CN113622851B - Natural gas hydrate heat preservation pressurize corer - Google Patents
Natural gas hydrate heat preservation pressurize corer Download PDFInfo
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- CN113622851B CN113622851B CN202110923632.5A CN202110923632A CN113622851B CN 113622851 B CN113622851 B CN 113622851B CN 202110923632 A CN202110923632 A CN 202110923632A CN 113622851 B CN113622851 B CN 113622851B
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- pressure
- corer
- outer tube
- rock core
- energy storage
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000004321 preservation Methods 0.000 title claims abstract description 17
- 239000004065 semiconductor Substances 0.000 claims abstract description 57
- 239000011435 rock Substances 0.000 claims abstract description 49
- 230000006698 induction Effects 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 43
- 238000004146 energy storage Methods 0.000 claims description 34
- 238000003860 storage Methods 0.000 claims description 25
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 5
- 238000011065 in-situ storage Methods 0.000 abstract description 10
- 238000005057 refrigeration Methods 0.000 abstract description 10
- 230000008859 change Effects 0.000 abstract description 6
- 230000033228 biological regulation Effects 0.000 abstract description 2
- 238000007710 freezing Methods 0.000 description 8
- 230000008014 freezing Effects 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
- 239000011810 insulating material Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- LZLVZIFMYXDKCN-QJWFYWCHSA-N 1,2-di-O-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCC\C=C/C\C=C/C\C=C/C\C=C/CCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC LZLVZIFMYXDKCN-QJWFYWCHSA-N 0.000 description 2
- PJISLFCKHOHLLP-UHFFFAOYSA-N 2-diethoxyphosphorylsulfanyl-n,n-diethylethanamine Chemical compound CCOP(=O)(OCC)SCCN(CC)CC PJISLFCKHOHLLP-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004964 aerogel Substances 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
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- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 239000011490 mineral wool Substances 0.000 description 1
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- 230000002277 temperature effect Effects 0.000 description 1
- 230000005676 thermoelectric effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
Abstract
The application discloses a natural gas hydrate heat-preservation pressure-maintaining corer, which comprises an energy accumulator, wherein the energy accumulator is arranged in a rock core pipe and is used for maintaining the constant pressure in the rock core pipe; the induction device is arranged in the rock core pipe; the semiconductor refrigerator is arranged on the outer tube; the stator end of the conductive slip ring is connected with a power supply device, and the rotor end of the conductive slip ring is electrically connected with the semiconductor refrigerator; the controller is respectively and electrically connected with the induction device and the conductive slip ring, when the pressure in the rock core tube changes, the pressure in the rock core tube is kept constant through the energy accumulator, and when the temperature change is detected, the electric energy required by the refrigeration of the semiconductor refrigerator is transmitted through the conductive slip ring, so that the intelligent regulation of the temperature and the pressure in the rock core tube is realized, and the natural gas hydrate in the rock core tube is kept in an in-situ state for a long time.
Description
Technical Field
The application relates to the technical field of coring, in particular to a natural gas hydrate heat-preserving and pressure-maintaining coring device.
Background
The natural gas hydrate is also called as combustible ice (hereinafter referred to as combustible ice) which is a new energy source with huge reserves, has the advantages of high energy density and small environmental pollution, and is a natural resource with great exploitation value. The coring of the combustible ice is an important means for researching the hiding mechanism, physical and chemical properties and reserve distribution of the combustible ice, but the combustible ice can only exist stably in a low-temperature high-pressure environment and is sensitive to temperature and pressure changes, so that the development of the coring technology of the combustible ice with heat preservation and pressure maintaining is particularly critical.
The prior technical proposal of the combustible coring can be divided into two main types, one type is to start from 'pressure maintaining' to maintain the original pressure of the combustible ice, and the other type is to start from 'heat preservation' to maintain or even reduce the temperature of the combustible ice in the coring process.
The pressure maintaining coring scheme comprises the following steps: a pressure maintaining core barrel (Pressure Core Barrel, PCB) adopted by the international deep sea drilling program (Deep Sea Drilling Project, DSDP); plunger corers (Advanced Piston Corer, APC) and dwell corers (Pressure Core Sampler, PCS) employed by international ocean drilling program (Ocean Drilling Program, ODP); the purpose of pressure maintaining is achieved by sealing the obtained flammable ice core in a core cabin by an impact Corer (Fu-gro Pressure Corer, FPC) and a Rotary Corer (HRC) adopted by HY-ACE, (the Hydrate Autoclave Coring Equipment System), an r.v. sone, a multiple high pressure Corer (The Multiple Autoclave Corer, MAC) adopted by cruising, and a dynamic high pressure piston Corer (Dynamic Autoclave Piston Corer, DAPC).
The method adopting the heat preservation coring scheme comprises the following steps: semiconductor freezing corer (Pressure Temperature Core Sampler, PTCS) developed by Chongqing university and natural gas hydrate hole bottom freezing sampler developed by Jilin university achieve the aim of heat preservation by cooling and freezing combustible ice.
In the aspect of pressure maintenance, the ball valve is adopted for sealing, so that the defects of low coring rate and weak pressure maintaining capability are caused; the heat insulation material is adopted in the heat preservation scheme, the temperature rising process of the rock core can be slowed down only in a short time, the temperature rising of the rock core is unavoidable, and the other type adopts a freezing means, so that the flammable ice rock core is frozen, the in-situ temperature is not maintained, and the structure and the physical property of the flammable ice rock core are changed.
Accordingly, there is a need to develop a coring device that can have the ability to maintain in-situ pressure and temperature during the coring process.
Disclosure of Invention
The application aims to solve the technical problems of the prior art, provides a natural gas hydrate heat-preserving and pressure-maintaining corer, and aims to solve the technical problems of weak heat-preserving and pressure-preserving capability of the corer in the coring process in the prior art.
The application provides a natural gas hydrate heat-preservation pressure-maintaining corer, which comprises an outer pipe and a core pipe arranged in the outer pipe, and further comprises: the energy accumulator is arranged in the rock core pipe and is used for maintaining the constant pressure in the rock core pipe; the induction device is arranged in the outer tube and comprises a temperature sensor; the semiconductor refrigerator is arranged on the outer tube; the stator end of the conductive slip ring is connected with a power supply device, and the rotor end of the conductive slip ring is electrically connected with the semiconductor refrigerator; and the controller is electrically connected with the induction device and the conductive slip ring respectively.
Further, the semiconductor refrigerator is arranged on the inner wall of the outer tube;
the semiconductor refrigerators are provided with a plurality of heat insulation pieces, and heat insulation pieces are arranged between every two adjacent semiconductor refrigerators.
Further, the semiconductor refrigerator includes:
the refrigerator refrigerating end faces to one side of the inner wall of the outer tube, the refrigerator heating end faces to one side of the outer wall of the outer tube, and the refrigerator heating end is connected with radiating fins.
Further, the thickness of the semiconductor refrigerator is greater than the thickness of the heat insulating member.
Further, a central rod is arranged in the outer tube, and a valve seat is arranged at the bottom end of the outer tube;
the bottom end of the rock core pipe is in sealing connection with the valve seat, and the top end of the rock core pipe is in sealing connection with the bottom end of the center rod; the energy accumulator is fixedly connected with the bottom end of the central rod.
Further, the accumulator includes:
the energy storage device comprises an energy storage device gas injection pipe, an energy storage device gas storage cavity and an energy storage device piston, wherein the energy storage device gas injection pipe, the energy storage device gas storage cavity and the energy storage device piston are sequentially arranged along the axial direction of the rock core pipe, the energy storage device gas injection pipe is communicated with the energy storage device gas storage cavity, the first end of the energy storage device piston is communicated with the energy storage device gas storage cavity, and the second end of the energy storage device piston is communicated with the rock core pipe.
Further, the sensing device also comprises a pressure sensor; the induction device is arranged at one end of the energy accumulator gas injection pipe, which is far away from the energy accumulator gas storage cavity.
Further, the outer wall of the center rod is provided with a conductive copper bar, and the stator end of the conductive slip ring is electrically connected with the power supply device through the conductive copper bar.
Further, a mounting hole is formed in the bottom end of the central rod, the controller is arranged in the mounting hole, and the energy accumulator is fixedly connected with the inner wall of the mounting hole.
Further, the controller includes: the micro control chip is electrically connected with the sensing device and the conductive slip ring respectively; and the memory is used for storing temperature and pressure data.
The beneficial effects are that: the application provides a natural gas hydrate heat-preservation pressure-maintaining corer, which comprises an outer pipe and a core pipe arranged in the outer pipe, and further comprises: the energy accumulator is arranged in the rock core pipe and is used for maintaining the constant pressure in the rock core pipe; the induction device is arranged in the outer tube and comprises a temperature sensor; the semiconductor refrigerator is arranged on the outer tube; the stator end of the conductive slip ring is connected with a power supply device, and the rotor end of the conductive slip ring is electrically connected with the semiconductor refrigerator; and the controller is electrically connected with the induction device and the conductive slip ring respectively. According to the application, when the pressure in the rock core tube changes, the pressure in the rock core tube is kept constant through the energy accumulator, and when the temperature change is detected, the electric energy required by the refrigeration of the semiconductor refrigerator is transmitted through the conductive slip ring, so that the intelligent adjustment of the temperature and the pressure in the rock core tube is realized, and the natural gas hydrate in the rock core tube is kept in an in-situ state for a long time (meanwhile, the in-situ temperature and the in-situ pressure of the flammable ice rock core are kept, so that the structure and the physical property of the flammable ice core are not changed).
Drawings
In order to more clearly describe the embodiments of the present application or the technical solutions in the background art, the following description will describe the drawings that are required to be used in the embodiments of the present application or the background art.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic diagram of a first structure of a natural gas hydrate heat-preserving and pressure-maintaining corer of the present application;
FIG. 2 is a schematic diagram of a second configuration of a natural gas hydrate insulated pressure maintaining corer of the present application;
fig. 3 is a schematic diagram of a control principle of a natural gas hydrate heat-preserving and pressure-maintaining corer.
Reference numerals:
100. an outer tube; 101. a semiconductor refrigerator; 102. a heat insulating member; 103. a conductive slip ring; 110. spring card; 120. a compression ring; 130. a gland; 140. a valve cover; 150. a valve seat; 160. rupture disk; 170. a pressure relief port; 200. a central rod; 210. a conductive copper bar; 220. a cable interface; 230. a battery; 240. a micro control chip; 300. core pipe; 310. an induction device; 320. an accumulator gas injection pipe; 330. an air injection port; 340. an accumulator gas storage chamber; 350. an accumulator piston.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear and clear, the present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "top," "bottom," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the application, unless explicitly stated and limited otherwise, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact by another feature therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.
The existing technical schemes of the combustible coring can be divided into two main types, one type is to start from 'pressure maintaining', maintain the original pressure of the combustible ice, and the other type is to start from 'heat preservation', maintain and even reduce the temperature of the combustible ice in the coring process.
The pressure maintaining coring scheme comprises the following steps: a pressure maintaining core barrel (Pressure Core Barrel, PCB) adopted by the international deep sea drilling program (Deep Sea Drilling Project, DSDP); plunger corers (Advanced Piston Corer, APC) and dwell corers (Pressure Core Sampler, PCS) employed by international ocean drilling program (Ocean Drilling Program, ODP); the purpose of pressure maintaining is achieved by sealing the obtained flammable ice core in a core cabin by an impact Corer (Fu-gro Pressure Corer, FPC) and a Rotary Corer (HRC) adopted by HY-ACE, (the Hydrate Autoclave Coring Equipment System), an r.v. sone, a multiple high pressure Corer (The Multiple Autoclave Corer, MAC) adopted by cruising, and a dynamic high pressure piston Corer (Dynamic Autoclave Piston Corer, DAPC).
The method adopting the heat preservation coring scheme comprises the following steps: semiconductor freezing corer (Pressure Temperature Core Sampler, PTCS) developed by Chongqing university and natural gas hydrate hole bottom freezing sampler developed by Jilin university achieve the aim of heat preservation by cooling and freezing combustible ice.
In the aspect of pressure maintenance, the ball valve is adopted for sealing, so that the defects of low coring rate and weak pressure maintaining capability are caused; the heat insulation material is adopted in the heat preservation scheme, the temperature rising process of the rock core can be slowed down only in a short time, the temperature rising of the rock core is unavoidable, and the other type adopts a freezing means, so that the flammable ice rock core is frozen, the in-situ temperature is not maintained, and the structure and the physical property of the flammable ice rock core are changed.
Based on the above, the embodiment of the application provides a natural gas hydrate heat-preserving and pressure-maintaining corer, which comprises an outer pipe and a core pipe arranged in the outer pipe, and further comprises: the energy accumulator is arranged in the rock core pipe and is used for maintaining the constant pressure in the rock core pipe; the sensing device is arranged in the rock core pipe and comprises a temperature sensor; the semiconductor refrigerator is arranged on the outer tube; the stator end of the conductive slip ring is connected with a power supply device, and the rotor end of the conductive slip ring is electrically connected with the semiconductor refrigerator; and the controller is electrically connected with the induction device and the conductive slip ring respectively.
The natural gas hydrate heat-preservation pressure-maintaining corer provided by the embodiment of the application is described in detail below by referring to the attached drawings through specific embodiments and application scenes thereof.
As shown in fig. 1 and 2, the coring device comprises an outer tube 100, a core barrel 300 and a central rod 200 which are arranged in the outer tube 100, wherein the core barrel 300 is fixed by the central rod 200 above the core barrel 300, a coring bit and a valve seat 150 are arranged at the bottom of the outer tube 100, a valve cover 140 of the valve seat 150 is opened in the coring process, the central rod 200 is positioned to rest relative to a stratum, the coring bit and the core barrel 300 vertically move downwards relative to the stratum, a core (combustible ice) can enter the core barrel 300, and when the core enters the core barrel 300, the valve cover 140 is closed, and the core barrel 300 forms a sealed space to maintain the core pressure.
After the core 300 is filled with the core, the core is lifted to the ground, and the temperature and pressure change in the core is easily caused due to the large change of the ambient temperature and pressure in the lifting process of the core.
In the present embodiment, therefore, in terms of pressure maintenance, an accumulator is provided in the coring device, and the pressure inside the core barrel 300 is maintained constant by the accumulator.
In terms of heat preservation, the temperature inside the core barrel 300 is fixed by arranging the induction device 310, the semiconductor refrigerator 101, the conductive slip ring 103, the power supply device and the controller.
The sensing device 310 is used for detecting the temperature condition in the core barrel 300 during the coring process, the sensing device 310 is disposed inside the outer tube 100, preferably, in order to enable the sensing device 310 to more accurately detect the real-time temperature of the core barrel, the sensing device 310 may be disposed inside the core barrel 300.
The semiconductor refrigerator 101 is a device for producing cold by using the thermoelectric effect of a semiconductor, and is also called a thermoelectric refrigerator. The two different metals are connected by a conductor, and the two different metals are provided with a refrigeration end and a heating end which are arranged oppositely, and when direct current is connected, the temperature of the refrigeration end is reduced, and the temperature of the heating end is increased. The semiconductor refrigerator 101 may be disposed in the outer tube 100 with the refrigeration end facing the inside of the core barrel 300 and the heating end facing the outside of the core barrel 300 to facilitate providing refrigeration to the core barrel 300.
The conductive slip ring 103 is used for realizing the transmission of electric energy required by the power supply of the semiconductor refrigerator 101, and comprises a stator end and a rotor end, wherein the stator end is connected with a power supply device, the rotor end is connected with the semiconductor refrigerator 101, the rotor end stands relative to a stratum in the coring process, and the rotor end of the stator end rotates along with the outer tube 100 of the corer.
The power supply is connected to the conductive slip ring 103, and may be disposed inside the coring device or outside the coring device to provide long-term power support more stably. Those skilled in the art can make the settings according to actual needs.
The controller is arranged inside the outer tube 100, the micro control chip 240 is arranged inside the controller, the controller is electrically connected with the sensing device 310 and the power supply device, in the coring process, the controller receives the temperature information transmitted by the sensing device 310 and records and analyzes the temperature information, when the temperature changes, the power supply device starts to supply power to the conductive slip ring 103 and provides refrigeration for the semiconductor refrigerator 101 through the conductive slip ring 103, so that the temperature in the rock core tube 300 can be kept constant for a long time in the coring process.
In terms of pressure maintenance, an accumulator is provided within the core barrel 300 to maintain a constant pressure.
Specifically, the energy accumulator is fixedly arranged at the top end inside the core barrel 300, the core is positioned at the bottom end inside the core barrel 300, the energy accumulator is used for accumulating pressure energy, the pressure inside the core barrel 300 is dynamically maintained to be stable, and when the pressure inside the core barrel 300 drops in the coring process, the pressure inside the core barrel 300 is compensated through the energy accumulator, so that the pressure is maintained to be stable; when the pressure in the core barrel 300 rises during coring, this energy is then used as a system by the accumulator to maintain a constant pressure in the core barrel 300 during coring for a long period of time.
Therefore, in this embodiment, the heat-preserving and pressure-maintaining structure is combined together in the coring device, when the pressure in the core barrel 300 changes, the pressure in the core barrel 300 is kept constant by adjusting the energy accumulator, and when the temperature change is detected, the electric energy required by the refrigeration of the semiconductor refrigerator 101 is transmitted through the conductive slip ring 103, so that the intelligent adjustment of the temperature and the pressure in the core barrel 300 is realized, the combustible ice in the core barrel is kept in the in-situ state for a long time, and the combustible ice is not decomposed in the coring process.
In order to achieve a better constant temperature effect on the basis of the above embodiment, the semiconductor refrigerator 101 is provided on the inner wall of the outer tube 100; the semiconductor refrigerators 101 are provided in plurality, and heat insulators 102 are provided between adjacent semiconductor refrigerators 101.
As shown in fig. 2, the semiconductor refrigerator 101 is disposed on the inner wall of the outer tube 100, the semiconductor refrigerator is disposed near the core barrel 300, and the semiconductor refrigerator 101 is provided in plurality, and the plurality of semiconductor refrigerators 101 are uniformly arranged so as to facilitate rapid cooling. In addition, in the present embodiment, the heat insulator 102 is provided between any two adjacent semiconductor refrigerators 101, so that heat generated at the heating end of the semiconductor refrigerator 101 is prevented from being transferred to the cooling end of the adjacent semiconductor refrigerator 101, and the cooling effect is prevented from being affected.
Specifically, the heat insulating member 102 is filled with a heat insulating material for preventing heat transfer between the adjacent semiconductor refrigerators 101, and the heat insulating material may be a conventional heat insulating material such as glass fiber, asbestos, rock wool, silicate, etc., or a novel heat insulating material such as aerogel blanket, vacuum plate, etc. Preferably, the thickness of the semiconductor refrigerator 101 is greater than the thickness of the heat insulating member 102.
