechanism and the second tracked walking mechanism to move along the wellbore extension direction.

[0025] Step 4: After the traction device reaches the bottom of the well, cement slurry is injected to complete the cementing.

[0026] Compared with the prior art, the beneficial technical effects of this invention are:

[0027] (1) The device of the present invention can ensure that the casing is lowered to the bottom of the hole by setting a traction mechanism at the front end of the casing. Specifically, a tracked walking mechanism is set on the transmission worm. The tracked walking mechanism moves along the extension direction of the well wall under the drive of the transmission worm, providing effective power for the casing to be lowered.

[0028] (2) The device of the present invention achieves frictional contact between the track and the well wall through hydraulic drive in the casing; drilling mud and clean water can be used, and no other auxiliary equipment is required, which has the advantage of being easy to construct.

[0029] (3) The present invention can adjust the tension of the spring by adjusting the amount of liquid pumped into the hydraulic pump, thereby avoiding the problems of excessive tension causing the tracked walking mechanism to damage the hole wall and insufficient tension causing the tracked walking mechanism to be unable to walk due to insufficient friction between the tracked walking mechanism and the hole wall. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0031] Figure 2 This is a partial structural schematic diagram of the device of the present invention;

[0032] Figure 3 This is a schematic diagram showing the interaction between the transmission worm gear and the first tracked walking mechanism;

[0033] Figure 4 This is a schematic diagram of the tensioning mechanism structure in Example 1;

[0034] Figure 5 This is a partial schematic diagram of the first tracked walking mechanism.

[0035] Meaning of the labels in the attached diagram:

[0036] 1-Sleeve, 2-Traction mechanism, 3-Power screw, 4-Transmission worm gear, 5-First tracked walking mechanism, 6-Second tracked walking mechanism, 7-Tensioning mechanism, 8-Traction rod, 9-First track tooth, 10-Second track tooth; 31-Stator, 32-Rotor; 51-First track, 52-First track wheel support frame, 53-First track wheel; 61-Second track, 62-Second track wheel support frame, 63-Second track wheel; 71-Push cylinder, 72-First piston, 73-Second piston, 74-First tension spring, 75-Second tension spring, 76-First track support, 77-Second track support, 78-Accommodation cavity, 79-Hydraulic pump.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0038] Following the above technical solutions, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention. The present invention will be further described in detail below with reference to the embodiments.

[0039] In the description of orientation in this invention, the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate orientation or positional relationships only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Unless otherwise stated, the terms "installed," "connected," "joined," and "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components or an 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.

[0041] The following explains the terminology used in this invention:

[0042] Frictional traction refers to the frictional force generated between the traction mechanism and the well wall that provides traction.

[0043] It should be noted that, unless otherwise specified, all components in this invention are those known in the art.

[0044] Example 1:

[0045] Following the above technical solutions, such as Figures 1 to 3 As shown, this embodiment provides a shallow ultra-long horizontal well casing with a traction device, including a casing 1 and a traction mechanism 2 disposed at the front end of the casing 1. The traction mechanism 2 includes a power screw 3 and a transmission worm gear 4. The power screw 3 includes a stator 31 and a rotor 32 disposed within the stator 31. The stator 31 and the rotor 32 are coaxially sleeved, and the stator 31 and the rotor 32 are clearance-fitted, that is, the rotor 32 is placed inside the stator 31 and rotatably connected to the stator 31. The stator 31 can rotate around its own axis under the drive of the grouting slurry entering the power screw 3.

[0046] like Figure 2As shown, the rear end of the transmission worm 4 is connected to the stator 31 and can rotate under the drive of the stator 31; the upper and lower sides of the front end of the transmission worm 4 are respectively meshed with the first tracked walking mechanism 5 and the second tracked walking mechanism 6. Both the first tracked walking mechanism 5 and the second tracked walking mechanism 6 can move under the drive of the transmission worm 4, thereby realizing the first tracked walking mechanism 5 and the second tracked walking mechanism 6 crawling on the well wall along the extension direction of the well wall;

[0047] The first tracked walking mechanism 5 and the second tracked walking mechanism 6 used in this embodiment 1 are both tracked walking mechanisms that have been disclosed in existing mechanisms.

[0048] The first tracked traveling mechanism 5 and the second tracked traveling mechanism 6 are respectively connected to the stator 31 via the traction rod 8. The first tracked traveling mechanism 5 and the second tracked traveling mechanism 6 are also connected via the tensioning mechanism 7. The tensioning mechanism 7 can extend and retract radially along the transmission worm 4, pushing the first track 51 in the first tracked traveling mechanism 5 and the second track 61 in the second tracked traveling mechanism 6 to move in the direction of approaching or moving away from the well wall, so that the first track 51 and the second track 61 are in frictional contact with the well wall. During the rotation of the transmission worm 4, both the first tracked traveling mechanism 5 and the second tracked traveling mechanism 6 can roll into contact with the well wall of the shallow ultra-long horizontal well.

