阅读说明：本技术 一种基于冷源的保温保压取芯器以及取芯方法 (Heat-preservation and pressure-maintaining coring device based on cold source and coring method ) 是由 谢和平 高明忠 陈领 吴年汉 李聪 李佳南 何志强 胡云起 杨建平 于 2021-08-12 设计创作，主要内容包括：本发明公开了一种基于冷源的保温保压取芯器以及取芯方法,其中,所述基于冷源的保温保压取芯器包括取芯机构和套管机构,所述套设机构上设有中空管道,所述取芯机构安装在所述中空管道内；所述套管机构包括沿所述取芯机构的轴向方向依次连接的控制部件、保温部件和保压部件。本申请的取芯器在使用过程中将取出的样品储存到中空管道内,然后通过套管机构内的稳定环境,使样品在取出和运输的过程中维持取芯时最初的温度和压强,实现保温保压取芯。(The invention discloses a heat-preservation and pressure-maintaining coring device based on a cold source and a coring method, wherein the heat-preservation and pressure-maintaining coring device based on the cold source comprises a coring mechanism and a sleeve mechanism, a hollow pipeline is arranged on the sleeve mechanism, and the coring mechanism is arranged in the hollow pipeline; the sleeve mechanism comprises a control component, a heat preservation component and a pressure maintaining component which are sequentially connected along the axial direction of the core taking mechanism. The coring device of this application stores the sample of taking out in the hollow pipeline in the use, then through the stable environment in the sleeve pipe mechanism, makes the sample maintain the initial temperature and pressure when coring with the in-process of transportation, realizes heat preservation pressurize and coring.)

1. A heat-preservation and pressure-maintaining coring device based on a cold source is characterized by comprising a coring mechanism and a casing mechanism, wherein a hollow pipeline is arranged on the casing mechanism, and the coring mechanism is arranged in the hollow pipeline;

the sleeve mechanism comprises a control component, a heat preservation component and a pressure maintaining component which are sequentially connected along the axial direction of the core taking mechanism.

2. The heat-preservation and pressure-maintaining coring device based on the cold source as claimed in claim 1, wherein the control means comprises:

the first pipe sleeve is connected with one end, away from the pressure maintaining component, of the heat preservation component, and the core taking mechanism is installed in an inner cavity of the first pipe sleeve;

the flow control valve is arranged on the inner wall of the first pipe sleeve and is positioned at one end of the first pipe sleeve, which is far away from the heat preservation part, and the flow control valve is used for controlling the movement of the core taking mechanism; and

and the elastic clamping structure is arranged on the outer wall of the first pipe sleeve and used for fixing the first pipe sleeve.

3. The heat-preservation and pressure-maintaining coring device based on the cold source as claimed in claim 1, wherein the heat-preservation component comprises:

one end of the second pipe sleeve is connected with the control component, and the other end of the second pipe sleeve is connected with the pressure maintaining component;

the heat preservation pipe sleeve is arranged on the inner wall of the second pipe sleeve;

the core taking mechanism is arranged in an inner cavity of the lining pipe sleeve, and a storage cavity is arranged between the lining pipe sleeve and the heat preservation pipe sleeve; and

a cold source layer disposed within the storage cavity.

4. The heat-preserving and pressure-maintaining coring device based on the cold source as claimed in claim 3, wherein the cold source layer comprises at least one of a liquid nitrogen layer, a low temperature alcohol layer, a mixed layer of liquid nitrogen and low temperature alcohol.

5. The heat-preserving and pressure-maintaining coring device based on the cold source as claimed in claim 1, wherein the pressure-maintaining component comprises:

the core taking mechanism is arranged in an inner cavity of the third pipe sleeve; and

and the pressure retaining valve is arranged on the inner wall of the third pipe sleeve and is positioned at one end of the third pipe sleeve, which deviates from the heat preservation component, and the pressure retaining valve is used for controlling the opening and closing of the inner cavity of the pressure retaining component.

6. The heat-preserving and pressure-maintaining coring device based on the cold source as claimed in claim 5, wherein the pressure-maintaining valve comprises a valve seat mounted on an inner wall of the third pipe sleeve and a valve cover fixed on a side of the valve seat facing the heat-preserving member, the valve cover being rotatable on the valve seat for opening or closing an inner cavity of the third pipe sleeve.

7. The heat-preservation and pressure-maintaining coring device based on the cold source as claimed in claim 1, further comprising a coring bit installed at an end of the pressure-maintaining component away from the heat-preservation component.

