Radial sealing control system of pressure-maintaining coring plate valve

Abstract

The invention relates to the technical field of pressure-maintaining coring, and provides a pressure-maintaining coring plate valve radial sealing control system which comprises a pipe structure. The plate valve impact mechanism is arranged in the pipe structure in a sleeved mode, located above the plate valve mechanism and connected with the pipe structure in an elastic suspension mode. The plate valve mechanism is connected with the pipe structure; the rock core inner pipe assembly is arranged in the plate valve mechanism, the plate valve impact mechanism and the pipe structure in a sleeving manner, and the rock core inner pipe assembly is elastically connected with the plate valve impact mechanism in a hanging manner. According to the sealing system for the pressure-maintaining coring plate valve, the sealing problem of the pressure-maintaining coring plate valve in a particle-containing slurry environment is solved through radial extrusion sealing.

Description

Technical Field

[0001] The present application relates to the technical field of pressure-maintaining coring, and in particular to a radial sealing control system of a pressure-maintaining coring plate valve. Background Art

[0002] Pressure coring is the only means to obtain in-situ pressure-maintained cores, which is conducive to comprehensive qualitative or quantitative analysis of reservoir samples. For plate valve sealing type pressure coring devices, the end face seal is usually used to compress the seal. When the end face contact pre-pressure is insufficient or there are particles on the sealing end face (mud environment containing rock debris particles), it is difficult to establish an initial seal, which affects the success rate of pressure coring sealing. In response to this problem, the present invention provides a pressure coring plate valve radial seal control system to solve the above-mentioned related sealing technology problems, which has a good effect. Summary of the invention

[0003] The present application provides a radial sealing control system for a pressure-maintaining coring plate valve, which has a good sealing effect.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions:

[0005] The present application provides a radial sealing control system for a pressure-maintaining coring plate valve, comprising:

[0006] Tube structure;

[0007] A plate valve impact mechanism, wherein the plate valve impact mechanism is sleeved in the pipe structure, and the plate valve impact mechanism is elastically suspended and connected to the pipe structure;

[0008] a plate valve mechanism, the plate valve mechanism being connected to the lower portion of the tube structure, and a portion of the plate valve mechanism being located below the plate valve impact mechanism;

[0009] A core inner tube assembly, wherein the core inner tube assembly is sleeved in the plate valve impact mechanism, the plate valve mechanism, and the tube structure, and the core inner tube assembly is elastically suspended and connected to the plate valve impact mechanism;

[0010] During coring, the core inner tube assembly is sleeved in the plate valve mechanism, the plate valve impact mechanism, and the tube structure;

[0011] After coring is completed, the core inner tube assembly drives the plate valve impact mechanism to move upward relative to the tube structure in the axial direction. When the core inner tube assembly moves upward to the upper part of the plate valve mechanism, the inner part of the plate valve mechanism rotates and closes the internal channel, and no seal is formed;

[0012] The core inner tube assembly drives the plate valve impact mechanism to move upward axially relative to the tube structure, and part of the plate valve impact mechanism slides downward axially relative to the tube structure to apply impact force and thrust to the plate valve mechanism, and the plate valve mechanism forms a radial extrusion seal.

[0013] In some embodiments, the plate valve mechanism comprises:

[0014] A plate valve cavity connecting pipe, the plate valve cavity connecting pipe is connected to the pipe structure and is located below the pipe structure;

[0015] A plate valve sealing joint, the plate valve sealing joint is connected to the plate valve cavity connecting pipe and is located below the plate valve cavity connecting pipe, and the inner wall of the plate valve sealing joint is provided with a sealing cone surface;

[0016] A plate valve, wherein the plate valve is rotatably connected to the plate valve sealing joint via a pin shaft, a plate valve cone surface is provided on the circumference of the plate valve, and a mounting groove is provided on the plate valve cone surface;

[0017] A plate valve radial seal, wherein the plate valve radial seal is arranged in the mounting groove;

[0018] A reed, the reed is fixedly connected to the plate valve, when coring, the core inner tube assembly is sleeved in the plate valve sealing joint and when the plate valve is erected, the reed contacts the plate valve cavity connecting tube and pushes the plate valve to contact the core inner tube assembly; and / or, a torsion spring, the torsion spring is arranged on the pin shaft;

[0019] After coring is completed, when the core inner tube assembly is located above the plate valve, the reed and / or the torsion spring push the plate valve to flip, and the plate valve cone flips around the pin shaft to approach the sealing cone surface, and the side of the plate valve radial seal close to the pin shaft contacts the plate valve cone surface, and the side of the plate valve radial seal away from the pin shaft does not contact the plate valve cone surface, and a radial extrusion seal is not formed, that is, the internal channel is closed and no seal is formed;

[0020] The core inner tube assembly drives the plate valve impact mechanism to move upward axially relative to the tube structure, and part of the plate valve impact mechanism slides downward axially relative to the tube structure to apply impact force and thrust to the plate valve, and the side of the plate valve radial seal away from the pin shaft contacts the plate valve conical surface to form a radial extrusion seal.

