CN109854195B

CN109854195B - Rotary pressure-maintaining coring method for offshore drilling

Info

Publication number: CN109854195B
Application number: CN201811508672.8A
Authority: CN
Inventors: 秦绪文; 卢秋平; 梁金强; 寇贝贝; 陆红锋; 黄芳飞; 康冬菊; 王偲; 曲佳; 史浩贤
Original assignee: Guangzhou Marine Geological Survey
Current assignee: Guangzhou Marine Geological Survey
Priority date: 2018-12-11
Filing date: 2018-12-11
Publication date: 2021-03-16
Anticipated expiration: 2038-12-11
Also published as: CN109854195A

Abstract

The invention relates to a rotary pressure maintaining and coring method for ocean drilling, which comprises the following steps: 1) throwing the inner pipe assembly into an outer pipe assembly positioned at the bottom of the hole through the fishing spearhead; 2) conveying the inner pipe assembly to the outer pipe assembly by a rope, clamping, synchronously drilling down to a bottom stratum together, and performing rotary core sample coring by matching an outer pipe drill bit and a middle pipe drill bit together; 3) after the fishing spearhead drives a shear pin of the inner pipe assembly b to shear and disengage from the inner pipe assembly, the shear pin slides upwards along the inner pipe assembly a, a core pipe with a core sample slides upwards and enters the inner pipe assembly a, and the spring drives the short section through the ball valve to push the ball valve and drives the ball valve to slide downwards to realize 90-degree overturning; 4) the inner pipe assembly is released from the appearance assembly through the fishing spearhead and is pulled out of a wellhead, and a core sample is taken out to complete the pressure maintaining and coring process. The rotary pressure-maintaining sampling device can realize rotary pressure-maintaining sampling, can adapt to the sedimentary strata and bedrock of the fourth system, and has wider application range.

Description

Rotary pressure-maintaining coring method for offshore drilling

Technical Field

The invention relates to the technical field of drilling, in particular to a rotary type pressure maintaining and coring method for natural gas hydration in ocean drilling.

Background

The method is characterized in that a natural gas hydrate sample is obtained by ocean drilling, and the natural gas hydrate is located in polar regions and deep sea ocean environments which are poor in conditions and difficult to access, and is rapidly decomposed into two components of the natural gas hydrate, namely liquid water and methane gas when the natural gas hydrate is brought to the ground surface. However, the marine environment changes frequently, the more times of coring failure are, the longer the construction time is, the greater the construction risk is, and particularly, coring in hard formations is more difficult. Therefore, how to achieve coring in a complex marine environment, particularly in a hard stratum environment, is a problem which needs to be solved urgently in the field.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a rotary pressure-maintaining coring method for ocean drilling, which can realize pressure-maintaining coring, is more convenient to maintain and can adapt to coring in hard formations.

The technical scheme of the invention is as follows: a rotary pressure-maintaining coring method for offshore drilling is characterized in that: the method comprises the following steps:

1) the fishing spearhead is connected with the fishing spearhead through a fisher, the inner pipe assembly is thrown onto a seat ring in the outer pipe assembly positioned at the bottom of the hole, and after the throwing is successful, the connection between the fisher and the fishing spearhead is disconnected and the fisher is recovered to a drilling platform surface;

2) synchronously drilling the inner pipe assembly and the outer pipe assembly to a bottom hole stratum together, keeping an elastic clamp a of an elastic clamp mechanism and an elastic clamp b of an elastic clamp suspension mechanism in an open state, keeping an outer pipe drill bit and a middle pipe drill bit in contact with the bottom hole to carry out rotary coring footage, and mutually engaging a torque transmission convex shoulder of the outer pipe drill bit and a torque transmission spline of the middle pipe drill bit to transmit torque to drive the middle pipe drill bit to rotate, wherein the elastic clamp a bears the drilling pressure of the middle pipe drill bit and the resistance of a core sample entering a core pipe, and the elastic clamp b offsets the resistance of the core sample entering the core pipe, so that the outer pipe drill bit and the middle pipe drill bit are matched together to carry out coring;

3) the inner tube assembly b is driven to slide upwards along the inner tube assembly a by the fishing spearhead, the inner tube assembly a is not clamped to keep the original position and bear the reaction force of the inner tube assembly b for shearing a shearing copper pin, the inner tube assembly b is separated from the inner tube assembly a after the shearing copper pin is sheared, a shearing copper pin protective sleeve is arranged outside the shearing copper pin, so that the sheared short part of the shearing copper pin is always left in the inclined part of the elastic clamping bracket tube and cannot fall in the inner tube assembly a, the inner tube assembly a and the inner tube assembly b are prevented from being clamped in the coring process, a core tube with a core sample slides upwards to enter the inner tube assembly a, after the core tube slides upwards and is lifted to a position above a through hole of the ball valve, a spring drives the ball valve to push and drive the ball valve to slide downwards through a short section of the ball valve and realize 90 DEG overturning, the ball valve seals the lower end of an upper ball valve seat, and when the core tube reaches an upward limit, the sealing joint shoulder of the sealing mechanism contacts the sealing short section shoulder of the sealing short section;

the region from the upper part of the ball valve, which is contacted with the upper ball valve seat, to the lower part of the sealing joint shoulder, which is contacted with the sealing short section, is a stable pressure maintaining region;

4) the inner pipe assembly is separated from the snapping chamber through the fishing spearhead and is pulled out of a well mouth, a core sample is taken out, and the pressure-maintaining coring process is completed.

Furthermore, 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 axially move upwards along the inner pipe assembly a, the inner pipe assembly b is axially fixed in the inner pipe assembly a through an elastic clamping suspension mechanism, the inner pipe assembly b does not axially move, the inner pipe assembly b can axially move upwards only after the inner pipe assembly b is separated from the inner pipe assembly a, and the inner pipe assembly a comprises a fishing head, an elastic clamping mechanism, a pipe distributing spear, a middle pipe short joint, a sealing short joint, a 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, an elastic clip suspension mechanism, an elastic pin short section, a single-action mechanism, a conversion joint, an adjusting joint, a connecting pipe, a sealing mechanism, a connecting long pipe short section and a core pipe which are sequentially connected from top to bottom;

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 long pipe nipple, the ball valve driving nipple is located between a core barrel and a middle pipe, a spring is further arranged between the ball valve driving nipple and the middle pipe, 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 pipe shoulder through concave-convex matching, the spring limiting ring is located between the core barrel and the middle pipe, the lower end of the spring is in contact with a ball valve driving nipple spring shoulder and is propped by the ball valve driving nipple spring shoulder, the ball valve driving nipple spring shoulder is propped against the spring limiting ring through the spring;

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 on the inner wall of the short joint, 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 located inside the connecting tube and is axially movable along the connecting tube.