8. The heat-preservation and pressure-maintaining coring device based on the cold source as claimed in claim 1, wherein the control component is detachably connected with the heat-preservation component; and/or the heat preservation component is detachably connected with the pressure maintaining component.

9. A coring method of a heat preservation and pressure maintaining coring device based on a cold source, which is characterized in that the heat preservation and pressure maintaining coring device based on the cold source of any one of claims 1 to 8 is used for coring.

10. The coring method of the heat-preservation and pressure-maintaining coring device based on the cold source as claimed in claim 9, comprising:

opening the control component and the pressure maintaining component, extending the core taking mechanism out of the sleeve mechanism, and rotating the core taking mechanism to obtain a sample;

withdrawing the core taking mechanism into the casing mechanism, and moving the sample into a hollow pipeline of the casing mechanism;

and closing the pressure maintaining part to finish coring.

Technical Field

The invention relates to the technical field of coring devices, in particular to a heat-preservation and pressure-maintaining coring device based on a cold source and a coring method.

Background

At present, Natural Gas Hydrate (also called combustible ice) is used as clean energy with shallow distribution, wide distribution, huge total amount and high energy density, is a main alternative energy in the future, and is closely concerned by governments and scientific circles of all countries in the world. The combustible ice is usually found in deep sea sediments or land permafrost, the storage layer of the combustible ice is very complex in accumulation mechanism and geological background and greatly influenced by environmental factors, and the in-situ temperature and the in-situ pressure of the combustible ice in nature are different from those of the ground surface environment. Coring operation is a necessary means for stratum exploration, is the most direct and effective means for acquiring stratum information and geological data, and a pressure-maintaining coring device is usually adopted for pressure-maintaining sampling in the combustible ice coring operation so as to obtain a combustible ice sample.

However, because the pressure-holding coring device can only maintain the pressure of the closed space for storing the sample, and the natural gas hydrate is formed under the conditions of high pressure and low temperature, the shape and the characteristics of the sample can be changed when the sample is moved to the positions with different temperatures and different pressures in the coring process, so that the conventional pressure-holding coring device cannot maintain the initial temperature and the pressure of the taken sample, and the subsequent continuous research on the sample can be influenced.

Accordingly, the prior art is yet to be improved and developed.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a heat preservation and pressure maintaining coring device based on a cold source and a coring method, and aims to solve the problem that the initial temperature and pressure cannot be maintained in the coring process so as to influence the subsequent research on samples.

The technical scheme of the invention is as follows:

a heat-preservation and pressure-maintaining coring device based on a cold source comprises a coring mechanism and a casing mechanism, wherein a hollow pipeline is arranged on the casing mechanism, and the coring mechanism is arranged in the hollow pipeline; the sleeve mechanism comprises a control component, a heat preservation component and a pressure maintaining component which are sequentially connected along the axial direction of the core taking mechanism.

The heat-preservation and pressure-maintaining coring device based on the cold source comprises a control component, a core extraction mechanism and a core extraction mechanism, wherein the control component comprises a first pipe sleeve, a flow control valve and a spring clip structure, the first pipe sleeve is connected with one end, away from the pressure-maintaining component, of the heat-preservation component, and the core extraction mechanism is installed in an inner cavity of the first pipe sleeve; the flow control valve is arranged on the inner wall of the first pipe sleeve and is positioned at one end of the first pipe sleeve, which is far away from the heat preservation part, and the flow control valve is used for controlling the movement of the core taking mechanism; the elastic clamping structure is arranged on the outer wall of the first pipe sleeve and used for fixing the first pipe sleeve.

The heat-preservation and pressure-maintaining coring device based on the cold source comprises a heat-preservation component, a control component and a cold source layer, wherein the heat-preservation component comprises a second pipe sleeve, a heat-preservation pipe sleeve, a liner pipe sleeve and a cold source layer; the heat-preservation pipe sleeve is sleeved on the inner wall of the second pipe sleeve; the inner lining pipe sleeve is arranged on the inner wall of the heat-insulation pipe sleeve, the core-taking mechanism is arranged in an inner cavity of the inner lining pipe sleeve, and a storage cavity is arranged between the inner lining pipe sleeve and the heat-insulation pipe sleeve; the cold source layer is disposed within the storage cavity.

The heat-preservation and pressure-maintaining coring device based on the cold source comprises at least one of a liquid nitrogen layer, a low-temperature alcohol layer and a mixed layer of liquid nitrogen and low-temperature alcohol.

