CN208252070U - A kind of seabed drilling machine gas hydrates active pressure maintaining core bit - Google Patents

A kind of seabed drilling machine gas hydrates active pressure maintaining core bit Download PDF

Info

Publication number
CN208252070U
CN208252070U CN201820699356.2U CN201820699356U CN208252070U CN 208252070 U CN208252070 U CN 208252070U CN 201820699356 U CN201820699356 U CN 201820699356U CN 208252070 U CN208252070 U CN 208252070U
Authority
CN
China
Prior art keywords
tube
pressure maintaining
connect
core
card holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201820699356.2U
Other languages
Chinese (zh)
Inventor
金永平
万步炎
黄筱军
王佳亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan University of Science and Technology
Original Assignee
Hunan University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan University of Science and Technology filed Critical Hunan University of Science and Technology
Priority to CN201820699356.2U priority Critical patent/CN208252070U/en
Application granted granted Critical
Publication of CN208252070U publication Critical patent/CN208252070U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model discloses a kind of seabed drilling machines to be mounted in outer tube assembly with gas hydrates active pressure maintaining core bit, including outer tube assembly, core-pipe subassembly and active pressure-keeping mechanism, core-pipe subassembly;Core-pipe subassembly includes fishing spearhead, plays snap-gauge, pressure retaining valve, safety valve, single action mechanism, core barrel, circlip and clip spring seat;Fishing spearhead is connect with card cylinder is received, and is received card cylinder and is connect with card holder is played, and plays snap-gauge and torsional spring setting is being received in card cylinder, pressure retaining valve and safety valve setting play card holder outer wall and are equipped with hanging ring, hanging ring is placed on the seat ring in outer tube on playing card holder;Single action mechanism is connect with inner pipe joint;The connection of the upper end of inner pipe joint and inner tube, basket are sleeved in inner tube;The lower end of the lower end inner tube of inner tube is connect with clip spring seat, and clip spring seat can be connect with active pressure-keeping mechanism.The utility model can carry out ftercompction to sea bed gas hydrate core sample in real time using active pressure-keeping mechanism, have simple and compact for structure, operation quickly and convenient, high reliability.

