CN109113612A - Gas hydrates paddle type mill refrigerating and pressure keeping double acting rope Sampling driller and method - Google Patents
Gas hydrates paddle type mill refrigerating and pressure keeping double acting rope Sampling driller and method Download PDFInfo
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- CN109113612A CN109113612A CN201811016787.5A CN201811016787A CN109113612A CN 109113612 A CN109113612 A CN 109113612A CN 201811016787 A CN201811016787 A CN 201811016787A CN 109113612 A CN109113612 A CN 109113612A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/08—Coating, freezing, consolidating cores; Recovering uncontaminated cores or cores at formation pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/10—Formed core retaining or severing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/18—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors the core receiver being specially adapted for operation under water
Abstract
Gas hydrates paddle type mill refrigerating and pressure keeping double acting rope Sampling driller and method, wherein Sampling driller includes fisher, drilling tool outer tube, drilling tool inner tube assembly and drill bit, drilling tool inner tube assembly includes paddle type mill vibration sampling mechanism, freezing by change of state mechanism, pressure holding and coring mechanism, and the present invention guarantees the integrality of gas hydrates rock core using paddle type mill vibration sampling technique；Ensure the stability of gas hydrates rock core using heat-insulation pressure keeping sampling technique；To freeze sampling technique auxiliary heat-insulation pressure keeping sampling technique, in pressure maintaining failure, is acted on by the decalescence of low temperature phase change liquid and gas hydrates rock core is chilled to -40 DEG C, it is ensured that gas hydrates do not decompose；In summary the coring success rate of non-lithology deposit gas hydrates can be improved in the gas hydrates paddle type mill refrigerating and pressure keeping double acting rope Sampling driller and method that present invention proposes.
Description
Technical field
The present invention relates to a kind of gas hydrates paddle type mill refrigerating and pressure keeping double acting rope Sampling driller and methods, especially
Suitable for the Gas Hydrate Drilling coring field non-lithology deposit.
Background technique
China's conventional gas and oil resource has been far from satisfying the demand of economy and society development.Gas hydrates are mainly assigned
It is stored in world ocean continental margin and high latitude tundra, has the characteristics that energy resource density is high, distribution is wide, scale is big, it is shallow to bury,
And the natural gas of output can satisfy the requirement of the energy, economy and environment, be the new cleaning fuel with commercial exploitation prospects.
Gas hydrates can be only present under the conditions of certain temperature and pressure, generally require temperature lower than 0 DEG C~10 DEG C, and pressure is high
In 10MPa, once temperature increases or pressure reduction, methane gas can then escape, solid gas hydrate will be decomposed, therefore
How a great problem that the gas hydrates sample of high-fidelity be natural gas hydrate exploration exploitation is obtained.Countries in the world all exist
Actively carry out the research work in terms of gas hydrate fidelity drill sampling.Current gas hydrate fidelity both domestic and external takes
Sample device is mainly by two kinds of mentalities of designing: one is bottom hole heat-insulation pressure keeping sampler, another kind is hole-bottom frozen sampler.
Heat-insulation pressure keeping sampling method be using ball valve and flap valve etc. rock core by card have no progeny in lifting process to special
The pressure maintaining basket of design is closed and is sealed, and realizes passive type heat preservation using thermal insulation material, that is, passes through mechanical pressure maintaining
Mode keeps the pressure and temperature in situ of gas hydrates reservoir to obtain Hi-Fi gas hydrates rock core.It is this
Sampler obtains rock core using mechanical simple active pressure maintaining mode, and method inherently has technological deficiency.Once machine
The leakproofness of tool pressure-keeping mechanism is slightly decreased, then rock core cannot keep initial pressure, coring is caused to fail.And when sampling
After the design pressure of device reaches a certain level, if it is desired to increase pressure maintaining ability again, then the material of sampler and and leakproofness
Needs can be done very big raising, and this is not easy to accomplish.The heat preserving method of rock core mainly uses thermal insulation material in hole
Realize passive type heat preserving method, under the conditions of the complicated thermal condition of drill sampling, the heat preserving method of passive type is unable to maintain that naturally
The original temperature of gas hydrate rock core.Only external respective ones use thermoelectric (al) type inner tube heat preserving mode, but its heat insulation effect
Unsatisfactory, the success rate that brill obtains gas hydrate fidelity rock core is lower.
Gas hydrate hole-bottom frozen sampling method is to be passed through using cold source in hole-bottom frozen gas hydrates sample
Low temperature reduces the critical decomposition pressure of gas hydrates, while exciting self-shield effect, inhibits gas hydrate dissociation, obtains
The method for obtaining gas hydrates sample.Hole-bottom frozen sampling method using can phase change fluid as cold source, cold source is stored in
The storage of bottom hole drilling tool is cold intracavitary, after drilling, triggers the control mechanism of drilling tool, cold source is injected into freezing chamber, passes through cold source
Gas hydrates in sample cell are chilled to the low-temperature range of a requirement by gasification heat absorption.But it can change in this way
Become the original basic physics of gas hydrates rock core, the test datas such as sound wave and the resistivity of rock core is caused to become
Change.