Further, the concrete implementation process that the pressure maintaining ball valve overturning sealing mechanism is matched with the core barrel to realize downward sliding and 90-degree overturning of the ball valve is as follows:

before coring and fishing are carried out, a core tube penetrates downwards from the inside of a through hole of a ball valve, 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 props against an upper ball valve seat, the upper ball valve seat upwards props against the ball valve to drive a short section to move upwards, a ball valve on the ball valve drive short section drives a short section spring shoulder to correspondingly move upwards, a spring limiting ring is limited by a middle tube shoulder on a middle tube, and a spring is compressed and increases elastic potential energy; when coring is completed and fishing is carried out, after the core tube is pulled out upwards from the through hole of the ball valve, the core tube does not limit the ball valve to overturn downwards any more, the spring with enough elastic potential energy is provided, the thrust of the spring is greater than the thrust of the bearing spring, so that the ball valve moves downwards along the long round hole of the ball valve tube under the thrust given by the spring, in the process of moving downwards of the ball valve, the ball valve overturning sliding groove is enabled to slide and rotate around the ball valve overturning driving pin fixed on the ball valve tube, meanwhile, the ball valve overturning torque is given and the ball valve is driven to overturn by 90 degrees, and when the ball valve reaches a downward limit position, the bearing spring is compressed to a lower ball valve seat and is contacted with.

Furthermore, the lower extreme of pressurize ball valve upset sealing mechanism is connected and is equipped with the mechanism that washes the core barrel, and the water outlet flow way is outer tube drill bit and well pipe drill bit clearance and core barrel and well pipe drill bit clearance.

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 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 being connected the long tube.

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 card pipe, water inlet, bullet card bracket pipe long pinhole, bullet card bracket pipe an, takes off the card pipe rake, and bullet card a sets up in the bullet card is indoor, and is connected with bullet card bracket a, and bullet card bracket a is connected and is set up inside taking off the card pipe, takes off card pipe and salvages spearhead fixed connection, and the bottom that takes off the card pipe is equipped with and is used for taking off the card pipe rake that the bullet card came out from bullet card room, is equipped with the water inlet on the lateral wall that takes off the card pipe, and bullet card bracket pipe long pinhole 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 pipe b, an elastic clip bracket pipe water outlet, an elastic clip bracket b, an elastic clip cavity, an elastic clip hole, an elastic clip b, an elastic clip cavity, an elastic clip bracket pipe inclined part and a shearing copper pin; the upper part of the elastic clip hanging mechanism is arranged in the pipe fitting, and the lower part of the elastic clip hanging mechanism is arranged in the middle pipe nipple.

The invention has the beneficial effects that: the invention has the following beneficial technical effects:

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;

the core sample coring is carried out by matching the drill bit and the middle pipe drill bit, and the dual-drill-bit coring mode is adopted, so that the core sample coring method can be suitable for the fourth-system sedimentary strata and bedrock, and the application range is wider;

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;

through setting up the shearing copper round pin protective sheath in the outside of shearing the copper round pin for the shearing copper round pin of the shorter part after cutting remains in bullet card bracket pipe rake all the time, and can not drop in inner tube assembly an, effectively prevents the dead emergence of coring in-process card.

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;

FIGS. 2 to 5 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, and the lower end of FIG. 4 connecting the upper end of FIG. 5;

FIG. 6 is a schematic structural view of an outer tube assembly;

FIG. 7 is a schematic structural view of an inner tube assembly;

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

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

FIG. 10 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. 11 is an enlarged schematic view at A of FIG. 10;

FIG. 12 is a schematic view showing a state in which the fishing and releasing process is performed after coring is completed (the releasing operation of the ejector pin suspending mechanism is completed);

FIG. 13 is an enlarged schematic view at B of FIG. 12;

FIG. 14 is an enlarged schematic view at C of FIG. 12;

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 D of FIG. 15;

FIG. 17 is an enlarged schematic view at E in FIG. 15;

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

FIG. 19 is an enlarged schematic view at F 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. 5 taken along line B-B1;

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-water inlet, 225-snapping bracket pipe long pin hole, 226-snapping bracket pipe a, 227-releasing pipe inclined part, 23-lifting device, 231-lifting pipe, 232-lifting pipe long pin hole, 233-first elastic pin, 24-suspension ring, 25-dispensing pipe, 250-dispensing pipe, 26-snapping suspension mechanism, 261-snapping bracket pipe b, 250-snapping pipe b, 262-snapping bracket pipe water outlet, 263-snapping bracket b, 264-snapping cavity, 265-snapping hole, 266-snapping b, 267-snapping cavity, 268-snapping bracket pipe inclined part, 27-base block, 28-middle pipe short section, 281-middle pipe short section shoulder, 29-shearing copper pin, 30-shearing copper pin protective sleeve, 31-elastic pin short section, 310-elastic pin long circular hole, 311-second elastic pin, 312-seating shoulder, 32-single-action mechanism, 321-upper thrust bearing, 322-mandrel, 323-copper sleeve, 324-bearing outer sleeve, 325-lower thrust bearing, 326-locking nut, 33-short joint, 34-conversion joint, 35-adjusting mechanism locking nut, 36-adjusting joint, 34-adjusting mechanism locking nut, 37-sealing short section, 371-sealing short section shoulder, 38-energy accumulator, 39-connecting pipe, 40-sealing mechanism, 401-quick-insertion one-way valve pressure measuring joint, 402-pressure channel, 403-sealing joint sealing ring, 404-sealing joint, 405-sealing joint shoulder, 41-one-way ball valve cavity, 42-one-way ball valve, 43-ball valve seat, 44-connecting pipe, 45-warm-pressure testing chamber, 46-connecting long pipe, 47-connecting long pipe, 48-core pipe, 49-middle pipe, 491-middle pipe shoulder, 50-pressure-maintaining ball valve turnover sealing mechanism, 5001-spring limiting ring, 5002-ball valve driving short section, 5003-spring, 5004-ball valve driving short section spring shoulder, 5005-ball valve pipe shoulder, 39-connecting pipe, 40-sealing mechanism, 5002-ball valve driving short, 5006-upper ball valve seat sealing ring, 5007-upper ball valve seat, 5008-ball valve pipe, 5009-ball valve, 5010-ball valve turnover driving bolt, 5011-ball valve shaft, 5012-ball valve turnover sliding groove, 5013-ball valve pipe long round hole, 5014-ball valve pipe window, 5015-lower ball valve seat, 5016-lower ball valve seat sealing ring, 5017-bearing spring, 5018-ball valve lower gland, 51-flushing water inlet, 52-flushing water outlet, 53-torque transmission spline, 54-water outlet, 55-petal blocking spring and 56-middle pipe drill bit.

