CN209742825U

CN209742825U - safe type natural gas hydrate rotary pressure-maintaining coring device

Info

Publication number: CN209742825U
Application number: CN201920267024.1U
Authority: CN
Inventors: 秦绪文; 叶建良; 邱海峻; 谢文卫; 卢秋平; 梁金强; 张伟; 寇贝贝; 匡增桂; 熊亮; 申凯翔; 李彬; 陈靓
Original assignee: Guangzhou Marine Geological Survey
Current assignee: Guangzhou Marine Geological Survey
Priority date: 2019-03-01
Filing date: 2019-03-01
Publication date: 2019-12-06
Anticipated expiration: 2029-03-01

Abstract

the utility model relates to a safe natural gas hydrate rotary pressure maintaining coring device, which comprises an outer pipe assembly and an inner pipe assembly arranged inside the outer pipe assembly, wherein a drill bit is arranged at the bottom end of the outer pipe assembly; the inner pipe assembly comprises an inner pipe assembly a and an inner pipe assembly b, the inner pipe assembly b is installed inside the inner pipe assembly a and can move axially along the inner pipe assembly a, and the inner pipe assembly a comprises a fishing spearhead, an elastic clamping mechanism, a piston pipe, a middle pipe nipple, a sealing nipple, an energy accumulator connecting pipe, a middle pipe and a pressure maintaining ball valve overturning sealing mechanism which are sequentially connected from top to bottom; the inner pipe assembly b comprises a lifting device, a connecting mechanism, an elastic clamp suspension mechanism, a single-action mechanism, a conversion joint, an adjusting joint, an energy accumulator connecting pipe, a sealing mechanism, a temperature and pressure instrument connecting pipe, a core pipe connecting short section and a core pipe which are sequentially connected from top to bottom. The utility model discloses safe type rotation pressurize sample can adapt to fourth system sedimentary stratum and basement rock, uses more reliably.

Description

safe type natural gas hydrate rotary pressure-maintaining coring device

Technical Field

the utility model relates to a probing technical field specifically is a safe type natural gas hydrate rotation pressurize corer of natural gas hydration.

background

the natural gas hydrate is a high-efficiency clean energy with rich resources, and is a strategic high point of future global energy development, the natural gas hydrate is present below the seabed of a deep sea big land slope or is buried in sediments in polar regions, and the natural gas hydrate needs to be kept stable in a stable pressure maintaining state without decomposition, and needs to be collected in a pressure maintaining mode. The method that the core barrel is pulled out of the pressure maintaining ball valve and then the ball valve is closed by shearing and triggering of the shear pin is adopted, and due to unstable work of the shear pin, the core barrel is sheared by collision and impact in the process of putting the core barrel in the core extractor. Once the bolt is sheared by impact, the inner pipe assembly of the coring device is easy to be disengaged in advance, and then the ball valve is closed in advance to cause coring failure, so that the coring device using the shearing pin has poor reliability and poor safety. Therefore, it is an urgent problem to provide a reliable coring apparatus with good pressure maintaining effect.

SUMMERY OF THE UTILITY MODEL

the not enough to prior art, the utility model provides a safe type natural gas hydrate rotation pressurize coring device, it can realize the pressurize coring, and reliability, security are high and the coring success rate is high and can adapt to the stereoplasm stratum and carry out the coring.

the technical scheme of the utility model is that: a safe natural gas hydrate rotary pressure-maintaining coring device comprises an outer pipe assembly and an inner pipe assembly arranged in the outer pipe assembly, wherein a drill bit is arranged at the bottom end of the outer pipe assembly;

the inner pipe assembly comprises an inner pipe assembly a and an inner pipe assembly b, wherein the inner pipe assembly a comprises a fishing spearhead, an elastic clamping mechanism, a piston pipe, a middle pipe short section, a sealing short section, an energy accumulator connecting pipe, a middle pipe and a pressure maintaining ball valve overturning sealing mechanism which are sequentially connected from top to bottom; the inner pipe assembly b comprises a lifting device, a connecting mechanism, an elastic clamp suspension mechanism, a single-action mechanism, a conversion joint, an adjusting joint, an energy accumulator connecting pipe, a sealing mechanism, a temperature and pressure instrument connecting pipe, a core pipe connecting short section and a core pipe which are sequentially connected from top to bottom; the lower part of the bullet clip hanging mechanism is arranged in the middle pipe short section, and the fishing spearhead is used for driving the bullet clip hanging mechanism to move towards the direction far away from the middle pipe short section; the inner pipe assembly b is axially fixed inside the inner pipe assembly a through the elastic clamping suspension mechanism, and can move upwards and axially along the inner pipe assembly a when in a clamping-releasing state, wherein the clamping-releasing state is as follows: the elastic clamp hanging mechanism is separated from the middle pipe short section;

The elastic clamp mechanism and the elastic clamp hanging mechanism are mutually matched, so that the core barrel is axially fixed before fishing and coring;

The core tube is positioned inside the middle tube;

the pressure maintaining ball valve overturning sealing mechanism comprises a spring limiting ring, a ball valve driving nipple, a spring, a ball valve driving nipple spring shoulder, a ball valve pipe shoulder, an upper ball valve seat sealing ring, an upper ball valve seat, a ball valve pipe, a ball valve overturning driving bolt, a ball valve shaft, a ball valve overturning sliding groove, a ball valve pipe long round hole, a ball valve pipe window, a lower ball valve seat sealing ring, a bearing spring and a ball valve lower gland; the ball valve is provided with a ball valve shaft and a ball valve overturning sliding groove, and the ball valve is provided with a through hole for the core tube to pass through;

the upper end of a ball valve pipe is connected with the lower end of the middle pipe, a ball valve pipe sealing ring is arranged at the joint of the ball valve pipe and the middle pipe, a ball valve pipe window is arranged in the hollow part of the ball valve pipe, a ball valve pipe long round hole is arranged in the middle of the ball valve pipe, a ball valve overturning driving bolt positioned in the ball valve pipe long round hole is fixed on the ball valve pipe, and the ball valve overturning driving bolt extends into a ball valve overturning sliding groove on the ball valve;

the ball valve is fixedly arranged in a ball valve pipe window on the ball valve pipe through a ball valve shaft, one end of the ball valve shaft is connected with the ball valve, and the other end of the ball valve shaft extends into the ball valve pipe long circular hole and can rotate and slide in the ball valve pipe long circular hole;

an upper ball valve seat and a lower ball valve seat are arranged inside the ball valve pipe, the upper ball valve seat and the lower ball valve seat can axially slide in the ball valve pipe, a ball valve pipe shoulder is arranged at the upper end of the ball valve pipe, and the ball valve pipe is connected with the middle pipe;

the upper end of an upper ball valve seat is connected with the lower end of a ball valve driving nipple, the lower end of the upper ball valve seat is in contact with the upper end of a ball valve, the ball valve driving nipple is located below a core barrel connecting nipple, the ball valve driving nipple is located between a core barrel and a middle barrel, a spring is further arranged between the ball valve driving nipple and the middle barrel, the spring is sleeved on the ball valve driving nipple, the upper end of the spring is in contact with a spring limiting ring, the spring limiting ring is limited by a middle barrel shoulder through concave-convex matching, the spring limiting ring is located between the core barrel and the middle barrel, the lower end of the spring is in contact with the ball valve driving nipple spring shoulder and is propped by the ball valve driving nipple spring shoulder, the ball valve driving nipple spring shoulder props against the spring limiting ring through the spring, and;

the pressure maintaining ball valve overturning sealing mechanism is matched with the core pipe to realize downward sliding and 90-degree overturning of the ball valve;

