A press-in type rope coring device

Abstract

The present invention relates to a press-in type rope coring device, which comprises: a joint assembly, which can be sealed and abutted with a seat ring of an external drilling tool assembly; a driving assembly, which has a hydraulic chamber connected to a liquid channel formed therein, and the driving assembly comprises an external assembly and an internal assembly, and the internal assembly comprises: a connecting rod arranged in an axial direction; a piston-type motion assembly sealed and slidably arranged between the connecting rod and the external assembly, the piston-type motion assembly seals and separates the hydraulic chamber into an upper chamber and a lower chamber, and one end of the connecting rod is fixed on the joint assembly; a connecting transition part sealed and slidably sleeved on the connecting rod, the connecting transition part is sealed and fixedly connected to the piston-type motion assembly, the connecting transition part and the connecting rod seal extend to the outside of the external assembly, and a medium channel connected to the lower chamber is formed on the external assembly; and a coring assembly, which is fixedly connected to the connecting transition part. The present invention can effectively improve the acquisition quality and recovery rate of cores.

Description

Technical Field

[0001] The invention belongs to the technical field of core acquisition, and in particular relates to a press-in type rope coring device. Background Art

[0002] Coring drilling refers to the technology of drilling holes in the formation and obtaining cores through drilling equipment and drilling tools. The commonly used coring drilling method is rotary drilling, that is, the top drive of the drilling rig drives the drill tool to rotate, and the drill bit grinds and scratches the bottom formation of the hole. During the drilling process, the drill bit temperature is reduced by the circulation of drilling fluid and the cuttings are carried out of the borehole. At the same time, the core column gradually enters the core tube until the drilling round is completed.

[0003] Since the drilling method currently used is designed for rock formations, it is not suitable for drilling and coring operations in soft formations such as silt and silt sand with high water content in the shallow surface of the ocean and rivers and lakes. When coring in these soft formations, the disturbance caused by the rotation of the drill bit will cause the formation structure in the core to change, and it is easy to be washed by the circulating drilling fluid, resulting in large disturbances in the obtained cores, low coring quality, and substandard core collection rate when approaching the end point. Especially in geological exploration in shallow areas of the ocean, there are often many missing formations due to the substandard core collection rate, and the coring task cannot be completed. In summary, the rotary drilling coring method with mud circulation causes serious damage to the core of soft formations, and it is difficult to apply it to the shallow surface coring drilling process in the ocean and rivers and lakes. Summary of the invention

[0004] In order to solve all or part of the above problems, the present invention aims to provide a press-in type rope coring device, so as to effectively improve the acquisition quality and recovery rate of cores.

[0005] The present application provides a press-in type rope coring device, comprising: a joint assembly which is sealed and connected in sequence, wherein a water inlet hole is formed on the joint assembly, a liquid channel is formed inside the joint assembly, and the joint assembly is configured to be able to seal and abut against a seat ring of an external drilling tool assembly; a driving assembly, wherein a hydraulic chamber connected to the liquid channel is formed inside the driving assembly, and the driving assembly comprises an external assembly and an internal assembly, wherein the internal assembly comprises: a connecting rod arranged in the axial direction; a piston-type motion assembly which is sealed and slidably arranged between the connecting rod and the external assembly, the piston-type motion assembly seals and separates the hydraulic chamber into an upper chamber and a lower chamber, and one end of the connecting rod is fixed to the joint assembly; a connecting transition portion which is sealed and slidably sleeved on the connecting rod, the connecting transition portion is sealed and fixedly connected to the piston-type motion assembly and is located in the lower chamber, the connecting transition portion and the connecting rod seal extend to the outside of the external assembly, a medium channel connected to the lower chamber is formed on the external assembly, and the medium channel is configured to be switchable; and a coring assembly which is fixedly connected to the connecting transition portion, and the coring assembly is configured to be able to move in the axial direction under the drive of the piston-type motion assembly.

[0006] In some embodiments, the external assembly includes a tie rod locking joint, a starting joint, a sealing outer tube and a lower sealing joint that are sealed and fixedly connected in sequence. The tie rod locking joint is fixedly connected to the joint assembly, and the hydraulic chamber is connected to the liquid channel through the gap between the tie rod locking joint and the connecting rod; the connecting transition portion and the connecting rod extend to the outside through the lower sealing joint, and the medium channel is formed on the lower sealing joint; a pressure relief hole is formed at a preset position on the sealing outer tube.

