CN116084915A - In-situ film-forming quality-guaranteeing coring simulation device for combustible ice while drilling - Google Patents

Abstract

The invention relates to the technical field of rock drilling, and particularly discloses a combustible ice in-situ film formation while drilling quality guarantee coring simulation device which comprises a simulation cabin, a core, a coring assembly and a control unit, wherein the simulation cabin is arranged, the core is arranged in the cavity, and the coring assembly is positioned in the cavity and moves vertically; the coring assembly comprises a coring barrel, a coring outer drill, a film forming mechanism, a sealer, a stroke piston arranged above the coring barrel and a cooling assembly; the stroke piston divides the chamber into a solution chamber for storing salting-out liquid and a hydro-cylinder chamber for storing hydraulic oil, and a solution inlet and a solution outlet are arranged on the simulation cabin. According to the invention, the real deep sea environment is simulated, the surface of the rock core can be covered with the film forming liquid in the coring process, the film forming liquid forms a solid film layer after the coring is finished, the salting-out effect is generated on the solid film layer through the salting-out liquid, the barrier property and the mechanical property are improved, the quality guarantee efficiency is improved, the loss of substances in the rock core is prevented, and the obtained rock core can truly reflect the in-situ flammable ice occurrence state.

Description

In-situ film-forming quality-guaranteeing coring simulation device for combustible ice while drilling

Technical Field

The invention relates to the technical field of rock drilling, in particular to a combustible ice in-situ film-forming quality-guaranteeing coring simulation device while drilling.

Background

The method for acquiring the substance information accurately reflecting the in-situ combustible ice sample has great scientific significance, and can provide guidance for the accurate exploration and evaluation of the combustible ice reservoir and the research on the submarine microorganism cause and migration rule of alkane. However, the existing submarine sediment coring technology does not consider taking protective measures on the rock core, the rock core is directly contacted with the external environment, the diffusion loss of substances in the pores of the rock core is difficult to avoid, the analysis result of the rock core is distorted, the original microorganisms die, and the mysterious of the submarine life science cannot be researched. Therefore, there is a need to develop a flammable ice in situ while drilling film quality guaranteeing coring technique.

Disclosure of Invention

The invention aims to solve the technical problem of providing a combustible ice in-situ while-drilling film quality guarantee coring simulation device which can realize the reconstruction of a deep sea in-situ high-pressure low-temperature environment; simulating a process of dynamically releasing film forming liquid while drilling to form a solid sealing film layer on the surface of the rock core; can effectively provide guidance for submarine resource exploration and development operation and lay a foundation for submarine sediment science and submarine biology exploration and research

The invention solves the technical problems by adopting the following solution:

the device comprises a simulation cabin provided with a cavity, a rock core arranged in the cavity and positioned at the bottom of the cavity, and a coring assembly positioned in the cavity and vertically moving; the coring assembly is positioned above the rock core;

the coring assembly comprises a coring barrel, a coring outer drill, a film forming mechanism, a sealer, a stroke piston and a cooling assembly, wherein the coring barrel is provided with an inner cavity and is coaxially arranged with a core, the coring outer drill is sleeved on the outer side of the coring barrel, the film forming mechanism is axially moved along the coring barrel and is positioned in the inner cavity, the sealer is positioned at the bottom of the inner cavity and is used for opening and closing the inner cavity, the stroke piston is arranged above the coring barrel, and the cooling assembly is used for cooling the coring barrel, the film forming mechanism and the sealer;

the stroke piston divides the chamber into a solution chamber for storing salting-out liquid and an oil cylinder chamber for storing hydraulic oil, wherein the solution chamber is positioned below the oil cylinder chamber, and a solution inlet and a solution outlet which are communicated with the solution chamber are arranged on the simulation cabin;

a film forming liquid storage cavity is formed between the film forming mechanism and the inner cavity, and film forming liquid is stored in the film forming liquid storage cavity.