[0049] In a preferred embodiment, the tensioning mechanism 7 includes a push cylinder 71, within which a first piston 72 and a second piston 73 are disposed. When the push cylinder 71 rotates forward, liquid is injected into the cylinder cavity, causing the ends of the first piston 72 and the second piston 73 away from the first piston 72 to extend out of the push cylinder 71. When the push cylinder 71 rotates in reverse, the hydraulic pump 79 extracts the liquid from the cavity, causing the first piston 72 and the second piston 73 to retract into the push cylinder 71. A first tension spring 74 is connected to the end of the first piston 72 away from the second piston 73, and a first track support 76 is connected to the other end of the first tension spring 74. The second piston 73 is located away from the first piston 72. One end is connected to a second tension spring 75, and the other end of the second tension spring 75 is connected to a second track support 77. The first track support 76 and the second track support 77 are arranged in a mirror image symmetrically. In this embodiment, both the first track support 76 and the second track support 77 are cylindrical, and the outer wall of the first track support 76 can contact the inner surface of the first track 51, and the outer wall of the second track support 77 can contact the inner surface of the second track 61. The shapes of the first track support 76 and the second track support 77 can also be selected according to the actual working conditions, as long as it is ensured that the first track support 76 can contact the first track 51 under the action of thrust, and the second track support 77 can contact the second track 61 under the action of thrust.

[0050] A receiving cavity 78 is formed between the first piston 72 and the second piston 73. The receiving cavity 78 is connected to a liquid inlet on the side wall of the push cylinder 71. The liquid inlet is connected to a hydraulic pump 79 via a pipeline. After the hydraulic pump 79 is started and liquid is injected into the receiving cavity 78, the first piston 72 can move radially along the transmission worm 4, driving the first track 51 to approach the well wall. At the same time, the second piston 73 can move radially along the transmission worm 4, driving the second track 61 to approach the well wall. This makes the first track 51 and the second track 61 fit against the well wall, so as to avoid the first track walking mechanism 5 and the second track walking mechanism 6 slipping relative to the well wall due to the irregularity of the well wall, which would prevent the casing from moving smoothly.

[0051] As a preferred embodiment, the first tracked walking mechanism 5 and the second tracked walking mechanism 6 have the same structure and are arranged in a mirror image symmetrically on both sides of the transmission worm gear 4.

[0052] As a preferred embodiment, the first tracked walking mechanism 5 includes a first track wheel support frame 52, a first track 51 is wound around the first track wheel support frame 52, and a plurality of first track wheels 53 are provided on the track wheel support frame 52 to roll in contact with the first track 51. The first track wheels 53 at least partially abut against the first track 51.

[0053] The second tracked walking mechanism 6 includes a second track wheel support frame 62, a second track 61 is wound around the second track wheel support frame 62, and a plurality of second track wheels 63 are provided on the second track wheel support frame 62 to roll in contact with the second track 61. The second track wheels 63 at least partially abut against the second track 61.

[0054] As a preferred embodiment, the outer wall of the transmission worm 4 is provided with helical teeth, and the contact surface between the first track 51 and the transmission worm 4 is provided with first track teeth 9 that can mesh with the helical teeth. When the transmission worm 4 rotates, it can drive the first track 51 that meshes with it to move.

[0055] As a preferred embodiment, the contact surface between the second track 61 and the transmission worm 4 is provided with a second track tooth 10 that can mesh with the helical tooth. When the transmission worm 4 rotates, it can drive the second track 61 that meshes with it to move. During the rotation, the first track-type walking mechanism 5 and the second track-type walking mechanism maintain rolling friction with the well wall by means of the first track tooth 9 and the second track tooth 10.

[0056] In a preferred embodiment, one end of the traction rod 8 is connected to the stator 31, and the other end is connected to the first tracked walking mechanism 5 or the second tracked walking mechanism 6. The traction rod 8 is used to prevent the first tracked walking mechanism 5 or the second tracked walking mechanism 6 from disengaging from the transmission screw 4.

[0057] As a preferred embodiment, the front end of the transmission worm gear 4 is also provided with a power conversion module 10 and a judgment and decision module 11, and a pressure sensor is also provided inside the push cylinder 71.

[0058] The power conversion module 110 is connected to the pressure sensor and the judgment and decision module 11 respectively; the power conversion module 12 can convert the mechanical energy generated by the rotation of the transmission worm 4 into electrical energy, and supply the generated electrical energy to the pressure sensor and the judgment and decision module 11.