The heat-preservation and pressure-maintaining coring device based on the cold source comprises a pressure-maintaining component, a core-taking mechanism and a control component, wherein the pressure-maintaining component comprises a third pipe sleeve and a pressure-maintaining valve; the pressure retaining valve is arranged on the inner wall of the third pipe sleeve and located at one end, deviating from the heat preservation component, of the third pipe sleeve, and the pressure retaining valve is used for controlling the opening and closing of an inner cavity of the pressure retaining component.

The heat-preservation and pressure-maintaining coring device based on the cold source comprises a pressure-maintaining valve and a core rod, wherein the pressure-maintaining valve comprises a valve seat arranged on the inner wall of the third pipe sleeve and a valve cover fixed on one side of the valve seat facing the heat-preservation part, and the valve cover can rotate on the valve seat and is used for opening or closing an inner cavity of the third pipe sleeve.

The heat preservation pressurize corer based on cold source, wherein, the heat preservation pressurize corer based on cold source still includes coring bit, coring bit installs the pressurize part deviates from the one end of heat preservation part.

The heat-preservation and pressure-maintaining coring device based on the cold source is characterized in that the control component is detachably connected with the heat-preservation component; and/or the heat preservation component is detachably connected with the pressure maintaining component.

The application also discloses a coring method of heat preservation pressurize corer based on cold source, wherein, adopts as above arbitrary heat preservation pressurize corer based on cold source coring.

The coring method of the heat preservation and pressure maintaining coring device based on the cold source comprises the following steps:

opening the control component and the pressure maintaining component, extending the core taking mechanism out of the sleeve mechanism, and rotating the core taking mechanism to obtain a sample;

withdrawing the core taking mechanism into the casing mechanism, and moving the sample into a hollow pipeline of the casing mechanism;

and closing the pressure maintaining part to finish coring.

Compared with the prior art, the embodiment of the invention has the following advantages:

the heat preservation pressurize corer based on cold source in this application can be used to the coring under the multiple environment, put into the heat preservation pressurize corer based on cold source in the drilling of beating in advance, heat preservation pressurize corer based on cold source slides to the bottommost of drilling and begins to get the core, core mechanism carries the sample to enter into the cavity pipeline of bushing mechanism after getting the core, last heat preservation part and the pressurize part of having set up of bushing mechanism, so can make and keep original temperature and pressure in the cavity pipeline, initial temperature and initial pressure can be maintained to the sample of gathering promptly, and extract the corer under this state, thereby obtain the sample that is keeping initial temperature and pressure, be convenient for follow-up analytical research.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a sectional view of the heat preservation and pressure maintaining coring device based on the cold source in the axial direction;

FIG. 2 is a sectional view of the control component of the heat preservation and pressure maintaining coring device based on the cold source in the axial direction;

FIG. 3 is a sectional view of the heat preservation component of the heat preservation and pressure maintaining coring device based on the cold source in the axial direction;

FIG. 4 is a sectional view of the pressure maintaining component of the heat preservation and pressure maintaining coring device based on the cold source in the axial direction;

FIG. 5 is a flow chart of the coring method of the heat preservation and pressure maintaining coring device based on the cold source in the invention.

10, a core taking mechanism; 20. a bushing mechanism; 21. a control component; 211. a first pipe sleeve; 212. a flow control valve; 213. a spring card structure; 22. a heat-insulating member; 221. a second pipe sleeve; 222. a heat preservation pipe sleeve; 223. a liner sleeve; 224. a cold source layer; 23. a pressure maintaining member; 231. a third pipe sleeve; 232. a pressure retaining valve; 2321. a valve seat; 2322. a valve cover; 30. a hollow conduit; 40. a core bit.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

At present, with the development of human society, the conventional energy on the earth is gradually reduced, and the supply of clean energy discovered by people is short, so that the natural gas hydrate is highly regarded as a potential alternative energy worldwide. Natural gas hydrate is an ice-like crystalline substance formed by natural gas and water under high pressure and low temperature conditions, and is called 'Combustible ice', 'solid gas' and 'vapor ice' due to its appearance like ice and its combustion in fire, and has a chemical formula of CH₄·nH₂And O. The natural gas hydrate is commonly found in deep sea sediments or land permafrost, and currently, the total amount of organic carbon contained in the natural gas hydrate in the world is estimated to be twice of that of coal, oil and natural gas known in the world, and the natural gas hydrate is shallow in distribution, wide in distribution, huge in total amount and high in energy density, so that the natural gas hydrate is predicted by the international scientific community to be the best alternative energy source after oil and natural gas and is one of novel clean energy sources which can be alternatively utilized in the 21 st century of human beings.