Before coring, performing environment simulation and device assembly; the film forming liquid is placed in the film forming liquid storage cavity, and the coring assembly and the core are sequentially placed in the cavity; injecting seawater solution into the solution chamber through a high-pressure pump, and simulating a deep sea in-situ water environment and a high-pressure environment; controlling the temperature of the seawater solution in the solution chamber through a cooling pipeline, and simulating the in-situ low-temperature environment of the deep sea flammable ice; the core is cored through a coring outer drill, the core enters an inner cavity, in the coring process, film forming liquid wraps the outer side of the core, a cooling assembly is used for cooling a sealer, a coring barrel and a film forming mechanism, a cold source is concentrated at the center of the top and the bottom of the core, so that the film forming liquid on the top and the bottom of the core radially grows in a microscopic mode to form a solid film layer, and then the film layer grows towards the axial center along the side wall of the core until the core is completely wrapped; after the solid film layer is solidified, the salting-out liquid enters a solution chamber to replace seawater solution; ions in the salting-out liquid are gradually diffused into the membrane material to generate salting-out effect, so that the barrier property and mechanical property of the solid membrane layer are enhanced, and the quality guarantee efficiency is improved; finally, the high-performance solid sealing film layer is simulated and generated in the low-temperature and high-pressure water environment of deep sea reconstruction, and the original material information in the core is preserved for a long time.

In some possible embodiments, coring is to be achieved efficiently;

the coring outer drill comprises an outer cylinder sleeved on the outer side of the coring barrel and a drill bit connected with the outer cylinder and positioned at the bottom of the sealer.

In some possible embodiments, in order to effectively realize film formation while drilling, the core is coated in the inner cavity during the coring process;

the film forming mechanism comprises a liquid discharging piston sleeved in the inner cavity and provided with a liquid discharging channel, and a center rod coaxially arranged with the coring barrel and one end of which is connected with the liquid discharging piston; the other end of the central rod sequentially passes through the coring barrel, the coring outer drill, the forming piston and the simulation cabin;

and the central rod is provided with a drainage channel communicated with the drainage channel.

Furthermore, the outer side surface of the liquid discharge piston always keeps contact with the inner side surface of the coring barrel, so that the film forming liquid cannot flow out of a small gap formed between the liquid discharge piston and the coring barrel, and can only be conveyed through the liquid discharge channel;

further, the core drill is provided with a drill hole which is coaxial with the inner cavity and is positioned at the bottom of the inner cavity, and when the core drill is used for core drilling, the core passes through the drill hole and the sealer to enter the inner cavity;

in some possible embodiments, in order to effectively realize cooling of the sealer, the coring barrel and the film forming mechanism, the film layer on the surface of the core is further processed to form a solid film layer;

the cooling component comprises a first cooling component arranged on the coring outer drill and a second cooling component which is arranged on the center rod and matched with the first cooling component for use;

the first cooling component comprises a cold source runner arranged on the outer barrel, a cold source heat absorption cavity arranged between one side of the outer barrel and the core drill and communicated with the cold source runner, and a liquid cold source;

the second cooling component comprises a liquid flow passage which is axially arranged along the central rod and communicated with the cold source flow passage after coring is completed.

In some possible embodiments, in order to achieve the transport and storage of the liquid cold source;

the cold source runner comprises a liquid inlet runner and a liquid outlet runner which are respectively connected with the cold source heat absorption cavity; the cold source heat absorption cavity is annular and sleeved on the outer side of the core barrel;

the liquid flow channels are two groups, one group is communicated with one end of the liquid inlet flow channel, which is far away from the cold source heat absorption cavity, and the other group is communicated with one end of the liquid outlet flow channel, which is far away from the cold source heat absorption cavity.

In some possible embodiments, to avoid heat transfer between the outer barrel and the core barrel during the core;

a heat insulation layer is arranged between the outer cylinder and the coring cylinder; the heat insulation layer comprises two heat insulation lining layers sleeved on the outer side of the coring barrel and a vacuum layer positioned between the two heat insulation lining layers.

In some of the possible embodiments of the present invention,

a heat conducting layer is arranged on one side of the liquid draining piston, which is far away from the central rod; and the heat conducting layer is provided with a through hole communicated with the liquid discharge channel.

In some possible embodiments, in order to make the film forming liquid flow out of the liquid discharge channel only after passing through the liquid discharge channel;

a one-way valve is arranged in the liquid discharge channel; the sealer comprises a plurality of groups of sealing petals which are the same in structure and are respectively hinged with the bottom of the coring barrel, and the sealing petals are made of spring steel.

In some possible embodiments, in order to effectively simulate a deep sea real environment;

the simulation cabin comprises a film-forming simulation cabin body and a simulation cabin top cover which is arranged on the film-forming simulation cabin body and forms a cavity; a hydraulic oil inlet communicated with the oil cylinder chamber is formed in the simulated cabin top cover; and a cooling pipeline is sleeved on the outer side of the film-forming simulation cabin body.

In some of the possible embodiments of the present invention,

the liquid cold source is any one of liquid nitrogen and low-temperature alcohol;

the film forming liquid is any one or more of polyvinyl alcohol, gelatin, chitosan, sodium alginate and polyacrylamide;

or, the film forming liquid is formed by mixing any one or more of polyvinyl alcohol, gelatin, chitosan, sodium alginate and polyacrylamide with any one of calcium chloride, magnesium chloride, calcium nitrate, magnesium nitrate, lithium chloride and lithium nitrate;

the salting-out solution is a solution formed by mixing sodium citrate, sodium sulfate, potassium sulfate, sodium carbonate, potassium carbonate and sodium chloride.

The salting-out solution is a high-concentration solution formed by mixing sodium citrate, sodium sulfate, potassium sulfate, sodium carbonate, potassium carbonate and sodium chloride.

Compared with the prior art, the invention has the beneficial effects that:

the invention performs coring in the simulation cabin which can simulate the deep sea high pressure, in-situ water environment and the flammable ice original position low temperature environment through the coring component; in the coring process, the outer surface of the core is coated by a film forming mechanism, and after the coring is finished, the bottoms of the coring barrel, the sealer and the film forming mechanism are cooled by a cooling component, so that film forming liquid on the surface of the core reacts to form a solid film layer, and the core is effectively protected;

according to the invention, the salting-out liquid is adopted to replace the seawater solution, so that the solid film layer has a salting-out effect, the barrier property and the mechanical property of the solid film layer are enhanced, the quality guarantee efficiency is improved, the loss of substances in the core is prevented, the obtained core can truly reflect the in-situ flammable ice occurrence state, guidance can be provided for submarine resource exploration and development operation, and a foundation is laid for submarine sediment science and submarine biology exploration and research; finally, the high-performance solid sealing film layer is simulated and generated in the low-temperature and high-pressure water environment of deep sea reconstruction, and the original material information in the core is preserved for a long time;

the invention has simple structure and strong practicability.

Drawings

FIG. 1 is a schematic view of the structure of the present invention before coring;

FIG. 2 is a schematic diagram of the structure of the present invention when coring is performed;

FIG. 3 is a schematic diagram of the structure of the present invention after the coring operation;

FIG. 4 is an enlarged schematic view of FIG. 3 at A;

FIG. 5 is an enlarged schematic view at B in FIG. 3;

FIG. 6 is an enlarged schematic view of FIG. 3 at C;

wherein: 1. a core is drilled outside; 2. a cold source liquid channel; 3. a thermal insulation layer; 4. a vacuum layer; 5. a core barrel; 6. a central rod; 7. a film forming liquid storage chamber; 8. a one-way valve; 9. a liquid discharge piston; 10. a cold source heat absorption cavity; 11. a sealer; 12. a drain passage; 13. core; 14. a top film forming space; 15. a side film forming space; 16. a bottom film forming space; 17. a heat conducting layer; 8. a hydraulic oil inlet; 19. a solution inlet; 20. a solution outlet; 21. a stroke piston; 22. a liquid flow channel; 23. a cooling pipeline; 24. a base; 25. a solution chamber; 26. an oil cylinder chamber; 27. simulating a cabin top cover; 28. film forming simulation cabin; 29. and a coring assembly.

Detailed Description

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. Reference to "first," "second," and similar terms in this application does not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. In the implementation of the present application, "and/or" describes an association relationship of an association object, which means that there may be three relationships, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" means two or more. For example, a plurality of positioning posts refers to two or more positioning posts. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The present invention will be described in detail below.

