CN106988697A - A kind of ocean gas hydrate freezes fidelity core drill - Google Patents

A kind of ocean gas hydrate freezes fidelity core drill Download PDF

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Publication number
CN106988697A
CN106988697A CN201710234774.4A CN201710234774A CN106988697A CN 106988697 A CN106988697 A CN 106988697A CN 201710234774 A CN201710234774 A CN 201710234774A CN 106988697 A CN106988697 A CN 106988697A
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China
Prior art keywords
assembly
tube
chamber
freezing
recovery
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CN201710234774.4A
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CN106988697B (en
Inventor
郭威
张鹏宇
贾瑞
王元
陈光华
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Jilin University
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Jilin University
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B25/00Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
    • E21B25/08Coating, freezing, consolidating cores; Recovering uncontaminated cores or cores at formation pressure
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B25/00Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
    • E21B25/18Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors the core receiver being specially adapted for operation under water

Abstract

A kind of ocean gas hydrate freezes fidelity core drill.Including outer pipe assembly, inner tube assembly and salvaging freezing assembly, inner tube assembly is arranged in outer pipe assembly, salvage the body of freezing assembly inwardly has incubation cavity, stores up cold chamber and rock core chamber successively, rock core intracavitary has a lifting arm, lifting arm lower end is provided with recovery hook, when salvaging freezing assembly enters outer pipe assembly upper end, recovery hook, which is caught, to be dragged for spearhead and is lifted inner tube assembly into core chamber by moving up for lifting arm.Present invention inner tube assembly whole in drilling process is located in core chamber, core temperature in low-temperature receiver reduction basket, suppress decomposition of hydrate, core chamber's bottom drilling fluid is also because low temperature solidifies, certain pressure can be maintained in core chamber, hydrate is not decomposed in lifting process in rock core, realizes that high-fidelity is sampled.