Detailed Description

The invention will be further described with reference to the accompanying drawings and the detailed description below:

as shown in fig. 1 to 21, comprising the steps of:

1) the fishing spearhead 21 is connected with a fisher (not shown in the figure), the inner pipe assembly 20 is thrown into the outer pipe assembly 10 positioned at the bottom of the hole, after the throwing is successful, the releasing pipe is thrown along the rope, the connection between the fisher and the fishing spearhead is disconnected, and the fisher is recovered to the drilling platform surface;

2) after the drill rod is connected with the drilling machine, the drilling machine synchronously drills the inner pipe assembly 20 and the outer pipe assembly 10 down to the stratum at the bottom of the well through the drill rod, the elastic clamp a 221 of the elastic clamp mechanism 22 and the elastic clamp b 266 of the elastic clamp suspension mechanism 26 are kept in an open state, the axially fixed outer pipe drill bit 140 and the axially fixed middle pipe drill bit 56 are kept in contact with the bottom of the well to perform rotary coring and footage, the drill rod drives the outer pipe to rotate, the torque is transmitted through mutual engagement of the torque transmission shoulder 141 of the outer pipe drill bit 140 and the torque transmission spline 53 of the middle pipe drill bit 56 to drive the middle pipe drill bit 56 to rotate, in the process, the elastic clamp a 221 bears the drilling pressure of the middle pipe drill bit 56 and the resistance of the core sample entering the core pipe 48, and the elastic clamp b 266 counteracts the resistance of the core sample entering the core pipe 48;

3) the drill rod is detached, the fisher is thrown by throwing the rope, the fisher is clamped with the fishing spearhead, the fisher is lifted by the rope, so that the fishing spearhead 21 drives the inner pipe assembly b 202 to slide upwards along the inner pipe assembly a 201, the inner pipe assembly a 201 is not clamped and kept in the original position and bears the reaction force of the inner pipe assembly b 202 shearing the shearing copper pin 29, after the shearing copper pin 29 is sheared, the inner tube assembly b 202 and the inner tube assembly a 201 are disengaged, the core tube 48 filled with the core sample slides upwards to enter the inner tube assembly a 201, after the core tube 48 slides upwards and is lifted to a position above the through hole of the ball valve 5009, the spring 5003 drives the nipple 5002 to push the ball valve 5009 through the ball valve and drives the ball valve 5009 to slide downwards and realize 90-degree overturning, the ball valve 5009 seals the lower end of the upper ball valve seat 5007, and when the core tube 48 reaches an upward limit position, seal sub shoulder 405 of seal mechanism 40 contacts seal sub shoulder 371 of seal sub 37;

the region between the upper part of ball valve 5009 in contact with upper ball valve seat 5007 to the lower part of sealing joint shoulder 405 in contact with sealing nipple 37 is a stable pressure maintaining region;

4) the wellhead is salvaged out inner tube assembly 20 through the rope throwing fisher, and the concrete process is that fisher is connected with fishing spearhead 21, and then breaks away the card and lift out the wellhead with inner tube assembly 20 from snapping room 110 through fishing spearhead 21, takes out the rock core sample, accomplishes pressurize coring process.

The inner pipe assembly 20 is installed inside the outer pipe assembly 10, the inner wall of the outer pipe assembly 10 is sequentially provided with an elastic clamping chamber 110, a seat ring 120 and a centering ring 130 from top to bottom, and the bottom end of the outer pipe assembly 10 is provided with an outer pipe drill 140;

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 long pipe 25, a middle pipe short section 28, a short joint 33, a sealing short section 37, a connecting pipe 44, a middle pipe 49 and a pressure maintaining ball valve overturning sealing mechanism 50 which are sequentially connected from top to bottom; the inner pipe assembly b 202 comprises a lifting device 23, an elastic clip suspension mechanism 26, an elastic pin short section 31, a single-action mechanism 32, a conversion joint 34, an adjusting joint 36, a connecting pipe 39, a sealing mechanism 40, a connecting long pipe 46, a connecting long pipe short section 47 and a core pipe 48 which are sequentially connected from top to bottom;

the fishing spearhead 21, the snapping mechanism 22, the pipe 25, the middle pipe nipple 28, the short joint 33, the sealing nipple 37, the connecting pipe 44, the middle pipe 49 and the ball valve pipe 5008 on the pressure maintaining ball valve overturning sealing mechanism 50 are all in threaded connection or integrated structure; the lifting device 23 and the elastic clamp hanging mechanism 26, and the elastic pin short section 31, the single-action mechanism 32, the conversion joint 34, the adjusting joint 36, the connecting pipe 39, the sealing mechanism 40, the connecting long pipe 46, the connecting long pipe short section 47 and the core pipe 48 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 224, a snapping card bracket pipe long pin hole 225, a snapping card bracket pipe a 226 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 221 from the snapping card chamber 110, the side wall of the snapping card releasing pipe 223 is provided with the water inlet 224, and the snapping card bracket pipe long pin hole 225 is arranged in a middle cavity of the snapping card bracket pipe a 226;