The single-action mechanism is positioned inside the middle pipe nipple and below the elastic pin nipple, the single-action mechanism is connected with the adapter through a bearing outer sleeve, the adapter is connected with the upper end of the adjusting joint, an adjusting mechanism locking nut is sleeved on the adjusting joint and arranged at the lower end of the adapter, the adjusting joint is positioned inside the connecting pipe, the lower end of the adjusting joint is connected with the upper end of the connecting pipe, and the lower end of the connecting pipe is connected with the sealing mechanism; the sealing mechanism is positioned inside the middle pipe and can move axially along the middle pipe;

the connecting mechanism is arranged in the piston tube and comprises an upper part and a lower part, wherein the upper part comprises a joint, a joint inner cavity, a piston inner cavity shoulder, a piston inner cavity guide hole and an elastic bolt pulling hole, and the lower part comprises a bolt positioning cylinder, a first bolt sliding hole, a bolt spring, a sliding bolt, a spring pressing ring, a supporting spring, an inserting connecting rod, a connecting rod spring shoulder and a second bolt sliding hole;

the upper end of the joint is connected with the lower end of the pipe fitting, the upper part of the joint is positioned inside the bracket pipe, the upper end of the pipe fitting is connected with the lower end of the lifting pipe, the lower part of the pipe fitting is provided with a water outlet of the pipe fitting, and the water outlet of the pipe fitting is positioned above the joint; the lower end of the connector is connected with the piston, the connector is provided with a connector inner cavity, the bottom of the piston is provided with a transversely arranged elastic bolt pulling hole, the lower part of the elastic bolt pulling hole is provided with a piston inner cavity guide hole and a piston inner cavity shoulder, the piston inner cavity guide hole is provided with an axial channel, the outer wall of the piston inner cavity guide hole is contacted with the inner wall of the piston tube, the piston inner cavity shoulder is positioned at the top of the piston inner cavity guide hole, the bottom of the piston tube is provided with a piston tube water outlet, the piston tube water outlet is positioned below the elastic bolt pulling hole, and the lower end of the piston inner cavity guide hole is connected with the spring pressing ring;

the inserted connecting rod sequentially penetrates through an axial channel formed by the spring pressing ring and the piston inner cavity guide hole 2 and then extends into the joint inner cavity of the joint, a connecting rod spring shoulder is arranged at the lower end of the inserted connecting rod, a supporting spring is sleeved at the lower part of the inserted connecting rod and is positioned between the spring pressing ring and the connecting rod spring shoulder;

the upper part of the inserted connecting rod is provided with a second bolt sliding hole which is transversely arranged, a bolt positioning cylinder and a sliding bolt which are transversely arranged are arranged in the second bolt sliding hole, a first bolt sliding hole is arranged in the bolt positioning cylinder, the sliding bolt comprises a body arranged in the second bolt sliding hole and an extension part arranged outside the inserted connecting rod, a bolt spring is sleeved on the body of the sliding bolt, the body of the sliding bolt extends into the first bolt sliding hole and can transversely move along the first bolt sliding hole, and the aperture of the bolt spring is larger than that of the first bolt sliding hole;

when the sliding bolt reaches the up limit position, the extension part of the sliding bolt extends into the elastic bolt pulling hole; when the piston reaches the descending limit position, the water outlet of the piston pipe is positioned above the piston and communicated with the water outlet of the matched pipe.

Furthermore, when the core tube passes through the through hole of the ball valve downwards, the edge of the ball valve is tightly attached to the core tube, the core tube limits the ball valve to turn downwards, meanwhile, the ball valve is contacted by the core tube to enable the ball valve to upwards prop against the upper ball valve seat, and the spring limiting ring is limited by the shoulder of the middle tube on the lower middle tube; when the core tube is pulled upwards from the through hole of the ball valve, the ball valve is separated from the core tube and overturned by 90 degrees, and when the ball valve reaches a descending limit position, the bearing spring is compressed to a lower ball valve seat to be contacted with a lower pressing cover of the ball valve.

furthermore, the lower end of the pressure maintaining ball valve overturning sealing mechanism is connected with a flushing mechanism for flushing the core barrel, the flushing mechanism is provided with a water outlet flow channel, and the water outlet flow channel is a gap between the outer pipe drill bit and the middle pipe drill bit and a gap between the core barrel and the middle pipe drill bit.

further, sealing mechanism includes that quick-insertion check valve pressure measurement connects, pressure channel, sealing joint sealing washer, sealing joint and sealing joint circular bead, and sealing joint's upper end is connected with the lower extreme of energy storage ware connecting pipe, and the sealing joint middle part is equipped with axial pressure channel, and quick-insertion check valve pressure measurement connects and stretches into to the pressure channel in, and the last cover of sealing joint is equipped with the sealing joint sealing washer, and the sealing joint both sides are equipped with the sealing joint circular bead, and sealing joint's lower extreme is connected with the upper end of warm pressure appearance connecting pipe.

furthermore, an upper ball valve seat sealing ring is arranged at the joint of the ball valve pipe and the upper ball valve seat, and a lower ball valve seat sealing ring is arranged at the joint of the ball valve pipe and the lower ball valve seat; the lower ball valve seat is provided with a bearing spring and a ball valve lower gland from top to bottom, the upper end and the lower end of the bearing spring are respectively connected with the lower ball valve seat and the ball valve lower gland, and the upper end of the lower ball valve seat is contacted with the lower end of the ball valve.

further, the ball valve is in floating contact with the lower ball valve seat.

Further, bullet card mechanism includes bullet card a, bullet card bracket a, takes off the card pipe, the water inlet, the long pinhole of bullet card bracket pipe, bullet card bracket pipe an, take off the card pipe rake, bullet card a sets up in the bullet card is indoor, and be connected with bullet card bracket a, bullet card room sets up the inner wall at the outer tube assembly, bullet card bracket a connects and sets up inside taking off the card pipe, it takes off the card pipe and drags for spearhead fixed connection to take off the card pipe, the bottom that takes off the card pipe is equipped with and is used for taking off the card pipe rake that the card came out from bullet card room, be equipped with the water inlet on the lateral wall that takes off the card pipe, bullet card bracket pipe long pin hole sets up inside the lumen of bullet card bracket pipe a.

further, the lifting device comprises a lifting pipe, a lifting pipe long pin hole and a first elastic pin, wherein the lifting pipe long pin hole is formed in the lifting pipe; the first elastic pin penetrates through the long pin hole of the elastic clamping bracket pipe and the long pin hole of the lifting pipe and then is fixedly arranged on the releasing clamping pipe, the central axes of the long pin hole of the elastic clamping bracket pipe and the long pin hole of the lifting pipe are on the same straight line, and the lifting pipe, the elastic clamping bracket pipe a and the releasing clamping pipe are connected in a sleeved mode.

furthermore, the elastic clip hanging mechanism comprises an elastic clip bracket b, a clip releasing pipe b, an elastic clip cavity, an elastic clip hole, an elastic clip cavity, an elastic clip b, an elastic clip bracket short section and a clip releasing pipe inclined part b; the upper part of the elastic clip hanging mechanism is arranged in the piston tube, and the fishing spearhead is used for driving the inclined part b of the card releasing tube to move towards the direction close to the elastic clip piece b, so that the elastic clip piece b is disconnected from the middle tube short section.

Furthermore, the single-acting mechanism comprises an upper thrust bearing, a mandrel, a copper sleeve, a bearing outer sleeve, a lower thrust bearing and a locking nut, the upper end of the mandrel is in threaded connection with the bottom end of the elastic pin nipple, the bearing outer sleeve is sleeved on the mandrel, the copper sleeve is arranged between the bearing outer sleeve and the mandrel, the upper thrust bearing and the lower thrust bearing are arranged at the upper end and the lower end of the copper sleeve respectively, the locking nut is arranged at the bottom end of the mandrel, and the lower thrust bearing is located above the locking nut.

the utility model has the advantages that: the utility model discloses following beneficial technological effect has:

1. the ball valve of the pressure maintaining ball valve overturning and sealing mechanism is informed to slide downwards and overturn for 90 degrees, the ball valve is in sealing contact with the upper ball valve seat, the pressure maintaining effect of the upper area of the ball valve is realized, at the moment, the core tube is positioned in the pressure maintaining area above the ball valve, so that the coring sample in the core tube is in a pressure maintaining state, the pressure maintaining sampling of the coring device is realized, and the coring success rate is improved;

in addition, the pressure maintaining ball valve overturning sealing mechanism for realizing 90-degree ball valve overturning is realized by the spring and the ball valve driving short joint, so that the structure of the pressure maintaining ball valve overturning sealing mechanism is greatly simplified, the use and the operation are simpler and more convenient, the reliability is greatly improved, and the subsequent maintenance is quicker and more convenient;

2. The core sample coring is carried out by matching the drill bit and the middle pipe drill bit, and the dual-drill coring mode is adopted, so that the utility model can adapt to the fourth-system sedimentary strata and bedrock, and has wider application range;

3. through the mutual matching of the elastic clamp mechanism and the elastic clamp hanging mechanism, the axial fixation of the core tube and the effect of keeping the core tube single-action before fishing and coring are realized, namely, rotary coring is realized, and the method is simple and rapid;

4. the fragile parts such as shearing pins are not used any more, the upper part and the lower part of the connecting mechanism are not fixedly connected by virtue of the connecting mechanism before the core extractor is thrown in and the core extractor is thrown in to the outer pipe assembly seat clamp, the connection is realized through mud hydraulic thrust in the core extraction process, when the core extractor is fished after core extraction, the upper part and the lower part of the connecting mechanism are fixedly connected, the control and the releasing clamp of the inner pipe assembly b spring clamp suspension mechanism are realized, the ball valve cannot be closed in advance before core extraction is completed, and further the safety, the reliability and the core extraction success rate of the core extractor are improved.