[0007] In some embodiments, the external assembly further includes a protective tube fixedly connected to the lower sealing joint, the coring assembly is disposed inside the protective tube, and a plurality of drainage holes are formed on the protective tube.

[0008] In some embodiments, the external assembly further comprises a fixed piston, which is fixedly connected to the end of the connecting rod, and the fixed piston is sealably disposed inside the coring assembly.

[0009] In some embodiments, the coring assembly includes: a coring pipe joint fixedly connected to the connecting transition portion, a coring pipe joint sealing sleeve being arranged on the connecting pull rod; and a coring tube detachably connected to the coring pipe joint, one end of the coring tube being sleeved on the coring pipe joint, and a fixed piston sealing and slidably arranged inside the coring tube.

[0010] In some embodiments, the core pipe joint has a plurality of radial hanging threaded holes evenly distributed along the circumference, and a hanging hole matching the hanging threaded hole is formed on the core pipe, and the hanging hole is detachably connected to the core pipe joint through a core pipe hanging nail.

[0011] In some embodiments, the piston motion assembly includes: an annular piston, which is sealed and slidably mounted on the connecting rod, and the connecting transition portion is fixedly connected to the annular piston; a starting sleeve, which is mounted on the connecting rod, and at the same time, the starting sleeve is located in the upper chamber, one end of the starting sleeve is sealed and slidably connected to the rod locking joint, and the other end of the starting sleeve is sealed and slidably connected to the starting joint, a gap is formed between the starting sleeve and the connecting rod, and an annular clamping space is formed between the starting sleeve and the starting joint; and a core barrel locking joint, one end of which is sealed and fixedly connected to the annular piston, and the other end is clamped in the annular clamping space by a clamping claw.

[0012] In some embodiments, a plurality of radial positioning threaded holes are evenly distributed along the circumference on the starting joint, the positioning threaded holes are used for threaded connection of the positioning sleeve, a plurality of disc springs and positioning balls are installed in the positioning sleeve, an annular groove is formed on the outer peripheral wall of the starting sleeve, and the positioning ball is elastically abutted against the annular groove so as to be detachable.

[0013] In some embodiments, the joint assembly includes a water inlet joint, a double female joint and a matching extension tube which are sealed and fixedly connected in sequence. A plurality of water inlet holes are formed on the water inlet joint, and the water inlet holes can be selectively threadedly connected to a ground test joint and / or a water inlet plug. An annular tool lift shoulder is formed on the outer peripheral wall of the water inlet joint, and the annular tool lift shoulder is used for sealingly abutting against the seat ring of the drill bit combination; the pull rod locking joint is sealed and fixedly connected to the matching extension tube, and a liquid channel connected to the hydraulic chamber is formed on one end of the matching extension tube connected to the pull rod locking joint, and the connecting rod is fixedly connected to the end of the matching extension tube.

[0014] In some embodiments, a salvage mechanism is further included, wherein a salvage spearhead is provided at one end of the salvage mechanism and a connecting rod is provided at the other end, and the connecting rod is used to be fixedly connected to the joint assembly.

[0015] The press-in rope coring device of the present invention has the following advantages: 1) The press-in rope coring device of the present invention adopts a piston sampling method, and the operation process is safe and reliable. Compared with the prior art, it is simple to operate, saves time and effort, and can effectively achieve high-quality coring and high-yield cores in soft strata on the deep water surface; 2) The press-in rope coring device of the present invention can adjust the pressure by adjusting the number of positioning sleeves and the number of disc springs; 3) After the press-in rope coring device of the present invention completes sampling, it can pressurize the lower cavity to push the annular piston upward, and the core will be pushed out of the coring tube to complete the coring operation. The mechanism recovery operation is simple, convenient to operate, and saves time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic cross-sectional view of a press-in type rope coring device according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A schematic cross-sectional view of the push-in rope coring device along the AA direction is shown;

[0018] Figure 3 is a schematic cross-sectional structural diagram of a connector assembly according to an embodiment of the present invention;

[0019] Figure 4 is a schematic cross-sectional structural diagram of a driving assembly according to an embodiment of the present invention;

[0020] Figure 5 It is a schematic cross-sectional structural diagram of a coring assembly according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to better understand the purpose, structure and function of the present invention, a press-in type rope coring device of the present invention is further described in detail below with reference to the accompanying drawings.