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

the first elastic pin 233 arranged in the inner pipe assembly a 201 penetrates through the long pin hole 225 of the elastic clamping bracket pipe and the long pin hole 232 of the lifting pipe and then is fixedly arranged on the releasing pipe 223, and because the central axes of the long pin hole 225 of the elastic clamping bracket pipe and the long pin hole 232 of the lifting pipe are on the same straight line, the first elastic pin 233 can freely slide in the long pin hole 225 of the elastic clamping bracket pipe and the long pin hole 232 of the lifting pipe at the same time, so that the sleeving connection among the lifting pipe 231, the elastic clamping bracket pipe a 226 and the releasing pipe 223 is realized, and the connection between the lifting device 23 and the elastic clamping mechanism 22 is realized;

the upper part of the guide pipe 231 is disposed inside the spring clip bracket pipe a 226 and can move axially along the spring clip bracket pipe a 226, and the lower part is disposed inside the pipe 25; the top end of the lifting tube 231 is positioned below the long pin hole 225 of the cartridge holder tube;

the pipe-length 25 is provided with a pipe-length water outlet 250 which is obliquely arranged, the upper end of the pipe-length 25 is connected with the lower end of the spring clip bracket pipe a 226, the lower end of the pipe-length 25 is connected with the upper end of the middle pipe nipple 28, and the middle pipe nipple 28 is provided with a middle pipe nipple shoulder 281;

the connection part of the spring clip bracket pipe a 226 and the long pipe 25 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, that is, the weight of the whole inner pipe assembly 20 is dropped on the outer pipe assembly 10;

the spring clip hanging mechanism 26 comprises a spring clip bracket pipe b 261, a spring clip bracket pipe water outlet 262, a spring clip bracket b263, a spring clip cavity 264, a spring clip opening 265, a spring clip b 266, a spring clip cavity 267, a spring clip bracket pipe inclined part 268 and a shearing copper pin 29;

the upper part of the spring clip hanging mechanism 26 is arranged inside the pipe adapter 25, and the lower part is arranged inside the middle pipe nipple 28;

the spring clip bracket pipe b 261 is arranged inside the piping 25, the upper end of the spring clip bracket pipe b 261 is connected with the lower end of the lifting pipe 231, the lower end of the spring clip bracket pipe b 261 is provided with a spring clip bracket pipe inclined part 268 for releasing the spring clip 266 from the spring clip chamber 267, the spring clip bracket pipe inclined part 268 is arranged inside the middle pipe nipple 28, a spring clip opening 265 is further arranged between the spring clip bracket pipe inclined part 268 and the spring clip bracket pipe b 261, the spring clip bracket pipe b 261 is further provided with a plurality of spring clip bracket pipe water outlets 262 arranged in an array, the spring clip bracket pipe water outlets 262 are positioned above the spring clip bracket b263, the spring clip bracket b263 is transversely arranged inside the spring clip bracket pipe water outlets 262, a spring clip cavity 264 is arranged below the spring clip bracket b263, two spring clips b 266 are arranged below the spring clip cavity 264, the upper ends of the two spring clips 266 are fixed on the spring clip cavity 264 through a connecting piece (not shown in the figure), two elastic clips b 266 are positioned in an elastic clip chamber 267, the elastic clip chamber 267 is positioned inside the middle pipe short section 28, the lower end of the elastic clips b 266 is arranged on a lower base block 27, the base block 27 is arranged inside the middle pipe short section 28, and the elastic clips b 266 are abutted by a shoulder (not shown) of the middle pipe short section 28 when being opened at a certain angle, so that the elastic clips b 266 cannot move axially upwards, namely, the elastic clip hanging mechanism 26 is abutted by the shoulder of the middle pipe short section 28 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 pin short section 31 is arranged below the base block 27, the upper part of the elastic pin short section 31 is positioned inside the inclined part 268 of the elastic clamping bracket pipe, the shearing copper pin 29 is arranged on the upper part of the elastic pin short section 31, the shearing copper pin 29 transversely penetrates through the upper part of the elastic pin short section 31, and two ends of the shearing copper pin 29 extend into the inclined part 268 of the elastic clamping bracket pipe; a shearing copper pin protective sleeve 30 is arranged between the elastic clamping bracket pipe inclined part 268 and the middle pipe nipple 28, the outer wall of the elastic clamping bracket pipe inclined part 268 and the tail end of the shearing copper pin 29 are attached to the inner wall of the shearing copper pin protective sleeve 30, namely the shearing copper pin 29 does not extend into the shearing copper pin protective sleeve 30, and the outer wall of the shearing copper pin protective sleeve 30 is attached to the inner wall of the middle pipe nipple 28;

in this embodiment, the elastic pin nipple 31 and the snap bracket b263 are an integral structure;

an elastic pin long round hole 310 arranged axially is formed in the elastic pin short section 31, a second elastic pin 311 is arranged in the elastic pin long round hole 310, the second elastic pin 311 penetrates through the elastic pin long round hole 310 and the elastic pin short section 31 and then is fixedly arranged on the inclined part 268 of the elastic clamp bracket pipe, and the second elastic pin 311 can freely slide in the elastic pin long round hole 310;

the cartridge carrier tube angled section 268 and the shear pin protection sleeve 30 both seat on the seating shoulder 312 of the pogo pin sub 31, thereby allowing relative upward axial movement of the cartridge carrier tube angled section 268 relative to the pogo pin sub 31;

the lower part of the elastic pin short section 31 is positioned inside the middle pipe short section 28 and is seated on a middle pipe short section shoulder 281 of the middle pipe short section 28, so that the elastic pin short section 31 is supported by the middle pipe short section 28 and cannot move axially downwards, and the elastic clamp hanging mechanism 26 cannot move axially downwards;

the interior of the middle pipe nipple 28 is also provided with a single-action mechanism 32, and the single-action mechanism 32 is positioned below the elastic pin nipple 31;

the single-action mechanism 32 comprises an upper thrust bearing 321, a mandrel 322, a copper bush 323, a bearing outer sleeve 324, a lower thrust bearing 325 and a locking nut 326, the upper end of the mandrel 322 is in threaded connection with the bottom end of the elastic pin nipple 31, the bearing outer sleeve 324 is sleeved on the mandrel 322, the copper bush 323 is arranged between the bearing outer sleeve 324 and the mandrel 322, the upper end and the lower end of the copper bush 323 are respectively provided with the upper thrust bearing 321 and the lower thrust bearing 325, the bottom end of the mandrel 322 is provided with the locking nut 326, and the lower thrust bearing 325 is positioned above the locking nut 326;