Drawings

fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an enlarged view of the area A in FIG. 1;

FIG. 3 is an enlarged view of the area at section B in FIG. 1;

FIG. 4 is an enlarged schematic view of the area C in FIG. 1;

FIG. 5 is an enlarged view of the area D in FIG. 1;

FIG. 6 is an enlarged schematic view of the area E in FIG. 1;

FIGS. 2 to 6 are schematic sectional views of the structure of FIG. 1, the lower end of FIG. 2 connecting the upper end of FIG. 3, the lower end of FIG. 3 connecting the upper end of FIG. 4, the lower end of FIG. 4 connecting the upper end of FIG. 5, the lower end of FIG. 5 connecting the upper end of FIG. 6;

FIG. 7 is an enlarged schematic view at A' of FIG. 3;

FIG. 8 is a schematic structural view of an outer tube assembly;

FIG. 9 is a schematic structural view of the inner tube assembly;

FIG. 10 is a schematic structural view of an inner tube assembly a;

FIG. 11 is a schematic structural view of an inner tube assembly b;

FIG. 12 is a view showing one of the states of the fishing and releasing after the coring operation is completed (the first elastic pin reaches the top end of the elongated pin hole of the lifting pipe);

FIG. 13 is a schematic view showing a state in which fishing and releasing are performed after coring is completed (the ejector pin hanging mechanism completes releasing operation);

FIG. 14 is an enlarged schematic view at A of FIG. 13;

FIG. 15 is one of the schematic views of the state during the ball valve inversion (the core barrel has been pulled out of the ball valve through hole);

FIG. 16 is an enlarged schematic view at B in FIG. 15;

FIG. 17 is an enlarged schematic view at C of FIG. 15;

FIG. 18 is an enlarged schematic view at D of FIG. 15;

FIG. 19 is an enlarged schematic view at E of FIG. 15;

FIG. 20 is a cross-sectional view of the line A-A1 in FIG. 2;

FIG. 21 is a cross-sectional view of FIG. 6 taken along line B-B1;

FIG. 22 is a partial schematic view of the slide bolt reaching an upward limit;

in the figure, 10-outer pipe assembly, 20-inner pipe assembly, 201-inner pipe assembly a, 202-inner pipe assembly b, 110-snapping chamber, 120-seat ring, 130-righting ring, 140-outer pipe drill bit, 141-torque transmission shoulder, 21-fishing spearhead, 22-snapping mechanism, 221-snapping a, 222-snapping bracket a, 223-releasing pipe, 224-snapping bracket pipe long pin hole, 225-water inlet, 226-snapping bracket pipe a, 227-snapping pipe inclined part, 23-lifting device, 231-lifting pipe long pin hole, 232-lifting pipe, 233-first elastic pin, 24-suspension ring, 25-dispensing pipe, 251-dispensing water outlet, 26-connecting mechanism, 261-joint, 2611-joint inner chamber, 262-piston, 2621-piston inner chamber shoulder, 2622-piston inner chamber guide hole, 2623-elastic bolt pulling hole, 263-bolt positioning cylinder, 2631-first bolt sliding hole, 264-bolt spring, 265-sliding bolt, 266-spring press ring, 267-support spring, 268-insertion connecting rod, 2681-connecting rod spring shoulder, 2682-second bolt sliding hole, 27-elastic clamp suspension mechanism, 271-elastic clamp bracket b, 272-release tube b, 273-elastic clamp cavity, 274-elastic piece opening, 275-elastic clamp cavity, 276-elastic clamp b, 277-release tube inclined part b, 28-base block, 29-elastic clamp bracket short section, 291-seat shoulder, 292-elastic pin slotted hole, 293-second elastic pin slotted hole, 30-middle pipe short section, 301-middle pipe short section shoulder, 31-single-action mechanism, 311-upper thrust bearing, 312-bearing outer sleeve, 313-copper sleeve, 314-lower thrust bearing, 315-mandrel, 316-lock nut, 32-conversion joint, 33-adjusting mechanism lock nut, 34-adjusting joint, 35-sealing short section, 351-sealing short section shoulder, 36-energy accumulator connecting pipe, 37-energy accumulator, 38-sealing mechanism, 381-quick-plug one-way valve pressure measuring joint, 382-pressure channel, 383-sealing joint sealing ring, 384-sealing joint shoulder, 385-sealing joint, 40-one-way ball valve cavity, 41-ball valve seat, 42-one-way ball valve, 43-temperature and pressure instrument connecting pipe, 44-temperature and pressure testing chamber, 46-core tube connecting short section, 47-core tube, 48-middle tube, 481-middle tube shoulder, 49-pressure maintaining ball valve turnover sealing mechanism, 4901-spring spacing ring, 4902-ball valve driving short section, 4903-spring, 4904-ball valve driving short section spring shoulder, 4905-ball valve tube shoulder, 4906-upper ball valve seat sealing ring, 4907-upper ball valve seat, 4908-ball valve tube, 4909-ball valve, 4910-ball valve shaft, 4911-ball valve turnover sliding groove, 4912-ball valve turnover driving bolt, 4913-ball valve tube long round hole, 4914-ball valve tube window, 4915-lower ball valve seat, 4916-lower ball valve seat sealing ring, 4917-bearing spring, 4918-ball valve lower gland, 50-piston tube, 501-piston tube water outlet, 51-flushing water inlet, 52-flushing water outlet, 53-torque transmission spline, 54-water outlet, 55-petal blocking spring and 56-middle tube drill bit.

Detailed Description

the invention will be further described with reference to the accompanying drawings and specific embodiments:

as shown in fig. 1 to 22, the safety type natural gas hydrate rotary pressure maintaining coring device comprises an outer tube assembly 10 and an inner tube assembly 20, wherein the inner tube assembly 20 is installed inside the outer tube assembly 10, an elastic clamping chamber 110, a seat ring 120 and a centering ring 130 are sequentially arranged on the inner wall of the outer tube assembly 10 from top to bottom, and a drill bit is arranged at the bottom end of the outer tube assembly 10;

the inner pipe assembly 20 comprises an inner pipe assembly a 201 and an inner pipe assembly b 202, the inner pipe assembly b 202 is installed inside the inner pipe assembly a 201 and can move axially along the inner pipe assembly a 201, and the inner pipe assembly a 201 comprises a fishing spearhead 21, an elastic clamping mechanism 22, a piston pipe 50, a middle pipe short section 30, a sealing short section 35, an energy accumulator connecting pipe 36, a middle pipe 48 and a pressure maintaining ball valve overturning sealing mechanism 49 which are sequentially connected from top to bottom; the inner pipe assembly b 202 comprises a lifting device 23, a connecting mechanism 26, an elastic clamp suspension mechanism 27, a single-action mechanism 31, a conversion joint 32, an adjusting joint 34, an energy accumulator connecting pipe 36, a sealing mechanism 38, a thermobaric instrument connecting pipe 43, a core pipe connecting short section 46 and a core pipe 47 which are sequentially connected from top to bottom;

The fishing spearhead 21, the snapping mechanism 22, the piston pipe 50, the middle pipe nipple 30, the sealing nipple 35, the energy accumulator connecting pipe 36, the middle pipe 48 and the ball valve pipe 4908 on the pressure maintaining ball valve overturning sealing mechanism 49 are all in threaded connection or integrated structure; the lifting device 23, the connecting mechanism 26 and the elastic clamp hanging mechanism 27, and the single-action mechanism 31, the adapter 32, the adjusting joint 34, the energy accumulator connecting pipe 36, the sealing mechanism 38, the temperature and pressure instrument connecting pipe 43, the core barrel connecting short section 46 and the core barrel 47 are all in threaded connection, integrated structure or other fixed connection modes, such as stable clamping, buckling, welding and the like;