Summary of the invention
It is an object of the invention in view of the above shortcomings of the prior art, provide a kind of gas hydrates paddle type mill freezing
Pressure maintaining double acting rope Sampling driller and the method being sampled using the drilling tool, gas hydrates paddle type mill refrigerating and pressure keeping are double
Acting cord Sampling driller is the paddle type mill coring tool of hydraulic-driven, and gastight sampling technology and freezing sampling technique are integrated
Within a set of drilling tool, the high-fidelity coring of gas hydrates is realized by refrigerating and pressure keeping double action.
In order to achieve the above objectives, this institute, which invents, adopts the following technical scheme that:
Gas hydrates paddle type mill refrigerating and pressure keeping double acting rope Sampling driller, the Sampling driller include fisher, bore
Have outer tube, drilling tool inner tube assembly and drill bit, the setting of drilling tool inner tube assembly is in drilling tool outer tube, therebetween between ring-type
The drilling working end of drilling tool outer tube is arranged in gap, drill bit, which is characterized in that drilling tool inner tube assembly includes paddle type mill vibration sampler
Structure, freezing by change of state mechanism, pressure holding and coring mechanism,
Wherein paddle type mill vibration sampling mechanism includes control-rod, valve, sealing ring, piston, valve body, valve spring and anvil living, institute
The groove for being equipped at the top of control-rod and connecting with fisher is stated, the boss on control-rod top is seated in the concave station on drilling tool outer tube top；
The valve living, sealing ring, piston, valve body, valve spring and anvil are set in outside control-rod and are coaxially disposed with control-rod；Valve living
It is placed in above valve body, the lower part of valve living and piston contact；Piston is located at valve inner, and the diameter in the middle part of piston is greater than valve body top
Aperture；Valve spring is arranged in valve inner, the top of valve spring and piston contact, and the lower part of valve spring is contacted with anvil；It is set on anvil
It is equipped with the concave ring groove for fixed valve body, anvil is divided into two parts by concave ring groove, is partially disposed in valve body above concave ring groove
Interior, the bottom of being partially disposed in outside valve body below concave ring groove, anvil is connect with cavity pipe, and wherein cavity bottom of the tube is spacious
Mouth formula structure, cavity pipe are divided into two chambers, respectively cold source chamber and pressure chamber, and cold source chamber is located above pressure chamber；
Wherein freezing by change of state mechanism includes exhaust valve, cold source chamber and control valve, is covered on the inner wall of the cold source chamber cold
Source chamber insulating layer；The exhaust valve is mounted on the cold source inlet of cavity pipe, exhaust valve include exhaust valve, exhaust valve spring and
Exhaust plug, the exhaust valve are connect by screw thread with cavity pipe；The exhaust valve spring and exhaust plug setting are being vented
One end of valve inner, exhaust valve spring is connect with exhaust valve, and the other end of exhaust valve spring is connect with exhaust plug, exhaust
The pretightning force of valve spring is used to withstand on exhaust plug the through-hole of exhaust valve；The control valve includes control valve core, control
Valve spring, control valve jacking block and jacking block room, the control valve spring are used to for control valve core being pressed on the outlet of cold source chamber；It is described
Control valve jacking block is arranged in the slideway of control-rod, and a part of control valve jacking block protrudes from control-rod and is resisted against control valve
The lower part of core, for locking control valve core, when control-rod uplink, control valve jacking block is pressed by control valve core is located at control
In the jacking block room of bar slide bottom processed；
Wherein pressure holding includes pressure chamber, flap valve and torsional spring, and the inner wall of the pressure chamber is covered with pressure chamber
Insulating layer, the fixing end of the flap valve and the lower sidewall of cavity pipe are hinged, and hinged place is provided with torsional spring, flap valve
Free end is contacted with control-rod, and the side of flap valve towards pressure chamber is provided with insulating layer on flap valve；The torsional spring setting exists
The hinged place of flap valve and cavity pipe, torsional spring is for driving flap valve to overturn；
Wherein coring mechanism includes core barrel, coring cylinder piston, cutting tooth, basket and pulls spring, the basket
It is coaxially disposed with cavity pipe, the top of basket is connect with cavity pipe, and the bottom of basket is connected with cutting tooth；The coring
Cylinder is located at barrel interior and is sitting in basket on step, and core barrel is internally provided with the core barrel connecting with control-rod bottom
Piston；The spring of pulling is fixed on core barrel lower part, so that gas hydrates rock core will not be dropped out from core barrel when coring.