[0021] In some embodiments, the plate valve impact mechanism comprises:

[0022] A traction control part, wherein the traction control part is elastically suspended and connected to the core inner tube assembly, and the core inner tube assembly drives the traction control part to move upward in the axial direction;

[0023] The energy storage impact part comprises:

[0024] A flush pipe, wherein the bottom portion of the traction control portion is overlapped and inserted into the flush pipe, so that the top of the flush pipe is elastically suspended and connected to the pipe structure;

[0025] A driving spring, wherein the driving spring is pre-compressed and sleeved on the outer wall of the punch tube, one end of the driving spring abuts against the tube structure, and the other end abuts against the punch tube;

[0026] After coring is completed, the core inner tube assembly drives the traction control part to move upward in the axial direction, the traction control part is separated from the overlapping part of the energy storage impact part, the punch pipe is disconnected from the pipe structure, and the driving spring drives the punch pipe to move downward in the axial direction to apply external force to the plate valve mechanism.

[0027] In some embodiments, the flushing tube comprises:

[0028] A flushing tube body, wherein a plurality of first opening pieces are arranged on the top of the flushing tube body, a notch is provided between two adjacent first opening pieces, and the notches are arranged at equal intervals along the circumference of the flushing tube body to form a first elastic portion;

[0029] a first elastic suspension protrusion, wherein the first elastic suspension protrusion is fixedly connected to the first elastic part; when the bottom of the traction control part is inserted into the first elastic part, the traction control part constrains the first elastic part to undergo elastic deformation, and the first elastic suspension protrusion is radially expanded outwardly so that the first elastic suspension protrusion is elastically suspended and connected to the tube structure;

[0030] A shoulder portion, wherein the shoulder portion is arranged on the outer wall of the punch tube body near the bottom position, and the drive spring is sleeved on the outer wall of the punch tube body, one end of the drive spring abuts against the tube structure, and the other end abuts against the end surface of the shoulder portion facing the first elastic suspension protrusion to pre-tighten the drive spring.

[0031] In some embodiments, the traction control portion includes a traction tube:

[0032] The traction tube is elastically suspended and connected to the core inner tube assembly;

[0033] The traction tube comprises:

[0034] A traction tube body, wherein a plurality of second open pieces are arranged on the top of the traction tube body, a notch is provided between two adjacent second open pieces, and the notches are arranged at equal intervals along the circumference of the traction tube body to form a second elastic portion;

[0035] a second elastic suspension protrusion, wherein the second elastic suspension protrusion is fixedly connected to the second elastic portion;

[0036] The traction tube is inserted in the tube structure, and when the core inner tube assembly is inserted in the traction tube, the tube structure constrains the second elastic part to cause elastic deformation of the second elastic part, and the second elastic suspension protrusion is set inwardly in the radial direction, so that the second elastic suspension protrusion is elastically suspended and connected with the reduced diameter shoulder of the core inner tube assembly, and the traction tube body and the core inner tube assembly are clearance-matched, wherein the reduced diameter shoulder is set on the outer wall of the core inner tube assembly;

[0037] When the traction tube is not inserted into the tube structure, the second elastic suspension protrusion expands outward under the action of the core inner tube assembly, so that the core inner tube assembly is inserted into the traction tube;

[0038] The hanging protrusion is fixedly connected to the outer wall of the traction tube body close to the bottom.

[0039] In some embodiments, the traction control portion includes a release tube, the release tube comprising:

[0040] A release tube body, wherein a plurality of third open pieces are arranged on the top of the release tube body, a notch is provided between two adjacent third open pieces, and the notches are arranged at equal intervals along the circumference of the release tube body to form a third elastic portion;

[0041] a third elastic suspension protrusion, wherein the third elastic suspension protrusion is fixedly connected to the third elastic portion;

[0042] The release tube is inserted into the tube structure, the third elastic suspension protrusion is set inwardly in the radial direction, and the tube structure constrains the third elastic part to undergo elastic deformation, so that the inner diameter of the third elastic suspension protrusion is smaller than the outer diameter of the suspension protrusion;

[0043] When the release tube is not inserted into the tube structure, the third elastic suspension protrusion expands outward under the action of the suspension protrusion, so that the suspension protrusion is inserted into the release tube;

[0044] A reduced diameter portion, the reduced diameter portion is fixedly connected to the bottom of the release tube body, and the reduced diameter portion is overlapped and inserted in the flushing tube;

[0045] The core inner tube assembly drives the traction tube to move axially upward relative to the release tube until the suspension protrusion abuts against the third elastic suspension protrusion, and the traction tube drives the release tube to move axially upward relative to the punch tube. When the release tube moves upward until it is separated from the punch tube, the first elastic part of the punch tube contracts, the first elastic suspension protrusion shrinks radially, and the punch tube is disconnected from the tube structure.

[0046] The present application is provided with a tube structure, a plate valve impact mechanism, an inner tube assembly and a plate valve mechanism. Among them, the plate valve impact mechanism is sleeved in the tube structure, and the plate valve impact mechanism is elastically suspended and connected to the tube structure. The plate valve mechanism is connected to the lower part of the tube structure, and part of the plate valve mechanism is located below the plate valve impact mechanism. The core inner tube assembly is sleeved in the plate valve impact mechanism, the plate valve mechanism, and the tube structure, and the core inner tube assembly is elastically suspended and connected to the plate valve impact mechanism. When coring, the core inner tube assembly is sleeved in the plate valve mechanism, the plate valve impact mechanism, and the tube structure. After coring, the core inner tube assembly drives the plate valve impact mechanism to move upward relative to the tube structure in the axial direction. When the core inner tube assembly moves up to the top of part of the plate valve mechanism, the internal part of the plate valve mechanism rotates and closes the internal channel, and no seal is formed. The core inner tube assembly drives the plate valve impact mechanism to move upward relative to the tube structure in the axial direction, and part of the plate valve impact mechanism slides downward relative to the tube structure in the axial direction to apply impact force and thrust to the plate valve mechanism, and the plate valve mechanism forms a radial extrusion seal. Compared with the related art in which the plate valve mechanism only achieves sealing through pre-tightening force, the present application can also apply external force to the plate valve mechanism to improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 The radial sealing control system of the pressure-maintaining coring plate valve provided in the embodiment of the present application includes a portion of the pipe structure, a portion of the plate valve impact mechanism, a portion of the core inner pipe assembly and a plate valve structure in the first state;