The short section outer wall (not shown) of the middle pipe drill bit 56 is in contact with the inner wall of the centralizing ring 130, preferably in sealing contact and drilling fluid cannot pass through;

the snapping mechanism 22 comprises a snapping card a 221, a snapping card bracket a 222, a snapping card releasing pipe 223, a water inlet 225, a snapping card bracket pipe long pin hole 224, a snapping card bracket pipe a226 and a snapping card releasing pipe inclined part 227, wherein the snapping card a 221 is arranged in the snapping card chamber 110 and is connected with the snapping card bracket a 222, the snapping card bracket a 222 is connected and arranged in the snapping card releasing pipe 223, the snapping card releasing pipe 223 is fixedly connected with the fishing spearhead 21, the bottom end of the snapping card releasing pipe 223 is provided with the snapping card releasing pipe inclined part 227 for releasing the snapping card from the snapping card chamber 110, the side wall of the snapping card releasing pipe 223 is provided with the water inlet 225, and the snapping card bracket pipe long pin hole 224 is arranged in a middle cavity of the snapping card bracket pipe a 226;

the lifting device 23 comprises a lifting pipe 232, a lifting pipe long pin hole 231 and a first elastic pin 233, wherein the lifting pipe long pin hole 231 is arranged inside the lifting pipe 232;

the first elastic pin 233 arranged in the inner pipe assembly a 201 penetrates through the long pin hole 224 of the spring clip bracket pipe and the long pin hole 231 of the lifting pipe and then is fixedly arranged on the releasing pipe 223, and because the central axes 315 of the long pin hole 224 of the spring clip bracket pipe and the long pin hole 231 of the lifting pipe are on the same straight line, the first elastic pin 233 can freely slide in the long pin hole 224 of the spring clip bracket pipe and the long pin hole 231 of the lifting pipe at the same time, so that the sleeved connection among the lifting pipe 232, the spring clip bracket pipe a226 and the releasing pipe 223 is realized, and the connection between the lifting device 23 and the spring clip mechanism 22 is realized;

the upper part of the lifting pipe 232 is arranged inside the spring clip bracket pipe a226 and can move along the axial direction of the spring clip bracket pipe a226, and the lower part is arranged inside the piston pipe 50; the top end of the lifting tube 232 is positioned below the long pin hole 224 of the spring clip bracket tube;

The piston pipe 50 is provided with an obliquely arranged piston pipe water outlet 501, the upper end of the piston pipe 50 is connected with the lower end of the elastic clamping bracket pipe a226, the lower end of the piston pipe 50 is connected with the upper end of the middle pipe nipple 30, and the middle pipe nipple 30 is provided with a middle pipe nipple shoulder 301;

The connection part of the elastic clamping bracket pipe a226 and the piston pipe 50 is provided with a suspension ring 24, the suspension ring 24 is seated on the seat ring 120, the inner pipe assembly 20 is suspended and installed inside the outer pipe assembly 10 through the suspension ring 24, namely, the weight of the whole inner pipe assembly 20 is dropped on the outer pipe assembly 10;

the connection mechanism 26 disposed inside the piston tube 50 includes an upper portion and a lower portion, the upper portion including a joint 261, a joint inner chamber 2611, a piston 262, a piston inner chamber shoulder 2621, a piston inner chamber guide hole 2622, and an elastic latch pull hole 2623, the lower portion including a latch positioning cylinder 263, a first latch slide hole 2631, a latch spring 264, a slide latch 265, a spring pressing ring 266, a support spring 267, an insertion connecting rod 268, a connecting rod spring shoulder 2681, and a second latch slide hole 2682;

The upper end of the joint 261 of the connecting mechanism 26 is connected with the lower end of the long pipe 25, the joint 261 is positioned inside the long pipe 25, the upper end of the long pipe 25 is connected with the lower end of the lifting pipe 232, the lower part of the long pipe 25 is provided with a long pipe water outlet 251, and the long pipe water outlet 251 is positioned above the joint 261; the lower end of the joint 261 is connected with the piston 262, the joint 261 is provided with a joint inner chamber 2611, the bottom of the piston 262 is provided with a transversely arranged elastic bolt pulling hole 2623, the lower part of the elastic bolt pulling hole 2623 is provided with a piston inner chamber guide hole 2622 and a piston inner chamber shoulder 2621, the piston inner chamber guide hole 2622 is in a horn shape with a narrow upper part and a wide lower part, the left piston tube and the right piston tube are respectively arranged inside the piston tube 50 in an axial direction, the left piston inner chamber guide hole 2622 and the right piston inner chamber guide hole 2622 form an axial channel, the outer wall of the piston inner chamber guide hole 2622 is contacted with the inner wall of the piston tube 50, the piston inner chamber shoulder 2621 is positioned at the top of the piston inner chamber guide hole 2622, the bottom of the piston tube 50 is provided with a piston tube water outlet 501, the piston tube water outlet 501 is contacted with the outer wall of the piston inner chamber guide hole 2622, namely, the water outlet 501 of the piston tube is positioned below the elastic bolt pulling hole 2623, and the lower end of the piston inner chamber guide hole 2622 is connected with the spring pressing ring 266;

the inserting connecting rod 268 sequentially passes through an axial channel formed by the spring pressing ring 266 and the piston inner chamber guide hole 2622 and then extends into the connector inner chamber 2611 of the connector 261, a connecting rod spring shoulder 2681 is arranged at the lower end of the inserting connecting rod 268, a supporting spring 267 is sleeved at the lower part of the inserting connecting rod 268, and the supporting spring 267 is positioned between the spring pressing ring 266 and the connecting rod spring shoulder 2681, so that the expansion range of the supporting spring 267 is between the spring pressing ring 266 and the connecting rod spring shoulder 2681;

The upper portion of the inserting connecting rod 268 is provided with a second latch sliding hole 2682 which is transversely arranged, a latch positioning cylinder 263 and a sliding latch 265 which are transversely arranged are arranged in the second latch sliding hole 2682, a first latch sliding hole 2631 is arranged in the latch positioning cylinder 263, the sliding latch 265 comprises a body arranged in the second latch sliding hole 2682 and an extension part arranged outside the inserting connecting rod 268, that is, the extension portion extends from the inserting connection rod 268, the body of the sliding latch 265 is sleeved with the latch spring 264, the body of the sliding latch 265 extends into the first latch sliding hole 2631 and can move laterally along the first latch sliding hole 2631, and the diameter of the latch spring 264 is larger than that of the first latch sliding hole 2631, so that the latch spring 264 cannot extend into the first latch sliding hole 2631, and is restricted by the latch positioning cylinder 263, i.e., the entire latch spring 264 is located in the second latch sliding hole 2682;

The elastic card hanging mechanism 27 comprises an elastic card bracket b 271, a card disengaging pipe b 272, an elastic card cavity 273, an elastic card opening 274, an elastic card cavity 275, an elastic card b 276, an elastic card bracket short section 29 and a card disengaging pipe inclined section b 277;

the upper part of the elastic clip suspension mechanism 27 is arranged inside the piston pipe 50, and the lower part is arranged inside the middle pipe nipple 30;

the releasing tube b 272 is arranged inside the piston tube 50, the upper end of the releasing tube b 272 is connected with the lower end of the inserting connecting rod 268, the lower end of the releasing tube b 272 is provided with a releasing tube inclined part b 277 for releasing the elastic card b 276 from the elastic card chamber 275, the releasing tube inclined part b 277 is arranged inside the middle tube short section 30, an elastic sheet opening hole 274 is further arranged between the releasing tube inclined part b 277 and the releasing tube b 272, an elastic card bracket b 271 is transversely arranged inside the releasing tube b 272, an elastic card cavity 273 is arranged below the elastic card bracket b 271, two elastic cards b 276 are arranged below the elastic card cavity 273, the upper ends of the two elastic cards b 276 are fixed on the elastic card cavity 273 through a connecting piece (not shown), the two elastic cards b 276 are positioned inside the elastic card cavity 275, the elastic card cavity 275 is positioned inside the middle tube short section 30, and the lower end of the elastic cards b 276 is arranged on the base block 28 below, the base block 28 is arranged inside the middle pipe short section 30, and when the elastic clip b 276 is opened to a certain angle, the elastic clip b 276 is propped against a shoulder (not shown) of the middle pipe short section 30, so that the elastic clip b 276 cannot move axially upwards, namely, the elastic clip hanging mechanism 27 is propped against the shoulder of the middle pipe short section 30 and cannot move axially upwards;

in the present embodiment, all of the "upward" means an upward direction toward the fishing spear 21, and the "downward" means a downward direction downward from the fishing spear 21;

an elastic clamping bracket short joint 29 is arranged below the base block 28, and the upper part of the elastic clamping bracket short joint 29 is positioned inside an inclined part b 277 of the card disengaging pipe;

in this embodiment, the cartridge carrier sub 29 and the cartridge carrier b 271 are an integral structure;

an elastic pin slotted hole 292 is axially arranged in the elastic clamp bracket short section 29, a second elastic pin 293 is arranged in the elastic pin slotted hole 292, the second elastic pin 293 penetrates through the elastic pin slotted hole 292 and the elastic clamp bracket short section 29 and then is fixedly arranged on an inclined part b 277 of the releasing pipe, and the second elastic pin 293 can freely slide in the elastic pin slotted hole 292;