Gas hydrates paddle type mill refrigerating and pressure keeping double acting rope sampling method, which is characterized in that the sampling method is adopted
It is sampled with the gas hydrates paddle type mill refrigerating and pressure keeping double acting rope Sampling driller, specifically includes following step
It is rapid:
1. the earth's surface preparation stage: before carrying out gas hydrates coring, pressure intracavitary according to cold source first
It is self-possessed with control valve and sets the pretightning force of control valve, installation control valve core, control valve spring and control valve jacking block, so that when control
When the back pressure of spool lower part is less than 1MPa, control valve, which automatically opens, makes outflow in the self cooling source chamber of cold source；Then by exhaust valve, row
Spring for valve and exhaust plug are removed from cavity pipe, cold source chamber are pre-chilled to cold source intracavitary injection liquid nitrogen, cold source is intracavitary
The temperature in portion terminates to be pre-chilled when reaching -100 DEG C, and after pre-cooling, to the intracavitary injection cold source of cold source, the injection rate of cold source is cold source
The 80% of chamber total volume；Then its internal pressure is reconciled to the intracavitary nitrogen that pours of cold source, to work as the back of control valve core lower part
When pressure is less than 1MPa, control valve, which automatically opens, flows out cold source；
2. the preparation stage in hole: cold source puts into drilling tool inner tube assembly in drilling tool outer tube after loading, and drilling tool inner tube is total
At bottom hole operating position is reached, the boss on control-rod top is seated in the concave station on drilling tool outer tube top, and drilling tool inner tube assembly is whole
Drilling tool outer tube is hung on, 2mm~4mm distance is kept between cutting tooth lower part and gas hydrates drilled strata；At this point, control
Valve jacking block processed, by control valve core dieback, the outlet of cold source chamber lower part is blocked under the action of control-rod, thus in coring process
Middle cold source will not flow out in self cooling source chamber；
3. the coring stage: after drilling tool inner tube assembly reaches operating position, turn on pump circulating fluid, drilling fluid controls certainly
The drilling fluid inlet on bar top enters in the enclosure space that drilling tool outer tube, valve body and sealing ring are formed, and valve living is pushed to move down,
Valve living moves down the anvil of hammering lower part with piston compression valve spring, generates impact force and drilling tool is driven to impact drive cutting downwards
Tooth impact enters natural gas hydrate stratum；During being moved down due to piston, valve living by valve body obstruction and stop
It moves down；Piston continues to move down under the action of inertia, and valve living is separated from each other with piston, and drilling fluid is among piston
Enter valve inner in the middle part of through-hole, enters from the inlet on anvil top and then flowed out from the liquid outlet for being located at its underpart, finally
Annular gap outflow between drilling tool inner tube assembly and drilling tool outer tube；After being contacted between piston and anvil, work of the piston in valve spring
The upper surface that valve body is gone upward under blocks the circulation canal of drilling fluid, and paddle type mill vibrates sampling mechanism and resets, and starts next time
Hammering action；Basket and core barrel are inserted into natural gas hydrate stratum by multiple hammering action, natural gas hydration
Object rock core enters in core barrel, and the spring of pulling in core barrel hinders the gas hydrates rock core obtained to drop out out of core barrel；
4. the pressure maintaining rock core stage: putting into fisher after coring, fisher is stuck in the top groove of control-rod, is above mentioned
Drilling tool, control-rod drive core barrel uplink, the whole opposing levers downlink under Gravitative Loads of drilling tool；When being advanced on core barrel
When in pressure chamber, flap valve is overturn under the action of torsional spring, and by pressure chamber's lower seal, the indoor pressure of pressure is natural at this time
The reset pressure of gas hydrate reservoir；
5. the freezing core stage: it is upper mention drilling tool during, control valve jacking block is moved down relative to control-rod, works as movement
When flushing to its lower surface with jacking block room upper surface, control valve jacking block is retracted under the downward pressure effect that control valve core is applied
In jacking block room；Pretightning force and pressure indoor pressure effect going out cold source chamber lower part of the control valve core by control valve spring at this time
Mouth is shut；When the indoor pressure of pressure is lower than 1MPa, control valve core is under the action of cold source chamber internal pressure, compression control valve
Spring opens cold source chamber, in the annular spaces between cold source injection pressure room and core barrel, by cold source by the day in core barrel
Right gas hydrate rock core is chilled to -40 DEG C hereinafter, so that gas hydrates do not decompose；
6. continuing the drilling stage: gas hydrates rock core is obtained after drilling tool inner tube assembly is mentioned to aperture, then turn on pump,
Rotary tools outer tube drives drill bit to continue the stratum being drilled down into gas hydrates rock core has been obtained；Then the above step is repeated
Suddenly continue core-drilling.
Wherein, the cold source is low temperature phase change liquid, which uses temperature for 0 DEG C~-120 DEG C of wine
The liquid nitrogen that essence-dry ice mixture, the acetone-dry ice mixture that temperature is 0 DEG C~-130 DEG C or temperature are -197 DEG C.