As shown in fig. 1-6:

the in-situ film formation while drilling quality guarantee coring simulation device for the combustible ice comprises a simulation cabin provided with a cavity, a core 13 arranged in the cavity and positioned at the bottom of the cavity, and a coring assembly 29 positioned in the cavity and vertically moving; the coring assembly 29 is located above the core 13;

the coring assembly 29 comprises a coring barrel 5 provided with an inner cavity and coaxially arranged with the core 13, a coring outer drill 1 sleeved outside the coring barrel 5, a film forming mechanism axially moving along the coring barrel 5 and positioned in the inner cavity, a sealer 11 positioned at the bottom of the inner cavity and used for opening and closing the inner cavity, a stroke piston 21 arranged above the coring barrel 5, and a cooling assembly for cooling the coring barrel 5, the film forming mechanism and the sealer 11;

the stroke piston 21 divides the chamber into a solution chamber 25 for storing salting-out liquid and a hydro-cylinder chamber 26 for storing hydraulic oil, wherein the solution chamber 25 is positioned below the hydro-cylinder chamber 26, and a solution inlet 19 and a solution outlet 20 which are communicated with the solution chamber 25 are arranged on the simulation cabin;

preferably, the solution outlet 20 is arranged above the solution inlet 19;

a film forming liquid storage cavity 7 is formed between the film forming mechanism and the inner cavity, and film forming liquid is stored in the film forming liquid storage cavity 7.

Before coring, performing environment simulation and device assembly; the film forming liquid is placed in the film forming liquid storage cavity 7, and the coring assembly 29 and the core 13 are placed in the cavity in sequence; injecting seawater solution into the solution chamber 25 through a high-pressure pump to simulate a deep sea in-situ water environment and a high-pressure environment; controlling the temperature of the seawater solution in the solution chamber 25, and simulating the in-situ low-temperature environment of the deep sea flammable ice;

during coring, the coring outer drill 1 moves downwards to drill; the film forming mechanism and the coring barrel 5 move relatively along the axial direction, the volume of the film forming liquid storage cavity 7 is reduced, and the film forming liquid releases the in-situ displacement seawater solution and coats the core 13 entering the inner cavity; when coring is finished, the core 13 is completely positioned in the inner cavity, and the sealer 11 seals the bottom opening of the inner cavity;

in the coring process, a top film forming space 14 is formed between the film forming mechanism and the top of the core 13, a side film forming space 15 is formed between the side surface of the core 13 and the inner side of the coring barrel 5, a bottom film forming space 16 is formed between the bottom surface of the core 13 and the top surface of the sealer 11, film forming liquid fills the film forming space formed in the coring process and forms a film layer to cover the surface of the core 13, and all the surfaces of the core 13 form a film layer after the coring is finished;

after coring is completed, the cooling component cools the sealer 11, the coring barrel 5 and the heat conducting layer 17, and the film layer on the surface of the core 13 directionally and microscopically grows through cooling to form a solid film layer parallel to each surface of the core 13;

after the solidification of the solid film layer is completed, the salting-out liquid enters the solution chamber 25 to replace the seawater solution; ions in the salting-out liquid are gradually diffused into the membrane material to generate salting-out effect, so that the barrier property and mechanical property of the membrane-forming liquid are enhanced, and the quality guarantee efficiency is improved; finally, the high-performance solid sealing film layer is simulated and generated in the low-temperature and high-pressure water environment of deep sea reconstruction, and the original material information of the core 13 is preserved for a long time.

Further, a pedestal 24 for supporting the core 13 is disposed in the chamber.

In some of the possible embodiments of the present invention,

the coring outer drill 1 comprises an outer barrel sleeved on the outer side of the coring barrel 5 and a drill bit connected with the outer barrel and positioned at the bottom of the sealer 11.