The trip tube angled portion b 277 is seated on a seating shoulder 291 of the latch bracket sub 29 so that the trip tube angled portion b 277 is relatively axially movable upwardly relative to the latch bracket sub 29;

the lower part of the elastic clip bracket short section 29 is positioned inside the middle pipe short section 30 and is seated on a shoulder 301 of the middle pipe short section 30, so that the elastic clip bracket short section 29 is supported by the middle pipe short section 30 and cannot move axially downwards, and the elastic clip hanging mechanism 27 cannot move axially downwards;

The interior of the middle pipe short section 30 is also provided with a single-action mechanism 31, and the single-action mechanism 31 is positioned below the elastic clamp bracket short section 29;

the single-action mechanism 31 comprises an upper thrust bearing 311, a mandrel 315, a copper bush 313, a bearing outer bush 312, a lower thrust bearing 314 and a locking nut 316, the upper end of the mandrel 315 is in threaded connection with the bottom end of the elastic clamp bracket short section 29, the bearing outer bush 312 is sleeved on the mandrel 315, the copper bush 313 is arranged between the bearing outer bush 312 and the mandrel 315, the upper thrust bearing 311 and the lower thrust bearing 314 are respectively arranged at the upper end and the lower end of the copper bush 313, the locking nut 316 is arranged at the bottom end of the mandrel 315, and the lower thrust bearing 314 is positioned above the locking nut 316;

the single-action mechanism 31 is connected with the adapter 32 through the bearing outer sleeve 312, the adapter 32 is connected with the upper end of the adjusting joint 34, the adjusting joint 34 is sleeved with an adjusting mechanism locking nut 33, the adjusting mechanism locking nut 33 is arranged at the lower end of the adapter 32, the adjusting joint 34 is positioned inside the energy accumulator connecting pipe 36, the lower end of the adjusting joint 34 is connected with the upper end of the energy accumulator connecting pipe 36, and the lower end of the energy accumulator connecting pipe 36 is connected with the sealing mechanism 38;

the single-action mechanism 31 prevents the core tube 47 from rotating along with the outer tube assembly 10 to cause core abrasion;

the sealing mechanism 38 includes a quick-insert one-way valve pressure tap 381, a pressure channel 382, a seal tap sealing ring 383, a seal tap 385 and a seal tap shoulder 384,

The upper end of the sealing joint 385 is connected with the lower end of the energy accumulator connecting pipe 36, an axial pressure channel 382 is arranged in the middle of the sealing joint 385, a quick-insertion one-way valve pressure measuring joint 381 extends into the pressure channel 382, a sealing joint sealing ring 383 is sleeved on the sealing joint 385, sealing joint shoulders 384 are arranged on two sides of the sealing joint 385, and the lower end of the sealing joint 385 is connected with the upper end of the temperature and pressure instrument connecting pipe 43, preferably in threaded connection;

the sealing mechanism 38 is located inside the energy accumulator connecting pipe 36 and can move axially along the energy accumulator connecting pipe 36, when the sealing mechanism 38 reaches an upward limit position, the sealing joint shoulder 384 contacts the sealing short section 35, so that the sealing mechanism 38 stops moving upward, and when the sealing mechanism 38 reaches a downward limit position, the adjusting joint 34 contacts the energy accumulator connecting pipe 36, so that the sealing mechanism 38 stops moving downward;

a one-way ball valve 42 is connected below the sealing mechanism 38, the one-way ball valve 42 is arranged in a one-way ball valve cavity 40, the one-way ball valve cavity 40 is arranged in the sealing joint 385, and the one-way ball valve 42 is arranged so that air flow can only flow into the pressure channel 382 of the sealing mechanism 38 from bottom to top through the one-way ball valve 42;

the lower end of the one-way ball valve 42 is arranged on the ball valve seat 41, an axial channel is arranged on the ball valve seat 41, the ball valve seat 41 is fixedly connected with the sealing joint 385, and the ball valve seat 41 is positioned in the connecting pipe 43 of the temperature and pressure instrument;

the lower end of the thermomanometer connecting pipe 43 is connected with the upper end of a core pipe connecting nipple 46, the lower end of the core pipe connecting nipple 46 is fixedly connected with the upper end of a core pipe 47, preferably in threaded connection, the lower end of the core pipe 47 is connected with a petal blocking spring 55 for obtaining and fixing a core sample, and the core pipe 47 is positioned inside a middle pipe 48;

the pressure maintaining ball valve turnover sealing mechanism 49 comprises a spring limiting ring 4901, a ball valve driving nipple 4902, a spring 4903, a ball valve driving nipple spring shoulder 4904, a ball valve pipe shoulder 4905, an upper ball valve seat sealing ring 4906, an upper ball valve seat 4907, a ball valve pipe 4908, a ball valve 4909, a ball valve turnover driving bolt 4912, a ball valve shaft 4910, a ball valve turnover sliding groove 4911, a ball valve pipe long round hole 4913, a ball valve pipe window 4914, a lower ball valve seat 4915, a lower ball valve seat sealing ring 4916, a bearing spring 4917 and a ball valve lower pressing cover 4918; a ball valve 4909 is provided with a ball valve shaft 4910 and a ball valve turnover sliding groove 4911, and the ball valve 4909 is provided with a through hole for the core barrel 47 to pass through;

a ball valve pipe 4908 on the inner pipe assembly a 201 is sequentially provided with a ball valve pipe 4908 sealing ring (not shown in the figure), a ball valve overturning driving bolt 4912 and a ball valve pipe long round hole 4913 from top to bottom;

the upper end of a ball valve pipe 4908 is connected with the lower end of the middle pipe 48, preferably, the upper end of the ball valve pipe 4908 is connected with the lower end of the middle pipe 48 through threaded connection, a sealing ring of the ball valve pipe 4908 is arranged at the joint of the ball valve pipe 4908 and the middle pipe 48, a ball valve pipe window 4914 is arranged in the hollow interior of the ball valve pipe 4908, a ball valve pipe long round hole 4913 is formed in the middle of the ball valve pipe 4908, a ball valve overturning driving bolt 4912 located in the ball valve pipe long round hole 4913 is fixed on the inner wall of the ball valve pipe 4908, and the ball valve overturning driving bolt 4912 extends into a ball valve overturning sliding groove 4911;

the ball valve 4909 is fixedly arranged in a ball valve pipe window 4914 on the ball valve pipe 4908 through a ball valve shaft 4910, one end of the ball valve shaft 4910 is connected with the ball valve 4909, and the other end of the ball valve shaft 4910 extends into a ball valve pipe long round hole 4913 and can freely slide in the ball valve pipe long round hole 4913 along the axial direction;

an upper ball valve seat 4907 and a lower ball valve seat 4915 are arranged in the ball valve tube 4908, an upper ball valve seat sealing ring 4906 is arranged at the joint of the ball valve tube 4908 and the upper ball valve seat 4907, a lower ball valve seat sealing ring 4916 is arranged at the joint of the ball valve tube 4908 and the lower ball valve seat 4915, by disposing the upper ball seat seal 4906 in the gap between the upper ball seat 4907 and the inner wall of the ball valve tube 4908, so that the upper ball valve seat 4907 and the ball valve tube 4908 are in sealing contact, and in the same way, by positioning lower ball seat seal 4916 in the gap between lower ball seat 4915 and the inner wall of ball valve tube 4908, so that the lower ball valve seat 4915 and the ball valve tube 4908 form a sealing contact, the upper end of the ball valve tube 4908 is provided with a ball valve tube shoulder 4905, the middle part of the ball valve tube 4908 contacts the middle tube 48 through concave-convex matching and props against the middle tube 48, and the lower part of the ball valve tube 4908 is connected with the middle tube 48, preferably in threaded connection, so that the middle tube 48 and the ball valve tube 4908 are more firmly connected;