Through the above design, the present invention can be brought the following benefits: the present invention keeps the temperature gas hydrates
Gastight sampling technology, freezing sampling technique and paddle type mill vibration sampling technique are for the gas hydrates in non-lithology deposit
Core drilling；Guarantee the integrality of gas hydrates rock core using paddle type mill vibration sampling technique；It is sampled using heat-insulation pressure keeping
Technology ensures the stability of gas hydrates rock core；To freeze sampling technique auxiliary heat-insulation pressure keeping sampling technique, lost in pressure maintaining
When losing, gas hydrates rock core, which is chilled to -40 DEG C, by the decalescence effect of low temperature phase change liquid ensures gas water
Object is closed not decompose；In summary the gas hydrates paddle type mill refrigerating and pressure keeping double acting rope auger that present invention proposes
The coring success rate of non-lithology deposit gas hydrates can be improved in tool and method.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description explanation does not constitute improper restriction of the invention for understanding the present invention, in the accompanying drawings:
Fig. 1 is the structure of gas hydrates paddle type mill refrigerating and pressure keeping double acting rope Sampling driller in the embodiment of the present invention
Schematic diagram.
Fig. 2 is the partial enlarged view one of Fig. 1.
Fig. 3 is the partial enlarged view two of Fig. 1.
It is respectively marked in figure as follows: 1- control-rod, 2- drilling tool outer tube, 3- valve living, 4- sealing ring, 5- piston, 6- valve body, 7- valve
Spring, 8- anvil, 9- exhaust valve, 10- cavity pipe, 11- exhaust valve spring, 12- exhaust plug, 13- cold source chamber insulating layer, 14-
Control valve core, 15- control valve spring, 16- control valve jacking block, 17- jacking block room, the pressure chamber 18- insulating layer are protected on 19- flap valve
Warm layer, 20- flap valve, 21- torsional spring, 22- core barrel, 23- coring cylinder piston, 24- cutting tooth, 25- basket, 26- pull spring,
27- drill bit.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.It should be understood by those skilled in the art that.Specifically described content is illustrative and be not restrictive below, should not be with this
It limits the scope of the invention.In order to avoid obscuring essence of the invention, well known method, process, process and element are not
It is described in detail.
The present invention is to combine paddle type mill vibration sampling, gastight sampling and freezing sampling, realizes and improves non-lithology deposition
The purpose of gas hydrates rock core coring rate in object.
For the present invention using low temperature phase change liquid as cold source, low temperature phase change liquid uses temperature for 0 DEG C~-120 DEG C of wine
Essence-dry ice mixture, the acetone-dry ice mixture that temperature is 0 DEG C~-130 DEG C or temperature are that -197 DEG C of liquid nitrogen etc. being capable of gas
Change the cryogen of heat absorption；
As shown in Figure 1, Figure 2 and Figure 3, gas hydrates paddle type mill refrigerating and pressure keeping double acting rope Sampling driller, this takes
Sample drilling tool includes fisher, drilling tool outer tube 2, drilling tool inner tube assembly and drill bit 27, and drilling tool inner tube assembly is arranged in drilling tool outer tube 2
Portion, has therebetween annular gap, and the drilling working end of drilling tool outer tube 2 is arranged in drill bit 27, which is characterized in that drilling tool inner tube
Assembly includes that paddle type mill vibrates sampling mechanism, freezing by change of state mechanism, pressure holding and coring mechanism,
Wherein paddle type mill vibration sampling mechanism includes control-rod 1, valve 3, sealing ring 4, piston 5, valve body 6, valve spring 7 and iron living
Anvil 8, the groove connecting with fisher is equipped at the top of the control-rod 1, and the boss on 1 top of control-rod is seated at 2 top of drilling tool outer tube
Concave station in；The valve living 3, sealing ring 4, piston 5, valve body 6, valve spring 7 and anvil 8 be set in the outside of control-rod 1 and with control
Bar 1 processed is coaxially disposed；Valve 3 living is placed in 6 top of valve body, and the lower part of valve 3 living is contacted with piston 5；Piston 5 is located inside valve body 6, living
The diameter at 5 middle part of plug is greater than the aperture on 6 top of valve body, therefore middle part under the action of valve spring 7 of piston 5 withstands on 6 inner top of valve body；
Valve spring 7 be arranged inside valve body 6, the top of valve spring 7 is contacted with piston 5, and the lower part of valve spring 7 is contacted with anvil 8, make piston 5 and