Description

A kind of seabed drilling machine gas hydrates active pressure maintaining core bit
Technical field
The utility model relates to a kind of gas hydrates core bits, more particularly, to a kind of seabed drilling machine natural gas Hydrate active pressure maintaining core bit.
Background technique
For sea bed gas hydrate as a kind of novel seabed energy resources, reserves are very huge.Global seabed is natural The reserves of gas hydrate are existing natural gas, twice of petroleum reserves, and in China sea area, reserves also very abundant, has wide Development prospect.The big developing country in short supply as a petroleum resources of China, exploration and development sea bed gas hydrate resource As alternative energy source, it has also become a national Major Strategic decision.Obtain the sea bed gas hydrate core sample of high quality Product are the key that carry out gas hydrates grade and constituent analysis.However, sea bed gas hydrate pressure maintaining used at present Core bit is designed primarily directed to drilling ship pylon churn, and mainly using the structure type of ball valve or reprint valve The non-active pressure maintaining sealing of sea bed gas hydrate is carried out, by ball valve and reprint valve self structure, the shadow for opening and closing mode It rings, so that the structure of every pressure maintaining core bit is sufficiently complex and quality and volume are bigger, meanwhile, by pressure maintaining core drill During tool is promoted to water surface drilling ship from seabed, since pressure maintaining core bit external pressure is steadily decreasing, so that pressure maintaining Core bit is vaporized and dilatancy by sea bed gas hydrate, leads to the reduction of coring drilling with keep up pressure drilling tool internal pressure, Jin Erying Ring subsequent sea bed gas hydrate high accuracy analysis.With the fast development of seabed drilling machine, implement sea using seabed drilling machine Bottom gas hydrates pressure maintaining core drilling is imitated compared with for drilling ship pylon churn in drilling cost, coring quality and coring Rate, mobility and operation concealment etc. are more competitive, but the development of seabed drilling machine core drill is also very immature, In order to obtain high quality sea bed gas hydrate core sample, the design of seabed drilling machine active coring drilling with keep up pressure drilling tool and coring are broken through Technique, develop is suitable for the compact type sea bottom hydrate pressure maintaining core bit with active pressure holding function of seabed drilling machine One urgent problem to be solved.
Summary of the invention
In order to solve the above-mentioned technical problem, the utility model provides that a kind of structure is simple, high reliablity, and can be to being taken The seabed drilling machine gas hydrates active pressure maintaining core bit of the progress active pressure maintaining sealing of sample.
The technical solution adopted in the utility model is: a kind of seabed drilling machine gas hydrates active pressure maintaining core drill Tool, including outer tube assembly, core-pipe subassembly and active pressure-keeping mechanism, the outer tube assembly include outer tube joint, bullet card room, seat ring, Outer tube, reamer and drill bit;Outer tube joint is connect with bullet card room, and bullet card room is connect with outer tube, and outer tube is connect with reamer, reaming Device is connect with drill bit;The core-pipe subassembly is mounted in outer tube assembly;Core-pipe subassembly includes fishing spearhead, receives card cylinder, plays snap-gauge, bullet Card holder, pressure retaining valve, safety valve, single action mechanism, inner tube, core barrel, circlip and clip spring seat;Fishing spearhead is connect with card cylinder is received, and receives card Cylinder is connect with card holder is played, and plays snap-gauge and torsional spring setting is being received in card cylinder, pressure retaining valve and safety valve setting are on playing card holder, pressure retaining valve The deflector hole for playing card holder can be connected to and receive card tube inner chamber, safety valve can be connected between the deflector hole for playing card holder and bullet card holder and outer tube Lacuna, play card holder outer wall and be equipped with hanging ring, hanging ring is placed on the seat ring in outer tube;Single action mechanism and inner pipe joint connect It connects;The lower end of inner pipe joint and the upper end of inner tube connect, and basket is sleeved in inner tube;In the bullet card holder deflector hole, mandrel Hole, inner pipe joint inner hole and core barrel between be respectively communicated with, in the inner hole of inner pipe joint be equipped with return water ball valve;The lower end of inner tube The lower end of inner tube is connect with clip spring seat, and circlip is arranged in clip spring seat, and clip spring seat can be connect with active pressure-keeping mechanism.
For above-mentioned seabed drilling machine in gas hydrates active pressure maintaining core bit, the bullet card holder is equipped with pressure maintaining Valve opening, pressure retaining valve be arranged in pressure maintaining valve opening, pressure retaining valve includes spool and push rod, and push rod one end is connect with spool, push rod it is another One end is equipped with push rod idler wheel, and the cylindrical surface of push rod idler wheel is contacted with snap-gauge bottom is played.
For above-mentioned seabed drilling machine in gas hydrates active pressure maintaining core bit, the bullet snap-gauge bottom is equipped with arc Groove, push rod idler wheel are placed in arc groove.