In the prior art, the collection of the natural gas hydrate still needs exploration, sampling and detection before exploitation, but the natural gas hydrate is different from common ores and rocks, and the temperature and the pressure are different from those in the air at the position where the natural gas hydrate is generated, so that physical properties and chemical properties are easy to change in the process of extracting the natural gas hydrate to the ground surface after sampling, that is, the traditional sampling method cannot keep the initial temperature and the pressure of the natural gas hydrate, and the properties of the sample are changed after being taken out from the ground, so that the initial state and the property parameters of the sample are difficult to analyze, resistance is caused to the analysis and research process of the natural gas hydrate, and the popularization and the use of the natural gas hydrate are prevented.

It should be noted that the heat-preservation and pressure-maintaining coring device and the coring method based on the cold source can be used in the field of combustible ice exploration, but are not limited to the field of combustible ice exploration, and can also be applied to other industries such as ores and rocks, and the extracted sample can be better kept in the initial state through the heat-preservation and pressure-maintaining device and method, so that the characteristics of the sample can be accurately analyzed and researched.

Referring to fig. 1, in an embodiment of the present application, a heat preservation and pressure maintaining coring device based on a cold source is disclosed, wherein the heat preservation and pressure maintaining coring device includes a coring mechanism 10 and a casing mechanism 20, a hollow pipeline 30 is arranged on the casing mechanism 20, and the coring mechanism 10 is installed in the hollow pipeline 30; the casing mechanism 20 comprises a control component 21, a heat preservation component 22 and a pressure maintaining component 23 which are sequentially connected along the axial direction of the core taking mechanism 10.

The heat preservation and pressure maintaining coring device based on the cold source can be used for coring in various environments, the heat preservation and pressure maintaining coring device based on the cold source is placed in a pre-drilled hole, the heat preservation and pressure maintaining coring device based on the cold source slides to the bottommost end of the drilled hole to start coring, power is provided for the coring mechanism 10 through external drill rod transmission or power is provided for the coring mechanism 10 through the connection of a hydraulic motor arranged inside, the coring mechanism 10 is made to drill in a rotating manner to core, in the embodiment, the coring mechanism 10 can be arranged in a combined mode that the central rod is connected with a sample barrel, and the central rod transmits external force to push the sample barrel to drill until a sample enters and is filled with the sample barrel; after coring, the coring mechanism 10 carries the sample into the hollow pipeline 30 of the casing mechanism 20, and the casing mechanism 20 is provided with the heat preservation part 22 and the pressure maintaining part 23, so that the original temperature and pressure can be maintained in the hollow pipeline 30, namely, the acquired sample can maintain the initial temperature and the initial pressure, and the coring device is taken out in the state, so that the sample with the initial temperature and the initial pressure is obtained, and the subsequent analysis and study are facilitated; moreover, the core taking mechanism 10 is always hidden in the sleeve mechanism 20 in the process of the downward sliding of the corer, the sleeve mechanism 20 can protect the core taking mechanism 10, the collision or friction between the drilling side wall and the core taking mechanism 10 is avoided, meanwhile, sundries on the drilling side wall are prevented from falling onto the core taking mechanism 10 in the descending process, and the influence on the sample collection of a target position is avoided.

Specifically, the control component 21, the heat preservation component 22 and the pressure maintaining component 23 are sequentially connected along the axial direction of the core taking mechanism 10, and the reason why the heat preservation component 22 is arranged at the middle position is that the heat preservation component 22 needs to control the temperature in the whole hollow pipeline 30, and the axial direction of the hollow pipeline 30 is relatively long, so the heat convection speed along the axial direction of the hollow pipeline 30 is relatively slow, and if the heat preservation component 22 is arranged at one end of the sleeve mechanism 20, the temperature at the other end of the sleeve mechanism 20 is not well controlled, so the heat preservation component 22 is arranged at the middle; the temperature of the portion of the hollow duct 30 surrounded by the insulating member 22 is maintained, and the distance that the air at this position flows to both ends of the hollow duct 30 is short, so that the temperature of the entire inside of the hollow duct 30 can be controlled more uniformly, and the sample can be in a temperature stable environment. Secondly, when the pressure maintaining part 23 is arranged at the end part, the core taking mechanism 10 can be inserted from one end of the sleeve mechanism 20, which is far away from the pressure maintaining part 23, and extends out of the pressure maintaining part 23, then after the sample is taken, the core taking mechanism 10 retracts, and when the sample completely enters the pressure maintaining part 23, the pressure maintaining part 23 synchronously seals the hollow pipeline 30, so that the pressure inside the sleeve mechanism 20 is rapidly kept stable and separated from the pressure in the external environment until the sample is taken out for detection.

Specifically, as an implementation manner of the present embodiment, it is disclosed that the control component 21 is detachably connected to the heat preservation component 22; and/or the heat preservation component 22 is detachably connected with the pressure maintaining component 23. Because the shape of the heat preservation and pressure maintaining coring device based on the cold source disclosed in the embodiment is slender, the operation in the drilling is convenient, but the slender mechanism is inconvenient to maintain, if the heat preservation and pressure maintaining coring device fails in the using process, the heat preservation and pressure maintaining coring device is not easy to detect and replace, the control component 21 and the heat preservation component 22 and the pressure maintaining component 23 are detachably connected, the heat preservation and pressure maintaining coring device based on the cold source is convenient to replace and detect independently, the heat preservation and pressure maintaining coring device based on the cold source is convenient to maintain, and meanwhile, the heat preservation and pressure maintaining coring device is convenient to transport.

Specifically, as another implementation manner of this embodiment, it is disclosed that a first butting inner ring is disposed at one end of the control component 21 facing the heat preservation component 22, a first butting outer ring is correspondingly disposed at one end of the heat preservation component 22 facing the control component 21, and the first butting outer ring is wrapped on an outer side wall of the first butting inner ring; a second butt-joint inner ring is arranged at one end, facing the pressure maintaining part 23, of the heat insulation part 22, a second butt-joint outer ring is correspondingly arranged at one end, facing the heat insulation part 22, of the pressure maintaining part 23, and the second butt-joint outer ring is wrapped on the outer side wall of the second butt-joint inner ring. Through the arrangement of the first butt joint outer ring and the first butt joint inner ring and the wrapping type butt joint mode of the second butt joint outer ring and the second butt joint inner ring, the control component 21 and the heat preservation component 22 and the pressure maintaining component 23 are firmly connected, and the sleeved connection mode does not generate a large air leakage gap at the connection position, so that a stable pressure closed state can be better kept in the storage inner cavity of the sleeve mechanism 20. Certainly, in order to further improve the connection air tightness, sealing rings, such as rubber sealing rings or plastic sealing rings, may be disposed on the contact interfaces between the first butt inner ring and the first butt outer ring and between the second butt inner ring and the second butt outer ring, and the elastic sealing rings are squeezed to block the gaps on the connection interfaces, so as to further isolate the environment inside the casing mechanism 20 from the external environment, thereby obtaining a better heat and pressure preservation effect. Specifically, in the actual production process, the control member 21, the heat insulating member 22, and the pressure holding member 23 may be connected by other connection means having good airtightness, such as bonding or welding.

Referring to fig. 2, as another implementation manner of this embodiment, it is disclosed that the control component 21 includes a first pipe sleeve 211, a flow control valve 212, and a snapping structure 213, where the first pipe sleeve 211 is connected to an end of the thermal insulation component 22 away from the pressure maintaining component 23, and the core-pulling mechanism 10 is installed in an inner cavity of the first pipe sleeve 211; the flow control valve 212 is arranged on the inner wall of the first pipe sleeve 211 and is positioned at one end of the first pipe sleeve 211, which is far away from the heat preservation part 22, and the flow control valve 212 is used for controlling the movement of the coring mechanism 10; the elastic clip structure 213 is disposed on an outer wall of the first socket 211, and is used for fixing the first socket 211. Because the heat-preservation and pressure-maintaining coring device based on the cold source is placed into a pre-drilled hole when in use, and the aperture of the pre-drilled hole is generally slightly larger than the radial width of the coring device, the contact between the side wall of the coring device and the side wall of the hole can be reduced in the process of placing the coring device into the bottom of the hole, so that the frictional resistance is reduced, the coring device can conveniently reach the bottom of the hole, the side wall of the hole is prevented from being broken to generate fragments, the fragments falling to the bottom of the hole are prevented from blocking the coring device, and the influence on sampling is avoided; so the corer is not fixed when putting at the hole bottom, and the corer will bore the sample article during sample, must produce vibrations, and the unable stability of corer then can influence the sample, sets up bullet card structure 213 on first pipe box 211, and when the corer falls to the hole bottom, bullet card structure 213 opens and supports the lateral wall in hole, makes the corer fixed, then can maintain the stability of sample in-process, samples smoothly.

Specifically, when the heat preservation and pressure maintaining coring device based on the cold source disclosed in the embodiment is in an initial state, the coring mechanism 10 is fixed in the hollow pipeline 30, the flow control valve 212 is closed, the coring mechanism 10 is locked by the pin, the coring mechanism 10 is kept still in the process that the coring device falls to the bottom of the drilling hole, collision between the coring mechanism 10 and the casing mechanism 20 before work is avoided, damage is reduced, after the coring device falls to the bottom of the drilling hole and is stable, the pin is cut off by hydraulic pressure generated by the flow of a circulating fluid medium, the flow control valve 212 is opened, the coring mechanism 10 is loosened, and the coring mechanism 10 can freely extend out of the casing mechanism 20 to drill a sample. The flow control valve 212 is simple and convenient to use, and does not need to be controlled by complex structures such as a circuit module, a communication module and the like, so that the heat-preservation and pressure-maintaining coring device based on a cold source is simple in structure and low in manufacturing cost.

Specifically, as another implementation manner of this embodiment, it is disclosed that the elastic clip structure 213 includes a rotating rod and an elastic member, for example, the elastic member may be a spring, one end of the rotating rod is hinged to the first socket 211, and the elastic member is disposed between the other end of the rotating rod and the first socket 211. The elastic clamping structure 213 is closed in the falling process of the coring device, the rotating piece is leaned against the first pipe sleeve 211, the elastic piece is compressed, after the coring device reaches the target position, the elastic piece naturally recovers, the rotating piece is bounced open, one end of the rotating piece is connected to the first pipe sleeve 211, and the other end of the rotating piece is abutted against the inner wall of the hole to form support; a plurality of snap structures 213 may be provided around the radial direction of the first socket 211 such that the first socket 211 is supported in all directions, thereby maintaining the overall stability of the corer. The fixing mode is simple and convenient, is easy to realize, and does not need complex control operation.

Referring to fig. 3, as another implementation manner of this embodiment, it is disclosed that the heat preservation component 22 includes a second pipe sleeve 221, a heat preservation pipe sleeve 222, an inner lining pipe sleeve 223, and a cold source layer 224, where one end of the second pipe sleeve 221 is connected to the control component 21, and the other end is connected to the pressure maintaining component 23; the heat-insulating pipe sleeve 222 is arranged on the inner wall of the second pipe sleeve 221; the lining pipe sleeve 223 is arranged on the inner wall of the heat preservation pipe sleeve 222, the core taking mechanism 10 is arranged in the inner cavity of the lining pipe sleeve 223, and a storage cavity is arranged between the lining pipe sleeve 223 and the heat preservation pipe sleeve 222; the cold source layer 224 is disposed within the storage cavity. The heat preservation component 22 of the application is not only provided with the lining pipe sleeve 223 and the heat preservation pipe sleeve 222 to form a heat insulation storage cavity, so that heat transferred on the heat preservation component 22 is reduced, but also provided with the cold source layer 224 in the storage cavity to increase the effects of heat insulation and heat preservation; specifically, the cold source layer 224 includes at least one of a liquid nitrogen layer, a low-temperature alcohol layer, and a mixed layer of liquid nitrogen and low-temperature alcohol, and the thermal conductivity of both liquid nitrogen and alcohol is relatively low, so that the heat conduction on the cold source layer 224 is very small, the temperature is not easy to be transferred on the inner side and the outer side of the casing mechanism 20, and a good heat preservation effect can be achieved; however, in the actual use process, any heat insulation structure cannot realize absolute heat insulation, so that the sample can inevitably exchange energy with the external diameter, the external environment is continuously changed in the process of taking out the heat-preservation and pressure-maintaining coring device based on the cold source, the altitude and the atmospheric temperature are all changed, and the temperature change of the heat-preservation and pressure-maintaining coring device based on the cold source can be inevitably caused; at this time, the existence of the cold source layer 224 can perform physical temperature control on the hollow pipeline 30 through the change of the physical states of gas and liquid, and the temperature of the sample is kept at the initial temperature as much as possible, so that the heat preservation and pressure maintaining effects are achieved from beginning to end.