Certain distance is kept between anvil 8；The concave ring groove for fixed valve body 6 is provided on anvil 8, it is two that anvil 8 is divided to by concave ring groove
Point, being partially disposed in valve body 6 above concave ring groove, being partially disposed in outside valve body 6 below concave ring groove, anvil 8
Bottom is connect with cavity pipe 10, and wherein 10 bottom of cavity pipe is opened type structure, and cavity pipe 10 divides for two chambers, respectively cold
Source chamber and pressure chamber, cold source chamber are located above pressure chamber；
Wherein freezing by change of state mechanism includes exhaust valve, cold source chamber and control valve, and the inner wall of cold source chamber is covered with cold source chamber guarantor
Warm layer 13 guarantees and extraneous insulation；The exhaust valve is mounted on the cold source inlet of cavity pipe 10, and exhaust valve includes exhaust valve
Body 9, exhaust valve spring 11 and exhaust plug 12, the exhaust valve 9 are connect by screw thread with cavity pipe 10；The exhaust valve bullet
Spring 11 and exhaust plug 12 are arranged inside exhaust valve 9, and one end of exhaust valve spring 11 is connect with exhaust valve 9, exhaust valve
The other end of spring 11 is connect with exhaust plug 12, and the pretightning force of exhaust valve spring 11 is used to exhaust plug 12 withstanding on exhaust valve
On the through-hole of body 9, guarantee when the intracavitary gas pressure of cold source is excessive, the intracavitary pressure of cold source is adjusted by exhaust；The control
Valve processed includes control valve core 14, control valve spring 15, control valve jacking block 16 and jacking block room 17, and the control valve spring 15 is used for will
Control valve core 14 is pressed on the outlet of cold source chamber, and the outlet of cold source chamber is shut；The control valve jacking block 16 is arranged in control-rod 1
Slideway in, and a part of control valve jacking block 16 protrudes from the lower part that control-rod 1 is resisted against control valve core 14, for that will control
Spool 14 processed locks, make control valve core 14 can not in hole the coring stage open；When 1 uplink of control-rod, control valve jacking block 16 is logical
It crosses control valve core 14 to be pressed into the jacking block room 17 positioned at 1 slide bottom of control-rod, control valve jacking block 16 is no longer control at this time
Spool 14 processed pushes up power on providing；
Wherein pressure holding includes pressure chamber, flap valve 20 and torsional spring 21, and the inner wall of pressure chamber is covered with pressure chamber
Insulating layer 18, guarantee and extraneous insulation, the fixing end of the flap valve 20 and the lower sidewall of cavity pipe 10 are hinged, and are cutting with scissors
The place of connecing is provided with torsional spring 21, and the free end of flap valve 20 is contacted with control-rod 1, is provided with and turns on the upper surface of the flap valve 20
Insulating layer 19 guarantees natural in pressure maintaining period or refrigerating process on insulating layer 19 on plate valve, pressure chamber's insulating layer 18 and flap valve
A large amount of heat exchange will not occur with the external world for gas hydrate rock core；The hinged of flap valve 20 and cavity pipe 10 is arranged in the torsional spring 21
Place, flap valve 20 is in rollover states under the effect of torsional spring 21, but due to the effect of control-rod 1, makes flap valve 20 in non-work
Make situation to push on control-rod 1；After 1 uplink of control-rod drives core barrel 22 to enter pressure chamber, flap valve 20 is in torsional spring 21
Under the action of by the lower seal of pressure chamber；
Wherein coring mechanism includes core barrel 22, coring cylinder piston 23, cutting tooth 24, basket 25 and pulls spring 26,
The basket 25 is coaxially disposed with cavity pipe 10, and the top of basket 25 is connect with cavity pipe 10, the bottom of basket 25 and
Cutting tooth 24 is connected, by paddle type mill vibrate sampling mechanism transmitting impact force, basket 25 drive cutting tooth 24 impact into
Enter natural gas hydrate stratum, obtains gas hydrates rock core；The core barrel 22 is located at 25 inside of basket and is sitting in rock
In heart pipe 25 on step, core barrel 22 is internally provided with the coring cylinder piston 23 connecting with 1 bottom of control-rod, in coring process
In, coring cylinder piston 23 moves up generation suction force auxiliary rock core relative to core barrel 22 and enters core barrel 22；It is described to pull spring
26 are fixed on 22 lower part of core barrel, so that gas hydrates rock core will not be dropped out from core barrel 22 when coring.