For above-mentioned seabed drilling machine in gas hydrates active pressure maintaining core bit, the active pressure-keeping mechanism includes sliding Moving sleeve, pressure maintaining cylinder, piston and charge valve;Pressure maintaining tube inner chamber is equipped with piston, and circle sealing is equipped between piston and pressure maintaining tube inner chamber, Lacuna between pressure maintaining cylinder inner piston and pressure maintaining cylinder bottom is connected to charge valve, and pressure maintaining cylinder side wall upper part is equipped with multiple positioned at same The steel ball hole of horizontal plane, steel ball are placed with steel ball in hole respectively;It is additionally provided with seal groove on the pressure maintaining cylinder inner wall, is set in seal groove There is sealing ring;Sliding sleeve is sleeved on pressure maintaining drum outer wall top, and spring is equipped between sliding sleeve inner wall and pressure maintaining drum outer wall, sliding Moving sleeve inner wall is equipped with the semi-circular recesses that can store steel ball.
For above-mentioned seabed drilling machine in gas hydrates active pressure maintaining core bit, the single action mechanism includes core Axis, thrust ball bearing, inner tube end cap and locking nut, the upper end of mandrel are connect with card holder is played, and the inner tube end cap is mounted on The upper end of inner pipe joint;Mandrel passes through inner tube end cap, and the lower end of mandrel is equipped with locking nut, the lower end surface of inner tube end cap and locking Spring is equipped between nut;Mandrel is equipped with flange, is supported on inner tube by thrust ball bearing and covers.
Above-mentioned seabed drilling machine is set between the mandrel and bullet card holder in gas hydrates active pressure maintaining core bit There is sealing ring;Sealing ring is equipped between the mandrel and inner tube end cap;Sealing is equipped between said inner tube end cap and inner pipe joint Circle;Sealing ring is equipped between said inner tube connector and inner tube;Sealing ring is equipped between said inner tube and clip spring seat.
Compared with prior art, the utility model has the beneficial effects that
(1) the active pressure-keeping mechanism of the utility model can quickly carry out being fastenedly connected sealing with core-pipe subassembly;And it can be real When to sea bed gas hydrate core sample carry out ftercompction;Effectively realize the fidelity to sampling.
(2) the utility model also has simple and compact for structure, operation quickly and convenient, high reliability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is that the active pressure-keeping mechanism of the utility model and core-pipe subassembly are fastenedly connected the structural schematic diagram after sealing.
In figure: 1- fishes out spearhead;2- outer tube joint;3- receives card cylinder;4- torsional spring;41- torsional spring pin;5- bullet snap-gauge;51- bullet card Axis;52- arc groove;6- bullet card room;7- pressure retaining valve;71- pressure maintaining valve opening;72- push rod;73- push rod idler wheel;8- bullet card holder;9- Safety valve;10- mandrel;101- sealing ring;11- hanging ring;12- seat ring;13- thrust bearing;14- inner tube end cap;141- sealing Circle;142- sealing ring;15- buffer spring;16- locking nut;17- inner pipe joint;171- sealing ring;18- return water ball valve;19- Outer tube;20- inner tube;21- core barrel;22- reamer;23- clip spring seat;231- sealing ring;24- circlip;25- drill bit;26- sliding Sleeve;261- semi-circular recesses;27- spring;28- pressure maintaining cylinder;281- steel ball hole;282- steel ball;283- seal groove;284- sealing Circle;29- piston;291- sealing ring;30- charge valve.
Specific embodiment
The utility model will be further described below with reference to the accompanying drawings.
As shown in Figs. 1-2, the utility model includes outer tube assembly, core-pipe subassembly and active pressure-keeping mechanism, it is characterized in that: institute Stating outer tube assembly includes outer tube joint 2, bullet card room 6, seat ring 12, outer tube 19, reamer 22 and drill bit 25;Outer tube joint 2 and bullet Card room 6 connects, and bullet card room 6 is connect with outer tube 19, and outer tube 19 is connect with reamer 22, and reamer 22 is connect with drill bit 25, seat ring 12 are arranged on the inner wall of appearance 19.
The core-pipe subassembly is mounted in outer tube assembly.Core-pipe subassembly includes fishing spearhead 1, receives card cylinder 3, plays snap-gauge 5, bullet card Frame 8, pressure retaining valve 7, safety valve 9, single action mechanism, inner tube 20, core barrel 21, circlip 24 and clip spring seat 23;It fishes out spearhead 1 and receives card cylinder 3 connections are received card cylinder 3 and are connect with bullet card holder 8, play snap-gauge 5 and torsional spring 4 and are blocked respectively by playing axis 51, the setting of torsional spring pin 41 in receipts In cylinder 3, playing snap-gauge 5 can rotate around axis 51 is played, and torsional spring 4 can be limited to snap-gauge 5 is played.The bullet card holder 8, which is equipped with, protects Pressure valve hole 71, pressure retaining valve 7 are arranged in pressure maintaining valve opening 71, and pressure retaining valve includes spool and push rod 72, one end of push rod 72 and pressure maintaining Valve core is fixed, and the other end of push rod 72 is equipped with push rod idler wheel 73.5 bottom of bullet snap-gauge is equipped with arc groove, push rod idler wheel 73 are placed in arc groove.It is rotated when playing snap-gauge 5 around axis 51 is played, plays 5 bottom of snap-gauge as cam mechanism, jacking or retraction Push rod 72 realizes the deflector hole for playing card holder 8 and receives the connection or closing of the inner cavity of card cylinder 3 so that pressure retaining valve 7 opens or closes. On playing card holder 8, safety valve 9 can be connected to the deflector hole for playing card holder 8 and play card holder 8 and outer tube 19 for the setting of safety valve 9 Between lacuna.