The upper end of an upper ball valve seat 4907 is connected with the lower end of a ball valve driving nipple 4902, the lower end is contacted with the upper end of a ball valve 4909, the ball valve driving nipple 4902 is positioned below a core tube connecting nipple 46, the ball valve driving nipple 4902 is positioned between a core tube 47 and a middle tube 48, a spring 4903 is further arranged between the ball valve driving nipple 4902 and the middle tube 48, the spring 4903 is sleeved on the ball valve driving nipple 4902, the upper end of the spring 4903 is contacted with a spring spacing ring 4901 and is pressed by the spring spacing ring 4901, namely, the opened upper limit position of the spring 4903 is limited by the spring spacing ring 4901, the spring spacing ring 4901 is limited by the middle tube shoulder 481 through concave-convex matching, the spring spacing ring 4901 is compressed, the spring spacing ring 4901 is positioned between the core tube 47 and the middle tube 48, the lower end of the spring spacing ring 4901 is contacted with the ball valve driving spring shoulder 4904 and is pressed by the ball valve driving spring shoulder 4904, the ball valve driving nipple spring shoulder 4904 is in contact with the spring limiting ring 4901 and abuts against the spring limiting ring 4901, the ball valve driving nipple spring shoulder 4904 can be an outer side protruding block of the ball valve driving nipple 4902 or a stop block fixedly connected with the ball valve driving nipple 4902, and the ball valve driving nipple spring shoulder 4904 is positioned above a ball valve pipe shoulder 4905;

the spring 4903 is placed in a compressed state by placing the spring 4903 between the spring retaining ring 4901 and the ball valve drive nipple spring shoulder 4904, the ball valve tube shoulder 4905 is located between the ball valve drive nipple 4902 and the middle tube 48, and above the upper ball valve seat 4907;

the lower ball valve seat 4915 is provided with a bearing spring 4917 and a ball valve lower gland 4918 from top to bottom, the upper end and the lower end of the bearing spring 4917 are respectively connected with the lower ball valve seat 4915 and the ball valve lower gland 4918, and the upper end of the lower ball valve seat 4915 is contacted with the lower end of the ball valve 4909;

a bearing spring 4917 for floating contact between the ball valve 4909 and the lower ball valve seat 4915;

the upper end of the ball valve pipe 4908 is connected with the lower end of the middle pipe 48, so that the pressure maintaining ball valve turnover sealing mechanism 49 is connected with the middle pipe 48, and the spring 4903 in a compressed state pushes the ball valve 4909 of the pressure maintaining ball valve turnover sealing mechanism 49 to slide downwards and turn over 90 degrees through the ball valve driving nipple 4902.

when the core barrel assembly is used specifically, as shown in the figure, before coring and fishing, that is, when the core barrel assembly is used for coring installation, the core barrel 47 passes through the through hole of the ball valve 4909 downwards, the core barrel 47 is tightly attached to the ball valve 4909, after the core barrel 47 is installed, the elastic clamping mechanism 22 is limited in the elastic clamping chamber 110 and cannot pass over the elastic clamping chamber 110 upwards, and the elastic clamping suspension mechanism 27 is limited in the middle pipe nipple 30 and cannot pass over the middle pipe nipple 30, so that the inner pipe assembly b 202 cannot move axially at the moment, and the core barrel 47 cannot move axially, that is, the axial fixation is kept; the ball valve 4909 is subjected to the thrust transmitted by the spring 4903 through the ball valve driving nipple 4902 in a compressed state, because the ball valve 4909 is tightly attached by the core barrel 47 at the moment, which is equivalent to that the core barrel 47 gives the ball valve 4909 a transverse resistance, the ball valve 4909 cannot turn downwards due to the thrust given by the spring 4903, namely the core barrel 47 limits the ball valve 4909 to turn downwards, meanwhile, the ball valve 4909 is contacted by the core barrel 47 to enable the ball valve 4909 to prop up against the upper ball valve seat 4907, the upper ball valve seat 4907 props up the ball valve driving nipple 4902 upwards, a ball valve driving nipple spring shoulder 4904 on the ball valve driving nipple 4902 also moves upwards correspondingly, and the spring limiting ring 4901 is limited by the middle pipe shoulder 481 on the middle pipe 48, so that the spring 4903 is compressed and the elastic potential energy is increased; when coring is completed and fishing is performed, as shown in the figures, after the core barrel 47 is pulled upwards out of the through hole of the ball valve 4909, the transverse resistance of the core barrel 47 to the ball valve 4909 disappears, that is, the core barrel 47 does not limit the ball valve 4909 to turn downwards, because the elastic potential energy of the spring 4903 is enough, the ball valve 4909 moves downwards along the long circular hole 4913 of the ball valve pipe under the thrust of the spring 4903, when the ball valve shaft 4910 connected with the ball valve 4909 contacts the ball valve turnover driving plug 4912, the thrust generated by the spring 4903 pushes the ball valve turnover driving plug 4912, and because the ball valve turnover driving plug 4912 is abutted by the ball valve turnover sliding groove 4911 on the ball valve 4909, the ball valve turnover driving plug 4912 gives a torque to the ball valve 4909 to slide downwards and turn over 90 degrees, during the process of the ball valve 4909 downwards pushing the ball valve 4909 downwards to push the lower ball valve seat 4915, the lower ball valve seat 4915 compresses the load-bearing spring 4917 to move downwards until the lower valve seat 4915 contacts the lower valve seat 4918, that is, when the ball valve 4909 reaches the downward limit position, the lower ball valve seat 4915 contacts the lower ball valve gland 4918;

through the above operations, the pressure maintaining ball valve turnover sealing mechanism 49 and the core barrel 47 are mutually matched to realize downward sliding and 90-degree turnover of the ball valve 4909;

The ball valve 4909 is in sealing contact with the upper ball valve seat 4907 to realize the pressure maintaining effect of the upper area of the ball valve 4909, and the core barrel 47 is located in the pressure maintaining area above the ball valve 4909 at the moment, so that a core sample in the core barrel 47 is in a pressure maintaining state to realize the pressure maintaining sampling of the coring device.

Further, an energy storage chamber is arranged between the lower portion of the adjusting joint 34 and the upper portion of the sealing mechanism 38, the energy storage chamber is located inside the energy storage connecting pipe 36, an energy storage device 37 is arranged in the energy storage chamber, the energy storage device 37 is connected with the quick-insertion one-way valve pressure measuring joint 381, and the energy storage device 37 is used for maintaining pressure to be stable.

further, a warm-pressing test chamber 44 is arranged between the lower portion of the ball valve seat 41 and the upper portion of the core barrel connection short section 46, the warm-pressing test chamber 44 is located inside the warm-pressing instrument connection pipe 43, and equipment for measuring warm-pressing parameters is installed in the warm-pressing test chamber 44.

furthermore, the lower end of the pressure maintaining ball valve overturning sealing mechanism 49 is connected with a flushing mechanism (not shown in the figure) for flushing the core barrel 47, the flushing mechanism is installed on the inner pipe assembly a 201, and the flushing mechanism prevents pollutants such as rock debris on the core barrel 47 from being brought into the core sampler, particularly into a pressure maintaining area, so that the pressure maintaining effect is influenced, and even the pressure maintaining cannot be realized;

the flushing mechanism comprises a flushing water inlet 51 and a flushing water outlet 52, after high-pressure drilling fluid enters from the flushing water inlet 51, high-pressure quick flushing is carried out on rock debris on the core barrel 47, the drilling fluid is then discharged from the flushing water outlet 52, and the flushing mechanism is in threaded connection with the lower end of the ball valve pipe 4908 and is connected with the lower end of the ball valve lower pressure cover 4918.