[0049] Figure 2 for Figure 1 The second state intention of the middle structure;

[0050] Figure 3 for Figure 1 The third state intention of the middle structure;

[0051] Figure 4 for Figure 1 The fourth state intention of the middle structure;

[0052] Figure 5 for Figure 1 The fifth state intention of the middle structure;

[0053] Figure 6 for Figure 1 A partial enlarged view of the middle A;

[0054] Figure 7for Figure 5 A partial enlarged view of point B in the middle;

[0055] Figure 8 A schematic diagram of the structure of a core inner tube assembly in a radial sealing control system of a pressure-maintaining coring plate valve provided in an embodiment of the present application;

[0056] Fig. 9 A schematic diagram of the structure of the traction control part in the radial sealing control system of the pressure-maintaining coring plate valve provided in an embodiment of the present application;

[0057] Fig.10 A schematic diagram of the connection between the traction control part and the core inner tube assembly in the radial seal control system of the pressure-maintaining coring plate valve provided in an embodiment of the present application;

[0058] Fig.11 for Figure 4 A partial enlarged view of point C in the middle.

[0059] Description of reference numerals:

[0060] 100-tube structure; 110-short connector;

[0061] 200-plate valve impact mechanism; 210-traction control part; 211-traction tube; 2111-traction tube body; 2112-second elastic suspension protrusion; 2113-suspension protrusion; 2114-second elastic part; 212-release tube; 2121-release tube body; 2122-third elastic suspension protrusion; 2123-reduced diameter part; 2124-third elastic part; 220-energy storage impact part; 221-punch tube; 2211-punch tube body; 2212-first elastic suspension protrusion; 2213-shoulder part; 2214-first elastic part; 222-driving spring;

[0062] 300-core inner tube assembly; 310-quick connection male connector; 320-core inner tube assembly body; 321-reducing shoulder; 330-core tube; 340-stop spring; 350-second sealing part;

[0063] 400-plate valve mechanism; 410-plate valve cavity connecting pipe; 420-plate valve sealing joint; 421-sealing cone; 430-plate valve; 431-plate valve cone; 432-installation groove; 440-plate valve radial seal; 450-pin shaft; 460-reed;

[0064] 500-Drill Bit. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0066] In the related art, for the plate valve sealing type pressure-maintaining coring device, the end face sealing ring is usually used for contact compression sealing. When the end face contact pre-pressure is insufficient or there are particles on the sealing end face (mud environment containing rock cuttings particles), it is difficult to establish an initial seal, which affects the success rate of the pressure-maintaining coring seal.

[0067] To solve this problem, the present invention provides a radial sealing control system of a pressure-maintaining coring plate valve. After the pressure-maintaining coring is completed, when the core inner tube assembly moves up to a preset position, the plate valve mechanism flips over to cover the channel of the core inner tube assembly, and the plate valve impact mechanism further impacts the plate valve mechanism, pressing the plate valve mechanism into the sealing surface to form a radial extrusion seal, thereby establishing an effective initial seal, which is beneficial to improving the success rate of plate valve pressure-maintaining coring.

[0068] Specifically, the present application is provided with a tube structure, a plate valve impact mechanism, a core inner tube assembly and a plate valve mechanism. Among them, the plate valve impact mechanism is located in the tube structure, and the plate valve impact mechanism is slidably connected to the tube structure. Among them, the plate valve impact mechanism is sleeved in the tube structure, and the plate valve impact mechanism is elastically suspended and connected to the tube structure. The plate valve mechanism is connected to the lower part of the tube structure, and part of the plate valve mechanism is located below the plate valve impact mechanism. The core inner tube assembly is sleeved in the plate valve impact mechanism, the plate valve mechanism, and the tube structure, and the core inner tube assembly is elastically suspended and connected to the plate valve impact mechanism. When coring, the core inner tube assembly is sleeved in the plate valve mechanism, the plate valve impact mechanism, and the tube structure. After coring is completed, the core inner tube assembly drives the plate valve impact mechanism to move upward relative to the tube structure in the axial direction. When the core inner tube assembly moves up to the top of part of the plate valve mechanism, the inner part of the plate valve mechanism rotates and closes the internal channel, and no seal is formed. The core inner tube assembly drives the plate valve impact mechanism to move upward relative to the tube structure in the axial direction, and part of the plate valve impact mechanism slides downward relative to the tube structure in the axial direction to apply impact force and thrust to the plate valve mechanism, and the plate valve mechanism forms a radial extrusion seal. Compared with the related art in which the plate valve mechanism only forms an end face contact seal between the plate valve and the plate valve sealing joint through the torsion spring preload force, the present application further applies external force to the plate valve mechanism to realize the radial extrusion seal between the plate valve and the plate valve sealing joint, changes the sealing method, and improves the sealing success rate of the underground particle-containing environment.

[0069] The contents of the present application will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can understand the contents of the present application more clearly and in detail.

[0070] The present application provides a pressure-maintaining coring plate valve radial seal control system, which is part of a pressure-maintaining coring tool. The pressure-maintaining coring tool is arranged in an outer tube, and the outer tube drives the pressure-maintaining coring tool to rotate and advance, thereby coring. Exemplarily, the pressure-maintaining coring tool can be sent into the outer tube at the bottom of the well by a rope or directly dropped into the outer tube.

[0071] In this embodiment, the pressure-maintaining coring tool includes: a differential control part and a core pressure-maintaining part.

[0072] The differential control part can be used to realize the axial limit connection between the pressure-maintaining coring tool and the outer tube, and realize the in-situ pressure-maintaining sealing of the core pressure-maintaining part at the bottom of the well after the coring is completed. The differential control part is connected to the core pressure-maintaining part up and down along the axial direction.

[0073] See also Figures 1 to 7 As shown, specifically, the core pressure maintaining part includes: a pipe structure 100 , a plate valve impact mechanism 200 , a core inner pipe assembly 300 and a plate valve mechanism 400 .

[0074] The pipe structure 100 includes a short joint 110 .

[0075] The plate valve impact mechanism 200 is sleeved in the pipe structure 100 , and the plate valve impact mechanism 200 is elastically suspended and connected to the pipe structure 100 .

[0076] Among them, the plate valve mechanism 400 is connected to the lower part of the pipe structure 100 , and part of the plate valve mechanism 400 is located below the plate valve impact mechanism 200 .

[0077] The core inner tube assembly 300 is sleeved in the plate valve impact mechanism 200 , the plate valve mechanism 400 , and the pipe structure 100 , and the core inner tube assembly 300 is elastically suspended and connected to the plate valve impact mechanism 200 .

[0078] During coring, the core inner tube assembly 300 is sleeved in the plate valve mechanism 400, the plate valve impact mechanism 200, and the tube structure 100;

[0079] After coring is completed, the core inner tube assembly 300 drives the plate valve impact mechanism 300 to move upward axially relative to the tube structure 100. When the core inner tube assembly 300 moves up to the top of part of the plate valve mechanism 400, the internal part of the plate valve mechanism 400 rotates and closes the internal channel, and no seal is formed.

[0080] The core inner tube assembly 300 drives the plate valve impact mechanism 200 to move upward axially relative to the tube structure 100, and part of the plate valve impact mechanism 200 slides downward axially relative to the tube structure 100 to apply impact force and thrust to the plate valve mechanism 400, and the plate valve mechanism 400 forms a radial extrusion seal.

[0081] It is understandable that the plate valve impact mechanism 200 slides downward relative to the pipe structure 100 in the axial direction to apply external force to the plate valve mechanism 400, and the plate valve mechanism 400 closes the bottom of the core inner tube assembly 300 through the external force. Compared with the plate valve mechanism 400 in the related art, which only uses the torsion spring preload force to achieve the end face contact seal between the plate valve 430 and the plate valve sealing joint 420, the present application can also apply additional external force to the plate valve mechanism 400 to achieve radial extrusion seal between the plate valve 430 and the plate valve sealing joint 420, thereby improving the success rate of sealing.

[0082] The specific structure of the core inner tube assembly 300 is introduced below.

[0083] See also Figure 8 As shown, the core inner tube assembly 300 includes a quick-connect male connector 310, a core inner tube assembly body 320, a core tube 330 and a retaining spring 340. The core tube 330 may be a plastic core tube. The quick-connect male connector 310 is disposed at the top of the core inner tube assembly body 320 and is connected to the core inner tube assembly body 320. The core tube 330 is disposed at the bottom of the core inner tube assembly body 320 and is connected to the core inner tube assembly body 320. The retaining spring 340 is disposed at the bottom of the core tube 330 and is connected to the core tube 330.

[0084] A second sealing portion 350 is disposed on the outer wall of the core inner tube assembly body 320 .

[0085] A reduced diameter shoulder 321 is provided on the outer wall of the core inner tube assembly body 320 .

[0086] It should be noted that the core inner tube assembly body 320 may include a common structure of a pressure-maintaining section inner tube assembly in the related art, and this embodiment does not limit the specific structure of the core inner tube assembly body 320 .

[0087] The specific structure of the plate valve impact mechanism 200 is introduced below.

[0088] See also Fig. 9 and Fig.10 As shown, in some embodiments, the plate valve impact mechanism 200 includes: a traction control portion 210 and an energy storage impact portion 220 .

[0089] The traction control part 210 is elastically suspended and connected to the core inner tube assembly 300 , and the core inner tube assembly 300 drives the traction control part 210 to move upward in the axial direction.

[0090] See also Figures 1 to 6 As shown, the energy storage impact part 220 includes: an impact tube 221 and a driving spring 222 .

[0091] The bottom portion of the traction control portion 210 is overlapped and inserted into the flushing pipe 221 , so that the top of the flushing pipe 221 is elastically suspended and connected to the pipe structure 100 .