The outer wall for playing card holder 8 is equipped with hanging ring 11, and hanging ring 11 is placed on the seat ring 12 in outer tube 19;The single action Mechanism includes mandrel 10, thrust ball bearing 13, inner tube end cap 14 and locking nut 16, and the upper end of mandrel 10 is connect with card holder 8 is played, Sealing ring 101 is equipped between mandrel 10 and bullet card holder 8.The inner tube end cap 14 is mounted on the upper end of inner pipe joint 17, inner tube Sealing ring 141 is equipped between end cap 14 and inner pipe joint 17.Mandrel 10 passes through inner tube end cap 14, and the lower end of mandrel 10 is located at inner tube In connector 17, the lower end of mandrel 10 is equipped with locking nut 16, and spring is equipped between the lower end surface and locking nut of inner tube end cap 14 15;Mandrel 10 is equipped with flange, is supported on inner tube end cap 14 by thrust ball bearing 13.
The lower end of inner pipe joint 17 is connect with the upper end of inner tube 20, and sealing ring is equipped between inner pipe joint 17 and inner tube 20 171.Basket 21 is sleeved in inner tube 20;It is described play the deflector hole of card holder 8, the inner hole of mandrel 10, inner pipe joint 17 inner hole And core barrel 21 is interconnected, and return water ball valve 18 is equipped in the inner hole of inner pipe joint 17.The lower end of inner tube 20 and clip spring seat 23 connect It connects, sealing ring 231 is equipped between said inner tube 20 and clip spring seat 23, circlip 24 is arranged in clip spring seat 23, and clip spring seat 231 can It is connect with active pressure-keeping mechanism.
The active pressure-keeping mechanism includes sliding sleeve 26, pressure maintaining cylinder 28, piston 29 and charge valve 30;28 inner cavity of pressure maintaining cylinder Circle sealing 291,28 inner piston 29 of pressure maintaining cylinder and 28 bottom of pressure maintaining cylinder are equipped with equipped with piston 29, between 28 inner cavity of piston 29 and pressure maintaining cylinder Lacuna between portion is connected to charge valve 30, and the side wall upper part of pressure maintaining cylinder 28 is equipped with multiple steel ball holes positioned at same level 281, it is placed with steel ball 282 respectively in steel ball hole 281.Seal groove 283, seal groove are additionally provided in 28 upper inside wall of pressure maintaining cylinder Sealing ring 284, sealing when sealing ring 284 is connect for pressure maintaining cylinder 283 with clip spring seat 231 are equipped in 283.26 sets of sliding sleeve Spring 27, sliding sleeve 26 are equipped between the top of 28 outer wall of pressure maintaining cylinder, 28 outer wall of 26 inner wall of sliding sleeve and pressure maintaining cylinder Inner wall is equipped with the semi-circular recesses that can store steel ball 282.
When the utility model is used, specific steps are as follows:
(1) before coring drilling, active pressure-keeping mechanism is separated with core-pipe subassembly using the device of unloading on the drilling machine of seabed;Benefit Core-pipe subassembly is transferred to the outer tube assembly at drilling hole bottom with the rope salvaging winch on the drilling machine of seabed, the suspension of core-pipe subassembly Ring 11 will be hung on the seat ring 12 of outer tube assembly, play snap-gauge 5 by the radial constraint of the bullet card room 6 of outer tube assembly, make to receive card cylinder 3 Position move vertically, force and play snap-gauge 5 and rotate around axis is played, play snap-gauge 5 and trigger push rod idler wheel 73 and push rod 72 It is moved down along axis, and the spool of pressure retaining valve 7 is opened, keep pressure retaining valve 7 in the open state.
It transfers by sea bed gas hydrate active pressure maintaining core bit to before seabed, by charge valve 30 to actively The pre- filling with inert gas in 28 inner cavity of pressure maintaining cylinder of pressure-keeping mechanism, so that piston 29 is moved to the top position of pressure maintaining cylinder 28.
(2) during coring drilling, the constantly incision sea bed gas hydrate stratum of drill bit 25, so that sea-bottom natural gas water It closes object constantly to enter in core barrel 21, the seawater in core barrel 21 will pass through return water ball valve 18, the inner hole of inner pipe joint 17, mandrel 10 inner holes, the deflector hole for playing card holder 8 receive the draining outward of card cylinder 3.
(3) after coring drilling, core-pipe subassembly is mentioned to aperture, 6 pairs of bullet card room bullet snap-gauge 5 using rope salvaging winch Radial constraint release, receive 3 position of card cylinder moved down along axis, push rod idler wheel 73 and 72 position of push rod are moved vertically, are pushed away Bar idler wheel 73, which is moved to, to be played in arc groove set by 5 bottom of snap-gauge, is resetted pressure retaining valve 7 and is closed, realizes on core-pipe subassembly The sealing at end.
(4) active pressure-keeping mechanism is connect using the device of unloading on the drilling machine of seabed with clip spring seat 23, cooperates active pressure maintaining Sealing ring 284 in mechanism, realization are fastenedly connected core-pipe subassembly lower end.