In some possible embodiments, in order to effectively realize film formation while drilling, the core 13 is coated in the inner cavity during the coring process;

the film forming mechanism comprises a liquid discharging piston 9 sleeved in the inner cavity and provided with a liquid discharging channel, and a center rod 6 coaxially arranged with the coring barrel 5 and one end of which is connected with the liquid discharging piston 9; the other end of the center rod 6 sequentially passes through the coring barrel 5, the coring outer drill 1 and forms a piston and a simulation cabin;

the center rod 6 is provided with a drain passage 12 communicating with the drain passage.

In some possible embodiments, in order to effectively realize cooling of the sealer 11, the coring barrel 5 and the film forming mechanism, further realize processing of the film layer on the surface of the core 13 to form a solid film layer;

the cooling component comprises a first cooling component arranged on the core drill 1 and a second cooling component which is arranged on the center rod 6 and matched with the first cooling component for use;

the first cooling component comprises a cold source runner 2 arranged on the outer barrel, a cold source heat absorption cavity 10 arranged between the outer barrel and one side of the core drill 1 and communicated with the cold source runner 2, and a liquid cold source;

the second cooling component comprises a liquid flow passage 22 which is arranged along the axial direction of the central rod 6 and is communicated with the cold source flow passage 2 after coring is completed.

In some possible embodiments, in order to achieve the transport and storage of the liquid cold source;

the cold source runner 2 comprises a liquid inlet runner and a liquid outlet runner which are respectively connected with the cold source heat absorption cavity 10; the cold source heat absorption cavity 10 is annular and sleeved on the outer side of the core barrel 5;

the liquid flow channels 22 are two groups, one group is communicated with one end of the liquid inlet flow channel far away from the cold source heat absorption cavity 10, and the other group is communicated with one end of the liquid outlet flow channel far away from the cold source heat absorption cavity 10.

In the process of coring, the center rod 6 is stationary, the coring outer drill 1 moves downwards, and when the coring is finished, two groups of liquid flow channels arranged on the center rod 6 are respectively communicated with the liquid inlet flow channel and the liquid outlet flow channel; the liquid cold source can be injected into the cold source heat absorption cavity 10 through the liquid flow channel 22 communicated with the liquid inlet flow channel, so that the liquid cold source respectively exchanges heat with the sealer 11, the coring barrel 5 and the film forming mechanism in the cold source heat absorption cavity 10 to absorb heat; therefore, the film layer covered on the surface of the core 13 in the coring process can be solidified into a solid film layer, and the core 13 is effectively protected;

in some possible embodiments, to avoid heat transfer between the outer barrel and the core barrel 5 during the core-taking process;

a heat insulation layer 3 is arranged between the outer cylinder and the coring cylinder 5; the heat insulation layer 3 comprises two heat insulation lining layers sleeved on the outer side of the coring barrel 5 and a vacuum layer 4 positioned between the two heat insulation lining layers.

Preferably, the heat insulation layer 3 is made of any one of polytetrafluoroethylene, a foaming ceramic plate, a vacuum micro-bead composite material and a vacuum heat insulation plate;

further, the heat insulation layer 3 comprises two heat insulation lining layers sleeved on the outer side of the core barrel 5, and a vacuum layer 4 positioned between the two heat insulation lining layers.

In some of the possible embodiments of the present invention,

a heat conducting layer 17 is arranged on one side of the liquid draining piston 9 away from the central rod 6; the heat conducting layer 17 is provided with a through hole communicated with the liquid discharging channel.

The purpose of setting up heat conduction layer 17 is, when liquid cold source is to the section of thick bamboo 5 of taking a core 5 cooling, and the section of thick bamboo 5 of taking a core wholly will be cooled down, heat conduction layer 17 and the cooperation of taking a core 5 contact to make heat conduction layer 17 can be along its and the section of thick bamboo 5 of taking a core vertically direction cooling, wherein outside temperature will be less than its central temperature, finally makes the film forming liquid that forms between core 13 top and the heat conduction layer 17 bottom can take the directional microscopic growth of radial form solid film layer.

Preferably, the heat conducting layer 17 is made of a metal material, so that temperature change can be effectively guaranteed.

In some possible embodiments, in order to make the film forming liquid flow out of the liquid discharge channel only after passing through the liquid discharge channel 12;

a one-way valve 8 is arranged in the liquid discharge channel; the sealer 11 comprises a plurality of groups of sealing flaps which are the same in structure and are respectively hinged with the bottom of the coring barrel 5, and the sealing flaps are made of spring steel.

When coring is performed, the one-way valve 8 is opened, and film forming liquid at the upper part of the liquid discharge piston 9 passes through the liquid discharge channel 12 and sequentially passes through the liquid discharge channel and the through hole to be discharged and flows to the side surface of the core 13, so that film is formed on the surface of the core 13; after the coring is finished, the whole core 13 is positioned in the inner cavity, the sealer 11 seals the bottom of the inner cavity, the film forming liquid is placed to leak, and at the moment, the film forming liquid flows into the space between the bottom of the core 13 and the sealer 11 to form a film on the bottom of the core 13, so that the core 13 is protected by wrapping a layer of film forming liquid on the outer side surface of the core 13.

In some possible embodiments, in order to effectively simulate a deep sea real environment;

the simulation cabin comprises a film-forming simulation cabin body 28 and a simulation cabin top cover 27 which is arranged on the film-forming simulation cabin body 28 and forms a cavity; a hydraulic oil inlet 18 communicated with the oil cylinder chamber 26 is arranged on the simulated cabin top cover 27; the outside of the film forming simulation cabin 28 is sleeved with a cooling pipeline 23.

Hydraulic oil enters the oil cylinder chamber 26 through the hydraulic oil inlet 18, and applies acting force to the stroke piston 21, so that the coring outer drill 1 is driven to move downwards to realize coring;

further, the cooling pipeline 23 is filled with a liquid cold source, and the cooling simulation of the seawater solution in the solution chamber 25 is realized by the liquid cold source;

preferably, the cooling pipe 23 is spirally wound on the outside of the film formation simulation capsule 28.

In some of the possible embodiments of the present invention,

the liquid cold source is any one of liquid nitrogen and low-temperature alcohol; the material is adopted as a liquid cold source to effectively realize cooling;

the film forming liquid is one or more of polyvinyl alcohol, gelatin, chitosan, sodium alginate and polyacrylamide;

or, the film forming liquid is formed by mixing any one or more of polyvinyl alcohol, gelatin, chitosan, sodium alginate and polyacrylamide with any one of calcium chloride, magnesium chloride, calcium nitrate, magnesium nitrate, lithium chloride and lithium nitrate; for example, a mixed solution of polyvinyl alcohol and magnesium chloride, a mixed solution of sodium alginate, polyacrylamide, magnesium nitrate and lithium chloride, and the like can be used.

The film forming liquid formed by the solution can generate physical and chemical changes in a low-temperature environment, and the film forming liquid is microscopically arrayed and grows along the direction of temperature gradient to form a high polymer solution of a solid quality guarantee film layer; perpendicular to the microscopic growth direction of the film material, has the optimal material barrier property for volatile materials; parallel to the microscopic growth direction of the film material, so that the film material has optimal tensile strength.

The salting-out solution is a solution formed by mixing sodium citrate, sodium sulfate, potassium sulfate, sodium carbonate, potassium carbonate and sodium chloride; ions in the salting-out solution are gradually diffused into the membrane material to generate salting-out effect, so that the barrier property and mechanical property of the cured membrane layer are enhanced, and the quality guarantee efficiency is improved.

The specific implementation method of the invention comprises the following steps:

before coring:

the film forming liquid is preset in the film forming liquid storage, and the coring assembly 29 and the core 13 are placed into the film forming simulation cabin 28; firstly, a high-pressure pump is adopted to pump seawater into the solution chamber 25 through the solution inlet 19, air is discharged from the solution outlet 20, the coring assembly 29 is soaked in the seawater, and the deep sea in-situ water environment is simulated. The use of the high-pressure pump increases the pressure in the solution chamber 25 to simulate the deep sea high-pressure environment; the temperature of the seawater solution in the solution chamber 25 is controlled by circulating cold source liquid such as liquid nitrogen, low-temperature alcohol and the like in the cooling pipeline 23, so as to simulate the in-situ low-temperature environment of the deep sea flammable ice.

During coring, the following steps are adopted:

the top end of the central rod 6 is externally connected with a pulling machine and is kept static; pumping hydraulic oil into the oil cylinder chamber 26 through the hydraulic oil inlet 18 to push the coring drilling to move the coring bit 13 downwards; the center rod 6 and the coring barrel 5 generate relative motion, so that the volume of the film forming liquid storage cavity 7 is reduced; gradually releasing film forming liquid into the coring barrel 5 through the drainage channel 12 and the one-way valve 8 along with the coring drilling process, and displacing seawater solution in situ to cover the surface of the core 13 positioned in the inner cavity; in the process that the core 13 enters the coring barrel 5, the sealing valve in the sealer 11 automatically attaches the core 13 and opens, so that the core 13 is coaxial with the inner cavity, and simultaneously the bottom of the inner cavity is sealed to prevent a large amount of film forming liquid from leaking.

After the core is taken out,

after the core 13 completely enters the coring barrel 5, the sealer 11 automatically rebounds under the elastic acting force of the sealer to seal the bottom of the coring barrel 5, prevent the film forming liquid at the bottom of the core 13 from leaking, and ensure the complete film forming sealing of the bottom of the core 13. The top surface heat conducting lining layer of the core 13 forms a top film forming space 14, the side surface of the core 13 and the inner wall of the coring barrel 5 form a side film forming space 15, the bottom surface of the core 13 and the bottom sealer 11 form a bottom film forming space 16, and film forming spaces are all completely filled with film forming liquid.

After the center rod 6 is abutted against the top of the core barrel 5, the liquid flow passage 22 of the center rod 6 is communicated with the cold source flow passage 2 in a matched mode. Liquid nitrogen or low-temperature alcohol is pumped into the liquid flow passage 22 which is communicated with the liquid inlet flow passage in one of the central rods 6 from the outside, and the liquid nitrogen or the low-temperature alcohol circularly flows in the two groups of liquid flow passages 22, the cold source flow passage 2 and the cold source heat absorption cavity 10 of the central rod 6. The liquid cold source is in contact with the outer wall of the sealer 11 and the bottom of the coring barrel 5 in the cold source heat absorption cavity 10, and reduces the temperatures of the sealer 11, the coring barrel 5 and the heat conduction lining layer, so that the film forming liquid gradually undergoes a phase change reaction to form a solid film layer;

after the film forming liquid is completely solidified, the salting-out liquid is pumped into the solution chamber 25 from the solution inlet 19 to replace the seawater solution, and the seawater solution is discharged from the solution outlet 20 above; ions in the rated salting-out solution in the solution chamber 25 are gradually diffused into the solid film layer, and a salting-out effect is generated, so that the barrier property and the mechanical property of the solid film layer are enhanced, and the quality guarantee efficiency is improved. Finally, the high-performance solid sealing film layer is simulated and generated in the low-temperature and high-pressure water environment of deep sea reconstruction, and the original material information of the core 13 is preserved for a long time.

The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.

Claims (10)

1. The device is characterized by comprising a simulation cabin provided with a cavity, a core arranged in the cavity and positioned at the bottom of the cavity, and a coring assembly positioned in the cavity and vertically moving; the coring assembly is positioned above the rock core;

the coring assembly comprises a coring barrel, a coring outer drill, a film forming mechanism, a sealer, a stroke piston and a cooling assembly, wherein the coring barrel is provided with an inner cavity and is coaxially arranged with a core, the coring outer drill is sleeved on the outer side of the coring barrel, the film forming mechanism is axially moved along the coring barrel and is positioned in the inner cavity, the sealer is positioned at the bottom of the inner cavity and is used for opening and closing the inner cavity, the stroke piston is arranged above the coring barrel, and the cooling assembly is used for cooling the coring barrel, the film forming mechanism and the sealer;

the stroke piston divides the chamber into a solution chamber for storing salting-out liquid and an oil cylinder chamber for storing hydraulic oil, wherein the solution chamber is positioned below the oil cylinder chamber, and a solution inlet and a solution outlet which are communicated with the solution chamber are arranged on the simulation cabin;

a film forming liquid storage cavity is formed between the film forming mechanism and the inner cavity, and film forming liquid is stored in the film forming liquid storage cavity.

2. The in-situ film-forming, quality-guaranteeing and coring simulation device for the combustible ice according to claim 1, wherein the coring outer drill comprises an outer barrel sleeved outside the coring barrel and a drill bit connected with the outer barrel and positioned at the bottom of the sealer.

3. The in-situ film formation while drilling and quality guarantee coring simulation device of claim 2, wherein the film forming mechanism comprises a liquid discharge piston sleeved in the inner cavity and provided with a liquid discharge channel, and a center rod coaxially arranged with the coring barrel and connected with the liquid discharge piston at one end; the other end of the central rod sequentially passes through the coring barrel, the coring outer drill, the forming piston and the simulation cabin;

and the central rod is provided with a drainage channel communicated with the drainage channel.

4. The in-situ film formation while drilling and quality guarantee coring simulation device of claim 3, wherein the cooling assembly comprises a first cooling assembly arranged on the coring outer drill and a second cooling assembly arranged on the center rod and used with the first cooling assembly;

the first cooling component comprises a cold source runner arranged on the outer barrel, a cold source heat absorption cavity arranged between one side of the outer barrel and the core drill and communicated with the cold source runner, and a liquid cold source;

the second cooling component comprises a liquid flow passage which is axially arranged along the central rod and communicated with the cold source flow passage after coring is completed.

5. The in-situ film-forming quality-guaranteeing coring simulation device with the while-drilling combustible ice of claim 4, wherein the cold source runner comprises a liquid inlet runner and a liquid outlet runner which are respectively connected with the cold source heat absorption cavity; the cold source heat absorption cavity is annular and sleeved on the outer side of the core barrel;

the liquid flow channels are two groups, one group is communicated with one end of the liquid inlet flow channel, which is far away from the cold source heat absorption cavity, and the other group is communicated with one end of the liquid outlet flow channel, which is far away from the cold source heat absorption cavity.

6. A combustible ice in-situ film formation while drilling quality assurance coring simulation device according to claim 3, wherein a heat insulation layer is arranged between the outer barrel and the coring barrel; the heat insulation layer comprises two heat insulation lining layers sleeved on the outer side of the coring barrel and a vacuum layer positioned between the two heat insulation lining layers.

7. The in-situ film formation while drilling and quality guaranteeing coring simulation device of claim 6, wherein a heat conducting layer is arranged on one side of the liquid draining piston away from the center rod; and the heat conducting layer is provided with a through hole communicated with the liquid discharge channel.

8. A combustible ice in-situ film formation while drilling quality assurance coring simulation device according to claim 3, wherein a one-way valve is arranged in the liquid discharge channel; the sealer comprises a plurality of groups of sealing petals which are the same in structure and are respectively hinged with the bottom of the coring barrel, and the sealing petals are made of spring steel.

9. The in-situ while-drilling film-formation, quality-guaranteeing and coring simulation device for a combustible ice according to any one of claims 1 to 8, wherein the simulation cabin comprises a film-formation simulation cabin body and a simulation cabin top cover which is arranged on the film-formation simulation cabin body and forms a cavity; a hydraulic oil inlet communicated with the oil cylinder chamber is formed in the simulated cabin top cover; and a cooling pipeline is sleeved on the outer side of the film-forming simulation cabin body.

10. The in-situ film formation while drilling and quality guarantee coring simulation device of claim 4, wherein the device comprises a plurality of sensors,

the liquid cold source is any one of liquid nitrogen and low-temperature alcohol;

the film forming liquid is any one or more of polyvinyl alcohol, gelatin, chitosan, sodium alginate and polyacrylamide;

or, the film forming liquid is formed by mixing any one or more of polyvinyl alcohol, gelatin, chitosan, sodium alginate and polyacrylamide with any one of calcium chloride, magnesium chloride, calcium nitrate, magnesium nitrate, lithium chloride and lithium nitrate;

the salting-out solution is a solution formed by mixing sodium citrate, sodium sulfate, potassium sulfate, sodium carbonate, potassium carbonate and sodium chloride.

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