[0059] The pressure sensor is connected to the decision-making module 11. The pressure sensor is used to collect the pressure value inside the hydraulic cylinder 71 and transmit the collected pressure value to the decision-making module 11.

[0060] The judgment and decision module 11 can compare the received pressure value with the preset pressure value and send a hydraulic pump start / stop command based on the comparison result.

[0061] Example 2

[0062] A mine's backfilling process utilizes a long horizontal well with a vertical section of 500 meters. Due to the casing installation, the designed horizontal section length is 500 meters, with a borehole depth of 1400 meters. The working face length is 2000 meters. Using existing technology, four horizontal wells would need to be constructed sequentially to cover the working face length. However, by designing the horizontal section length to 1000 meters and the borehole depth to 1900 meters, only two horizontal wells need to be constructed sequentially to cover the working face length.

[0063] This embodiment discloses a method for using the shallow ultra-long horizontal well casing with a traction device provided in Embodiment 1, including the following steps:

[0064] Step 1: Select the drilling location based on the preliminary exploration results, then construct a shallow ultra-long horizontal well, and perform well cleaning and flushing operations after drilling is completed.

[0065] Step 2: Run the shallow ultra-long horizontal well casing with traction device provided in Example 1 into the shallow ultra-long horizontal well, so that the casing moves down in the borehole under its own weight, and monitor the descent process of the casing on the ground.

[0066] When the frictional resistance between the casing and the well wall is greater than or equal to the weight of the casing, the casing is difficult to continue to be lowered and the hanging weight at the wellhead is 0 tons. At this time, grout is injected into the casing to start the traction mechanism, and the weight of the injected grout is recorded during the grouting process.

[0067] In this embodiment, the casing's own weight is G. Liquid is pumped into the casing, generating a liquid gravity G1. The traction device is activated, and the rotor drives the worm gear to start rotating. At the same time, it drives the first tracked walking mechanism and the second tracked walking mechanism to move along the wellbore extension direction. The frictional traction force generated by the first track and the second track moving forward against the well wall is F2. When G+G1+F2>F1 (F1 is the frictional resistance encountered by the casing during lowering), the suspended weight display is greater than 0 tons, and the casing can continue to be lowered.

[0068] Step 3: During the grouting process, the pressure sensor collects the pressure value inside the push cylinder in real time. When the pressure value inside the push cylinder chamber calculated by the decision-making module is greater than or equal to the pressure value collected in real time by the pressure sensor, the hydraulic pump is started to pump liquid into the hydraulic pump and push the first tracked walking mechanism and the second tracked walking mechanism to move along the wellbore extension direction.

[0069] Specifically, it includes:

[0070] As the casing continues to be lowered, the required track movement generates a frictional traction force F2 against the well wall, where F2 = F1 - G - G1;

[0071] Calculate the hydraulic cylinder thrust F3 required to provide traction force F2, F3 = F2 / f, where f is the coefficient of friction between the track and the well wall;

[0072] Calculate the pressure P required to push the cylinder cavity to provide F3, F3 = P * S, where S is the cross-sectional area of ​​the cylinder cavity.

[0073] The calculated pressure value P in the cylinder chamber is compared with the pressure P1 measured by the pressure sensor in the hydraulic chamber.

[0074] When P1≤P, the hydraulic pump is activated to pump liquid into the hydraulic chamber, increasing the pressure P1 in the hydraulic chamber to be greater than the calculated pressure P. This pushes the cylinder, increasing the thrust F3, and increasing the frictional traction F2 generated between the track and the well wall, so that G+G1+F2>F1, allowing the casing to continue to be lowered.

[0075] When P1 > P, the hydraulic pump does not need to operate.

[0076] Step 4: After the traction device reaches the bottom of the well, cement slurry is injected to complete the cementing process;

[0077] Compared with existing methods, this embodiment reduces drilling workload by 35.7%, well site land acquisition and construction by 50%, the number of pump stations used for filling by 50%, and the number of filling management, construction and management personnel by 50%, demonstrating significant technical and economic advantages.

[0078] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0079] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0080] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content invented by this disclosure.