Claims (6)

1. a kind of seabed drilling machine gas hydrates active pressure maintaining core bit, including outer tube assembly, core-pipe subassembly and active Pressure-keeping mechanism, it is characterized in that: the outer tube assembly includes outer tube joint, bullet card room, seat ring, outer tube, reamer and drill bit;Outer tube Connector is connect with bullet card room, and bullet card room is connect with outer tube, and outer tube is connect with reamer, and reamer is connect with drill bit;The core pipe Component is mounted in outer tube assembly;Core-pipe subassembly includes fishing spearhead, receives card cylinder, play snap-gauge, play card holder, pressure retaining valve, safety valve, list Motivation structure, inner tube, core barrel, circlip and clip spring seat;Fishing spearhead is connect with card cylinder is received, and is received card cylinder and is connect with card holder is played, plays snap-gauge It is being received in card cylinder with torsional spring setting, on playing card holder, pressure retaining valve can be connected to the deflector hole for playing card holder for pressure retaining valve and safety valve setting With receipts card tube inner chamber, safety valve can be connected to the deflector hole for playing card holder and play the lacuna between card holder and outer tube, play on card holder outer wall Equipped with hanging ring, hanging ring is placed on the seat ring in outer tube;Single action mechanism is connect with inner pipe joint;The lower end of inner pipe joint with it is interior The upper end of pipe connects, and basket is sleeved in inner tube;It is described play card holder deflector hole, mandrel inner hole, inner pipe joint inner hole and rock It is respectively communicated between core pipe, return water ball valve is equipped in the inner hole of inner pipe joint;The lower end of the lower end inner tube of inner tube and clip spring seat connect It connects, circlip is arranged in clip spring seat, and clip spring seat can be connect with active pressure-keeping mechanism.
2. seabed drilling machine according to claim 1 gas hydrates active pressure maintaining core bit, it is characterized in that: described Bullet card holder be equipped with pressure maintaining valve opening, pressure retaining valve is arranged in pressure maintaining valve opening, and pressure retaining valve includes spool and push rod, push rod one end with Spool connection, the other end of push rod are equipped with push rod idler wheel, and the cylindrical surface of push rod idler wheel is contacted with snap-gauge bottom is played.
3. seabed drilling machine according to claim 2 gas hydrates active pressure maintaining core bit, it is characterized in that: described It plays snap-gauge bottom and is equipped with arc groove, push rod idler wheel is placed in arc groove.
4. seabed drilling machine according to claim 1 gas hydrates active pressure maintaining core bit, it is characterized in that: described Active pressure-keeping mechanism includes sliding sleeve, pressure maintaining cylinder, piston and charge valve;Pressure maintaining tube inner chamber is equipped with piston, piston and pressure maintaining cylinder Circle sealing is equipped between inner cavity, the lacuna between pressure maintaining cylinder inner piston and pressure maintaining cylinder bottom is connected to charge valve, pressure maintaining cylinder side wall Top is equipped with multiple steel ball holes positioned at same level, and steel ball is placed with steel ball in hole respectively;On the pressure maintaining cylinder inner wall also Equipped with seal groove, sealing ring is equipped in seal groove;Sliding sleeve is sleeved on pressure maintaining drum outer wall top, sliding sleeve inner wall and pressure maintaining Spring is equipped between drum outer wall, sliding sleeve inner wall is equipped with the semi-circular recesses that can store steel ball.
5. seabed drilling machine according to claim 1 gas hydrates active pressure maintaining core bit, it is characterized in that: described Single action mechanism include mandrel, thrust ball bearing, inner tube end cap and locking nut, the upper end of mandrel is connect with card holder is played, described Inner tube end cap be mounted on the upper end of inner pipe joint;Mandrel passes through inner tube end cap, and the lower end of mandrel is equipped with locking nut, inner tube Spring is equipped between the lower end surface and locking nut of lid;Mandrel is equipped with flange, is supported on inner tube end cap by thrust ball bearing On.
6. seabed drilling machine according to claim 5 gas hydrates active pressure maintaining core bit, it is characterized in that: described Sealing ring is equipped between mandrel and bullet card holder;Sealing ring is equipped between the mandrel and inner tube end cap;Said inner tube end cap and interior Sealing ring is equipped between pipe fitting;Sealing ring is equipped between said inner tube connector and inner tube;It is set between said inner tube and clip spring seat There is sealing ring.
CN201820699356.2U 2018-05-11 2018-05-11 A kind of seabed drilling machine gas hydrates active pressure maintaining core bit Active CN208252070U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201820699356.2U CN208252070U (en) 2018-05-11 2018-05-11 A kind of seabed drilling machine gas hydrates active pressure maintaining core bit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201820699356.2U CN208252070U (en) 2018-05-11 2018-05-11 A kind of seabed drilling machine gas hydrates active pressure maintaining core bit