[0022] Figure 1FIG. 1 is a schematic structural diagram of a press-in type rope coring device 100 according to an embodiment of the present invention. Figure 1 As shown, the press-in type rope coring device 100 comprises: a joint assembly 10 which is sealed and connected in sequence, wherein a water inlet hole 101 is formed on the joint assembly 10, a liquid channel 102 is formed inside the joint assembly 10, and the joint assembly 10 is configured to be able to seal and abut with a seat ring of an external drilling tool assembly; a drive assembly 20, wherein a hydraulic chamber 201 which is connected to the liquid channel 102 is formed inside the drive assembly 20, and the drive assembly 20 comprises an external assembly 21 and an internal assembly 22, wherein the internal assembly 22 comprises: a connecting rod 221 which is arranged axially; a piston-type motion assembly 222 which is sealed and slidably arranged between the connecting rod 221 and the external assembly 21, and the piston-type motion assembly 222 moves the hydraulic chamber 201 The seal separates the upper chamber 201a and the lower chamber 201b, and one end of the connecting rod 221 is fixed on the joint assembly 10; a connecting transition part 223 is sealed and slidably sleeved on the connecting rod 221, the connecting transition part 223 is sealed and fixedly connected to the piston-type motion component 222 and is located in the lower chamber 201b, the connecting transition part 223 and the connecting rod 221 are sealed and extend to the outside of the external assembly 21, and a medium channel 224 connected to the lower chamber 201b is formed on the external assembly 21, and the medium channel 224 is configured to be openable and disengageable; and a coring assembly 30, which is fixedly connected to the connecting transition part 223, and the coring assembly 30 is configured to be able to move axially under the drive of the piston-type motion component 222.

[0023] When the push-in rope coring device 100 of the embodiment of the present invention is used, after the push-in rope coring device 100 is lowered into place in the drill string from the wellhead, the joint assembly 10 sits on the seat ring of the bottom drilling tool assembly, and at the same time, the joint assembly 10 cooperates with the seat ring of the drilling tool assembly to achieve a sealed abutment. After the sealed abutment, the drilling fluid cannot move downward, and can only enter the push-in rope coring device 100 through the water inlet hole 101, that is, enter the upper chamber 201a of the hydraulic chamber 201 through the water inlet hole 101 and the liquid channel 102 in sequence. The pressure in the upper chamber 201a increases, pushing the piston-type motion assembly 222 downward relative to the connecting rod 221, so as to drive the connecting transition part 223 downward. The coring assembly 30 fixed at the end of the connecting transition part 223 can move downward under the push of the connecting transition part 223, so as to finally be pressed into the formation for sampling. After sampling is completed, the upper chamber 201a is depressurized by any pressure relief method, such as by setting a pressure relief hole 2131 or by the water inlet hole 101. At the same time, hydraulic medium is input into the lower chamber 201b through the medium channel 224 to increase the pressure in the lower chamber 201b. Under the action of the pressure difference, the piston motion component 222 is pushed upward relative to the connecting rod 221. During the upward movement, the coring component 30 can move upward under the drive of the piston motion component 222 to complete the sampling. After sampling is completed, the press-in rope coring device 100 is salvaged as a whole. The salvaged core is taken out by the coring component 30, and the coring operation is finally completed.

[0024] The push-in rope coring device 100 of the embodiment of the present invention adopts a piston sampling method, and the operation process is safe and reliable. Compared with the prior art, it is simple to operate, saves time and effort, and can effectively achieve high-quality coring and high-recovery rate cores in soft strata on the deep water surface.

[0025] Please refer to Figure 1 and Figure 4 In some embodiments, the external assembly 21 may include a tie rod locking joint 211, a starting joint 212, a sealing outer tube 213 and a lower sealing joint 214 which are sealed and fixedly connected in sequence. The tie rod locking joint 211 is fixedly connected to the joint assembly 10, and the hydraulic chamber 201 is connected to the liquid channel 102 through the gap between the tie rod locking joint 211 and the connecting rod 221; the connecting transition portion 223 and the connecting rod 221 extend to the outside through the lower sealing joint 214, and the medium channel 224 is formed on the lower sealing joint 214; a pressure relief hole 2131 is formed at a preset position on the sealing outer tube 213.