Description

A kind of ocean gas hydrate freezes fidelity core drill
Technical field
Fidelity core drill is freezed the present invention relates to a kind of ocean gas hydrate, it is adaptable to ocean gas hydrate Exploration Domain, obtains high-fidelity sea bed gas hydrate sample, significant for reservoir property analysis, resource assessment.
Background technology
Gas hydrates are formed under certain Temperature-pressure Conditions like ice and snow shape crystalline compounds, and hydrone is in hydrogen bond Effect is lower to form " cage ", and gas molecule (guest molecule) is filled in the hole of hydrone crystallization framework.Gas hydrates are wide General preservation is in permafrost band and seabed, because its reserves is huge, is a kind of clean energy resource, it is considered to be 21st century is potential The energy.Gas hydrates formation and preservation are in the environment of high pressure low temperature, and the drill sampling of gas hydrates is for hydration Thing evaluation and exploit significant, according to gas hydrates stabilizing voltage characteristic curve, if temperature or pressure condition become Change and exceed equilibrium condition, may result in gas hydrate dissociation, therefore very high requirement is proposed to core drilling work.Mesh Preceding gas hydrates sampler both domestic and external is main by two kinds:One kind is heat-insulation pressure keeping sampler, and one kind is that hole-bottom frozen takes Sample device.Heat-insulation pressure keeping sampler uses ball valve reprint pressurize, and maintains the pressure in basket with pressure compensator, uses guarantor Adiabator is incubated, and success rate of being cored in practical application is low;Gas hydrate hole-bottom frozen sampling method is existed by external source Bottom hole directly freezed gas hydrates rock core, gas hydrates core temperature is reduced to below equilibrium temperature to suppress water The decomposition of compound, so as to obtain hydrate fidelity sample.
The content of the invention
The present invention proposes a kind of ocean natural gas hydration according to ocean gas hydrate hole-bottom frozen technology sampling theorem Thing freezes fidelity core drill, by the way of active cools, and the hydrate suppressed in rock core is decomposed in lifting process, For the sampling of ocean hydrate high-fidelity.
In ocean gas hydrate freezing fidelity core drill, including an outer pipe assembly and one of the present invention Pipe assembly, it is characterised in that also salvage freezing assembly including one:
The outer tube upper end of the outer pipe assembly is provided with inwall in the middle part of adapter coupling, the outer tube of outer pipe assembly and is provided with seat Ring, the outer pipe bottom of outer pipe assembly is provided with a centering ring, and the outer tube lower end of outer pipe assembly is provided with drill bit;
Said inner tube assembly includes a hollow basket, and basket lower end is installed to be provided with pawl spring, rock core tube chamber There is emptying passage above piston, rock core tube cavity, basket upper end connects a bullet card holder by bearing, plays and installed in the middle part of card holder Have and a recovery tube is cased with outside bullet card and tension spring, upper pipe, recovery tube can be moved on card holder is played, and the upper end of recovery tube, which is provided with, drags for Spearhead, has hanging ring in the lower end of upper pipe, when inner tube assembly is placed in outer tube, and adapter coupling lower end is acted in bullet card and tension spring Boss limitation inner tube assembly is moved up;Hanging ring is stuck in limitation inner tube assembly on seat ring and moved down;
The freezing assembly of salvaging includes having an incubation cavity in a body, body, and incubation cavity inwardly has a storage cold Chamber, it is rock core chamber to store up cold intracavitary side, and rock core intracavitary has a lifting arm, and the lower end of lifting arm is provided with recovery hook, salvages freezing When assembly enters outer pipe assembly upper end, recovery hook, which is caught, to be dragged for spearhead and inner tube assembly lifting is arrived into rock by moving up for lifting arm In the chambers of the heart.
The course of work of drilling tool of the present invention is as follows:
1st, it is put under the inner tube assembly for finishing assembling in outer tube assembly and to bottom hole, bullet is opened in the presence of being stuck in tension spring Open, hanging ring is seated on seat ring, the play up and down of inner tube is limited, directly to core-drilling;
2nd, with the continuous drilling depth of drilling tool, rock core promotes the piston in basket to move up, and the flushing liquor in basket passes through row Empty passage discharge, until rock core is full of basket;
3rd, in drilling process, freezing assembly is salvaged in assembling, and low temperature cold source is injected into the cold chamber of storage;
4th, after the drilling for completing a round trip, freezing assembly is salvaged using the decentralization of winch rope, freezing assembly lower end is salvaged Into outer pipe assembly, recovery hook, which is caught, drags for spearhead, in the presence of the neck of recovery tube top, and bullet card is reclaimed, and is moved on on recovery tube After one segment distance, bottom neck blocks bullet bayonet lock, and lifting lower drilling tool together rises.Lifting arm is above carried by winch, inner tube is total Move up, the disconnected rock core of the card of pawl spring 14, moved on inner tube assembly in rock core chamber into recovery hook.
4th, a whole set of drilling tool is up with lifting of winch, now, and low-temperature receiver is dropped by conducting heat to whole inner tube assembly in freezing chamber Temperature.
5th, by after drilling tool lifting to drilling platforms, removal of core is placed in liquid nitrogen, in case detection and analysis.