Gas hydrates paddle type mill refrigerating and pressure keeping double acting wire line coring method, comprising the following steps:
1. the earth's surface preparation stage: before carrying out gas hydrates coring, pressure intracavitary according to cold source first
It is self-possessed with control valve and sets the pretightning force of control valve, installation control valve core 14, control valve spring 15 and control valve jacking block 16, so that
When the back pressure of 14 lower part of control valve core is less than 1MPa, control valve, which automatically opens, makes outflow in the self cooling source chamber of cold source；Then it needs
To the intracavitary injection cold source of cold source, exhaust valve 9, exhaust valve spring 11 and exhaust plug 12 are removed from cavity pipe 10, Xiang Leng
Cold source chamber is pre-chilled in injection liquid nitrogen in source chamber, constantly injection liquid nitrogen, when the intracavitary temperature of cold source reaches -100 DEG C, explanation
Pre-cooling is had reached to require；After pre-cooling, the low temperature phase change liquid selected to the intracavitary injection of cold source, low temperature phase change liquid is made
For cold source injection rate is cold source chamber total volume 80%；Then the intracavitary nitrogen that pours of cold source reconciles pressure therein, it is ensured that works as control
When the back pressure of 14 lower part of spool processed is less than 1MPa, control valve, which automatically opens, flows out cold source.Due to cold source chamber insulating layer 13 every
Heat effect and the pre-cooling of liquid nitrogen early period, therefore after injecting cold source, cold source can be in the intracavitary long-term preservation of cold source；
2. the preparation stage in hole: cold source puts into drilling tool inner tube assembly in drilling tool outer tube 2 after loading, and drilling tool inner tube is total
At bottom hole operating position is reached, the boss on 1 top of control-rod is seated in the concave station on 2 top of drilling tool outer tube, and drilling tool inner tube assembly is whole
Body is hung on inside drilling tool outer tube 2, and 2mm~4mm distance is kept between 24 lower part of cutting tooth and gas hydrates drilled strata；This
When, control valve jacking block 16, by 14 dieback of control valve core, the outlet of cold source chamber lower part is blocked under the action of control-rod 1, thus
Cold source will not flow out in self cooling source chamber during coring；
3. the coring stage: after drilling tool inner tube assembly reaches operating position, turn on pump circulating fluid, drilling fluid controls certainly
The drilling fluid inlet on 1 top of bar enters in the enclosure space that drilling tool outer tube 2, valve body 6 and sealing ring 4 are formed, and pushes valve 3 living downwards
Mobile, valve 3 living compresses the anvil 8 that valve spring 7 moves down hammering lower part with piston 5, generates impact force and drives drilling tool to undershoot
It hits and the impact of cutting tooth 24 is driven to enter natural gas hydrate stratum；During being moved down due to piston 5, valve 3 living is by valve
The obstruction of body 6 and stop moving down；Piston 5 continues to move down under the action of inertia, and valve 3 living is separated from each other with piston 5,
Drilling fluid enters inside valve body 6 from the through-hole middle part among piston 5, enters then from the inlet on 8 top of anvil from positioned at it
The liquid outlet of lower part flows out, finally the annular gap outflow between drilling tool inner tube assembly and drilling tool outer tube 2；Piston 5 and anvil 8 it
Indirectly after touch, piston 5 goes upward to the upper surface of valve body 6 under the action of valve spring 7, blocks the circulation canal of drilling fluid, paddle type mill
It vibrates sampling mechanism to reset, starts hammering action next time；Basket 25 and core barrel 22 are inserted by multiple hammering action
Enter in natural gas hydrate stratum, gas hydrates rock core enters in core barrel 22, and the obstruction of spring 26 of pulling in core barrel 22 obtains
The gas hydrates rock core obtained is dropped out out of core barrel 22；
4. the pressure maintaining rock core stage: fisher is put into after coring, fisher is stuck in the top groove of control-rod 1, on
Drilling tool is mentioned, control-rod 1 drives 22 uplink of core barrel, whole 1 downlink of opposing levers under Gravitative Loads of drilling tool；When core barrel 22
On when being advanced into pressure chamber, flap valve 20 is overturn under the action of torsional spring 21, by pressure chamber's lower seal, at this time in pressure chamber
Pressure be gas hydrates reservoir reset pressure；
5. the freezing core stage: it is upper mention drilling tool during, control valve jacking block 16 is moved down relative to control-rod 1, when
When being moved to jacking block room 17, control valve jacking block 16 is retracted into jacking block room 17 under the downward pressure effect that control valve core 14 is applied
It is interior；Control valve core 14 is acted on by the indoor pressure of pretightning force and pressure of control valve spring 15 by the outlet of cold source chamber lower part at this time
It shuts；When the decline of 20 sealing performance of flap valve causes the indoor pressure of pressure lower than 1MPa, control valve core 14 is intracavitary in cold source
Under the action of portion's pressure, compression control valve spring 15 opens cold source chamber, the ring-type between cold source injection pressure room and core barrel 22
In gap, the gas hydrates rock core in core barrel 22 is freezed by the decalescence effect by low temperature phase change liquid
To -40 DEG C or less, it is ensured that gas hydrates do not decompose；Due on pressure chamber's inner thermal insulating layer 18 and flap valve insulating layer 19 every
Heat effect, cold source will not lose cooling capacity during freezing gas hydrates rock core；
6. continuing the drilling stage: obtaining hydrate rock core after drilling tool inner tube assembly is mentioned to aperture, then turn on pump, rotation is outer
Pipe 2 drives drill bit 27 to continue the stratum being drilled down into rock core has been obtained；Then it repeats above step and continues core-drilling.