[0026] When the press-in rope coring device 100 of the embodiment of the present invention is used, a pressure relief hole 2131 is formed at a preset position on the sealing outer tube 213. When the piston-type motion component 222 is pushed downward relative to the connecting rod 221, the position of the set pressure relief hole 2131 can be used to determine that the coring component 30 has been completely pressed into the formation for sampling, that is, the pressure relief hole 2131 completes the pressure relief in time so that the piston-type motion component 222 does not continue to descend.

[0027] Please refer to Figure 1 and Figure 5 In some embodiments, the external assembly 21 may further include a protective tube 215 fixedly connected to the lower sealing joint 214, and the coring assembly 30 is disposed inside the protective tube 215. The protective tube 215 is formed with a plurality of drainage holes 2151. With this arrangement, the protective tube 215 can effectively prevent the coring assembly 30 from bending due to collision during the lowering process of the press-in rope coring device 100.

[0028] Please refer to Figure 1 and Figure 5 In some embodiments, the external assembly 21 may further include a fixed piston 216 , which is fixedly connected to the end of the connecting rod 221 , and a seal is disposed inside the coring assembly 30 .

[0029] In the initial state of the push-in rope coring device 100 of the embodiment of the present invention, the fixed piston 216 in the present application can be set so that the bottom surface is basically flush with the bottom surface of the coring assembly 30. During the core formation process, the fixed piston 216 is always in contact with the core to ensure that there is no liquid at the upper end of the core. In this way, when the core may fall due to gravity during the process of lifting the push-in rope coring device 100, a suction negative pressure will be formed between the fixed piston 216 and the core to effectively prevent the core from falling, thereby increasing the core recovery rate. After the sampling is completed, the pressure relief hole 2131 can be sealed with a wire plug, and then the pressure is pressed into the lower chamber 201b through the medium channel 224 to push the piston-type motion assembly 222 upward. Since the fixed piston 216 is fixed, the core will be pushed out of the coring assembly 30 to complete the core extraction operation.

[0030] Please refer to Figure 1 and Figure 5 In some embodiments, the coring assembly 30 may include: a coring pipe joint 31 fixedly connected to the connecting transition portion 223, the coring pipe joint 31 being sealingly sleeved on the connecting pull rod 221; and a coring tube 32 detachably connected to the coring pipe joint 31, one end of the coring tube 32 being sleeved on the coring pipe joint 31, and a fixed piston 216 being sealingly and slidably disposed inside the coring tube 32.

[0031] Please refer to Figure 5In some embodiments, the core pipe joint 31 has a plurality of radial hanging threaded holes 311 evenly distributed along the circumference, and the core pipe 32 is formed with hanging holes 321 matching the hanging threaded holes 311, and the hanging holes 321 are detachably connected to the core pipe joint 31 through the core pipe hanging nails.

[0032] Through the above arrangement, the coring pipe 32 is hung on the coring pipe joint 31 through the coring pipe hanging nail. When all the threads of the coring pipe hanging nail are screwed to the bottom, the coring pipe 32 can be separated from the coring pipe joint 31, and the coring pipe 32 and the core in the middle are transferred away, which is convenient for the installation and disassembly of the coring pipe 32. In this application, in order to reduce the resistance to entering the formation, the coring pipe 32 adopts a thin-walled pipe. The thin-walled pipe can effectively prevent the bending problem caused by collision during the lowering process of the press-in rope coring device 100 under the protection of the protective tube 215.

[0033] In the present application, in order to test the extension effect of the coring tube 32 of the push-in rope coring device 100 on the ground and test the adjustment of the starting pressure, the water inlet on the joint assembly 10 can be sealed with a wire plug on the ground, leaving only one water inlet connected to the ground test joint 14, connected to a pressure pump, and an injection pressure test is performed.