In this embodiment, the flushing mechanism is provided with two water outlet flow channels, which are a first water outlet flow channel formed by the gap between the outer pipe drill bit 140 and the middle pipe drill bit 56 and a second water outlet flow channel formed by the gap between the core barrel 47 and the middle pipe drill bit 56, respectively, the drilling fluid enters the inner pipe assembly b 202 from the water inlet 225, then flows out from the pipe distribution water outlet 251, enters the space between the inner pipe assembly a 201 and the inner pipe assembly b 202, then flows out from the piston pipe water outlet 501, and enters the space between the outer pipe assembly 10 and the inner pipe assembly 20, because the centralizing ring 130 is in sealing contact with the flushing mechanism, the drilling fluid between the outer pipe assembly 10 and the inner pipe assembly 20 enters the flushing mechanism through the flushing water inlet 51, and the drilling fluid entering the flushing mechanism from the flushing water inlet 51 is discharged from the first water outlet flow channel, that is, from the gap between the outer pipe drill bit 140 and the middle, and the other path is discharged from a second water outlet flow channel, namely, discharged from a gap between the core tube 47 and the middle pipe drill bit 56, so that the drilling fluid can flush the core tube 47 through a flushing mechanism.

in this embodiment, the middle pipe drill bit 56 is connected to the flushing mechanism and located below the flushing mechanism, the middle pipe drill bit 56 may be a five-wing carbide drag bit or a PDC drill bit or a drill bit made of other materials, the middle pipe drill bit 56 is connected to the flushing mechanism, the flushing mechanism is connected to the ball valve pipe 4908, and the ball valve pipe 4908 is connected to the middle pipe 48, so that the middle pipe drill bit 56 is connected to the middle pipe 48, the middle pipe drill bit 56 is connected to the inner pipe assembly 20, and the inner pipe assembly 20 can drive the middle pipe drill bit 56 to rotate.

in this embodiment, the outer tube drill 140 is provided with a torque transmission shoulder 141 protruding inward, and the torque transmission shoulder 141 is engaged with the torque transmission spline 53 protruding outward on the middle tube drill 56, so that the outer tube drill 140 transmits torque to the middle tube drill 56 and drives the middle tube drill 56 to rotate together in a mutually matched manner, so that the outer tube drill 140 and the middle tube drill 56 are matched together to perform core sample coring; a certain gap is formed between the petal blocking spring 55 and the middle pipe drill bit 56, and the inner diameter of the petal blocking spring 55 is larger than that of the middle pipe drill bit 56, so that the middle pipe drill bit 56 rotates to feed in the rotary coring process, the petal blocking spring 55 does not rotate and keeps single movement, and a core sample rotationally trimmed by the middle pipe drill bit 56 can enter the petal blocking spring 55 and the core pipe 47.

In particular use, when the inner tube assembly 20 is successfully installed inside the outer tube assembly 10, then: the card ejection a 221 on the card ejection mechanism 22 is in an open state and is limited in the card ejection chamber 110, so that the card ejection mechanism 22 is limited by the card ejection chamber 110 and cannot move axially upwards;

the elastic clip hanging mechanism 27 is in an open state through the elastic clip b 276 on the elastic clip hanging mechanism 27 and is limited by the middle pipe short section 30, namely, the open elastic clip b 276 is in contact with a shoulder of the middle pipe short section 30 and is limited, so that the elastic clip hanging mechanism 27 is limited and the elastic clip hanging mechanism 27 cannot move axially upwards; the entire inner tube assembly 20 is restrained from downward axial movement by the suspension ring 24, the inner tube assembly 20 reaches the downward limit, and the latch mechanism 22 and the latch suspension mechanism 27 restrain the inner tube assembly 20 such that the inner tube assembly 20 cannot move upward axially.

before fishing and coring are carried out, the upper part and the lower part of the connecting mechanism 26 are in contact connection, and after the inner pipe assembly 20 is successfully installed inside the outer pipe assembly 10, a fishing and coring process is started: firstly, injecting slurry into the inner pipe assembly 20 through a slurry pump, wherein the slurry enters the inner pipe assembly 20 from the water inlet 225, and then flows out of the pipe distribution outlet 251 and then impacts the piston 262 below downwards, the hydraulic pressure generated by the slurry pushes the piston 262 downwards, the piston 262 compresses the supporting spring 267 downwards through the spring pressing ring 266, so that the insertion connecting rod 268 shaft moves upwards relatively relative to the piston inner chamber guide hole 2622, so that the sliding pin 265 slides upwards axially along the piston inner chamber guide hole 2622, the piston inner chamber guide hole 2622 retracts towards the inner part of the second pin sliding hole 2682 against the sliding pin 265, and the body of the sliding pin 265 slides towards the first pin sliding hole 2631, so that the pin spring 264 is compressed; when the sliding pin 265 moves upward axially above the shoulder 2621 of the inner chamber of the piston, the elastic pin-pulling hole 2623 moves downward continuously, the elastic pin-pulling hole 2623 is located below the water outlet 501 of the piston tube, so that the piston tube water outlet 501 is communicated with the chamber between the piston tube 50 and the tube 25, so that the water outlet 501 of the piston pipe is communicated with the water outlet 251 of the matched pipe to form a slurry circulation channel, so that the slurry inside the inner pipe assembly 20 flows out of the piston pipe water outlet 501 through the pipe extension water outlet 251 into the area between the outer pipe assembly 10 and the inner pipe assembly 20, the hydraulic pressure generated by the slurry in the inner tube assembly 20 is decreased, the piston 262 stops moving axially downward, and when the elastic plug pin pulling hole 2623 reaches the upward limit position, the extension part of the sliding plug pin 265 is inserted into the elastic plug pin pulling hole 2623, thereby causing the upper and lower portions of the connection mechanism 26 to change from the contact state to the fixed connection state;

when the upper part and the lower part of the connecting mechanism 26 become fixed connection, the fishing spearhead 21 drives the disengaging tube 223 and the first elastic pin 233 on the disengaging tube 223 to move axially upwards along the long pin hole 231 of the lifting tube and the long pin hole 224 of the snapping bracket tube, and the first elastic pin 233 is enabled to move upwards to contact the top of the long pin hole 231 of the lifting tube, then, under the driving of the disengaging tube 223, the first elastic pin 233 continues to move axially upwards along the long pin hole 224 of the snapping bracket tube and drives the lifting tube 232 to move axially upwards, so that the fishing spearhead 21 drives the lifting device 23 to move axially upwards through the snapping mechanism 22;

Before the first elastic pin 233 contacts the upper end of the long pin hole 224 of the elastic clamping bracket tube, the first elastic pin 233 drives the releasing tube b 272 to move upwards through the lifting tube 232 of the lifting device 23 and the inserting connecting rod 268 of the connecting mechanism 26, the releasing tube b 272 drives the releasing tube inclined part b 277 to move upwards and axially, the releasing tube inclined part b 277 drives the second elastic pin 293 connected with the releasing tube inclined part b 277 to move upwards and axially along the elastic pin long round hole 292 until the second elastic pin 293 contacts the top end of the elastic pin long round hole 292, the releasing tube inclined part b 277 also contacts the elastic clamping b 276 while the second elastic pin 293 contacts the top end of the elastic pin long round hole 292, and the contact elastic clamping b 276 is disconnected from the short joint 30 under the continuous upward and axial movement of the releasing tube b 272, so as to complete the releasing action, that is, the fishing spearhead 21 drives the pipe b 272 to move upwards, the pipe b 272 drives the pipe b 277 to move axially upwards, the pipe b 277 contacts the elastic clamp b 276, so that the elastic clamp b 276 contracts inwards and is not in an open state, the elastic clamp b 276 is disconnected from the shoulder of the middle pipe nipple 30, the elastic clamp b 276 can move away from the middle pipe nipple, the fishing spearhead drives the elastic clamp suspension mechanism to move away from the middle pipe nipple, and final releasing is finished;

in the process that the releasing pipe b 272 drives the releasing pipe inclined part b 277 to move upwards and axially to contact the elastic card b 276, namely, the releasing pipe inclined part b 277 moves towards the direction close to the elastic card b 276;

then, the whole elastic clip hanging mechanism 27 can axially move upwards, and the elastic clip hanging mechanism 27 sequentially drives the single acting mechanism 31, the sealing mechanism 38, the core tube 47 and the petal blocking spring 55 to axially move upwards through the second elastic pin 293;

the fishing spearhead 21 continues to drive the elastic clip hanging mechanism 27, the single-action mechanism 31, the sealing mechanism 38, the core tube 47 and the petal arresting spring 55 to axially move upwards through the clip-removing pipe 223, and the core tube 47 and the petal arresting spring 55 continue to axially move upwards until the sealing joint shoulder 384 of the sealing mechanism 38 contacts the sealing nipple shoulder 351 of the sealing nipple 35 to stop moving upwards, namely when the core tube 47 reaches an upward limit position, the sealing joint shoulder 384 contacts the sealing nipple shoulder 351 as shown in the figure;

before the inclined part 227 of the releasing pipe contacts the elastic clamp a 221, the core pipe 47 and the petal-shaped check spring 55 are pulled upwards from the through hole of the ball valve 4909, so that the transverse resistance of the core pipe 47 to the ball valve 4909 is eliminated, namely, the core pipe 47 does not block the ball valve 4909 from turning downwards, at the moment, the ball valve 4909 moves downwards along the long round hole 4913 of the ball valve pipe integrally under the thrust of the spring 4903, in the process of downwards moving the ball valve 4909, the driving pin sliding groove 4911 of the ball valve is enabled to turn around the ball valve 4909 fixed on the ball valve pipe 4908 to perform combined sliding and rotating motion, and meanwhile, the ball valve 4909 is given a turning torque and drives the ball valve 4909 to turn by 90 degrees;

