Shallow-layer super-long horizontal well casing pipe with traction device and using method thereof

Abstract

The invention discloses a shallow super-long horizontal well casing pipe with a traction device and a using method thereof.The device comprises a casing pipe body and a traction mechanism arranged at the front end of the casing pipe body, the traction mechanism comprises a power screw and a transmission worm, and the power screw comprises a stator and a rotor rotationally arranged in the stator; the rear end of the transmission worm is connected with the stator and can be driven by the stator to rotate. The transmission worm is connected with a first crawler-type walking mechanism and a second crawler-type walking mechanism in a meshed mode, and the first crawler-type walking mechanism and the second crawler-type walking mechanism can be driven by the transmission worm to move. The first crawler-type walking mechanism and the second crawler-type walking mechanism are further connected through a tensioning mechanism, and the tensioning mechanism can stretch out and draw back in the radial direction of the transmission worm to push a first crawler arranged in the first crawler-type walking mechanism and a second crawler arranged in the second crawler-type walking mechanism to move in the direction close to or away from the well wall. The device can drive the casing pipe to descend to the hole bottom, and is simple in structure and convenient to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of coalbed methane development, and in particular relates to a shallow ultra-long horizontal well casing with a traction device and a use method thereof. Background Art

[0002] In the filling mining operation of coal mines, the operation mode of conveying filling slurry through the ground drilling to the goaf can make the filling operation parallel to the coal mining without affecting the equipment layout of the coal mining face, so as to achieve the purpose of fast and efficient filling. Among them, if the vertical hole is used as the slurry delivery channel, then in order to cover the goaf (working face), a large number of boreholes need to be constructed, which has the defects of large floor space and high construction cost; if the ultra-long horizontal section horizontal well is used as the slurry delivery channel, it can cover the working face area to the greatest extent while reducing the well site setting, and reduce the construction ground engineering cost. However, due to the small vertical depth of the borehole and the long horizontal section, the downward pressure that can be applied when the casing is lowered is limited, the friction resistance of the casing is large, and the casing is difficult to lower to the bottom of the hole. Therefore, the casing lowering of the ultra-long horizontal section horizontal well is a difficult problem faced by the drilling project, and the existing traction type casing lowering device and method cannot realize the circulation of drilling fluid in the auxiliary casing lowering process, and it is inconvenient to handle when the casing is blocked, which ultimately leads to the inability to give full play to the advantages of the ultra-long horizontal section horizontal well, which is in urgent need of improvement. Summary of the invention

[0003] In view of the defects and shortcomings in the prior art, the present invention provides a shallow ultra-long horizontal well casing with a traction device and a use method thereof to solve the above-mentioned shortcomings of the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] A shallow ultra-long horizontal well casing with a traction device, comprising a casing and a traction mechanism arranged at the front end of the casing, the traction mechanism comprising a power screw and a transmission worm, the power screw comprising a stator and a rotor arranged in the stator;

[0006] The rear end of the transmission worm is connected to the stator and can rotate under the drive of the stator; the transmission worm is meshed with a first crawler-type walking mechanism and a second crawler-type walking mechanism, and both the first crawler-type walking mechanism and the second crawler-type walking mechanism can move under the drive of the transmission worm;

[0007] The first crawler-type walking mechanism and the second crawler-type walking mechanism are respectively connected to the stator through a traction rod, and the first crawler-type walking mechanism and the second crawler-type walking mechanism are also connected through a tensioning mechanism. The tensioning mechanism can extend and retract radially along the transmission worm to push the first crawler arranged in the first crawler-type walking mechanism and the second crawler arranged in the second crawler walking mechanism to move in a direction close to or away from the well wall.

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

[0009] Specifically, the tensioning mechanism includes a pushing oil cylinder, in which a first piston and a second piston are arranged; one end of the first piston away from the second piston is connected to a first tensioning spring, and the other end of the first tensioning spring is connected to a first track support; one end of the second piston away from the first piston is connected to a second tensioning spring, and the other end of the second tensioning spring is connected to a second track support; the first track support and the second track support are arranged in mirror symmetry;

[0010] A accommodating chamber is formed between the first piston and the second piston, and the accommodating chamber is communicated with a liquid inlet opened on the side wall of the pushing 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 crawler track to approach or move 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 crawler track to approach or move away from the well wall.

[0011] Furthermore, the first crawler-type walking mechanism and the second crawler-type walking mechanism have the same structure and are arranged on both sides of the transmission worm in a mirror-symmetrical manner.