The present invention obtains rock core by pawl spring, and rock core promotes basket piston stroking upward, and rock core is not bored during drilling depth Well liquid pollutes, in drilling process, and whole inner tube assembly is located at rock core intracavitary, and low-temperature receiver passes through the rock core temperature in the reduction basket that conducts heat Degree, suppresses decomposition of hydrate, and rock core bottom of chamber portion drilling fluid is also solidified because of low temperature, and certain pressure, rock can be also maintained in rock core chamber Hydrate is not decomposed in lifting process in the heart, realizes that high-fidelity is sampled.
Brief description of the drawings
Fig. 1 is the outer pipe assembly of the present invention and inner tube assembly front view.
Fig. 2 is inner tube assembly front view of the present invention.
Fig. 3 salvages freezing assembly front view for the present invention.
Fig. 4 is recovery tube front view.
Fig. 5 is recovery tube left view.
Legend:
1st, spearhead is dragged for, 2, adapter coupling, 3, spring catch, 4, recovery tube, 5, tension spring, 6, bullet card, 7, play bayonet lock, 8, bearing, 9th, seat ring, 10, emptying passage, 11, basket, 12, piston, 13, spacing ring, 14, pawl spring, 15, drill bit, 16, reamer, 17, Centering ring, 18, hanging ring, 19, outer tube, 20, low-temperature receiver hand-hole, 21, lifting arm, 22, incubation cavity, 23, store up cold chamber, 24, copper Heat transfer layer, 25, rock core chamber, 26, spring, 27, recovery hook, 28, positioning shaft sleeve, 29, locating shaft, 30, recovery hook spring catch, 31, Only move pin, 32, rivet, 33, relief valve, 34, suspension ring, 35, crowfoot frame, 36, play card holder, 37, play neck, 38, neck.
Embodiment
The threaded upper ends of outer tube 19 of the outer pipe assembly install adapter coupling 2, and the lower end of adapter coupling 2 is formed in outer tube 19 One baffle ring, the outer middle part inwall of pipe assembly outer tube 19 is provided with seat ring 9, and the outer pipe bottom of outer pipe assembly is provided with a centering ring 17, vertical direction is positioned at by seat ring 9 and centering ring 17 when inner tube assembly is entered in outer tube.The lower end of outer tube 19 of outer pipe assembly Provided with drill bit 15, reamer 16 is installed on the lower end outer wall of outer tube 19 of outer pipe assembly;Centering ring 17 and seat ring 9 is circumferentially disposed has Opening, during decentralization drilling tool to shaft bottom, flushing liquor is changed to circulate through opening by annular clearance circulation.
Inner tube assembly includes a hollow basket 11, and the lower end of basket 11, which is installed in pawl spring 14, the chamber of basket 11, pacifies Equipped with piston 12, there is the spacing ring 13 for preventing piston from coming off the lower section of basket 11, and there are emptying passage 10, rock core in the top of basket 11 The upper end of pipe 11 connects a column bullet card holder 36 by bearing 8, plays card holder 36 and is cased with a recovery tube 4, recovery tube 4 can be in bullet card Moved on frame 36, the upper end of recovery tube 4, which is provided with, drags for spearhead 1, bullet card 6 and tension spring 7 are installed playing the middle part of card holder 36, in bullet card There is hanging ring 18 lower end of frame 36, constitutes inner tube detent mechanism by spring catch 3, tension spring 5, bullet card 6, bullet bayonet lock 7, inner tube assembly is put When in outer pipe assembly, bullet card 6 is opened the baffle ring formed by adapter coupling 2 and blocked under the effect of tension spring 7, on limitation inner tube assembly Move.Hanging ring 18 is arranged on the lower section of bearing 8, when inner tube assembly is placed in outer pipe assembly, and hanging ring 18 is blocked by seat ring 9, Limitation inner tube assembly is moved down;Bearing 8 ensure that basket is not rotated with outer tube, reduce the disturbance to rock core;
Salvaging freezing assembly includes a body, and body stores up cold chamber 23 and rock to annular incubation cavity 22, annular is set gradually The chambers of the heart 25, the cold chamber upper end of annular storage, which has, a lifting arm 21, lifting arm in relief valve 33 and low-temperature receiver hand-hole 20, rock core chamber 25 Upper end is provided with the suspension ring 34 for connecting rope, and the lower end of lifting arm 21 is threadedly coupled crowfoot frame 35, and recovery hook 27 is fixed on On crowfoot frame 35, recovery hook 27 is in X-shape, and centre is hinged by recovery hook spring catch 30, forms bottom pawl and dewclaw, and two dewclaws lead to Cross pin 32 to connect, spring 26 is cased with pin 32;There is thrust pin 31 below dewclaw, the lower end of rock core chamber 25 has and the phase of thrust pin 31 Respective slot, both constitute the location structure of recovery hook 27.When salvaging freezing assembly enters outer pipe assembly upper end, recovery hook 27 Lower claw, which is caught, drags for spearhead 1, and the top of recovery hook 27 is only moved to contract and sealing lost between pin and rock core chamber and spacing, meanwhile, Under the compressing of the top bullet neck 37 of recovery tube 4, bullet card 6 is reclaimed, and is moved on on recovery tube 4 after a segment distance, recovery tube bottom neck 38 block bullet bayonet lock 7, lifting lower drilling tool together rise in rock core chamber, to inner tube completely into rock core chamber when, whole drilling tool Well head is together promoted to suspension ring 34.
The low-temperature receiver mixture that the present embodiment is taken is liquid nitrogen, low temperature, crude alcohol mixture, and during low-temperature condition, dry ice is melted into In the mixture of low-temperature condition, with the rise of temperature, dry ice sublimation stores up pressure rise in cold chamber 23, and pressure reaches relief valve During Opening pressure, CO2 gases are overflowed by relief valve 33.
The present embodiment filled heat insulating material in incubation cavity, for reducing the cold chamber of storage by outside tube wall and ambient heat, The insulation material that the present invention is used is aerogel blanket, and does encapsulation process in upper and lower ends.