the single-action mechanism 32 is connected with the adapter 34 through the bearing outer sleeve 324, the adapter 34 is connected with the upper end of the adjusting joint 36, the adjusting joint 36 is sleeved with an adjusting mechanism locking nut 35, the adjusting mechanism locking nut 35 is arranged at the lower end of the adapter 34, the adjusting joint 36 is positioned on the inner wall of the short joint 33, the lower end of the adjusting joint 36 is connected with the upper end of a connecting pipe 39, and the lower end of the connecting pipe 39 is connected with a sealing mechanism 40;

the upper part of the short joint 33 is connected with the middle pipe nipple 28, the lower part is connected with the upper end of the sealing nipple 37, and the lower end of the sealing nipple 37 is connected with the upper end of the connecting pipe 44;

the single-acting mechanism 32 prevents the core tube 48 from rotating along with the outer tube assembly 10, which causes core abrasion;

the sealing mechanism 40 comprises a quick-insert one-way valve pressure measuring joint 401, a pressure channel 402, a sealing joint sealing ring 403, a sealing joint 404 and a sealing joint shoulder 405;

the upper end of the sealing joint 404 is connected with the lower end of the connecting pipe 39, the middle part of the sealing joint 404 is provided with an axial pressure channel 402, the pressure measuring joint 401 of the quick-insertion one-way valve extends into the pressure channel 402, the sealing joint 404 is sleeved with a sealing joint sealing ring 403, sealing joint shoulders 405 are arranged on two sides of the sealing joint 404, and the lower end of the sealing joint 404 is connected with the upper end of the connecting long pipe 46, preferably in threaded connection;

the sealing mechanism 40 is positioned in the connecting pipe 44 and can axially move along the connecting pipe 44, when the sealing mechanism 40 reaches an upward limit position, a sealing joint shoulder 405 contacts the sealing short section 37, the sealing mechanism 40 stops moving upwards, and when the sealing mechanism 40 reaches a downward limit position, the adjusting joint 36 contacts the connecting pipe 39, and the sealing mechanism 40 stops moving downwards;

a one-way ball valve 42 is connected below the sealing mechanism 40, the one-way ball valve 42 is arranged in a one-way ball valve cavity 41, the one-way ball valve cavity 41 is arranged in the sealing joint 404, and the one-way ball valve 42 is arranged to enable air flow to flow into the pressure channel 402 of the sealing mechanism 40 only 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 43, an axial passage is arranged on the ball valve seat 43, the ball valve seat 43 is fixedly connected with the sealing joint 404, and the ball valve seat 43 is positioned in the connecting long pipe 46;

the lower end of the connecting long pipe 46 is connected with the upper end of the connecting long pipe nipple 47, the lower end of the connecting long pipe nipple 47 is fixedly connected with the upper end of the core pipe 48, preferably in threaded connection, the lower end of the core pipe 48 is connected with a petal blocking spring 55 for obtaining and fixing a core sample, and the core pipe 48 is positioned inside the middle pipe 49;

the pressure-maintaining ball valve overturning sealing mechanism 50 comprises a spring limiting ring 5001, a ball valve driving nipple 5002, a spring 5003, a ball valve driving nipple spring shoulder 5004, a ball valve pipe shoulder 5005, an upper ball valve seat sealing ring 5006, an upper ball valve seat 5007, a ball valve pipe 5008, a ball valve 5009, a ball valve overturning driving bolt 5010, a ball valve shaft 5011, a ball valve overturning sliding groove 5012, a ball valve pipe long round hole 5013, a ball valve pipe window 5014, a lower ball valve seat 5015, a lower ball valve seat sealing ring 5016, a bearing spring 5017 and a ball valve lower pressing cover 5018; the ball valve 5009 is provided with a ball valve shaft 5011 and a ball valve overturning sliding groove 5012, and the ball valve 5009 is provided with a through hole for the core pipe 48 to pass through;

a ball valve pipe sealing ring (not shown in the figure), a ball valve overturning driving bolt 5010 and a ball valve pipe long round hole 5013 are sequentially arranged on the ball valve pipe 5008 on the inner pipe assembly a 201 from top to bottom;

the upper end of the ball valve pipe 5008 is connected with the lower end of the middle pipe 49, preferably, the upper end of the ball valve pipe 5008 is connected with the lower end of the middle pipe 49 through threaded connection, a ball valve pipe sealing ring is arranged at the joint of the ball valve pipe 5008 and the middle pipe 49, a ball valve pipe window 5014 is arranged in the hollow interior of the ball valve pipe 5008, a ball valve pipe long round hole 5013 is arranged in the middle of the ball valve pipe 5008, a ball valve overturning driving bolt 5010 positioned in the ball valve pipe long round hole 5013 is fixed on the inner wall of the ball valve pipe 5008, and the ball valve overturning driving bolt 5010 extends into a ball valve overturning sliding groove 5012 in the;

the ball valve 5009 is fixedly arranged in a ball valve pipe window 5014 on the ball valve pipe 5008 through a ball valve shaft 5011, one end of the ball valve shaft 5011 is connected with the ball valve 5009, and the other end of the ball valve shaft 5011 extends into a ball valve pipe long round hole 5013 and can freely slide in the ball valve pipe long round hole 5013 along the axial direction;

an upper ball valve seat 5007 and a lower ball valve seat 5015 are arranged in the ball valve pipe 5008, an upper ball valve seat sealing ring 5006 is arranged at the joint of the ball valve pipe 5008 and the upper ball valve seat 5007, a lower ball valve seat sealing ring 5016 is arranged at the joint of the ball valve pipe 5008 and the lower ball valve seat 5015, by placing the upper ball seat seal 5006 in the gap between the upper ball seat 5007 and the inner wall of the ball valve tube 5008, so that the upper ball valve seat 5007 and the ball valve pipe 5008 form sealing contact, and in the same way, by disposing the lower ball seat seal 5016 in the gap between the lower ball seat 5015 and the inner wall of the ball valve tube 5008, the lower ball valve seat 5015 is in sealing contact with the ball valve pipe 5008, the upper end of the ball valve pipe 5008 is provided with a ball valve pipe shoulder 5005, the middle part of the ball valve pipe 5008 is in contact with the middle pipe 49 through concave-convex matching and props against the middle pipe 49, and the lower part of the ball valve pipe 5008 is connected with the middle pipe 49, preferably in threaded connection, so that the middle pipe 49 is more firmly connected with the ball valve pipe 5008;