Claims (3)
1. gas hydrates paddle type mill refrigerating and pressure keeping double acting rope Sampling driller, which includes fisher, drilling tool
Outer tube (2), drilling tool inner tube assembly and drill bit (27), the setting of drilling tool inner tube assembly is internal in drilling tool outer tube (2), has therebetween
Annular gap, drill bit (27) are arranged in the drilling working end of drilling tool outer tube (2), which is characterized in that drilling tool inner tube assembly includes hammer
Formula vibration sampling mechanism, freezing by change of state mechanism, pressure holding and coring mechanism are hit,
Wherein paddle type mill vibration sampling mechanism includes control-rod (1), valve (3), sealing ring (4), piston (5), valve body (6), valve living
Spring (7) and anvil (8), control-rod (1) top are equipped with the groove connecting with fisher, and the boss on control-rod (1) top is sat
In in the concave station on drilling tool outer tube (2) top；The valve living (3), sealing ring (4), piston (5), valve body (6), valve spring (7) and anvil
(8) it is set in control-rod (1) outside and is coaxially disposed with control-rod (1)；Valve (3) living are placed in above valve body (6), valve (3) living
Lower part contacted with piston (5)；Piston (5) is located at valve body (6) inside, and the diameter in the middle part of piston (5) is greater than valve body (6) top
Aperture；Valve spring (7) setting is internal in valve body (6), and the top of valve spring (7) is contacted with piston (5), the lower part of valve spring (7) and anvil
(8) it contacts；The concave ring groove for fixed valve body (6) is provided on anvil (8), anvil (8) are divided into two parts, be located at by concave ring groove
Being partially disposed in valve body (6) above concave ring groove is partially disposed in valve body (6) outside, the bottom of anvil (8) below concave ring groove
Portion is connect with cavity pipe (10), and wherein cavity pipe (10) bottom is opened type structure, and cavity pipe (10) is divided into two chambers, respectively
For cold source chamber and pressure chamber, cold source chamber is located above pressure chamber；
Wherein freezing by change of state mechanism includes exhaust valve, cold source chamber and control valve, is covered with cold source chamber on the inner wall of the cold source chamber
Insulating layer (13)；The exhaust valve is mounted on the cold source inlet of cavity pipe (10), and exhaust valve includes exhaust valve (9), exhaust
Valve spring (11) and exhaust plug (12), the exhaust valve (9) are connect by screw thread with cavity pipe (10)；The exhaust valve bullet
Spring (11) and exhaust plug (12) setting are internal in exhaust valve (9), and one end and exhaust valve (9) of exhaust valve spring (11) are even
It connects, the other end of exhaust valve spring (11) is connect with exhaust plug (12), and the pretightning force of exhaust valve spring (11) will be for that will be vented
Spool (12) is withstood on the through-hole of exhaust valve (9)；The control valve includes control valve core (14), control valve spring (15), control
Valve jacking block (16) processed and jacking block room (17), the control valve spring (15) are used to for control valve core (14) being pressed on going out for cold source chamber
Mouthful；The control valve jacking block (16) is arranged in the slideway of control-rod (1), and a part of control valve jacking block (16) protrudes from
Control-rod (1) is resisted against the lower part of control valve core (14), for control valve core (14) to be locked, when control-rod (1) uplink, and control
Valve jacking block (16) is pressed into the jacking block room (17) of control-rod (1) slide bottom by control valve core (14)；
Wherein pressure holding includes that pressure chamber, flap valve (20) and torsional spring (21), the inner wall of the pressure chamber are covered with pressure
Power room insulating layer (18), the fixing end of the flap valve (20) and the lower sidewall of cavity pipe (10) are hinged, and set in hinged place
It is equipped with torsional spring (21), the free end of flap valve (20) is contacted with control-rod (1), and the side of flap valve (20) towards pressure chamber is arranged
There are insulating layer on flap valve (19)；The torsional spring (21) is arranged in the hinged place of flap valve (20) and cavity pipe (10), torsional spring
(21) for driving flap valve (20) to overturn；
Wherein coring mechanism includes core barrel (22), coring cylinder piston (23), cutting tooth (24), basket (25) and pulls spring
(26), the basket (25) and cavity pipe (10) are coaxially disposed, and the top of basket (25) is connect with cavity pipe (10), rock core
The bottom of pipe (25) is connected with cutting tooth (24)；The core barrel (22) is located at basket (25) inside and is sitting in basket
(25) on interior step, core barrel (22) is internally provided with the coring cylinder piston (23) connecting with control-rod (1) bottom；It is described to pull spring
(26) it is fixed on core barrel (22) lower part, so that gas hydrates rock core will not be dropped out from core barrel (22) when coring.