[0012] Furthermore, the first crawler-type walking mechanism comprises a first crawler wheel support frame, the first crawler is wound around the first crawler wheel support frame, and the wheel support frame is provided with a plurality of first crawler wheels in rolling contact with the first crawler;

[0013] The second crawler-type walking mechanism comprises a second crawler wheel support frame, the second crawler is wound around the second crawler wheel support frame, and the second crawler wheel support frame is provided with a plurality of second crawler wheels in rolling contact with the second crawler.

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

[0015] Furthermore, second track teeth capable of meshing and connecting with the helical teeth are arranged on the contact surface between the second track and the transmission worm.

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

[0017] Furthermore, a power conversion module and a judgment and decision module are also provided at the front end of the transmission worm, and a pressure sensor is also provided in the pushing cylinder;

[0018] 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 into electrical energy, and supply the generated electrical energy to the pressure sensor and the judgment and decision module;

[0019] The pressure sensor is in communication connection with the judgment and decision module, and the pressure sensor is used to collect the pressure value in the pushing 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 and stop instruction according to the comparison result.

[0021] The present invention also discloses a method for using a 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 drilled, a well cleaning operation is performed;

[0023] Step 2, lowering the above-mentioned shallow ultra-long horizontal well casing with a traction device into the shallow ultra-long horizontal well, and allowing the casing to descend in the borehole under the action of its own weight; when the friction between the casing and the well wall is greater than or equal to the casing's own weight, injecting slurry into the casing to start the traction mechanism, and recording the weight of the injected slurry during the grouting process;

[0024] Step 3: During the grouting process, the pressure sensor collects the pressure value in the pushing cylinder in real time, and when the pressure value in the pushing cylinder cavity calculated by the judgment decision 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 to push the first crawler walking mechanism and the second crawler walking mechanism to move along the extension direction of the wellbore;

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

[0026] Compared with the prior art, the present invention has the following beneficial technical effects:

[0027] (1) The device of the present invention performs casing lowering construction by arranging a traction mechanism at the front end of the casing, which can ensure that the casing is lowered to the bottom of the hole. Specifically, a crawler-type walking mechanism is arranged on the transmission worm, and the crawler-type walking mechanism moves along the extension direction of the well wall under the drive of the transmission worm, thereby providing effective power for the lowering of the casing.

[0028] (2) The device of the present invention is driven by hydraulic force in the casing to achieve frictional contact between the crawler and the well wall; drilling mud and clean water are sufficient, 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 problem that the crawler walking mechanism damages the hole wall due to excessive tension and the crawler walking mechanism cannot move due to insufficient friction between the crawler walking mechanism and the hole wall due to insufficient tension. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0032] Figure 3 It is a schematic diagram of the cooperation between the transmission worm and the first crawler-type walking mechanism;

[0033] Figure 4 It is a structural schematic diagram of the tensioning mechanism of Example 1;

[0034] Figure 5 It is a partial schematic diagram of the first crawler-type walking mechanism.

[0035] Meaning of the numbers in the attached drawings:

[0036] 1- casing, 2- traction mechanism, 3- power screw, 4- transmission worm, 5- first crawler type walking mechanism, 6- second crawler type walking mechanism, 7- tensioning mechanism, 8- traction rod, 9- first crawler teeth, 10- second crawler teeth; 31- stator, 32- rotor; 51- first crawler, 52- first crawler wheel support frame, 53- first crawler wheel; 61- second crawler, 62- second crawler wheel support frame, 63- second crawler wheel; 71- pushing cylinder, 72- first piston, 73- second piston, 74- first tensioning spring, 75- second tensioning spring, 76- first crawler support, 77- second crawler support, 78- accommodating chamber, 79- hydraulic pump.

[0037] The present invention is described in detail below with reference to the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0038] In accordance with the above technical solution, the following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention. The present invention is further described in detail below in conjunction with the embodiments.

[0039] When describing the orientation of the present invention, the orientation or positional relationship indicated by terms such as "up", "down", "front", "back", "left" and "right" are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Unless otherwise specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0041] The following explains the terms involved in the present invention:

[0042] Frictional traction refers to the frictional force formed between the traction mechanism and the well wall that can provide traction.

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

[0044] Embodiment 1:

[0045] Following the above technical solution, 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 arranged at the front end of the casing 1, 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 arranged in the stator 31; the stator 31 and the rotor 32 are coaxially sleeved, and the stator 31 and the rotor 32 are clearance-matched, that is, the rotor 32 is placed inside the stator 31 and is 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 and connected with the first crawler walking mechanism 5 and the second crawler walking mechanism 6, and the first crawler walking mechanism 5 and the second crawler walking mechanism 6 can move under the drive of the transmission worm 4, thereby realizing the first crawler walking mechanism 5 and the second crawler walking mechanism 6 crawling on the well wall along the extension direction of the well wall;

[0047] The first crawler-type traveling mechanism 5 and the second crawler-type traveling mechanism 6 used in the present embodiment 1 are both crawler-type traveling mechanisms that have been disclosed in the existing mechanisms.

[0048] The first crawler-type walking mechanism 5 and the second crawler-type walking mechanism 6 are respectively connected to the stator 31 through the traction rod 8, and the first crawler-type walking mechanism 5 and the second crawler-type walking mechanism 6 are also connected through the tensioning mechanism 7. The tensioning mechanism 7 can be radially extended and retracted along the transmission worm 4 to push the first crawler 51 arranged in the first crawler-type walking mechanism 5 and the second crawler 61 arranged in the second crawler-type walking mechanism 6 to move in the direction close to or away from the well wall, so that the first crawler 51 and the second crawler 61 are frictionally matched with the well wall. During the rotation of the transmission worm 4, the first crawler-type walking mechanism 5 and the second crawler walking mechanism 6 can both roll in contact with the well wall of the shallow ultra-long horizontal well.

[0049] As a preferred solution of this embodiment, the tensioning mechanism 7 includes a pushing cylinder 71, in which a first piston 72 and a second piston 73 are arranged. When the pushing cylinder 71 rotates forward, liquid is injected into the inner cavity of the cylinder, so that one end of the first piston 72 away from the second piston 73 and one end of the second piston 73 away from the first piston 72 extend out of the pushing cylinder 71 respectively. When the pushing cylinder 71 reverses, the hydraulic pump 79 can extract the liquid in the inner cavity, so that the first piston 72 and the second piston 73 are retracted into the pushing cylinder 71; one end of the first piston 72 away from the second piston 73 is connected to a first tensioning spring 74, and the other end of the first tensioning spring 74 is connected to a first crawler support 76; the second piston 73 away from the first piston 72 One end is connected to a second tensioning spring 75, and the other end of the second tensioning spring 75 is connected to a second track support member 77; the first track support member 76 and the second track support member 77 are arranged in a mirror-symmetrical manner. In this embodiment, the first track support member 76 and the second track support member 77 are both cylindrical, and the outer wall of the first track support member 76 can contact the inner surface of the first track 51, and the outer wall of the second track support member 77 can contact the inner surface of the second track 61. The shapes of the first track support member 76 and the second track support member 77 can also be selected according to actual working conditions, as long as it is ensured that the first track support member 76 can contact the first track 51 under the action of thrust, and the second track support member 77 can contact the second track 61 under the action of thrust.

[0050] An accommodating chamber 78 is formed between the first piston 72 and the second piston 73. The accommodating chamber 78 is communicated with a liquid inlet provided on the side wall of the pushing cylinder 71. The liquid inlet is connected to a hydraulic pump 79 via a pipeline. After the hydraulic pump 79 is started to inject liquid into the accommodating chamber 78, the first piston 72 can move radially along the transmission worm 4, driving the first crawler 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 crawler 61 to approach the well wall, so that the first crawler 51 and the second crawler 61 fit the well wall, so as to avoid the first crawler walking mechanism 5 and the second crawler walking mechanism 6 slipping relative to the well wall due to the irregularity of the well wall, and failing to smoothly drive the casing to move.

[0051] As a preferred solution of this embodiment, the first crawler-type walking mechanism 5 and the second crawler-type walking mechanism 6 have the same structure and are arranged on both sides of the driving worm 4 in a mirror-symmetrical manner.

[0052] As a preferred solution of this embodiment, the first crawler-type walking mechanism 5 includes a first crawler wheel support frame 52, the first crawler 51 is wound around the first crawler wheel support frame 52, and the wheel support frame 52 is provided with a plurality of first crawler wheels 53 that are in rolling contact with the first crawler 51, and the first crawler wheels 53 are at least partially in contact with the first crawler 51;

[0053] The second crawler walking mechanism 6 includes a second crawler wheel support frame 62, on which the second crawler 61 is wound. The second crawler wheel support frame 62 is provided with a plurality of second crawler wheels 63 in rolling contact with the second crawler 61, and the second crawler wheels 63 at least partially abut against the second crawler 61.

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

[0055] As a preferred solution of this embodiment, second track teeth 10 that can be meshed with spiral teeth are provided on the contact surface between the second track 61 and the transmission worm 4. When the transmission worm 4 rotates, the second track 61 meshed with it can be driven to move. During the rotation process, the first crawler walking mechanism 5 and the second crawler walking mechanism maintain rolling friction with the well wall with the help of the first crawler teeth 9 and the second crawler teeth 10.

[0056] As a preferred solution of this embodiment, one end of the traction rod 8 is connected to the stator 31, and the other end is connected to the first crawler-type walking mechanism 5 or the second crawler-type walking mechanism 6. The traction rod 8 is used to prevent the first crawler-type walking mechanism 5 or the second crawler-type walking mechanism 6 from being disengaged from the transmission screw 4.

[0057] As a preferred solution of this embodiment, a power conversion module 10 and a judgment and decision module 11 are further provided at the front end of the transmission worm 4, and a pressure sensor is further provided in the pushing 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 in communication connection with the judgment and decision module 11, and the pressure sensor is used to collect the pressure value in the pushing cylinder 71 and transmit the collected pressure value to the judgment and decision 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 and stop instruction according to the comparison result.

[0061] Example 2

[0062] A mine uses a long horizontal well with a vertical length of 500 meters. Affected by the casing, the horizontal section length is designed to be 500 meters, the hole depth is 1400 meters, and the working face length is 2000 meters. If the existing technology is used, 4 horizontal wells need to be constructed in sequence to cover the working face length. The horizontal section length is designed to be 1000 meters, the hole depth is 1900, and 2 horizontal wells can be constructed in sequence to cover the working face length.

[0063] This embodiment discloses a method for using a shallow ultra-long horizontal well casing with a traction device provided in Embodiment 1, comprising 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 operations after drilling;

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

[0066] When the friction resistance between the casing and the well wall is greater than or equal to the casing's own weight, the casing is difficult to continue to be lowered, and the wellhead hanging weight is displayed as 0 tons. At this time, slurry is injected into the casing to start the traction mechanism, and the weight of the injected slurry is recorded during the grouting process;

[0067] In this embodiment, the casing weight is G, and liquid is pumped into the casing to generate liquid gravity G1 in the casing. The traction device is started, and the rotor drives the worm to start rotating, and at the same time drives the first crawler-type walking mechanism and the second crawler-type walking mechanism to move along the extension direction of the wellbore. The friction traction force generated by the first crawler and the second crawler and the well wall is F2. When G+G1+F2>F1 (F1 is the friction resistance encountered by the casing during lowering), the suspended weight is displayed to be 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 in the pushing cylinder in real time, and when the pressure value in the pushing cylinder cavity calculated by the judgment decision 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 to push the first crawler walking mechanism and the second crawler walking mechanism to move along the extension direction of the wellbore;

[0069] Specifically include:

[0070] The crawler required for the casing to continue to run forward generates frictional traction F2 with the well wall, F2 = F1-G-G1

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

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

[0073] Compare the calculated pressure value P in the push cylinder cavity with the pressure P1 measured by the pressure sensor in the hydraulic cavity.

[0074] When P1≤P, start the hydraulic pump to pump liquid into the hydraulic chamber, increase the pressure P1 in the hydraulic chamber to be greater than the calculated pressure P, push the oil cylinder, increase the thrust F3, increase the friction traction F2 between the track and the well wall, so that G+G1+F2>F1, and the casing can 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, inject cement slurry to complete the cementing

[0077] Compared with the existing method, in this embodiment, the drilling workload is reduced by 35.7%, the land acquisition and construction of the well site are reduced by 50%, the pump stations used for filling are reduced by 50%, and the filling management construction and management personnel are reduced by 50%, which has obvious technical and economic advantages.

[0078] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present 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, the present disclosure will not further describe various possible combinations.

[0080] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the content invented by the present disclosure.

Claims

1. A shallow ultra-long horizontal well casing with a traction device, comprising a casing (1) and a traction mechanism (2) arranged at the front end of the casing (1), characterized in that: The traction mechanism (2) comprises a power screw (3) and a transmission worm (4); the power screw (3) comprises a stator (31) and a rotor (32) arranged 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); the transmission worm (4) is meshingly connected with a first crawler-type walking mechanism (5) and a second crawler-type walking mechanism (6), and both the first crawler-type walking mechanism (5) and the second crawler-type walking mechanism (6) can move under the drive of the transmission worm (4); The first crawler-type walking mechanism (5) and the second crawler-type walking mechanism (6) are respectively connected to the stator (31) via a traction rod (8); the first crawler-type walking mechanism (5) and the second crawler-type walking mechanism (6) are also connected via a tensioning mechanism (7); the tensioning mechanism (7) can be extended and retracted along the radial direction of the transmission worm (4) to push the first crawler (51) provided in the first crawler-type walking mechanism (5) and the second crawler (61) provided in the second crawler-type walking mechanism (6) to move in a direction close to or away from the well wall.

2. The shallow ultra-long horizontal well casing with a traction device according to claim 1, characterized in that: The tensioning mechanism (7) comprises a pushing cylinder (71), wherein a first piston (72) and a second piston (73) are arranged in the pushing cylinder (71); an end of the first piston (72) away from the second piston (73) is connected to a first tensioning spring (74), and the other end of the first tensioning spring (74) is connected to a first track support (76); an end of the second piston (73) away from the first piston (72) is connected to a second tensioning spring (75), and the other end of the second tensioning 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-symmetrical manner; An accommodating chamber (78) is formed between the first piston (72) and the second piston (73), and the accommodating chamber (78) is communicated with a liquid inlet provided on the side wall of the pushing cylinder (71), and the liquid inlet is connected to a 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), thereby driving the first crawler (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), thereby driving the second crawler (61) to approach or move away from the well wall.

3. The shallow ultra-long horizontal well casing with a traction device according to claim 1, characterized in that: The first crawler-type walking mechanism (5) and the second crawler-type walking mechanism (6) have the same structure and are arranged on both sides of the transmission worm (4) in a mirror-symmetrical manner.

4. The shallow ultra-long horizontal well casing with a traction device according to claim 1, characterized in that: The first crawler-type walking mechanism (5) comprises a first crawler wheel support frame (52), the first crawler (51) is wound around the first crawler wheel support frame (52), and the wheel support frame (52) is provided with a plurality of first crawler wheels (53) in rolling contact with the first crawler (51); The second crawler-type walking mechanism (6) comprises a second crawler wheel support frame (62), the second crawler (61) is wound around the second crawler wheel support frame (62), and the second crawler wheel support frame (62) is provided with a plurality of second crawler wheels (63) in rolling contact with the second crawler (61).

5. The shallow ultra-long horizontal well casing with a traction device according to 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 crawler (51) and the transmission worm (4) is provided with first crawler teeth (9) that can mesh with the helical teeth.

6. The shallow ultra-long horizontal well casing with a traction device according to claim 5, characterized in that: A second crawler tooth (10) capable of meshing with the helical teeth is provided on the contact surface between the second crawler belt (61) and the transmission worm (4).

7. The shallow ultra-long horizontal well casing with a traction device according to claim 1, characterized in that: One end of the traction rod (8) is connected to the stator (31), and the other end is connected to the first crawler-type walking mechanism (5) or the second crawler-type walking mechanism (6).

8. The shallow ultra-long horizontal well casing with a traction device according to claim 1, characterized in that: The front end of the transmission worm (4) is also provided with a power conversion module (10) and a judgment and decision module (11), and the pushing cylinder (71) is also provided with a pressure sensor; The power conversion module (110) is connected to the pressure sensor and the judgment and decision module (11) respectively; the power conversion module (12) is capable of converting mechanical energy generated by the rotation of the transmission worm (4) into electrical energy, and supplying the generated electrical energy to the pressure sensor and the judgment and decision module (11); The pressure sensor is in communication connection with the judgment and decision module (11), and the pressure sensor is used to collect the pressure value in the pushing cylinder (71) and transmit the collected pressure value to the judgment and decision module (11); The judgment and decision module (11) is capable of comparing the received pressure value with a preset pressure value, and sending a hydraulic pump start / stop instruction according to the comparison result.

9. 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 drilled, a well cleaning operation is performed; Step 2, lowering a shallow ultra-long horizontal well casing with a traction device as described in any one of claims 1 to 8 into a shallow ultra-long horizontal well, and allowing the casing to descend in the borehole under the action of its own weight; when the friction between the casing and the well wall is greater than or equal to the casing's own weight, injecting slurry into the casing to start the traction mechanism, and recording the weight of the injected slurry during the grouting process; Step 3: During the grouting process, the pressure sensor collects the pressure value in the pushing cylinder in real time, and when the pressure value in the pushing cylinder cavity calculated by the judgment decision 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 to push the first crawler walking mechanism and the second crawler walking mechanism to move along the extension direction of the wellbore; Step 4: After the traction device reaches the bottom of the well, inject cement slurry to complete the cementing.

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