the upper end of the upper ball valve seat 5007 is connected with the lower end of the ball valve driving nipple 5002, the lower end of the upper ball valve seat 5007 is contacted with the upper end of the ball valve 5009, the ball valve driving nipple 5002 is positioned below the long pipe nipple 47, the ball valve driving nipple 5002 is positioned between the core pipe 48 and the middle pipe 49, a spring 5003 is further arranged between the ball valve driving nipple 5002 and the middle pipe 49, the spring 5003 is sleeved on the ball valve driving nipple 5002, the upper end of the spring 5003 is contacted with the spring spacing ring 5001 and pressed by the spring spacing ring 5001, namely, the opened upper limit position of the spring 5003 is limited by the spring spacing ring 5001, the spring spacing ring 5001 is limited by the middle pipe shoulder 491 through concave-convex matching, the spring spacing ring 5001 is further compressed, the spring spacing ring 5001 is positioned between the core pipe 48 and the middle pipe 49, the lower end of the spring spacing ring 5001 is contacted with the ball valve driving spring 5004 and pressed by the ball, the ball valve driving nipple spring shoulder 5004 is in contact with the spring limiting ring 5001 and abuts against the spring limiting ring 5001, the ball valve driving nipple spring shoulder 5004 can be an outer protruding block of the ball valve driving nipple 5002 or a stop block fixedly connected with the ball valve driving nipple 5002, and the ball valve driving nipple spring shoulder 5004 is located above the ball valve pipe shoulder 5005;

the spring 5003 is arranged between the spring limiting ring 5001 and the ball valve driving nipple spring shoulder 5004, so that the spring 5003 is in a compressed state, and the ball valve pipe shoulder 5005 is positioned between the ball valve driving nipple 5002 and the middle pipe 49 and above the upper ball valve seat 5007;

the lower ball valve seat 5015 is provided with a bearing spring 5017 and a ball valve lower pressure cover 5018 from top to bottom, the upper end and the lower end of the bearing spring 5017 are respectively connected with the lower ball valve seat 5015 and the ball valve lower pressure cover 5018, and the upper end of the lower ball valve seat 5015 is contacted with the lower end of the ball valve 5009;

the bearing spring 5017 realizes the floating contact between the ball valve 5009 and the lower ball valve seat 5015;

the upper end of the ball valve pipe 5008 is connected with the lower end of the middle pipe 49, so that the pressure maintaining ball valve turnover sealing mechanism 50 is connected with the middle pipe 49, and the spring 5003 in a compressed state pushes the ball valve 5009 of the pressure maintaining ball valve turnover sealing mechanism 50 to slide downwards and turn over 90 degrees through the ball valve driving short section 5002.

In specific use, as shown in fig. 5, before coring and fishing, that is, when the core barrel is installed by using the present invention, the core barrel 48 passes downward through the through hole of the ball valve 5009, the core barrel 48 abuts against the ball valve 5009, after the core barrel is installed, since the latch mechanism 22 is limited in the latch chamber 110 and cannot pass upward through the latch chamber 110, and the latch suspension mechanism 26 is limited in the middle pipe nipple 28 and cannot pass over the middle pipe nipple 28, the inner pipe assembly b 202 cannot move axially at this time, and thus the core barrel 48 cannot move axially, that is, the core barrel is kept fixed axially; the ball valve 5009 is subjected to the thrust transmitted by the spring 5003 in a compressed state through the ball valve driving nipple 5002, because the ball valve 5009 is tightly attached by the core barrel 48 at the moment, which is equivalent to that the core barrel 48 provides the ball valve 5009 with a transverse resistance, the ball valve 5009 cannot turn downwards due to the thrust provided by the spring 5003, namely the core barrel 48 limits the ball valve 5009 to turn downwards, meanwhile, the ball valve 5009 is contacted by the core barrel 48, so that the ball valve 5009 upwards pushes against the upper ball valve seat 5007, the upper ball valve seat 5007 upwards pushes against the ball valve driving nipple 5002 to move upwards, a ball valve driving nipple spring shoulder 5004 on the ball valve driving nipple 5002 also correspondingly moves upwards, and the spring limiting ring 5001 is limited by the middle pipe shoulder 491 on the middle pipe 49, so that the spring is compressed and the elastic potential energy is increased; when coring is completed and fishing is performed, as shown in fig. 15 and 18, after the core tube 48 is pulled upward from the through hole of the ball valve 5009, the lateral resistance of the core tube 48 to the ball valve 5009 disappears, that is, the core tube 48 does not limit the downward turning of the ball valve 5009, because the elastic potential energy of the spring is sufficient, the ball valve 5009 moves downward along the long circular hole 5013 of the ball valve tube integrally under the thrust of the spring 5003, when the ball valve shaft 5011 connected to the ball valve 5009 contacts the ball valve turning driving bolt 5010, the thrust generated by the spring 5003 pushes the ball valve turning driving bolt 5010, and because the ball turning driving bolt 5010 is abutted by the ball turning sliding groove 5012 on the ball valve 5009, the ball valve turning driving bolt 5010 gives a torque to the ball valve 5009 to slide downward and turn 90 °, during the downward sliding of the ball valve 5009, the ball valve 5009 pushes the lower ball valve seat 5015 downward, and the lower ball 5015 compresses the load-bearing spring 5017 until the ball seat contacts the ball valve seat, that is, when ball valve 5009 reaches the downward limit position, lower ball valve seat 5015 contacts with the lower pressing cover of the ball valve;

through the operation, 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;

ball valve 5009 and last ball valve seat 5007 sealing contact realize the regional pressurize effect of ball valve 5009 upper portion, and the core pipe 48 is located the pressurize region of ball valve 5009 top this moment for the coring sample in the core pipe 48 is in the pressurize state, realizes the pressurize sample of coring ware.