2. gas hydrates paddle type mill refrigerating and pressure keeping double acting rope sampling method, which is characterized in that the sampling method uses
Gas hydrates paddle type mill refrigerating and pressure keeping double acting rope Sampling driller described in claim 1 is sampled, and is specifically included
Following steps:
1. the earth's surface preparation stage: before carrying out gas hydrates coring, intracavitary according to cold source first pressure and control
The pretightning force of valve self weight setting control valve processed, installation control valve core (14), control valve spring (15) and control valve jacking block (16) make
When the back pressure of proper control valve core (14) lower part is less than 1MPa, control valve, which automatically opens, makes outflow in the self cooling source chamber of cold source；Then
Exhaust valve (9), exhaust valve spring (11) and exhaust plug (12) are removed from cavity pipe (10), to the intracavitary injection liquid of cold source
Cold source chamber is pre-chilled in nitrogen, and the temperature in cold source intracavitary portion terminates to be pre-chilled when reaching -100 DEG C, intracavitary to cold source after pre-cooling
Cold source is injected, the injection rate of cold source is the 80% of cold source chamber total volume；Then its inside is reconciled to the intracavitary nitrogen that pours of cold source
Pressure, so that when the back pressure of control valve core (14) lower part is less than 1MPa, control valve, which automatically opens, flows out cold source；
2. the preparation stage in hole: cold source puts into drilling tool inner tube assembly in drilling tool outer tube (2) after loading, drilling tool inner tube assembly
Bottom hole operating position is reached, the boss on control-rod (1) top is seated in the concave station on drilling tool outer tube (2) top, drilling tool inner tube assembly
Integral hanging is internal in drilling tool outer tube (2), and 2mm~4mm is kept between cutting tooth (24) lower part and gas hydrates drilled strata
Distance；At this point, control valve jacking block (16) under the action of control-rod (1) by control valve core (14) dieback, by cold source chamber lower part
Outlet blocks, so that cold source will not flow out in self cooling source chamber during coring；
3. the coring stage: after drilling tool inner tube assembly reaches operating position, turn on pump circulating fluid, drilling fluid is from control-rod
(1) drilling fluid inlet on top enters in the enclosure space that drilling tool outer tube (2), valve body (6) and sealing ring (4) are formed, and pushes and lives
Valve (3) moves down, and valve (3) living move down the anvil (8) of hammering lower part with piston (5) compression valve spring (7), generates impact
Power drives drilling tool to impact drive cutting tooth (24) impact downwards into natural gas hydrate stratum；Since piston (5) moves down
During, living valve (3) by valve body (6) obstruction and stop moving down；Piston (5) continues downwards under the action of inertia
Mobile, valve (3) living are separated from each other with piston (5), and drilling fluid is internal into valve body (6) from the middle part of the intermediate through-hole of piston (5), from
Then the inlet on anvil (8) top enters to flow out from the liquid outlet for being located at its underpart, finally from drilling tool inner tube assembly and drilling tool
Annular gap outflow between outer tube (2)；After being contacted between piston (5) and anvil (8), piston (5) under the action of valve spring (7) on
Row blocks the circulation canal of drilling fluid, paddle type mill vibrates sampling mechanism and resets, and starts to hammer into shape next time to the upper surface of valve body (6)
Hit movement；Basket (25) and core barrel (22) are inserted into natural gas hydrate stratum by multiple hammering action, naturally
Gas hydrate rock core enters in core barrel (22), and pull spring (26) in core barrel (22) hinder the gas hydrates rock core obtained
It is dropped out in from core barrel (22)；
4. the pressure maintaining rock core stage: putting into fisher after coring, fisher is stuck in the top groove of control-rod (1), above mentions
Drilling tool, control-rod (1) drive core barrel (22) uplink, whole opposing levers (1) downlink under Gravitative Loads of drilling tool；Work as coring
On cylinder (22) when being advanced into pressure chamber, flap valve (20) is overturn under the action of torsional spring (21), by pressure chamber's lower seal, this
When the indoor pressure of pressure be gas hydrates reservoir reset pressure；
5. the freezing core stage: it is upper mention drilling tool during, control valve jacking block (16) is moved down relative to control-rod (1), when
When being moved to its lower surface and being flushed with jacking block room (17) upper surface, control valve jacking block (16) control valve core (14) applied to
It pushes and is retracted into jacking block room (17) under power effect；Pretightning force and pressure chamber of the control valve core (14) by control valve spring (15) at this time
The outlet of cold source chamber lower part is shut in interior pressure effect；When the indoor pressure of pressure is lower than 1MPa, control valve core (14) exists
Under the action of cold source chamber internal pressure, compression control valve spring (15) opens cold source chamber, cold source injection pressure room and core barrel
(22) in the annular spaces between, by cold source by the gas hydrates rock core in core barrel (22) be chilled to -40 DEG C hereinafter,
So that gas hydrates do not decompose；
6. continuing the drilling stage: obtaining gas hydrates rock core after drilling tool inner tube assembly is mentioned to aperture, then turn on pump, rotation
Drilling tool outer tube (2) drives drill bit (27) to continue the stratum being drilled down into gas hydrates rock core has been obtained；Then repeat with
Upper step continues core-drilling.
3. gas hydrates paddle type mill refrigerating and pressure keeping double acting rope sampling method according to claim 2, wherein institute
Stating cold source is low temperature phase change liquid, which uses temperature for 0 DEG C~-120 DEG C of alcohol-dry ice mixture, temperature
The liquid nitrogen that the acetone-dry ice mixture or temperature that degree is 0 DEG C~-130 DEG C are -197 DEG C.
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| CN201811016787.5A CN109113612B (en) | 2018-09-03 | 2018-09-03 | Hammer type freezing and pressure maintaining double-acting rope sampling drilling tool and method for natural gas hydrate |
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