Referring to fig. 4, as another implementation manner of the present embodiment, it is disclosed that the pressure maintaining member 23 includes a third pipe sleeve 231 and a pressure maintaining valve 232, the third pipe sleeve 231 is connected to an end of the heat insulating member 22 away from the control member 21, and the core removing mechanism 10 is installed in an inner cavity of the third pipe sleeve 231; the pressure retaining valve 232 is disposed on an inner wall of the third pipe sleeve 231 and located at an end of the third pipe sleeve 231 facing away from the heat preservation member 22, and the pressure retaining valve 232 is used for controlling opening and closing of an inner cavity of the pressure retaining member 23. Before coring, the core taking mechanism 10 is inserted into the hollow pipeline 30 until the inner cavity of the third pipe sleeve 231 of the pressure maintaining part 23, at the moment, the pressure maintaining valve 232 is kept in an open state, so that the core taking mechanism 10 can move freely, coring can be started directly after the corer reaches a specified position, according to a drilling route of the core taking mechanism 10, the core taking mechanism extends into the hollow pipeline 30 from one end provided with the control part 21, and extends out of the hollow pipeline 30 from one end provided with the pressure maintaining part 23, so that the pressure maintaining valve 232 is passed by a sample firstly during recovery, and the pressure maintaining valve 232 is closed immediately after the core taking mechanism 10 grabs the pressure maintaining sample to enter the hollow pipeline 30, namely an opening of the hollow pipeline 30 is closed, the space in the hollow pipeline 30 is isolated, and the heat preservation state is further realized; in order to close the hollow pipe 30 immediately after the sample enters the hollow pipe 30, it is most effective to provide the pressure retaining valve 232 at the end of the third socket 231 facing away from the heat retaining member 22.

It should be noted that, in this embodiment, the heat preservation and pressure maintaining coring device based on the cold source usually needs to extend into a deep drilling hole to work, even to perform submarine exploration work, so the environmental pressure received during the work is very large, and therefore the first pipe sleeve 211, the second pipe sleeve 221, and the third pipe sleeve 231 of the present application may be set as metal members, such as stainless steel, ferrochrome alloy, tungsten steel alloy, and the like, and the metal members have a large hardness and a large rigidity, and can better adapt to a high-pressure environment, thereby reducing the risk that the coring device is pressed and deformed by the environment during the work process, avoiding the sample from being stuck in the hollow pipeline 30, and preventing the subsequent research on the sample from being affected.

As shown in fig. 4, as another implementation manner of the embodiment, it is disclosed that the pressure retaining valve 232 includes a valve seat 2321 mounted on the inner wall of the third socket 231 and a valve cover 2322 fixed on a side of the valve seat 2321 facing the heat retaining member 22, and the valve cover 2322 is rotatable on the valve seat 2321 for opening or closing the inner cavity of the third socket 231. The valve seat 2321 may be disposed in an annular shape, the annular valve seat 2321 is perpendicular to the inner wall of the third sleeve 231, the outer side of the valve seat 2321 contacts and is fixed on the inner wall of the third sleeve 231, the inner side of the valve seat 2321 is used for passing through the core-removing mechanism 10, the valve cover 2322 is rotatably connected to the valve seat 2321, can rotate to be perpendicular to the valve seat 2321 and is attached to the inner wall of the third sleeve 231, so as to avoid the core-removing mechanism 10, and can also rotate to be in the same plane as the valve seat 2321, so as to cover the inner cavity of the valve seat 2321, thereby realizing closure and isolating the inside and outside environments of the hollow pipeline 30; the pressure retaining valve 232 is simple in structure and easy to operate. In order to fix the pressure retaining valve 232 on the third pipe sleeve 231 firmly, a sealing ring may be disposed on the outer side wall of the valve seat 2321 when the valve seat 2321 is installed, a gap between the valve seat 2321 and the third pipe sleeve 231 is reduced by pressing the sealing ring, so as to increase air tightness, and meanwhile, in order to prevent the sealing ring on the valve seat 2321 from slipping, a clamping groove may be disposed on the outer side wall of the valve seat 2321 to clamp the sealing ring; similarly, the matching of the valve cover 2322 and the valve seat 2321 can also increase the air tightness by arranging a sealing ring on the side wall of the valve cover 2322, when the valve cover 2322 is covered on the valve seat 2321, the side wall of the valve cover 2322 is contacted with the valve seat 2321, and the sealing ring is extruded, so that the air tightness of the port of the hollow pipeline 30 is increased, and overall, the coring device can better reduce heat transfer when temporarily storing a sample, and realize better heat preservation and pressure maintaining effects; a groove may also be provided in the sidewall of the valve cap 2322 to capture the sealing ring so that the sealing ring does not slip when the valve cap 2322 is mated with the valve seat 2321.