Publications (1)

Publication Number Publication Date
CN208252070U true CN208252070U (en) 2018-12-18

Family

ID=64635397

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201820699356.2U Active CN208252070U (en) 2018-05-11 2018-05-11 A kind of seabed drilling machine gas hydrates active pressure maintaining core bit

Country Status (1)

Country Link
CN (1) CN208252070U (en)

Similar Documents

Publication Publication Date Title
CN101864916B (en) Hole bottom freezing cord coring drill and coring method thereof
FR2484525A1 (en) HYDRAULIC CONNECTION APPARATUS AND METHOD, ESPECIALLY FOR SUBMARINE PETROLEUM WELL TEST TRAIN
CN107313732B (en) Rope rotation type heat preservation and pressure maintaining sampling drilling tool
FR2484523A1 (en) HYDRAULIC FLUID SUPPLY SYSTEM AND METHOD FOR WELL TOOL
CN106761513B (en) A kind of rope salvaging type coring drilling with keep up pressure drilling tool
CN106351597B (en) A kind of gas hydrates pressurize cord coring drill suitable for seabed drilling machine
CN102305022B (en) Salvage-type casing pipe drilling tool for drilling
CN201835777U (en) Hole bottom freezing rope core drill
CN206174904U (en) Gas hydrate pressurize wire line coring drilling tool suitable for seabed rig
CN207673305U (en) A kind of coal bed gas seismic exploration original position coring drilling with keep up pressure drilling tool
CN104499945A (en) Static pile driver and reaming and pile sinking machine combination
CN208252070U (en) A kind of seabed drilling machine gas hydrates active pressure maintaining core bit
CN109751003B (en) Safe rotary pressure-maintaining coring method for ocean drilling
CN206399686U (en) A kind of rope impact type heat-insulation pressure keeping Sampling driller
CN2748902Y (en) Fidelity and sampling integrated deep-sea sediment sampler
CN107219090A (en) Seabed refrigerating and pressure keeping formula gravity piston sampler and its sampling method
JP5390206B2 (en) Core sampling device used in the wire line system composed of inner barrel
CN105525885B (en) A kind of pole unconsolidated formation is rotatably inserted into formula coring tool
CN205091147U (en) Fidelity sampler
CN102155178A (en) Large-diameter coalbed methane core drill bit
CN209942779U (en) Check valve opening control mechanism of pressure maintaining rope coring drilling tool
CN206627305U (en) Seabed refrigerating and pressure keeping formula gravity piston sampler
CN106988697B (en) Freezing fidelity core drill of ocean natural gas hydrate
CN108625807A (en) A kind of engineering exploration cord coring drill suitable for seabed drilling machine
CN2903961Y (en) Coal field drilling gas fidelity sampler

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant