A long horizontal section drill and grind tool and drill and grind process

Abstract

Long horizontal section drill grinding tool and drill grinding process relate to the technical field of oilfield downhole tools, including peristaltic pipe column, peristaltic pipe column includes A type peristaltic joint and B type peristaltic joint, A type peristaltic joint and B type peristaltic joint are alternately inserted in series in conventional pipe column in proper order;A type peristaltic joint and B type peristaltic joint all respectively include outer tube, center tube, piston, slip, slip push ring, telescopic pipe and end ring;Center tube is fixedly connected with outer tube and there is annular cavity between the two, telescopic pipe is slidingly sealed in annular cavity, piston, slip push ring and slip are sequentially arranged in annular cavity above telescopic pipe, window is opened in outer tube for slip expansion, lower end of telescopic pipe is extended outside end ring, compression spring is arranged between slip push ring and piston, center tube is provided with pressure transmission hole, and telescopic pipe of B type peristaltic joint in initial state is limited by limiting block.After going downhole, by sending pressure and withdrawing pressure to pipe column, the alternating downward peristalsis of pipe column is realized, and the friction of alternating downward is reduced to half of the original.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling equipment technology, and particularly relates to a long horizontal section drilling tool and drilling process. Background Technology

[0002] In oil and gas field development, multi-stage fracturing allows for the simultaneous stimulation of reservoirs at different locations, increasing single-well oil and gas production capacity while maintaining high efficiency. In multi-stage fracturing, bridge plugs are used to separate the stages before fracturing is performed sequentially from bottom to top. After all stages are completed, the bridge plugs need to be removed by drilling to open the wellbore and enable oil and gas extraction. Compared to vertical wells, bridge plug removal in horizontal wells is more difficult, especially in horizontal wells with extremely long horizontal sections (>3000m). This is because the frictional resistance between the drill string and the wellbore in the horizontal section is greater than the weight of the drill string in the vertical section, making it difficult for the drill string and drilling tools to reach the bridge plug location for operation. The longer the horizontal section, the greater the frictional resistance, and the more difficult it is to advance the drill string. Summary of the Invention

[0003] To address the problem of difficulty in lowering the drilling string to the intended position in long horizontal wells, this invention provides a drilling tool and process for long horizontal sections. First, when the drilling string is difficult to lower, the invention uses internal hydraulic pressure as the driving force. The hydraulic pressure drives adjacent pipe sections to alternately creep downwards. The frictional resistance that needs to be overcome during the alternating creeping process is reduced by half, thus making it more conducive to ensuring that the drill bit reaches the location of the bridge plug.

[0004] The technical solution provided by this invention is: a long horizontal section drilling tool, including a grinding shoe, a screw drill bit, a stabilizer and a drilling string, wherein the drilling string includes a conventional string and a peristaltic string, and the peristaltic string includes type A peristaltic segments and type B peristaltic segments, which are alternately interspersed in the conventional string;

[0005] Both Type A and Type B peristaltic joints include an outer tube, a central tube, a piston, slips, a slip pusher ring, a telescopic tube, and an end ring. The upper end of the central tube is fixed to the inner side of the outer tube, and there is an annular cavity between the central tube and the outer tube. The telescopic tube is slidably sealed within the annular cavity. The piston, slip pusher ring, and slips are sequentially arranged in the annular cavity above the telescopic tube. The inner side of the piston is slidably sealed with the central tube, while the outer side of the piston has a gap with the outer tube. The outer side of the slip pusher ring is slidably sealed with the outer tube, and the inner side of the slip pusher ring can slidably seal with the piston. The upper part of the slip pusher ring has an axial through hole, and the outer tube has a hole for the slip to expand. The telescopic tube has an opening, with equally spaced slips arranged around the circumference of the central tube. After expansion, the slips are anchored to the sleeve. The end ring is fixed to the lower end of the outer tube, and the lower end of the telescopic tube extends beyond the end ring. A compression spring is installed between the slip push ring and the piston. The spring force of the compression spring causes the piston to tend to move downward. The central tube has a pressure transmission hole, and the hydraulic pressure transmitted through the pressure transmission hole pushes the telescopic tube downward. The outer tube above the end ring has a balance hole, which is used to balance the hydraulic pressure at both ends of the telescopic tube. The inner side of the upper end of the telescopic tube has an expansion cavity. An elastic gathering ring is installed on the outer side of the slip, and the elastic force of the elastic gathering ring is greater than the elastic force of the compression spring.

[0006] For ease of distinction, the components in a Type A peristaltic joint are named as follows: outer tube A, central tube A, piston A, slip A, slip push ring A, telescopic tube A, end ring A, annular cavity A, window A, compression spring A, pressure transmission hole A, balance hole A, expansion cavity A, and elastic gathering ring A; the components in a Type B peristaltic joint are named as follows: outer tube B, central tube B, piston B, slip B, slip push ring B, telescopic tube B, end ring B, annular cavity B, window B, compression spring B, pressure transmission hole B, balance hole B, expansion cavity B, and elastic gathering ring B.

[0007] The inner wall of the outer tube of the type B peristaltic joint has an annular groove, and a limit block is set in the annular groove;

[0008] In the initial state, the B-type peristaltic joint has a sliding seal in the expansion cavity with an unlocking ring. The upper outer side of the unlocking ring abuts against the limiting block to prevent the limiting block from falling out of the annular groove. The upper end of the telescopic tube is limited by the limiting block. A lower shear pin is provided between the unlocking ring and the central tube. A strong magnetic block is provided at the bottom of the expansion cavity. The piston is located above the pressure transmission hole and an upper shear pin is provided between it and the central tube.

[0009] A further technical solution is as follows: Both Type A and Type B peristaltic joints have elastic claws on the lower outer side of the piston. The upper end of the elastic claw is fixedly connected to the piston, and the lower part of the elastic claw has a tendency to spring away from the piston. The lower part of the elastic claw has a claw hook, and the inner wall of the outer tube has an annular hook groove that engages with the claw hook. After the claw hook enters the annular hook groove, it limits the sliding of the elastic claw and the piston. The lower part of the elastic claw has a slope, and the upper end of the telescopic tube has a protrusion for contacting the slope. After the protrusion contacts the slope, it pushes the claw hook of the elastic claw towards the piston, forcing the claw hook to disengage from the annular hook groove. For ease of distinction, the components in Type A peristaltic joints are named: elastic claw A, claw hook A, and annular hook groove A; the components in Type B peristaltic joints are named: elastic claw B, claw hook B, and annular hook groove B.

[0010] A further technical solution is to leave a gap between the inner side of the slip ring and the central tube.

[0011] A drilling process using a long horizontal section drilling tool includes the following steps:

[0012] S1. Preparations before running the well: Ensure that the type B peristaltic joint in the peristaltic tubing is in the extended state, and that the upper and lower shear pins are not cut off at this time.

[0013] S2, Release the release ring: When the frictional resistance of the horizontal section is greater than the gravity of the vertical section, making it difficult for the drilling string to continue to be lowered, drilling fluid is pumped into the drilling string through the power source on the ground. After the drilling fluid reaches the predetermined value, the upper and lower shear pins in the Class B creep joint are completely sheared.

[0014] S3, depressurization: After step 2 is completed, the hydraulic pressure pumped into the drill string by the power source on the ground is removed. The piston B in the type B peristaltic joint slides down under the thrust of the compression spring B and blocks the pressure transmission hole B.

[0015] S4. Type A peristaltic joint extends, Type B peristaltic joint retracts: Drilling fluid is pumped back into the drill string through the power source on the ground. The drilling fluid enters through the pressure transmission hole A of the Type A peristaltic joint. The outer tube A of the Type A peristaltic joint remains stationary, while the telescopic tube A extends downward. At this time, the outer tube B of the Type B peristaltic joint moves downward, while the telescopic tube B remains stationary.

[0016] S5. Pressure Relief: After step 4 is completed, the hydraulic pressure pumped into the drill string by the power source on the ground is removed. The piston A in the type A peristaltic joint slides down under the thrust of the compression spring A and blocks the pressure transmission hole A.

[0017] S6, Type B peristaltic joint extends, Type A peristaltic joint retracts: Drilling fluid is pumped back into the drill string through the ground power source. The drilling fluid enters through the pressure transmission hole B of the Type B peristaltic joint. The outer tube B of the Type B peristaltic joint remains stationary, while the telescopic tube B extends downward. At this time, the outer tube A of the Type A peristaltic joint moves downward, while the telescopic tube A remains stationary.

[0018] S7. Depressurization: After step 6 is completed, the hydraulic pressure pumped into the drill string by the power source on the ground is removed. The piston B in the type B peristaltic joint slides down under the thrust of the compression spring B and blocks the pressure transmission hole B.

[0019] S8. Continue the cycle of steps S4-S7.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. In traditional drilling tool lowering processes, the entire tubing string advances, and the entire horizontal section of the string rubs against the wellbore, resulting in significant frictional resistance. This invention uses an alternating creeping motion between adjacent tubing sections, reducing the frictional resistance to be overcome by half during this alternating motion. This makes it more effective in ensuring the drill string reaches the bridge plug location.

[0022] 2. In this invention, when the tubing string is pulled out, the slips automatically retract into the outer tubing, preventing the well from getting stuck and unable to be pulled up. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 This is a simplified diagram of the peristaltic process of the drilling and grinding string in this invention.

[0025] Figure 3 This is a cross-sectional view of the type A peristaltic segment in this invention.

[0026] Figure 4 This is a cross-sectional view of the type B peristaltic segment in this invention.

[0027] Figure 5 This is a schematic diagram of the elastic claw of the type A peristaltic joint in this invention engaging and releasing with the upper end of the telescopic tube.

[0028] Figure 6 This is a schematic diagram of the elastic claw of the type B peristaltic joint in this invention engaging and releasing with the upper end of the telescopic tube.

[0029] Figure 7 This represents the initial state of the conventional tubing string and the peristaltic tubing string in the horizontal well section of this invention.

[0030] Figure 8 This refers to the state after the upper and lower shearing spikes are cut off following the injection of hydraulic pressure into the drilling and grinding string in this invention.

[0031] Figure 9 yes Figure 8 The state of the two peristaltic joints after the drilling and grinding string is depressurized.

[0032] Figure 10 This diagram illustrates the process of type A peristaltic sacs extending and type B peristaltic sacs contracting.

[0033] Figure 11 This is a diagram showing the final state where type A peristaltic sacs are fully extended and type B peristaltic sacs are fully contracted.

[0034] Figure 12 yes Figure 11 The state of the two peristaltic joints after the drilling and grinding string is depressurized.

[0035] Figure 13 This diagram illustrates the process of type B peristaltic sacs extending and type A peristaltic sacs contracting.

[0036] Figure 14 This is a diagram showing the final state where type B peristaltic sacs are fully extended and type A peristaltic sacs are fully contracted.

[0037] Figure 15 yes Figure 14 The state of the two peristaltic joints after the drilling and grinding string is depressurized.

[0038] In the diagram: 1. Casing; 2. Drilling string; 3. Centralizer; 4. Screw drill bit; 5. Grinding shoe; 6. Bridge plug; 21. Type A peristaltic joint; 22. Type B peristaltic joint; 23. Conventional string; 2101. Outer tube A; 2102. Slip A; 2103. Slip pusher ring A; 2104. Piston A; 2105. Telescopic tube A; 2106. Center tube A; 2107. End ring A; 2108. Balance hole A; 2109. Expanding cavity A; 2110. Pressure transmission hole A; 2111. Elastic claw A; 2112. Compression spring A; 2113. Window A; 2114. Elastic gathering ring A; 2115. Annular cavity A; 2116. Annular hook groove A; 2117 2201. Claw hook A; 2202. Outer tube B; 2203. Slip B; 2204. Slip push ring B; 2205. Piston B; 2206. Telescopic tube B; 2207. Center tube B; 2208. End ring B; 2209. Balance hole B; 22000. Expansion cavity B; 2210. Pressure transmission hole B; 2211. Elastic claw B; 2212. Compression spring B; 2213. Window B; 2214. Elastic gathering ring B; 2215. Annular cavity B; 2216. Annular hook groove B; 2217. Claw hook B; 2218. Limiting block; 2219. Unlocking ring; 2220. Strong magnetic block; 2221. Annular groove; 2222. Upper shear pin; 2223. Lower shear pin. Detailed Implementation

[0039] To make the technical problem to be solved, the technical solution and the beneficial effects of the present invention clearer, the following description is provided in conjunction with the appendix. Figure 1-14 The present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0040] This embodiment is a long horizontal section drilling tool, which structurally includes a grinding shoe 5, a screw drill 4, a stabilizer 3, and a drilling string 2. These are products that already exist in the prior art, and the connection methods between the products are also well known to those skilled in the art, so they will not be described in detail here.

[0041] The innovation of this embodiment lies in the following: the drilling string 2 includes a conventional string 23 and a peristaltic string. The peristaltic string includes type A peristaltic joints 21 and type B peristaltic joints 22. Type A peristaltic joints 21 and type B peristaltic joints 22 are alternately interspersed in the conventional string 23. The length of the conventional string 23 between adjacent type A peristaltic joints 21 and type B peristaltic joints 22 is kept as equal as possible, so that the frictional force overcome by each segment during forward peristalsis is basically consistent. Type A peristaltic joints 21 and type B peristaltic joints 22 are mainly installed in the drilling string 2 in the horizontal well section.

[0042] like Figure 3 and Figure 4 As shown, both Type A peristaltic joint 21 and Type B peristaltic joint 22 include an outer tube, a central tube, a piston, slips, a slip push ring, a telescopic tube, and an end ring. The upper end of the central tube is fixed to the inner side of the outer tube, and an annular cavity is left between the central tube and the outer tube. The telescopic tube is slidably sealed within the annular cavity. The piston, slip push ring, and slips are sequentially arranged in the annular cavity above the telescopic tube. The inner side of the piston is slidably sealed with the central tube, while the outer side of the piston has a gap with the outer tube. The outer side of the slip push ring is slidably sealed with the outer tube, and the inner side of the slip push ring can slidably seal with the outer side of the piston. A compression spring is provided between the slip push ring and the piston. Under the action of elastic force, the piston tends to slide downward relative to the slip push ring. The slip push ring has an axial through hole (as an alternative to the through hole, a gap can be left between the inner side of the slip push ring and the central tube). The upper end face of the slip push ring is a conical surface, and the lower end face of the slip also has a concave conical surface. When the slip push ring moves upward, the slip expands under the thrust. The expanded slip is anchored on the sleeve 1. The slips are evenly spaced along the outer wall of the central tube, and the outer tube has openings for the slips to expand. An elastic gathering ring is provided on the outer side of the slip. The elastic force of the elastic gathering ring is greater than the elastic force of the compression spring. After the upward thrust generated by the hydraulic pressure on the lower end face of the piston disappears, the slip will retract inward under the action of the elastic gathering ring, pushing the slip push ring downward. The end ring is fixed to the lower end of the outer tube, and the lower end of the telescopic tube extends beyond the end ring. The central tube has a pressure transmission hole, and the hydraulic pressure transmitted through the pressure transmission hole pushes the telescopic tube downward. The outer tube above the end ring has a balance hole, which is used to balance the hydraulic pressure at both ends of the telescopic tube. The inner side of the upper end of the telescopic tube has an expansion cavity.

[0043] For ease of distinction, the components in the Type A peristaltic joint 21 are named as follows: outer tube A2101, central tube A2106, piston A2104, slip A2102, slip push ring A2103, telescopic tube A2105, end ring A2107, annular cavity A2115, window A2113, compression spring A2112, pressure transmission hole A2110, balance hole A2108, expansion cavity A2109, and elastic gathering ring A2 114; The components in the Class B peristaltic joint 22 are named as follows: outer tube B2201, central tube B2206, piston B2204, slip B2202, slip push ring B2203, telescopic tube B2205, end ring B2207, annular cavity B2215, window B2213, compression spring B2212, pressure transmission hole B2210, balance hole B2208, expansion cavity B2209, and elastic gathering ring B2214.

[0044] Unlike the type A peristaltic joint 21, the inner wall of the outer tube B2201 of the type B peristaltic joint 22 also has an annular groove 2221, and a limiting block 2218 is provided in the annular groove 2221. In the initial state of the type B peristaltic joint 22: the expansion cavity B2209 is provided with a sliding seal with an unlocking ring 2219. The upper outer side of the unlocking ring 2219 abuts against the limiting block 2218 to prevent the limiting block 2218 from falling out of the annular groove 2221. The upper end of the telescopic tube B2205 is limited by the limiting block 2218. A lower shear pin 2223 is provided between the unlocking ring 2219 and the central tube B2206. A strong magnetic block 2220 is provided at the bottom of the expansion cavity B2209. The piston B2204 is located above the pressure transmission hole B2210 and is provided with an upper shear pin 2222 between it and the central tube B2206. Both the release ring 2219 and the limiting block 2218 are made of magnetic materials, such as carbon steel. When hydraulic pressure is applied to the upper surface of the release ring 2219, pushing it downwards and cutting the lower shear pin 2223, the release ring 2219 is attracted to the strong magnetic block 2220 under the attraction of the strong magnetic block 2220. Then, the limiting block 2218, no longer bound by the release ring 2219, is also attracted to the strong magnetic block 2220. Within the type B peristaltic joint 22, the limiting block 2218, the release ring 2219, the strong magnetic block 2220, and the telescopic tube B2205 are finally magnetically attracted together and move synchronously in subsequent operations.

[0045] The function of the expansion cavity B2209 is to accommodate the release ring 2219 and the limiting block 2218.

[0046] like Figure 5 , 6As shown, both the lower outer side of the piston of the type A peristaltic joint 21 and the type B peristaltic joint 22 are equipped with elastic claws. The elastic claws are evenly arranged along the circumference of the piston. The upper end of the elastic claw is fixedly connected to the piston by a screw. The lower part of the elastic claw has a spring-like tendency to move away from the piston (expanding outward). The lower part of the elastic claw is equipped with a claw hook. The inner wall of the outer tube is equipped with an annular hook groove that cooperates with the claw hook. After the claw hook enters the annular hook groove, it limits the sliding of the elastic claw and the piston. The lower part of the elastic claw is equipped with a slope. The upper end of the telescopic tube is equipped with a protrusion for touching the slope. After the protrusion touches the slope, it pushes the claw hook of the elastic claw toward the direction of approaching the piston, forcing the claw hook to disengage from the annular hook groove.

[0047] For ease of distinction, the components in the type A peristaltic joint 21 are named as: elastic claw A2111, claw hook A2117, and annular hook groove A2116; the components in the type B peristaltic joint 22 are named as: elastic claw B2211, claw hook B2217, and annular hook groove B2216.

[0048] The peristaltic process in this embodiment is as follows:

[0049] 1. For example Figure 7 As shown, after being lowered into the well in this embodiment, the type A peristaltic joint 21 is in a contracted state due to friction, while the telescopic tube B2205 in the type B peristaltic joint 22 remains in an extended state due to the constraint of the limiting block 2218. This state is referred to as the initial state. In the initial state, the pressure transmission hole A2110 of the type A peristaltic joint 21 and the pressure transmission hole B2210 of the type B peristaltic joint 22 are both in the open state.

[0050] 2. For example Figure 8 As shown, drilling fluid is pumped into the drill string 2 via a ground power source (high-pressure screw pump). The drilling fluid pressure can enter the type A peristaltic joint 21 through pressure transmission hole A2110 and the type B peristaltic joint 22 through pressure transmission hole B2210. When the drilling fluid pressure reaches a predetermined value (6 MPa-6.5 MPa in this embodiment):

[0051] The hydraulic thrust entering the Class A peristaltic joint 21 acts on the piston A2104 and the telescopic tube A2105. Since the hydraulic pressure (6 MPa-6.5 MPa in this embodiment) is relatively small, the thrust generated by the hydraulic pressure on the piston A2104 is only enough to overcome the elastic force of the compression spring A2112 to push the piston A2104 upward a short distance, but cannot overcome the elastic force of the elastic gathering ring A2114 to expand the slip A2102. The thrust acting on the telescopic tube A2105 cannot push the telescopic tube A2105 downward because the thrust is insufficient to overcome the friction between the conventional tube 23 and the sleeve 1 below it.

[0052] The hydraulic thrust entering the peristaltic joint 22 acts on the piston B2204 and the release ring 2219, cutting off both the upper shear pin 2222 and the lower shear pin 2223. After the upper shear pin 2222 is cut off, the hydraulic pressure continues to act on the piston B2204. Since this hydraulic pressure (6 MPa-6.5 MPa in this embodiment) is relatively small, the thrust generated by the hydraulic pressure is only enough to overcome the elastic force of the compression spring B2212 to push the piston B2204 upward a short distance, and cannot overcome the elastic force of the elastic gathering ring B2214 to expand the slip B2202. After the lower shear pin 2223 is cut off, the release ring 2219 and the limiting block 2218 are magnetically attracted by the strong magnetic block 2220 and enter the expansion cavity B2209.

[0053] 3. For example Figure 9 As shown, stop pumping drilling fluid into the drill string 2 via the ground power source (high-pressure screw pump).

[0054] After the hydraulic pressure is removed, the piston A2104 in the Class A peristaltic joint 21 moves downward under the action of the compression spring A2112 and abuts against the telescopic tube A2105. At this time, the pressure transmission hole A2110 is still in the open state.

[0055] After the hydraulic pressure is removed, the piston B2204 in the type B peristaltic joint 22 moves downward under the action of the compression spring B2212 until the claw hook B2217 of the elastic claw B2211 enters the annular hook groove B2216, at which point the piston B2204 stops sliding. At this time, the piston B2204 blocks the pressure transmission hole B2210, and the piston B2204 separates from the slip push ring B2203.

[0056] 4. For example Figure 10 As shown, drilling fluid is pumped back into the drill string 2 via a ground power source (high-pressure screw pump). The drilling fluid pressure can only enter the type A peristaltic joint 21 through pressure transmission hole A2110, and cannot enter the type B peristaltic joint 22 through pressure transmission hole B2210. In this embodiment, the drilling fluid pressure is controlled between 18 MPa and 20 MPa. It is important to emphasize that the pressure at this time must be less than the maximum allowable working pressure of the screw drill string 4.

[0057] The hydraulic thrust entering the Class A peristaltic joint 21 acts on the piston A2104 and the telescopic tube A2105. The thrust acting on the piston A2104 can overcome both the elastic force of the compression spring A2112 and the elastic force of the elastic gathering ring A2114 to expand the slip A2102. The thrust acting on the telescopic tube A2105 can push the telescopic tube A2105 downward because the thrust is sufficient to overcome the friction between the conventional tube string 23 and the sleeve 1 below it.

[0058] During this process, the outer tube A2101 of the type A peristaltic joint 21 is fixed in place by the slip A2102, while the telescopic tube A2105 extends downwards; the outer tube B2201 of the type B peristaltic joint 22 (slip B2202, slip push ring B2203, and piston B2204) moves downwards, while the telescopic tube B2205 remains fixed (because the telescopic tube B2205 is restricted by the outer tube A2101 of the adjacent type A peristaltic joint 21 below it). The liquid in the annular cavity B2215 above the telescopic tube B2205 passes sequentially through the outer side of the piston B2204, the space between the piston B2204 and the slip push ring B2203, and the axial through hole of the slip push ring B2203, finally draining into the opening B2213. This will ultimately achieve... Figure 11 The state shown.

[0059] Upon reaching Figure 11 Before the state, there will be Figure 6 The process is as follows: In the type B peristaltic joint 22, the upper end of the telescopic tube B2205 first contacts the lower end of the elastic claw B2211, pushing the claw hook B2217 out of the annular hook groove B2216, releasing the limiting effect of the claw hook B2217 and the annular hook groove B2216, and the piston B2204 is finally pushed by the telescopic tube B2205 to... Figure 11 The state shown.

[0060] 5. For example Figure 12 As shown, the pumping of drilling fluid into the drill string 2 via the ground power source (high-pressure screw pump) was stopped once again.

[0061] After the hydraulic pressure is removed, the piston A2104 in the Class A peristaltic joint 21 moves downward under the action of the compression spring A2112 until the claw hook A2117 of the elastic claw A2111 enters the annular hook groove A2116, at which point the piston A2104 stops sliding. At this time, the piston A2104 blocks the pressure transmission hole A2110, and the piston A2104 separates from the slip push ring A2103.

[0062] After the hydraulic pressure is removed, the piston B2204 in the type B peristaltic joint 22 moves downward under the action of the compression spring B2212 and abuts against the telescopic tube B2205. At this time, the pressure transmission hole B2210 is still in the open state.

[0063] 6. For example Figure 13 As shown, drilling fluid is pumped back into the drill string 2 via a ground power source (high-pressure screw pump). The drilling fluid pressure cannot enter the type A peristaltic joint 21 through pressure transmission hole A2110, but can only enter the type B peristaltic joint 22 through pressure transmission hole B2210. In this embodiment, the drilling fluid pressure is controlled between 18 MPa and 20 MPa. It is important to emphasize that the pressure at this time must be less than the maximum allowable working pressure of the screw drill string 4.

[0064] The hydraulic thrust entering the Class B peristaltic joint 22 acts on the piston B2204 and the telescopic tube B2205. The thrust acting on the piston B2204 can overcome both the elastic force of the compression spring B2212 and the elastic force of the elastic gathering ring B2214 to expand the slip B2202. The thrust acting on the telescopic tube B2205 can push the telescopic tube B2205 downward because the thrust is sufficient to overcome the friction between the conventional tube string 23 and the sleeve 1 below it.

[0065] During this process, the outer tube B2201 of the type B peristaltic joint 22 is fixed in place by the slip B2202, while the telescopic tube B2205 extends downwards; the outer tube A2101 of the type A peristaltic joint 21 (slip A2102, slip push ring A2103, and piston A2104) moves downwards, while the telescopic tube A2105 remains fixed (because the telescopic tube A2105 is restricted by the outer tube B2201 of the adjacent type B peristaltic joint 22 below it). The liquid in the annular cavity A2115 above the telescopic tube A2105 passes sequentially through the outer side of piston A2104, the space between piston A2104 and slip push ring A2103, and the axial through hole of slip push ring A2103, finally draining into the opening A2113. This will ultimately achieve... Figure 14 The state shown.

[0066] Upon reaching Figure 14 Before the state, such as Figure 5 As shown, in the type A peristaltic joint 21, the upper end of the telescopic tube A2105 first contacts the lower end of the elastic claw A2111, pushing the claw hook A2117 out of the annular hook groove A2116, releasing the limiting effect of the claw hook A2117 and the annular hook groove A2116, and the piston A2104 is finally pushed by the telescopic tube to Figure 14 The state shown.

[0067] 7. For example Figure 15 As shown, the pumping of drilling fluid into the drill string 2 via the ground power source (high-pressure screw pump) was stopped once again.

[0068] After the hydraulic pressure is removed, the piston A2104 in the Class A peristaltic joint 21 moves downward under the action of the compression spring A2112 until it abuts against the telescopic tube A2105. At this time, the pressure transmission hole A2110 is still in the open state.

[0069] After the hydraulic pressure is removed, the piston B2204 in the type B peristaltic joint 22 moves downward under the action of the compression spring B2212 until the claw hook B2217 of the elastic claw B2211 enters the annular hook groove B2216, at which point the piston B2204 stops sliding. At this time, the piston B2204 blocks the pressure transmission hole B2210, and the piston B2204 separates from the slip push ring B2203.

[0070] The function of Kava: for example in Figure 10In the process, the hydraulic thrust entering the type A peristaltic joint 21 acts on the piston A2104 and the telescopic tube A2105. The thrust acting on the piston A2104 ultimately acts on the outer tube A2101, generating a thrust that pushes the outer tube A2101 upward. In order to prevent the outer tube A2101 from moving upward, a slip A2102 is provided. After the slip A2102 expands, it is anchored on the sleeve 1, thereby preventing the outer tube A2101 from moving upward. Consequently, the peristaltic direction of both types of peristaltic joints can only be downward.

[0071] The function of the slip and piston: During the contraction and extension of the peristaltic kink, the piston enters the slip and piston ring under hydraulic thrust, forming a sealed fit. The hydraulic thrust simultaneously pushes both, expanding the slip. During the extension and contraction of the peristaltic kink, the pressure transmission hole is closed, and the piston is not under hydraulic thrust. At this time, the piston is separated from the slip and piston ring by the thrust of the compression spring. The liquid above the telescopic tube can then pass sequentially through the outer side of the piston, the axial through-hole of the slip and piston ring, reach the opening, and be discharged into the outer tube, ensuring no pressure buildup between the outer tube and the telescopic tube.

[0072] In this embodiment, when the drill string 2 is pulled out, under the action of friction and gravity, both the type A peristaltic joint 21 and the type B peristaltic joint 22 are in the extended state. At this time, under the elastic force of the compression spring, the pistons in the type A peristaltic joint 21 and the type B peristaltic joint 22 slide downward until the claw hook enters the annular hook groove. At this time, the piston is in the position of blocking the pressure transmission hole. At this time, the slips are in the retracted state under the action of the elastic gathering ring, ensuring that no slip jamming or well jamming accident will occur.

[0073] A drilling process using a long horizontal section drilling tool includes the following steps:

[0074] S1. Preparations before running the well: Ensure that the B-type peristaltic joint 22 in the peristaltic tubing is in the extended state, at which time both the upper shear pin 2222 and the lower shear pin 2223 are in the uncut state.

[0075] S2, Release of the release ring 2219: When the frictional resistance of the horizontal section is greater than the gravity of the vertical section, making it difficult for the drilling string 2 to continue to be lowered, drilling fluid is pumped into the drilling string 2 through the power source on the ground. After the drilling fluid reaches the predetermined value, the upper shear pin 2222 and the lower shear pin 2223 in the B-type peristaltic joint 22 are all sheared off.

[0076] S3, depressurization: After step 2 is completed, the hydraulic pressure pumped into the drill string 2 by the power source on the ground is removed. The piston B2204 in the B-type peristaltic joint 22 slides down under the thrust of the compression spring B2212 and blocks the pressure transmission hole B2210.

[0077] S4, Type A peristaltic joint 21 extends, Type B peristaltic joint 22 retracts: Drilling fluid is pumped back into the drill string 2 through the power source on the ground. The drilling fluid enters through the pressure transmission hole A2110 of Type A peristaltic joint 21. The outer tube A2101 of Type A peristaltic joint 21 remains stationary, and the telescopic tube A2105 extends downward. At this time, the outer tube B2201 of Type B peristaltic joint 22 moves downward, and the telescopic tube B2205 remains stationary.

[0078] S5. Pressure release: After step 4 is completed, the hydraulic pressure pumped into the drill string 2 by the power source on the ground is removed. The piston A2104 in the type A peristaltic joint 21 slides down under the thrust of the compression spring A2112 and blocks the pressure transmission hole A2110.

[0079] S6, Type B peristaltic joint 22 extends, Type A peristaltic joint 21 retracts: Drilling fluid is pumped back into the drilling string 2 through the ground power source. The drilling fluid enters through the pressure transmission hole B2210 of Type B peristaltic joint 22. The outer tube B2201 of Type B peristaltic joint 22 remains stationary, and the telescopic tube B2205 extends downward. At this time, the outer tube A2101 of Type A peristaltic joint 21 moves downward, and the telescopic tube A2105 remains stationary.

[0080] S7. Pressure Relief: After step 6, the hydraulic pressure pumped into the drill string 2 by the power source on the ground is removed. The piston B2204 in the B-type peristaltic joint 22 slides down under the thrust of the compression spring B2212 and blocks the pressure transmission hole B2210.

[0081] S8. Continue the cycle of steps S4-S7.

[0082] In summary, the alternating creeping movement of adjacent pipe sections in this invention reduces the frictional resistance that needs to be overcome during the alternating movement to half of the original, thus making it more conducive to ensuring that the drill bit reaches the location of the bridge plug 6.

Claims

1. A long horizontal section drilling tool, comprising a grinding shoe (5), a screw drill bit (4), a stabilizer (3), and a drilling string (2), characterized in that: The drilling string (2) includes a conventional string (23) and a peristaltic string. The peristaltic string includes a type A peristaltic segment (21) and a type B peristaltic segment (22). The type A peristaltic segment (21) and the type B peristaltic segment (22) are alternately interspersed in the conventional string (23). Both type A peristaltic joints (21) and type B peristaltic joints (22) include an outer tube, a central tube, a piston, slips, a slip pusher ring, a telescopic tube, and an end ring. The upper end of the central tube is fixed to the inner side of the outer tube, and there is an annular cavity between the central tube and the outer tube. The telescopic tube is slidably sealed within the annular cavity. The piston, slip pusher ring, and slips are sequentially arranged in the annular cavity above the telescopic tube. The inner side of the piston is slidably sealed with the central tube, the outer side of the slip pusher ring is slidably sealed with the outer tube, and the outer side of the piston... The inner side of the slip push ring is slidably sealed to the slip push ring. The slip push ring has an axial through hole. The outer tube has an opening for the slip expansion. The end ring is fixed to the lower end of the outer tube. The lower end of the telescopic tube extends beyond the end ring. A compression spring is provided between the slip push ring and the piston. The central tube has a pressure transmission hole. The outer tube above the end ring has a balance hole. The inner side of the upper end of the telescopic tube has an expansion cavity. An elastic gathering ring is provided on the outer side of the slip. The elastic force of the elastic gathering ring is greater than the elastic force of the compression spring. For ease of distinction, the components in the Class A peristaltic joint (21) are named as follows: outer tube A (2101), central tube A (2106), piston A (2104), slip A (2102), slip push ring A (2103), telescopic tube A (2105), end ring A (2107), annular cavity A (2115), window A (2113), compression spring A (2112), pressure transmission hole A (2110), balance hole A (2108), expansion cavity A (2109), and elastic gathering ring A (2100). 14); The components in the Class B peristaltic joint (22) are named as follows: outer tube B (2201), central tube B (2206), piston B (2204), slip B (2202), slip push ring B (2203), telescopic tube B (2205), end ring B (2207), annular cavity B (2215), window B (2213), compression spring B (2212), pressure transmission hole B (2210), balance hole B (2208), expansion cavity B (2209), and elastic gathering ring B (2214); The inner wall of the outer tube B (2201) has an annular groove (2221), and a limit block (2218) is provided in the annular groove (2221). In the initial state, the B-type peristaltic joint (22) has a sliding seal with a release ring (2219) in the expansion cavity B (2209). The upper part of the release ring (2219) abuts against the limiting block (2218) to prevent the limiting block (2218) from falling out of the annular groove (2221). The upper end of the telescopic tube B (2205) is limited by the limiting block (2218). An upper shear pin (2222) is provided between the release ring (2219) and the central tube B (2206). A strong magnetic block (2220) is provided at the bottom of the expansion cavity B (2209). The piston B (2204) is located above the pressure transmission hole B (2210) and a lower shear pin (2223) is provided between it and the central tube B (2206).

2. The long horizontal section drilling tool according to claim 1, characterized in that: Both the lower outer side of the piston of the type A peristaltic joint (21) and the type B peristaltic joint (22) are equipped with elastic claws. The upper end of the elastic claw is fixedly connected to the piston. The lower part of the elastic claw has a tendency to bounce away from the piston. The lower part of the elastic claw is equipped with a claw hook. The inner wall of the outer tube is equipped with an annular hook groove that cooperates with the claw hook. After the claw hook enters the annular hook groove, it limits the sliding of the elastic claw and the piston. The lower part of the elastic claw is equipped with a slope. The upper end of the telescopic tube is equipped with a protrusion for touching the slope. After the protrusion touches the slope, it pushes the claw hook of the elastic claw toward the direction of approaching the piston, forcing the claw hook to disengage from the annular hook groove. For ease of distinction, the components in the type A peristaltic segment (21) are named as: elastic claw A (2111), claw hook A (2117) and annular hook groove A (2116); the components in the type B peristaltic segment (22) are named as: elastic claw B (2211), claw hook B (2217) and annular hook groove B (2216).

3. The long horizontal section drilling tool according to claim 1, characterized in that: There is a gap between the inner side of the slip ring and the central tube.

4. A drilling process using the long horizontal section drilling tool as described in claim 1, characterized in that, Includes the following steps: S1. Preparations before running into the well: Ensure that the B-type peristaltic joint (22) in the peristaltic tubing is in the extended state, at which time both the upper shear pin (2222) and the lower shear pin (2223) are in the uncut state; S2, Release the release ring (2219): When the frictional resistance of the horizontal section is greater than the gravity of the vertical section, making it difficult for the drill string (2) to continue to be lowered, drilling fluid is pumped into the drill string (2) through the power source on the ground. After the drilling fluid reaches the predetermined value, the upper shear pin (2222) and lower shear pin (2223) in the B-type peristaltic joint (22) are completely sheared. S3, pressure release: After step 2 is completed, the hydraulic pressure pumped into the drill string (2) by the power source on the ground is removed. The piston B (2204) in the B-type peristaltic joint (22) slides down under the thrust of the compression spring B (2212) and blocks the pressure transmission hole B (2210). S4, Type A peristaltic joint (21) extends, Type B peristaltic joint (22) retracts: Drilling fluid is pumped back into the drill string (2) through the power source on the ground. The drilling fluid enters through the pressure transmission hole A (2110) of Type A peristaltic joint (21). The outer tube A (2101) of Type A peristaltic joint (21) remains stationary, and the telescopic tube A (2105) extends downward. At this time, the outer tube B (2201) of Type B peristaltic joint (22) moves downward, and the telescopic tube B (2205) remains stationary. S5, depressurization: After step 4, the hydraulic pressure pumped into the drill string (2) by the power source on the ground is removed. The piston A (2104) in the type A peristaltic joint (21) slides down under the thrust of the compression spring A (2112) and blocks the pressure transmission hole A (2110). S6, B-type peristaltic joint (22) extends, A-type peristaltic joint (21) retracts: Drilling fluid is pumped back into the drilling string (2) through the ground power source. The drilling fluid enters through the pressure transmission hole B (2210) of the B-type peristaltic joint (22). The outer tube B (2201) of the B-type peristaltic joint (22) remains stationary, and the telescopic tube B (2205) extends downward. At this time, the outer tube A (2101) of the A-type peristaltic joint (21) moves downward, and the telescopic tube A (2105) remains stationary. S7, Depressurization: After step 6, the hydraulic pressure pumped into the drill string (2) by the power source on the ground is removed. The piston B (2204) in the B-type peristaltic joint (22) slides down under the thrust of the compression spring B (2212) and blocks the pressure transmission hole B (2210). S8. Continue the cycle of steps S4-S7.

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