Specifically, as another implementation manner of the present embodiment, it is disclosed that a first edge chamfer is provided on a side of the valve cover 2322 facing the valve seat 2321; one side of the valve seat 2321 facing the valve cover 2322 is provided with a second edge chamfer, and the inclination angle of the first edge chamfer is the same as that of the second edge chamfer. The contact interface of the valve cover 2322 and the valve seat 2321 is an inclined surface, so that the contact gap between the valve cover 2322 and the valve seat 2321 is increased, the difficulty of heat transfer through the contact gap is increased, meanwhile, the contact interface area between the valve cover 2322 and the valve seat 2321 is increased, the joint is tighter, the turnover is not easy, and the good sealing state can be kept. Moreover, the seal ring on the bonnet 2322 may be disposed on the first edge chamfer such that the seal ring does not slide easily even if a groove seal is not disposed on the first edge chamfer; of course, it is more stable to provide the groove on the first edge chamfer.

Specifically, as another implementation manner of this embodiment, it is disclosed that the heat preservation and pressure maintaining coring device based on the cold source further includes a coring bit 40, and the coring bit 40 is installed at one end of the pressure maintaining component 23 that is away from the heat preservation component 22. The coring bit 40 disclosed in this embodiment may be configured to be sleeved with a pressure maintaining structure to maintain a stable and secure connection; meanwhile, the outer side wall of the coring bit 40 is provided with a threaded knife edge for drilling a notch at the bottom of a drilled hole and independently cutting out a sample, the coring bit 40 can be internally hollow and is communicated with the hollow pipeline 30, the coring mechanism 10 can extend into the inner cavity of the bit, the coring bit 40 drills out an annular notch at the bottom of the drilled hole along with downward drilling of the coring bit 40, a columnar sample in the annular notch is grabbed by the coring mechanism 10 and then is lifted out of the hollow pipeline 30, the sampling mode synchronously performs cutting and sampling, and the sampled sample is moved into the hollow pipeline 30 in situ to be stored in a heat-preserving and pressure-maintaining mode, so that the aim of keeping the original temperature and pressure of the sample can be fulfilled as far as possible.

As another embodiment of this application, this application still discloses a heat preservation pressurize coring method of coring based on cold source, wherein, adopts as above arbitrary the heat preservation pressurize coring device based on cold source to core.

Referring to fig. 5, as an implementation manner of this embodiment, it is disclosed that the coring method of the heat preservation and pressure maintaining coring device based on the cold source includes:

s100, opening a control part 21 and a pressure maintaining part 23, extending out of a core taking mechanism 10 to a sleeve mechanism 20, and rotating the core taking mechanism 10 to obtain a sample;

s200, withdrawing the core taking mechanism 10 into the casing mechanism 20, and moving the sample into the hollow pipeline 30 of the casing mechanism 20;

and S300, closing the pressure maintaining component 23 to finish coring.

The coring method of the heat preservation and pressure maintaining coring device based on the cold source comprises the steps of firstly assembling components such as a coring mechanism 10, a control structure, a heat preservation structure and a pressure maintaining structure on the ground, then putting the coring device into the bottom of a drill hole through an inner hole of a drill rod, then starting coring operation, directly sending a sample into a sleeve mechanism 20 for heat preservation and pressure maintaining storage after grabbing the sample through the movement of the coring mechanism 10, closing a pressure maintaining component 23 on site, closing a hollow pipeline 30, preserving the initial temperature and pressure of the sample as much as possible, then taking out the coring device, and transporting the coring device to a laboratory.

In summary, the embodiment of the application discloses a heat preservation and pressure maintaining coring device based on a cold source, wherein the heat preservation and pressure maintaining coring device comprises a coring mechanism 10 and a casing mechanism 20, a hollow pipeline 30 is arranged on the casing mechanism 20, and the coring mechanism 10 is installed in the hollow pipeline 30; the casing mechanism 20 comprises a control component 21, a heat preservation component 22 and a pressure maintaining component 23 which are sequentially connected along the axial direction of the core taking mechanism 10. The heat preservation and pressure maintaining coring device based on the cold source can be used for coring in various environments, the heat preservation and pressure maintaining coring device based on the cold source is put into a pre-drilled hole, the heat preservation and pressure maintaining coring device based on the cold source slides to the bottom end of the drilled hole to start coring, the core taking mechanism 10 is powered by the transmission of an external drill rod or the core taking mechanism 10 is powered by a hydraulic motor arranged inside, so that the core taking mechanism 10 drills in a rotating way to take core, the core taking mechanism 10 carries a sample to enter a hollow pipeline 30 of a sleeve mechanism 20 after core taking, a heat preservation part 22 and a pressure maintaining part 23 are arranged on the sleeve mechanism 20, the original temperature and pressure can be maintained within the hollow conduit 30, i.e., the collected sample can maintain the original temperature and pressure, and the corer is taken out in this state, so that a sample with the initial temperature and pressure maintained is obtained, and the subsequent analysis and research are facilitated.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.