[0092] The driving spring 222 is pre-compressed and sleeved on the outer wall of the punch tube 221 , and one end of the driving spring 222 abuts against the tube structure 100 , and the other end abuts against the tube structure 100 .

[0093] After coring is completed, the core inner tube assembly 300 drives the traction control part 210 to move upward along the axial direction, the overlapping part of the traction control part 210 and the energy storage impact part 220 is separated, the impact pipe 221 is disconnected from the pipe structure 100, and the driving spring 222 drives the impact pipe 221 to move downward along the axial direction to apply external force to the plate valve mechanism 400.

[0094] Specifically, the flushing pipe 221 moves axially downward to generate an impact force on the plate valve mechanism 400, so that the plate valve mechanism 400 is closely attached to the inner wall of the pipe structure 100, thereby improving the reliability of the seal and being less susceptible to being affected by particle impurities on the contact surface.

[0095] In some embodiments, the wash pipe 221 includes a wash pipe body 2211 , a first elastic suspension protrusion 2212 , a shoulder portion 2213 and a first elastic portion 2214 .

[0096] Among them, a plurality of first opening pieces are arranged on the top of the punch tube body 2211 , and there is a gap between two adjacent first opening pieces. The gaps are arranged at equal intervals along the circumference of the punch tube body 2211 to form a first elastic portion 2214 .

[0097] The first elastic suspension protrusion 2212 is fixedly connected to the outer wall of the first elastic part 2214. When the bottom of the traction control part 210 is inserted into the first elastic part 2214, the traction control part 210 constrains the first elastic part 2214 to elastically deform, and the first elastic suspension protrusion 2212 is radially expanded outward, so that the first elastic suspension protrusion 2212 is elastically suspended and connected to the tube structure 100.

[0098] Among them, the shoulder portion 2213 is arranged on the outer wall of the punch tube body 2211 near the bottom position, and the driving spring 222 is sleeved on the outer wall of the punch tube body 2211. One end of the driving spring 222 abuts against the tube structure 100, and the other end abuts against the end surface of the shoulder portion 2213 facing the first elastic suspension protrusion 2212 to pre-tighten the driving spring 222.

[0099] It can be understood that the flushing pipe 221 provided in this embodiment has a simpler structure and is less difficult to process.

[0100] In some embodiments, the traction control portion 210 includes a traction tube 211 , which is elastically suspended and connected to the core inner tube assembly 300 .

[0101] In some embodiments, the traction tube 211 includes: a traction tube body 2111 , a second elastic suspension protrusion 2112 , a suspension protrusion 2113 and a second elastic portion 2114 .

[0102] Among them, a plurality of second open pieces are arranged on the top of the traction tube body 2111 , and there is a gap between two adjacent second open pieces. The gaps are arranged at equal intervals along the circumference of the traction tube body 2111 to form a second elastic portion 2114 .

[0103] The second elastic suspension protrusion 2112 is fixedly connected to the second elastic portion 2114 .

[0104] Among them, when the traction tube 211 is inserted into the tube structure 100 and the core inner tube assembly 300 is inserted into the traction tube 211, the tube structure 100 constrains the second elastic part 2114 to make the second elastic part 2114 elastically deformed, and the second elastic suspension protrusion 2112 is radially retracted to make the second elastic suspension protrusion 2112 elastically suspended and connected with the reduced diameter shoulder 321 of the core inner tube assembly 300, and the traction tube body 2111 and the core inner tube assembly 300 are clearance-matched.

[0105] When the traction tube 211 is not inserted into the tube structure 100 , the second elastic suspension protrusion 2112 expands outwards under the action of the core inner tube assembly 300 , so that the core inner tube assembly 300 is inserted into the traction tube 211 .

[0106] The hanging protrusion 2113 is fixedly connected to the outer wall of the traction tube body 2111 close to the bottom.

[0107] In some embodiments, the traction control portion 210 includes a release tube 212 .

[0108] In some embodiments, the release tube 212 includes a release tube body 2121 , a third elastic suspension protrusion 2122 , a reduced diameter portion 2123 and a third elastic portion 2124 .

[0109] Among them, a plurality of third open pieces are arranged on the top of the release tube body 2121 , and there is a gap between two adjacent third open pieces. The gaps are arranged at equal intervals along the circumference of the release tube body 2121 to form a third elastic portion 2124 .

[0110] The third elastic suspension protrusion 2122 is fixedly connected to the third elastic portion 2124 .

[0111] The release tube 212 is inserted into the tube structure 100, and the third elastic suspension protrusion 2122 is set to be radially inwardly contracted. The tube structure 100 constrains the third elastic part 2124 to elastically deform, so that the inner diameter of the third elastic suspension protrusion 2122 is smaller than the outer diameter of the suspension protrusion 2113;

[0112] When the release tube 212 is not inserted into the tube structure 100 , the third elastic suspension protrusion 2122 expands outwards under the action of the suspension protrusion 2113 , so that the suspension protrusion is inserted into the release tube 212 .

[0113] The reduced diameter portion 2123 is fixedly connected to the bottom of the release tube body 2121 , and the reduced diameter portion 2123 is overlapped and inserted in the flushing tube 221 .