Further, an energy storage chamber is arranged between the lower portion of the adjusting joint 36 and the upper portion of the sealing mechanism 40, the energy storage chamber is located inside the connecting pipe 39, an energy storage device 38 is arranged in the energy storage chamber, the energy storage device 38 is connected with the pressure measuring joint 401 of the quick-insertion check valve, and the energy storage device 38 is used for maintaining pressure to be stable.

Further, a warm-pressing test chamber 45 is arranged between the lower portion of the ball valve seat 43 and the upper portion of the connecting long pipe nipple 47, the warm-pressing test chamber 45 is located inside the connecting long pipe 46, and equipment for measuring warm-pressing parameters is installed in the warm-pressing test chamber 45.

Furthermore, the lower end of the pressure maintaining ball valve overturning sealing mechanism 50 is connected with a flushing mechanism (not shown in the figure) for flushing the core barrel 48, 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 48 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, drilling fluid at high pressure enters from the flushing water inlet 51 and then carries out high-pressure quick flushing on rock debris on the core barrel 48, the drilling fluid is discharged from the flushing water outlet 52, and the flushing mechanism is in threaded connection with the lower end of the ball valve pipe 5008 and is connected with the lower end of the ball valve lower pressing cover 5018.

In this embodiment, the flushing mechanism is provided with two water outlet flow passages, namely a first water outlet flow passage formed by the gap between the outer pipe drill bit 140 and the middle pipe drill bit 56 and a second water outlet flow passage formed by the gap between the core pipe 48 and the middle pipe drill bit 56, the drilling fluid enters the inner pipe assembly b 202 from the water inlet 224, then flows out from the elastic clamping bracket pipe water outlet 262, enters between the inner pipe assembly a 201 and the inner pipe assembly b 202, then flows out from the pipe-matching water outlet 250, and enters the region 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 passage, namely, from the gap between the outer pipe drill bit 140 and the middle pipe drill bit 56, the other path is discharged from a second water outlet flow channel, namely, discharged from a gap between the core tube 48 and the middle pipe drill bit 56, so that the drilling fluid can flush the core tube 48 through the flushing mechanism.

In this embodiment, the middle pipe drill bit 56 is connected with the flushing mechanism and is located below the flushing mechanism, the middle pipe drill bit 56 can 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 with the flushing mechanism, the flushing mechanism is connected with the ball valve pipe 5008 and the ball valve pipe 5008 is connected with the middle pipe 49, so that the middle pipe drill bit 56 is connected with the middle pipe 49, the middle pipe drill bit 56 is connected with the inner pipe assembly 20, and the inner pipe assembly 20 can drive the middle pipe drill bit 56 to rotate.

In the embodiment, the outer tube drill 140 is provided with the inward protruding torque transmission shoulder 141, and the torque transmission shoulder 141 is engaged with the outward protruding torque transmission spline 53 arranged 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 matched manner, and 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 48.

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 card hanging mechanism 26 is in an open state through the elastic card b 266 on the elastic card hanging mechanism 26 and is limited by the middle pipe short section 28, so that the elastic card hanging mechanism 26 is limited, and the elastic card hanging mechanism 26 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 reaches the downward limit, and the latch mechanism 22 and latch suspension mechanism 26 restrain the inner tube assembly 20 such that the inner tube assembly 20 cannot move upward axially.

After the inner pipe assembly 20 is successfully installed inside the outer pipe assembly 10, the fishing and coring process is started: the fishing spearhead 21 drives the disengaging pipe 223 and the first elastic pin 233 on the disengaging pipe 223 to axially move upwards along the long pin hole 232 of the lifting pipe and the long pin hole 225 of the snapping bracket pipe, and the first elastic pin 233 is enabled to move upwards to contact the top of the long pin hole 232 of the lifting pipe, then, under the driving of the disengaging pipe 223, the first elastic pin 233 continues to axially move upwards along the long pin hole 225 of the snapping bracket pipe, and drives the lifting pipe 231 to axially move upwards, so that the fishing spearhead 21 drives the lifting device 23 to axially move upwards through the snapping mechanism 22;

before the first elastic pin 233 contacts the upper end of the long pin hole 225 of the clip bracket pipe, the first elastic pin 233 drives the clip bracket pipe b 261 to move upward through the lifting pipe 231 of the lifting device 23, the clip bracket pipe b 261 drives the clip bracket pipe inclined portion 268 to move upward axially, before the clip bracket pipe inclined portion 268 contacts the clip b 266, the clip bracket pipe inclined portion 268 is pulled upward to shear the shear copper pin 29, the shear copper pin 29 is sheared into a longer section and a shorter section, the shorter section of the shear copper pin 29 is left in the clip bracket pipe inclined portion 268 and moves upward axially along with the clip bracket pipe inclined portion 268, so that the clip bracket pipe 268 can drive the second elastic pin inclined portion 311 connected with the clip bracket pipe 268 to move upward axially along the long pin hole 310 until the second elastic pin 311 contacts the top end of the elastic pin hole 310, when the second elastic pin 311 contacts the top end of the elastic pin long circular hole 310, the elastic clip bracket pipe inclined part 268 also contacts the elastic clip b 266, and the elastic clip bracket pipe b 261 continues to drive the elastic clip bracket pipe inclined part 268 to move upwards and axially downwards, so that the contact elastic clip b 266 is disconnected from the middle pipe short section 28, and the clip removal action is completed;

in the process that the shorter two sections of the shearing copper pin 29 are left in the cartridge holder pipe inclined part 268 and move axially upwards along with the cartridge holder pipe inclined part 268, the shorter part of the sheared shearing copper pin 29 does not pass through the topmost part of the shearing copper pin protective sleeve 30 all the time, so that the shorter part of the sheared shearing copper pin 29 cannot fall into the area between the inner pipe assembly b 202 and the inner pipe assembly a 201, and the occurrence of jamming can be prevented;

then, the whole elastic clip hanging mechanism 26 can move axially upwards, so that the elastic clip hanging mechanism 26 drives the single-acting mechanism 32, the sealing mechanism 40, the core tube 48 and the petal blocking spring 55 to move axially upwards in sequence through the second elastic pin 311;