Claims (4)

1. a kind of ocean gas hydrate freezes fidelity core drill, including an outer pipe assembly and an inner tube assembly, its It is characterised by that also including one salvages freezing assembly:
Outer tube (19) upper end of the outer pipe assembly is provided with the middle part of adapter coupling (2), the outer tube (19) of outer pipe assembly on inwall Provided with seat ring (9), the outer pipe bottom of outer pipe assembly is provided with a centering ring (17), and the outer tube lower end of outer pipe assembly is provided with drill bit (15);
Said inner tube assembly includes a hollow basket (11), and pawl spring (14), basket are installed in basket (11) lower end (11) intracavitary, which is provided with above piston (12), basket (11) inner chamber, emptying passage (10), and basket (11) upper end passes through axle Hold (8) and connect a bullet card holder (36), playing bullet card (6) and tension spring (7) are installed in the middle part of card holder (36), play card holder (36) overcoat There is a recovery tube (4), recovery tube (4) can be moved on card holder (36) is played, and the upper end of recovery tube (4), which is provided with, drags for spearhead (1), Playing the lower end of card holder (36) has a hanging ring (18), inner tube assembly be placed in outer tube (19) it is interior when, in bullet card (6) and tension spring (5) effect The boss limitation inner tube assembly of adapter coupling (2) lower end is moved up;Hanging ring (18) is stuck on seat ring (9) and limited under inner tube assembly Move;
Salvaging freezing assembly includes having an incubation cavity (22) in a body, body, and incubation cavity (22) inwardly has a storage cold Chamber (23), it is to have in rock core chamber (25), rock core chamber (25) under a lifting arm (21), lifting arm (21) to store up on the inside of cold chamber (23) End is provided with recovery hook (27), and when salvaging freezing assembly enters outer pipe assembly upper end, recovery hook (27), which is caught, drags for spearhead (1) simultaneously Inner tube assembly is lifted into rock core chamber by moving up for lifting arm (21).
2. a kind of ocean gas hydrate freezing fidelity core drill according to claim 1, it is characterised in that salvage It is annular to freeze the incubation cavity (22) in assembly body and store up cold chamber (23).
3. a kind of ocean gas hydrate freezing fidelity core drill according to claim 1 or 2, it is characterised in that There are relief valve (33) and low-temperature receiver hand-hole (20) in the cold chamber upper end of annular storage.
4. a kind of ocean gas hydrate freezing fidelity core drill according to claim 1 or 2 or 3, its feature exists In the lower end threaded connection crowfoot frame (35) of lifting arm (21), recovery hook (27) is fixed on crowfoot frame (35), recovery hook (27) In X-shape, centre is hinged by recovery hook spring catch (30), forms bottom pawl and dewclaw, and two dewclaws are connected by pin (32), pin Spring (26) is cased with nail (32);There is thrust pin (31) below dewclaw, rock core chamber (25) lower end has corresponding with thrust pin (31) Groove, both constitute the location structure of recovery hook (27).
CN201710234774.4A 2017-04-12 2017-04-12 Freezing fidelity core drill of ocean natural gas hydrate Active CN106988697B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020133724A1 (en) * 2018-12-26 2020-07-02 深圳大学 Fidelity retaining type coring device for rock sample

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Publication number Priority date Publication date Assignee Title
CN101514614A (en) * 2009-04-02 2009-08-26 吉林大学 Dry ice sublimation hole bottom refrigerating and pressure keeping sampler and sampling method
US20090229382A1 (en) * 2008-03-14 2009-09-17 Jilin University Sampling method and sampler for gas hydrates by hole bottom freezing
CN201835777U (en) * 2010-05-27 2011-05-18 吉林大学 Hole bottom freezing rope core drill
CN102943642A (en) * 2012-12-08 2013-02-27 吉林大学 Lifting-free borehole bottom rope freezing coring drilling tool and method
CN104653134A (en) * 2014-12-16 2015-05-27 吉林大学 Liquid-nitrogen natural-gas hydrate hole bottom freezing and rope coring drill bit
CN106194168A (en) * 2016-09-09 2016-12-07 河南理工大学 A kind of coal seam low temperature pinpoints ice-bound sampler and using method thereof
CN206053940U (en) * 2016-09-09 2017-03-29 河南理工大学 A kind of coal seam low temperature pinpoints ice-bound sampler

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090229382A1 (en) * 2008-03-14 2009-09-17 Jilin University Sampling method and sampler for gas hydrates by hole bottom freezing
CN101514614A (en) * 2009-04-02 2009-08-26 吉林大学 Dry ice sublimation hole bottom refrigerating and pressure keeping sampler and sampling method
CN201835777U (en) * 2010-05-27 2011-05-18 吉林大学 Hole bottom freezing rope core drill
CN102943642A (en) * 2012-12-08 2013-02-27 吉林大学 Lifting-free borehole bottom rope freezing coring drilling tool and method
CN104653134A (en) * 2014-12-16 2015-05-27 吉林大学 Liquid-nitrogen natural-gas hydrate hole bottom freezing and rope coring drill bit
CN106194168A (en) * 2016-09-09 2016-12-07 河南理工大学 A kind of coal seam low temperature pinpoints ice-bound sampler and using method thereof
CN206053940U (en) * 2016-09-09 2017-03-29 河南理工大学 A kind of coal seam low temperature pinpoints ice-bound sampler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020133724A1 (en) * 2018-12-26 2020-07-02 深圳大学 Fidelity retaining type coring device for rock sample

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