[0114] The core inner tube assembly 300 drives the traction tube 211 to move axially upward relative to the release tube 212 until the suspension protrusion abuts against the third elastic suspension protrusion 2122. The traction tube 211 drives the release tube 212 to move axially upward relative to the flushing tube 221. When the release tube 212 moves upward until it is separated from the flushing tube 221, the first elastic part 2214 of the flushing tube 221 contracts, and the first elastic suspension protrusion 2212 shrinks radially inward, and the flushing tube 221 is disconnected from the tube structure 100.

[0115] The specific structure of the plate valve mechanism 400 is introduced below.

[0116] See also Figure 7 and Fig.11 As shown, in some embodiments, the plate valve mechanism 400 includes a plate valve cavity connecting pipe 410 , which is connected to the tube structure and is located below the tube structure 100 .

[0117] The plate valve mechanism 400 includes a plate valve sealing joint 420, which is connected to the plate valve cavity connecting pipe 410 and is located below the plate valve cavity connecting pipe 410. The plate valve sealing joint 420 is connected to the drill bit 500.

[0118] Exemplarily, the short joint 110 and the plate valve cavity connecting pipe 410 are connected by pipe threads. A first sealing member is provided between the short joint 110 and the plate valve cavity connecting pipe 410 for sealing. The plate valve cavity connecting pipe 410 and the plate valve sealing joint 420 are connected by pipe threads. A third sealing member is provided between the plate valve cavity connecting pipe 410 and the plate valve sealing joint 420 for sealing.

[0119] The inner wall of the plate valve sealing joint 420 is provided with a sealing cone surface 421. Along the axial direction, from top to bottom, the radial dimension of the sealing cone surface 421 gradually decreases.

[0120] The plate valve mechanism 400 includes a plate valve 430, which is rotatably connected to the plate valve sealing joint 420 via a pin 450. A plate valve cone surface 431 is provided on the circumference of the plate valve 430. The radial dimension of the plate valve cone surface 431 gradually increases from top to bottom along the axial direction.

[0121] The plate valve conical surface 431 is provided with a mounting groove 432 .

[0122] The plate valve mechanism 400 includes a plate valve radial seal 440 , which is disposed in the mounting groove 432 .

[0123] The plate valve mechanism 400 includes a reed 460, which is fixedly connected to the plate valve 430. When coring, the core inner tube assembly 300 is sleeved in the plate valve sealing joint 420, and when the plate valve 430 stands up, the reed 460 contacts the plate valve cavity connecting tube 410 and pushes the plate valve 430 to contact the core inner tube assembly 300.

[0124] And / or, the plate valve mechanism 400 includes a torsion spring, and the torsion spring is disposed on the pin 450 .

[0125] It should be noted that the plate valve mechanism 400 may include a reed 460, or the plate valve mechanism 400 may include a torsion spring. Alternatively, the plate valve mechanism 400 may include both the reed 460 and the torsion spring. Alternatively, the plate valve mechanism 400 may include other elastic members that can provide elastic force, such as elastic rubber.

[0126] After coring is completed, when the core inner tube assembly 300 is located above the plate valve 430, the reed 460 and / or the torsion spring pushes the plate valve 430 to flip, and the plate valve cone 431 flips around the pin shaft 450 and approaches the sealing cone surface 421. The side of the plate valve radial seal 440 close to the pin shaft 450 contacts the plate valve cone surface 431, and the side of the plate valve radial seal 440 away from the pin shaft 450 does not contact the plate valve cone surface 431, and no radial extrusion seal is formed, that is, the internal channel is closed and no seal is formed.

[0127] It should be noted that the plate valve 430 can be turned over under the elastic force of the reed 460. Alternatively, the plate valve 430 can be turned over under the elastic force of the torsion spring. Alternatively, the plate valve 430 can be turned over under the combined elastic force of the reed 460 and the torsion spring.

[0128] The core inner tube assembly 300 drives the plate valve impact mechanism 200 to move upward relative to the tube structure 100 in the axial direction, and part of the plate valve impact mechanism 200 slides downward relative to the tube structure 100 in the axial direction to apply impact force and thrust to the plate valve 430, and the side of the plate valve radial seal 440 away from the pin 450 contacts the plate valve conical surface 431 to form a radial extrusion seal. Among them, the plate valve radial seal 440 is in a state of being squeezed, deformed and sealed.

[0129] See also Figures 1 to 7 As shown, the working process of the radial seal control system of the pressure-maintaining coring plate valve is described below:

[0130] During coring, the plate valve mechanism 400 is located between the core inner tube assembly 300 and the pipe structure 100 , and the core inner tube assembly 300 compresses the plate valve mechanism 400 , so that the plate valve mechanism 400 is close to the inner wall of the pipe structure 100 .

[0131] After coring is completed, the core inner tube assembly 300 drives the traction tube 211 to move axially upward relative to the release tube 212. When the core inner tube assembly 300 is located above the plate valve 430, the reed 460 and / or the torsion spring pushes the plate valve 430 to flip, and the plate valve cone surface 431 flips around the pin shaft 450 to approach the sealing cone surface 421. The side of the plate valve radial seal 440 close to the pin shaft 450 contacts the plate valve cone surface 431, and the side of the plate valve radial seal 440 away from the pin shaft 450 does not contact the plate valve cone surface 431, and no radial extrusion seal is formed, that is, the initial seal.

[0132] Then, the core inner tube assembly 300 drives the traction tube 211 to move axially upward relative to the release tube 212 until the suspension protrusion 2113 abuts against the third elastic suspension protrusion 2122, and the traction tube 211 drives the release tube 212 to move axially upward relative to the flushing tube 221. When the release tube 212 moves upward until it is separated from the flushing tube 221, the first elastic part 2214 of the flushing tube 221 contracts, and the first elastic suspension protrusion 2212 shrinks radially, and the flushing tube 221 is disconnected from the tube structure 100.

[0133] The flushing pipe 221 slides downward relative to the pipe structure 100 in the axial direction to exert impact force and thrust on the plate valve 430, and the side of the plate valve radial seal 440 away from the pin 450 contacts the plate valve conical surface 431 to form a radial extrusion seal. The plate valve radial seal 440 is in a state of being squeezed, deformed and sealed.

[0134] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0135] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0136] It should be easily understood that the terms “on,” “above,” and “over” in this application should be interpreted in the broadest manner, so that “on” means not only “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above something” or “over,” but also may include the meaning of “above something” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0137] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90° or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0138] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0139] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0140] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", 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 application 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 should not be understood as a limitation on the present application.

[0141] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0142] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application 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 with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A radial sealing control system for a pressure-maintaining coring plate valve, characterized in that: include: Tube structure (100); A plate valve impact mechanism (200), wherein the plate valve impact mechanism (200) is sleeved in the tube structure (100), and the plate valve impact mechanism (200) is elastically suspended and connected to the tube structure (100); a plate valve mechanism (400), the plate valve mechanism (400) being connected to the lower part of the tube structure (100), and a portion of the plate valve mechanism (400) being located below the plate valve impact mechanism (200); A core inner tube assembly (300), wherein the core inner tube assembly (300) is sleeved inside the plate valve impact mechanism (200), the plate valve mechanism (400), and the tube structure (100), and the core inner tube assembly (300) is elastically suspended and connected to the plate valve impact mechanism (200); During coring, the core inner tube assembly (300) is sleeved inside the plate valve mechanism (400), the plate valve impact mechanism (200), and the tube structure (100); After coring is completed, the core inner tube assembly (300) drives the plate valve impact mechanism (200) to move upward relative to the tube structure (100) in the axial direction. When the core inner tube assembly (300) moves upward to a part of the plate valve mechanism (400), the inner part of the plate valve mechanism (400) rotates to close the internal channel, and no seal is formed. The core inner tube assembly (300) drives the plate valve impact mechanism (200) to move upwards in the axial direction relative to the tube structure (100), and a portion of the plate valve impact mechanism (200) slides downwards in the axial direction relative to the tube structure (100) to apply an impact force and a thrust force to the plate valve mechanism (400), so that the plate valve mechanism (400) forms a radial extrusion seal.

2. The radial sealing control system of the pressure-maintaining coring plate valve according to claim 1, characterized in that: The plate valve mechanism (400) comprises: A plate valve cavity connecting pipe (410), the plate valve cavity connecting pipe (410) being connected to the pipe structure (100) and being located below the pipe structure (100); a plate valve sealing joint (420), the plate valve sealing joint (420) being connected to the plate valve cavity connecting pipe (410) and being located below the plate valve cavity connecting pipe (410), the inner wall of the plate valve sealing joint (420) being provided with a sealing cone surface (421); A plate valve (430), the plate valve (430) being rotatably connected to the plate valve sealing joint (420) via a pin shaft (450), a plate valve conical surface (431) being provided on the circumference of the plate valve (430), and a mounting groove (432) being provided on the plate valve conical surface (431); A plate valve radial seal (440), wherein the plate valve radial seal (440) is arranged in the mounting groove (432); a reed (460), the reed (460) being fixedly connected to the plate valve (430), and when coring, the core inner tube assembly (300) is sleeved in the plate valve sealing joint (420), and when the plate valve (430) is erected, the reed (460) contacts the plate valve cavity connecting tube (410) and pushes the plate valve (430) to contact the core inner tube assembly (300); and / or a torsion spring, the torsion spring being arranged on the pin shaft (450); After coring is completed, when the core inner tube assembly (300) is located above the plate valve (430), the reed (460) and / or the torsion spring push the plate valve (430) to flip, and the plate valve cone (431) flips around the pin shaft (450) to approach the sealing cone surface (421), and the side of the plate valve radial seal (440) close to the pin shaft (450) contacts the plate valve cone surface (431), and the side of the plate valve radial seal (440) away from the pin shaft (450) does not contact the plate valve cone surface (431), and a radial extrusion seal is not formed, that is, the internal channel is closed and no seal is formed; The core inner tube assembly (300) drives the plate valve impact mechanism (200) to move upward in the axial direction relative to the tube structure (100), and a portion of the plate valve impact mechanism (200) slides downward in the axial direction relative to the tube structure (100) to apply an impact force and a thrust force to the plate valve (430), and the side of the plate valve radial seal (440) away from the pin shaft (450) contacts the plate valve conical surface (431), thereby forming a radial extrusion seal.