the fishing spearhead 21 continues to drive the elastic clip hanging mechanism 26, the single-action mechanism 32, the sealing mechanism 40, the core tube 48 and the petal arresting spring 55 to axially move upwards through the clip-removing pipe 223, and the core tube 48 and the petal arresting spring 55 continue to axially move upwards until the sealing joint shoulder 405 of the sealing mechanism 40 contacts the sealing nipple shoulder 371 of the sealing nipple 37 to stop moving upwards, namely when the core tube 48 reaches an upward limit position, the sealing joint shoulder 405 contacts the sealing nipple shoulder 371, as shown in fig. 18;

before the inclined portion 227 of the releasing pipe contacts the elastic clamp a 221, the core pipe 48 and the petal-shaped check spring 55 are pulled upwards from the through hole of the ball valve 5009, so that the transverse resistance of the core pipe 48 to the ball valve 5009 is eliminated, namely, the core pipe 48 does not block the ball valve 5009 from overturning downwards, at the moment, the ball valve 5009 integrally moves downwards along the long round hole 5013 of the ball valve pipe under the thrust of the spring 5003, in the process of downwards moving the ball valve 5009, the ball valve overturning sliding groove 5012 is promoted to perform combined sliding and rotating motion around the ball valve overturning driving pin 5010 fixed on the ball valve pipe 5008, and meanwhile, the ball valve 5009 is given overturning torque and drives the ball valve 5009 to overturn by 90 degrees;

after the ball valve 5009 slides downwards and turns over by 90 degrees, the inclined part 227 of the card release pipe contacts the elastic card a 221, so that the elastic card a 221 is disconnected from the elastic card chamber 110, and the card release action is completed; after the releasing action is completed, the fishing spearhead 21 drives the releasing pipe 223 to continue to move axially upwards, so that the whole inner pipe assembly 20 can be pulled out from the outer pipe assembly 10, that is, after the releasing action of the inner pipe assembly b 202 is completed, the inner pipe assembly b can be driven by the fishing spearhead to move axially upwards, and then the core sample of the inner pipe assembly 20 is taken out, and the whole process of coring is completed.

The region from the part above the contact of the ball valve 5009 and the upper ball valve seat 5007 to the part below the contact of the sealing joint shoulder 405 and the sealing nipple 37 is a stable pressure maintaining region, and the core pipe 48 containing the core sample is positioned in the pressure maintaining region, so that the core is ensured to be positioned in the pressure maintaining region, the core is in a pressure maintaining state under high pressure, and pressure maintaining and coring are realized.

Various other changes and modifications to the above-described embodiments and concepts will become apparent to those skilled in the art from the above description, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.

Claims

1. A rotary pressure-maintaining coring method for offshore drilling is characterized in that: the method comprises the following steps:

4) releasing the inner pipe assembly from the snapping chamber through the fishing spearhead, pulling the inner pipe assembly out of a wellhead, and taking out a core sample to complete the pressure maintaining and coring process;

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 axially move upwards along the inner pipe assembly a, the inner pipe assembly b is axially fixed in the inner pipe assembly a through an elastic clamp hanging mechanism, the inner pipe assembly b does not axially move, the inner pipe assembly b can axially move upwards only after the inner pipe assembly b is separated from the inner pipe assembly b, and the inner pipe assembly a comprises a fishing spearhead, an elastic clamp mechanism, a long pipe distribution pipe, a middle pipe short joint, a sealing short joint, a 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, an elastic clip suspension mechanism, an elastic pin short section, a single-action mechanism, a conversion joint, an adjusting joint, a connecting pipe, a sealing mechanism, a connecting long pipe short section and a core pipe which are sequentially connected from top to bottom;

the core tube is positioned inside the middle tube;

2. Rotary pressure-holding coring method for offshore drilling according to claim 1, characterized by: the pressure maintaining ball valve overturning sealing mechanism is matched with the core barrel to realize the specific realization process that the ball valve slides downwards and overturns 90 degrees:

3. Rotary pressure-holding coring method for offshore drilling according to claim 1, characterized by: 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. Rotary pressure-holding coring method for offshore drilling according to claim 1, characterized by: sealing mechanism is connected with the lower extreme of connecting pipe including inserting check valve pressure measurement joint soon, pressure channel, sealing joint sealing washer, sealing joint and sealing joint circular bead, sealing joint's upper end, and the sealing joint middle part is equipped with axial pressure channel, inserts check valve pressure measurement joint soon and stretches into to pressure channel in, 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 being connected the long tube.

5. Rotary pressure-holding coring method for offshore drilling according to claim 1, characterized by: 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. Rotary pressure-holding coring method for offshore drilling according to claim 1 or 5, characterized by: the ball valve is in floating contact with the lower ball valve seat.

7. Rotary pressure-holding coring method for offshore drilling according to claim 1, characterized by: the bullet card mechanism includes bullet card a, bullet card bracket an, takes off card pipe, water inlet, bullet card bracket pipe long pinhole, bullet card bracket pipe an, takes off the card pipe rake, and bullet card a sets up in the bullet card is indoor, and is connected with bullet card bracket an, and bullet card bracket a is connected to set up and is taking off the card intraduct, takes off the card pipe and salvages spearhead fixed connection, and the bottom of taking off the card pipe is equipped with and is used for taking off the bullet card from bullet card room and takes off the card pipe rake that the card came out, is equipped with the water inlet on the lateral wall of taking off the card pipe, and the long pinhole setting of bullet card bracket pipe is inside the lumen of bullet card bracket pipe an.

8. Rotary pressure-holding coring method for offshore drilling according to claim 1, characterized by: 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. Rotary pressure-holding coring method for offshore drilling according to claim 1, characterized by: the elastic clip hanging mechanism comprises an elastic clip bracket pipe b, an elastic clip bracket pipe water outlet, an elastic clip bracket b, an elastic clip cavity, an elastic clip hole, an elastic clip b, an elastic clip cavity, an elastic clip bracket pipe inclined part and a shearing copper pin; the upper part of the elastic clip hanging mechanism is arranged in the pipe fitting, and the lower part of the elastic clip hanging mechanism is arranged in the middle pipe nipple.