[0034] Please refer to Figure 1 and Figure 4 In some embodiments, the piston motion assembly 222 may include: an annular piston 41, which is sealed and slidably sleeved on the connecting rod 221, and the connecting transition portion 223 is fixedly connected to the annular piston 41; a starting sleeve 42, which is sleeved on the connecting rod 221, and at the same time, the starting sleeve 42 is located in the upper chamber 201a, one end of the starting sleeve 42 is sealed and slidably connected to the rod locking joint 211, and the other end of the starting sleeve 42 is sealed and slidably connected to the starting joint 212, a gap is formed between the starting sleeve 42 and the connecting rod 221, and an annular clamping space 421 is formed between the starting sleeve 42 and the starting joint 212; and a core barrel locking joint 43, one end of which is sealed and fixedly connected to the annular piston 41, and the other end is clamped in the annular clamping space 421 through a clamping claw.

[0035] The connection transition part 223 mentioned in the present application can be constructed as a push-pull cylinder. When the press-in rope coring device 100 of the embodiment of the present invention is in the initial state, the core tube locking joint 43 is clamped in the annular clamping space 421 by the clamping claws, so as to position the annular piston 41 without pressure at the same time. When the pressure of the upper chamber 201a increases, the pressure difference between the upper and lower end surfaces of the starter sleeve 42 causes the starter sleeve 42 to move upward. When the starter sleeve 42 moves upward to the top dead center, that is, the top surface of the starter sleeve 42 contacts the inner step of the pull rod locking joint 211, and because the pressure always exists, the starter sleeve 42 is always at the top dead center during the operation of the press-in rope coring device 100, and at the same time, the annular clamping space 421 is released. When the starting sleeve 42 moves up to the top dead center, the annular piston pulls the core tube locking joint 43 downward under the downward thrust generated by the hydraulic pressure. The claws on the core tube locking joint 43 can shrink inwardly due to no internal obstruction, and escape from the annular clamping space 421 formed by the starting joint 212 and the starting sleeve 42, so that the core tube locking joint 43, the annular piston, the push-pull cylinder, the core tube joint 31 and the core tube 32 can move downward and be pressed into the formation for sampling.

[0036] The claws on the core barrel locking joint 43 mentioned in the present application can be constructed so that the free ends can be retracted inwards under the action of pressure and reset after the pressure is released.

[0037] Please refer to Figure 1 , Figure 2 and Figure 4 In some embodiments, a plurality of radial positioning threaded holes 2121 may be evenly distributed along the circumferential direction on the starting joint 212, and the positioning threaded holes 2121 are used for threaded connection with the positioning sleeve 2122. A plurality of disc springs 2123 and positioning balls 2124 are installed in the positioning sleeve 2122. An annular groove 421 is formed on the outer peripheral wall of the starting sleeve 42, and the positioning ball 2124 is elastically abutted against the annular groove 421 so as to be detachable.

[0038] When the press-in rope coring device 100 of the embodiment of the present invention is in the initial state, the core tube locking joint 43 is clamped in the annular clamping space 421 by the clamping claws. When the upward thrust of the upper chamber 201a is greater than the elastic force generated by the disc spring 2123 in the positioning sleeve 2122, the positioning ball 2124 will escape from the annular groove 421 of the starting sleeve 42, and move upward to the top dead point, that is, the top surface of the starting sleeve 42 contacts the inner step of the pull rod locking joint 211. The starting pressure is also the pressure of the tool in place alarm, and the pressure can be adjusted by adjusting the number of positioning sleeves 2122 and the number of disc springs 2123.

[0039] Please refer to Figure 1 and Figure 3In some embodiments, the joint assembly 10 may include a water inlet joint 11, a double female joint 12 and a matching extension tube 13 which are sealed and fixedly connected in sequence. A plurality of water inlet holes 101 are formed on the water inlet joint 11. The water inlet holes 101 can be selectively threadedly connected to a ground test joint 14 and / or a water inlet plug. An annular tool lifting shoulder 15 is formed on the outer peripheral wall of the water inlet joint 11. The annular tool lifting shoulder 15 is used to seal and abut with the seat ring of the drill bit combination; a pull rod locking joint 211 is sealed and fixedly connected to the matching extension tube 13, and a liquid channel 102 connected to the hydraulic chamber 201 is formed on one end of the matching extension tube 13 connected to the pull rod locking joint 211, and a connecting rod 221 is fixedly connected to the end of the matching extension tube 13.

[0040] Please refer to Figure 1 In some embodiments, a salvaging mechanism 50 is further included. A salvaging spearhead 51 is provided at one end of the salvaging mechanism 50 and a connecting rod 52 is provided at the other end. The connecting rod 52 is used to be fixedly connected to the joint assembly 10.

[0041] It should be noted that the salvage mechanism 50 in the present application can be used with the salvage mechanism 50 in the prior art. It only needs to be connected to the joint assembly 10. The sealed connection and sealed fixation mentioned in the present application can be understood as using a sealing ring to seal while connecting and fixing. The relatively sliding parts mentioned in the present application can be provided with a wear-resistant ring to improve wear resistance.

[0042] In summary, combined with Figure 1 As shown, the push-in type rope coring device 100 of the embodiment of the present invention is generally used as follows:

[0043] After being lowered into position in the drill string from the wellhead, that is, when the tool lifting shoulder 15 of the water inlet joint 11 sits on the seat ring of the bottom hole assembly, the drilling fluid cannot flow downward because the outer sealing ring at the bottom of the tool lifting shoulder 15 cooperates with the seat ring, and can only enter the interior of the sampling tool through the water inlet evenly distributed on the water inlet joint 11. Through the water through hole on the upper joint of the pull rod, it enters the hydraulic chamber 201 formed by the piston inner seal of the annular piston 41.

[0044] Due to the increase of pump pressure in the push-in rope coring device 100, the pressure difference between the upper and lower end surfaces of the start sleeve 42 causes the start sleeve 42 to move upward. When the upward thrust is greater than the elastic force generated by the disc spring 2123 in the positioning sleeve 2122, the positioning ball 2124 will be released from the annular groove 421 of the start sleeve 42 and move upward to the top dead center, that is, the top surface of the start sleeve 42 contacts the inner step of the pull rod locking joint 211, and because the pump pressure always exists, the start sleeve 42 is always at the top dead center during the operation of the push-in rope coring device 100. This starting pressure is also the pressure for the push-in rope coring device 100 to alarm when it is in place, and the pressure can be adjusted by adjusting the number of positioning sleeves 2122 and the number of disc springs 2123.

[0045] When the starting sleeve 42 moves up to the top dead center, the annular piston 41 pulls the core tube locking joint 43 downward under the downward thrust generated by the pump pressure. The claws on the core tube locking joint 43 can shrink inwardly due to no internal obstruction, and escape from the annular clamping space 421 formed by the starting joint 212 and the starting sleeve 42, so that the core tube locking joint 43, the annular piston 41, the push-pull cylinder, the core tube joint 31 and the core tube 32 can be pressed downward into the formation for sampling.

[0046] When the annular piston 41 moves downward to the point where the piston outer seal exceeds the pressure relief hole 2131, the pressure is relieved and the pump pressure is reduced, indicating that the coring tube 32 has been completely pressed into the formation, and the sampling is completed. The push-in rope coring device 100 can be salvaged.

[0047] After sampling, the pressure relief hole 2131 can be sealed with a drain plug, and then the ground test joint 14 is connected to the drain hole 2151, and the pressure pump is connected to pressurize the lower cavity to push the annular piston 41 upward. Since the fixed piston 216 remains stationary, the core will be pushed out of the coring tube 32 to complete the core extraction operation.

[0048] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0049] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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 operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] In this application, unless otherwise clearly specified and limited, 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A press-in type rope coring device, characterized in that: Includes sealed connections in sequence: A joint assembly, wherein a water inlet hole is formed on the joint assembly, a liquid channel is formed inside the joint assembly, and the joint assembly is configured to be able to seal and abut against a seat ring of an external drilling tool assembly; A driving assembly, wherein a hydraulic chamber connected to the liquid channel is formed inside the driving assembly, the driving assembly comprises an external assembly and an internal assembly, wherein the internal assembly comprises: a connecting rod arranged in an axial direction; a piston-type motion assembly sealed and slidably arranged between the connecting rod and the external assembly, the piston-type motion assembly sealingly separates the hydraulic chamber into an upper chamber and a lower chamber, one end of the connecting rod is fixed to the joint assembly; a connecting transition portion sealed and slidably sleeved on the connecting rod, the connecting transition portion is sealed and fixedly connected to the piston-type motion assembly and is located in the lower chamber, the connecting transition portion and the connecting rod seal extend to the outside of the external assembly, a medium channel connected to the lower chamber is formed on the external assembly, and the medium channel is configured to be switchable; and A coring assembly, which is fixedly connected to the connecting transition portion, and the coring assembly is configured to be able to move axially under the drive of the piston-type motion assembly; The external assembly includes a tie rod locking joint, a starting joint, a sealing outer tube and a lower sealing joint which are sealed and fixedly connected in sequence. The tie rod locking joint is fixedly connected to the joint assembly, and the hydraulic chamber is connected to the liquid channel through a gap between the tie rod locking joint and the connecting rod; the connecting transition portion and the connecting rod extend to the outside through the lower sealing joint, and the medium channel is formed on the lower sealing joint; a pressure relief hole is formed at a preset position on the sealing outer tube.