3. The radial sealing control system of the pressure-maintaining coring plate valve according to claim 2, characterized in that: The plate valve impact mechanism (200) comprises: A traction control part (210), the traction control part (210) being elastically suspended and connected to the core inner tube assembly (300), the core inner tube assembly (300) driving the traction control part (210) to move axially upward; An energy storage impact part (220), wherein the energy storage impact part (220) comprises: A flushing pipe (221), wherein the bottom portion of the traction control portion (210) is overlapped and inserted into the flushing pipe (221), so that the top of the flushing pipe (221) is elastically suspended and connected to the pipe structure (100); a driving spring (222), wherein the driving spring (222) is pre-compressed and sleeved on the outer wall of the punch tube (221), one end of the driving spring (222) abuts against the tube structure (100), and the other end abuts against the punch tube (221); After coring is completed, the core inner tube assembly (300) drives the traction control part (210) to move upward in the axial direction, the overlapping part of the traction control part (210) and the energy storage impact part (220) is separated, the impact tube (221) is disconnected from the tube structure (100), and the driving spring (222) drives the impact tube (221) to move downward in the axial direction to apply an external force to the plate valve mechanism (400).

4. The radial sealing control system of the pressure-maintaining coring plate valve according to claim 3 is characterized in that: The flushing pipe (221) comprises: A flushing tube body (2211), wherein a plurality of first open pieces are arranged at the top of the flushing tube body (2211), a notch is provided between two adjacent first open pieces, and the notches are arranged at equal intervals along the circumference of the flushing tube body (2211) to form a first elastic portion (2214); a first elastic suspension protrusion (2212), the first elastic suspension protrusion (2212) being fixedly connected to the outer wall of the first elastic part (2214); when the bottom of the traction control part (210) is inserted into the first elastic part (2214), the traction control part (210) constrains the first elastic part (2214) to undergo elastic deformation, and the first elastic suspension protrusion (2212) is radially expanded outwardly so that the first elastic suspension protrusion (2212) and the tube structure (100) are elastically suspended and connected; A shoulder portion (2213), wherein the shoulder portion (2213) is arranged on the outer wall of the punch tube body (2211) near the bottom, and the drive spring (222) is sleeved on the outer wall of the punch tube body (2211), and one end of the drive spring (222) abuts against the tube structure (100), and the other end abuts against the end surface of the shoulder portion (2213) facing the first elastic suspension protrusion (2212) to pre-tighten the drive spring (222).

5. The radial sealing control system of the pressure-maintaining coring plate valve according to claim 4, characterized in that: The traction control part (210) comprises a traction tube (211): The traction tube (211) is elastically suspended and connected to the core inner tube assembly (300); The traction tube (211) comprises: A traction tube body (2111), wherein a plurality of second open pieces are arranged at the top of the traction tube body (2111), a notch is provided between two adjacent second open pieces, and the notches are arranged at equal intervals along the circumference of the traction tube body (2111) to form a second elastic portion (2114); A second elastic suspension protrusion (2112), wherein the second elastic suspension protrusion (2112) is fixedly connected to the second elastic portion (2114); When the traction tube (211) is inserted into the tube structure (100) and the core inner tube assembly (300) is inserted into the traction tube (211), the tube structure (100) constrains the second elastic portion (2114) so ​​that the second elastic portion (2114) undergoes elastic deformation, and the second elastic suspension protrusion (2112) is radially inwardly contracted so that the second elastic suspension protrusion (2112) is elastically suspended and connected to a reduced diameter shoulder (321) of the core inner tube assembly (300), and the traction tube body (2111) and the core inner tube assembly (300) are clearance-matched, wherein the reduced diameter shoulder (321) is arranged on the outer wall of the core inner tube assembly (300); When the traction tube (211) is not inserted into the tube structure (100), the second elastic suspension protrusion (2112) expands outwards under the action of the core inner tube assembly (300), so that the core inner tube assembly (300) is inserted into the traction tube (211); A hanging protrusion (2113) is fixedly connected to an outer wall of the traction tube body (2111) close to the bottom.

6. The radial sealing control system for the pressure-maintaining coring plate valve according to claim 5, characterized in that: The traction control portion (210) includes a release tube (212), and the release tube (212) includes: A release tube body (2111), wherein a plurality of third open pieces are arranged at the top of the release tube body (2111), a notch is provided between two adjacent third open pieces, and the notches are arranged at equal intervals along the circumference of the release tube body (2111) to form a third elastic portion (2124); A third elastic suspension protrusion (2122), the third elastic suspension protrusion (2122) being fixedly connected to the third elastic portion (2124); The release tube (212) is inserted into the tube structure (100), the third elastic suspension protrusion (2122) is radially inwardly contracted, and the tube structure (100) constrains the third elastic portion (2124) to undergo elastic deformation, so that the inner diameter of the third elastic suspension protrusion (2122) is smaller than the outer diameter of the suspension protrusion (2113); When the release tube (212) is not inserted into the tube structure (100), the third elastic suspension protrusion (2122) expands outwards under the action of the suspension protrusion (2113), so that the suspension protrusion (2113) is inserted into the release tube (212); A reduced diameter portion (2123), the reduced diameter portion (2123) being fixedly connected to the bottom of the release tube body (2111), and the reduced diameter portion (2123) being overlapped and inserted in the flushing tube (221); The core inner tube assembly (300) drives the traction tube (211) to move axially upward relative to the release tube (212) until the suspension protrusion (2113) abuts against the third elastic suspension protrusion (2122), and the traction tube (211) drives the release tube (212) to move axially upward relative to the flushing tube (221). When the release tube (212) moves upward until it is separated from the flushing tube (221), the first elastic part (2214) of the flushing tube (221) contracts, the first elastic suspension protrusion (2212) shrinks radially inward, and the flushing tube (221) is disconnected from the tube structure (100).

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