Claims

1. A shallow, ultra-long horizontal well casing with a traction device, comprising a casing (1) and a traction mechanism (2) disposed at the front end of the casing (1), characterized in that, The traction mechanism (2) includes a power screw (3) and a transmission worm (4). The power screw (3) includes a stator (31) and a rotor (32) disposed in the stator (31). The rear end of the transmission worm (4) is connected to the stator (31) and can rotate under the drive of the stator (31); a first tracked walking mechanism (5) and a second tracked walking mechanism (6) are meshed on the transmission worm (4), and both the first tracked walking mechanism (5) and the second tracked walking mechanism (6) can move under the drive of the transmission worm (4). The first tracked walking mechanism (5) and the second tracked walking mechanism (6) are respectively connected to the stator (31) via a traction rod (8); the first tracked walking mechanism (5) and the second tracked walking mechanism (6) are also connected via a tensioning mechanism (7), which can extend and retract radially along the transmission worm (4) to push the first track (51) in the first tracked walking mechanism (5) and the second track (61) in the second tracked walking mechanism (6) to move in the direction of approaching or moving away from the well wall; The tensioning mechanism (7) includes a push cylinder (71), in which a first piston (72) and a second piston (73) are disposed; a first tension spring (74) is connected to one end of the first piston (72) away from the second piston (73), and a first track support member (76) is connected to the other end of the first tension spring (74); a second tension spring (75) is connected to one end of the second piston (73) away from the first piston (72), and a second track support member (77) is connected to the other end of the second tension spring (75); the first track support member (76) and the second track support member (77) are arranged in a mirror symmetrical manner; A receiving cavity (78) is formed between the first piston (72) and the second piston (73). The receiving cavity (78) is connected to the liquid inlet on the side wall of the push cylinder (71). The liquid inlet is connected to the hydraulic pump (79) via a pipeline. The first piston (72) can move radially along the transmission worm (4) under the drive of the hydraulic pump (79), driving the first track (51) to approach or move away from the well wall. The second piston (73) can move radially along the transmission worm (4) under the drive of the hydraulic pump (79), driving the second track (61) to approach or move away from the well wall. The front end of the transmission worm (4) is also provided with a power conversion module and a judgment and decision module, and the push cylinder (71) is also provided with a pressure sensor; The power conversion module is connected to the pressure sensor and the judgment and decision module respectively; the power conversion module can convert the mechanical energy generated by the rotation of the transmission worm (4) into electrical energy and supply the generated electrical energy to the pressure sensor and the judgment and decision module; The pressure sensor is communicatively connected to the judgment and decision module. The pressure sensor is used to collect the pressure value inside the push cylinder (71) and transmit the collected pressure value to the judgment and decision module. The judgment and decision module can compare the received pressure value with the preset pressure value and send a hydraulic pump start / stop command based on the comparison result.

2. The shallow ultra-long horizontal well casing with traction device as described in claim 1, characterized in that, The first tracked walking mechanism (5) and the second tracked walking mechanism (6) have the same structure and are arranged in a mirror image symmetrically on both sides of the transmission worm (4).

3. The shallow ultra-long horizontal well casing with traction device as described in claim 1, characterized in that, The first tracked walking mechanism (5) includes a first track wheel support frame (52), the first track (51) is wound around the first track wheel support frame (52), and the first track wheel support frame (52) is provided with a plurality of first track wheels (53) that roll in contact with the first track (51). The second tracked walking mechanism (6) includes a second track wheel support frame (62), the second track (61) is wound around the second track wheel support frame (62), and the second track wheel support frame (62) is provided with a plurality of second track wheels (63) that roll in contact with the second track (61).

4. The shallow ultra-long horizontal well casing with traction device as described in claim 3, characterized in that, The outer wall of the transmission worm (4) is provided with helical teeth, and the contact surface between the first track (51) and the transmission worm (4) is provided with a first track tooth (9) that can mesh with the helical teeth.

5. The shallow ultra-long horizontal well casing with traction device as described in claim 4, characterized in that, The second track (61) has a second track tooth (10) on the contact surface with the transmission worm (4) that can mesh with the helical tooth.

6. A method for using a shallow, ultra-long horizontal well casing with a traction device, the method comprising the following steps: Step 1: After the shallow ultra-long horizontal well is completed, a well cleaning operation is carried out; Step 2: Run the shallow ultra-long horizontal well casing with a traction device as described in any one of claims 1 to 5 into the shallow ultra-long horizontal well, so that the casing moves down in the borehole under its own weight; when the friction between the casing and the well wall is greater than or equal to the weight of the casing, inject slurry into the casing to start the traction mechanism, and record the weight of the injected slurry during the grouting process. Step 3: During the grouting process, the pressure sensor collects the pressure value inside the push cylinder in real time. When the pressure value inside the push cylinder chamber calculated by the decision-making module is greater than or equal to the pressure value collected in real time by the pressure sensor, the hydraulic pump is started to pump liquid into the hydraulic pump and push the first tracked walking mechanism and the second tracked walking mechanism to move along the wellbore extension direction. Step 4: After the traction device reaches the bottom of the well, cement slurry is injected to complete the cementing.

Images