2. The push-in rope coring device according to claim 1, characterized in that: The external assembly also includes a protective tube fixedly connected to the lower sealing joint, the coring assembly is arranged inside the protective tube, and a plurality of drainage holes are formed on the protective tube.

3. The push-in rope coring device according to claim 2, characterized in that: The external assembly also includes a fixed piston, which is fixedly connected to the end of the connecting rod. At the same time, the fixed piston is sealed and arranged inside the coring assembly.

4. The push-in type rope coring device according to claim 3, characterized in that: The coring assembly comprises: A coring pipe joint fixedly connected to the connecting transition portion, wherein a sealing sleeve of the coring pipe joint is arranged on the connecting rod; and A coring tube is detachably connected to the coring tube joint, one end of the coring tube is sleeved on the coring tube joint, and the fixed piston is sealingly and slidably arranged inside the coring tube.

5. The push-in type rope coring device according to claim 4, characterized in that: The core pipe joint has a plurality of radial hanging threaded holes evenly distributed along the circumferential direction, and a hanging hole matching the hanging threaded hole is formed on the core pipe, and the hanging hole is detachably connected to the core pipe joint through a core pipe hanging nail.

6. The push-in type rope coring device according to any one of claims 1 to 5, characterized in that: The piston motion assembly comprises: An annular piston, which is sealed and slidably sleeved on the connecting rod, and the connecting transition portion is fixedly connected to the annular piston; A starter sleeve is sleeved on the connecting rod and is located in the upper chamber. One end of the starter sleeve is sealed and slidably connected to the rod locking joint, and the other end of the starter sleeve is sealed and slidably connected to the starter joint. A gap is formed between the starter sleeve and the connecting rod, and an annular clamping space is formed between the starter sleeve and the starter joint; and The core tube locking joint has one end which is sealed and fixedly connected to the annular piston, and the other end which is clamped in the annular clamping space through a clamping claw.

7. The push-in type rope coring device according to claim 6, characterized in that: The starting joint is provided with a plurality of radial positioning threaded holes evenly distributed along the circumference, the positioning threaded holes are used for threaded connection with a positioning sleeve, a plurality of disc springs and positioning balls are installed in the positioning sleeve, an annular groove is formed on the outer peripheral wall of the starting sleeve, and the positioning ball is elastically abutted against the annular groove in a detachable manner.

8. The push-in type rope coring device according to any one of claims 1 to 5, characterized in that: The joint assembly includes a water inlet joint, a double female joint and a matching extension tube which are sealed and fixedly connected in sequence. A plurality of water inlet holes are formed on the water inlet joint, and the water inlet holes can be selectively threadedly connected with a ground test joint and / or a water inlet plug. An annular tool shoulder is formed on the outer peripheral wall of the water inlet joint, and the annular tool shoulder is used for sealing and abutting with the seat ring of the drill bit combination; the pull rod locking joint is sealed and fixedly connected with the matching extension tube, and a liquid channel connected to the hydraulic chamber is formed on one end of the matching extension tube connected to the pull rod locking joint, and the connecting pull rod is fixedly connected to the end of the matching extension tube.

9. The push-in type rope coring device according to any one of claims 1 to 5, characterized in that: It also includes a salvage mechanism, one end of which is provided with a salvage spear head, and the other end of which is provided with a connecting rod, and the connecting rod is used for fixed connection with the joint assembly.

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