After the ball valve 4909 slides downwards and turns over 90 °, the fishing spearhead 21 drives the inclined part b 277 of the card release pipe to move towards the direction of the card release sheet b 276, so that the inclined part 227 of the card release pipe contacts the card release a 221, the card release a 221 is disconnected from the card release chamber 110, and the card release action is completed; after the releasing action is completed, the fishing spearhead 21 drives the releasing tube 223 to continue to move axially upwards, so that the whole inner tube assembly 20 can be pulled out from the outer tube assembly 10, that is, after the releasing action of the inner tube assembly b 202 is completed, the inner tube assembly b 202 can be driven by the fishing spearhead 21 to move axially upwards, and then the core sample of the inner tube assembly 20 is taken out, and the whole process of coring is completed.

the region from the part above the ball valve 4909, which is in contact with the upper ball valve seat 4907, to the part below the sealing joint shoulder 384, which is in contact with the sealing nipple 35, is a stable pressure maintaining region, and the core pipe 47 containing the core sample is located in the pressure maintaining region, so that the core is in a pressure maintaining state under high pressure, and pressure maintaining and coring are realized.

In the process of hoisting and throwing the inner pipe assembly 20 to the bottom of the hole before the inner pipe assembly 26 is thrown into the bottom of the hole, the upper part and the lower part of the connecting mechanism 26 are separated, and only in the process of coring, when drilling mud circularly pushes the piston to move downwards, the extending part of the sliding bolt 265 can extend into the elastic bolt pulling hole 2623, so that the upper part and the lower part of the connecting mechanism 26 are fixedly connected. Therefore, in the process of hoisting before putting to the bottom of the hole and putting in the bottom of the hole, the fishing spearhead 21 does not pull the release pipe b of the inner pipe assembly b 202 due to the disconnection of the connecting mechanism 26, so that the inner pipe assembly b 202 does not release from the inner pipe assembly a 201, the core pipe 47 does not move upwards, the core pipe 47 is not pulled upwards from the through hole 4909 of the ball valve 4909, the ball valve 4909 is ensured not to be turned downwards before coring, and the accident that the ball valve 4909 is closed in advance before coring is not completed is avoided.

Various other changes and modifications may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such changes and modifications should fall within the scope of the present invention.

Claims

1. The utility model provides a safe type natural gas hydrate rotation pressurize corer which characterized in that: the drilling tool comprises an outer pipe assembly and an inner pipe assembly arranged in the outer pipe assembly, wherein a drill bit is arranged at the bottom end of the outer pipe assembly;

The core tube is positioned inside the middle tube;

2. the safety type rotary pressure maintaining coring device for natural gas hydrates according to claim 1, wherein: when the core tube passes through the through hole of the ball valve downwards, the edge of the ball valve is tightly attached to the core tube, the core tube limits the ball valve to turn downwards, meanwhile, the ball valve is contacted by the core tube, so that the ball valve upwards pushes against the upper ball valve seat, and the spring limiting ring is limited by the shoulder of the middle tube on the lower middle tube; when the core tube is pulled upwards from the through hole of the ball valve, the ball valve is separated from the core tube and overturned by 90 degrees, and when the ball valve reaches a descending limit position, the bearing spring is compressed to a lower ball valve seat to be contacted with a lower pressing cover of the ball valve.

3. the safety type rotary pressure maintaining coring device for natural gas hydrates according to claim 1, wherein: the lower extreme of pressurize ball valve upset sealing mechanism is connected and is equipped with the mechanism of washing that washes the core barrel, washes the mechanism and is equipped with out the water runner, goes out the water runner and is outer tube drill bit and well pipe drill bit clearance and core barrel and well pipe drill bit clearance.

4. The safety type rotary pressure maintaining coring device for natural gas hydrates according to claim 1, wherein: sealing mechanism is including inserting check valve pressure measurement joint, pressure channel, sealing joint sealing washer, sealing joint and sealing joint circular bead soon, and sealing joint's upper end is connected with the lower extreme of energy storage ware connecting pipe, and the sealing joint middle part is equipped with axial pressure channel, inserts check valve pressure measurement joint soon and stretches into to the pressure channel in, and the last cover of sealing joint is equipped with the sealing joint sealing washer, and the sealing joint both sides are equipped with the sealing joint circular bead, and the lower extreme of sealing joint is connected with the upper end of warm pressure appearance connecting pipe.

5. The safety type rotary pressure maintaining coring device for natural gas hydrates according to claim 1, wherein: an upper ball valve seat sealing ring is arranged at the joint of the ball valve pipe and the upper ball valve seat, and a lower ball valve seat sealing ring is arranged at the joint of the ball valve pipe and the lower ball valve seat; the lower ball valve seat is provided with a bearing spring and a ball valve lower gland from top to bottom, the upper end and the lower end of the bearing spring are respectively connected with the lower ball valve seat and the ball valve lower gland, and the upper end of the lower ball valve seat is contacted with the lower end of the ball valve.

6. the safety type rotary pressure maintaining coring device for natural gas hydrates according to claim 1 or 5, wherein: the ball valve is in floating contact with the lower ball valve seat.

7. the safety type rotary pressure maintaining coring device for natural gas hydrates according to claim 1, wherein: the bullet card mechanism includes bullet card a, bullet card bracket an, the card pipe that takes off, the water inlet, bullet card bracket pipe long pinhole, bullet card bracket pipe an, take off the card pipe rake, bullet card a sets up in the bullet card is indoor, and be connected with bullet card bracket an, bullet card room sets up the inner wall at the outer tube assembly, bullet card bracket an is connected and is set up inside taking off the card pipe, take off card pipe and salvage first fixed connection, the bottom that takes off the card pipe is equipped with and is used for taking off the card pipe rake that takes off the card from bullet card room and come out, be equipped with the water inlet on the lateral wall that takes off the card pipe, bullet card bracket pipe long pinhole sets up inside the lumen of bullet card bracket pipe an.

8. the safety type rotary pressure maintaining coring device for natural gas hydrates according to claim 1, wherein: the lifting device comprises a lifting pipe, a lifting pipe long pin hole and a first elastic pin, wherein the lifting pipe long pin hole is formed in the lifting pipe; the first elastic pin penetrates through the long pin hole of the elastic clamping bracket pipe and the long pin hole of the lifting pipe and then is fixedly arranged on the releasing clamping pipe, the central axes of the long pin hole of the elastic clamping bracket pipe and the long pin hole of the lifting pipe are on the same straight line, and the lifting pipe, the elastic clamping bracket pipe a and the releasing clamping pipe are connected in a sleeved mode.

9. the safety type rotary pressure maintaining coring device for natural gas hydrates according to claim 1, wherein: the elastic clip hanging mechanism comprises an elastic clip bracket b, a releasing tube b, an elastic clip cavity, an elastic clip opening, an elastic clip cavity, an elastic clip b, an elastic clip bracket short section and a releasing tube inclined section b; the upper part of the elastic clip hanging mechanism is arranged in the piston tube, and the fishing spearhead is used for driving the inclined part b of the card releasing tube to move towards the direction close to the elastic clip piece b, so that the elastic clip piece b is disconnected from the middle tube short section.

10. the safety type rotary pressure maintaining coring device for natural gas hydrates according to claim 1, wherein: the single-action mechanism comprises an upper thrust bearing, a mandrel, a copper sleeve, a bearing outer sleeve, a lower thrust bearing and a locking nut, the upper end of the mandrel is in threaded connection with the bottom end of the elastic pin nipple, the bearing outer sleeve is sleeved on the mandrel, the copper sleeve is arranged between the bearing outer sleeve and the mandrel, the upper end and the lower end of the copper sleeve are respectively provided with the upper thrust bearing and the lower thrust bearing, the locking nut is arranged at the bottom end of the mandrel, and the lower thrust bearing is located above the locking nut.