In addition to the above embodiment, the semiconductor refrigerator 101 includes: the refrigerator refrigerating end faces to one side of the inner wall of the outer tube 100, the refrigerator heating end faces to one side of the outer wall of the outer tube 100, and the refrigerator heating end is connected with radiating fins.
As shown in fig. 2, the semiconductor refrigerator 101 includes a refrigerator refrigerating end and a refrigerator heating end, which are disposed opposite to each other, and the refrigerator heating end faces one side of the outer wall of the outer tube 100 and is connected with a heat sink, so that heat generated by the refrigerator heating end in the working process of the semiconductor refrigerator 101 is more easily dissipated to the outside, thereby improving the refrigerating efficiency of the semiconductor refrigerator 101.
On the basis of the above embodiment, the outer tube 100 is provided with a central rod 200, and the bottom end of the outer tube 100 is provided with a valve seat 150; the bottom end of the core barrel 300 is in sealing connection with the valve seat 150, and the top end of the core barrel 300 is in sealing connection with the bottom end of the center rod 200; the accumulator is fixedly connected with the bottom end of the central rod 200.
As shown in fig. 1, a central rod 200 and a core tube 300 are sequentially arranged along the axial direction of an outer tube 100, the top end of the core tube 300 and an energy accumulator in the core tube 300 are both connected with the bottom end of the central rod 200, the bottom end of the outer tube 100 is provided with a valve seat 150, in the coring process, when a core enters the core tube 300 through the valve seat 150, a valve cover 140 is closed to form a sealed space, and preferably, the valve seat 150 can be a flap valve so as to improve the coring rate.
In accordance with the above embodiment, the accumulator includes: the energy storage device comprises an energy storage gas injection pipe 320, an energy storage gas storage cavity 340 and an energy storage piston 350 which are sequentially arranged along the axial direction of a rock core pipe 300, wherein the energy storage gas injection pipe 320 is communicated with the energy storage gas storage cavity 340, a first end of the energy storage piston 350 is communicated with the energy storage gas storage cavity 340, and a second end of the energy storage piston 350 is communicated with the rock core pipe 300; the sensing device 310 is disposed at an end of the accumulator gas filling pipe 320 away from the accumulator gas storage chamber 340.
As shown in fig. 2, the pressure in the corer is maintained by the accumulator through physical means, specifically, the accumulator includes an accumulator gas injection pipe 320, an accumulator gas storage cavity 340 and an accumulator piston 350, a gas injection port 330 is provided on the accumulator gas injection pipe 320, high-pressure gas is injected through the gas injection port 330 so that the accumulator gas storage cavity 340 is in a high-pressure state, a second end of the accumulator piston 350 is communicated with the core pipe 300, when the core enters the core pipe 300, the pressure in the core pipe 300 rises, the accumulator piston 350 moves toward a first end side of the accumulator piston 350 to compress the volume of the accumulator gas storage cavity 340 so that the internal pressure rises until the pressures at both ends are balanced, and when the pressure in the core pipe 300 falls, the pressure in the accumulator piston 350 moves toward a second end side of the accumulator piston 350 due to the internal pressure in the accumulator gas storage cavity 340 being greater than the pressure in the core pipe 300, and the compression volume stabilizes the pressure in the core pipe 300.
In addition to the above embodiment, in order to facilitate real-time recording and analysis of pressure data during coring, the sensing device 310 further includes a pressure sensor; the sensing device 310 is disposed at an end of the accumulator gas injection pipe away from the accumulator gas storage cavity.
As shown in fig. 1, the sensing device 310 in this embodiment includes a pressure sensor and a temperature sensor, and the temperature sensor and the pressure sensor may be temperature and pressure sensors that integrate pressure and temperature detection functions, or may be respectively disposed in a core barrel. Since the sensing device 310 includes a temperature sensor and a pressure sensor, temperature and pressure data within the core barrel 300 can be detected in real time.
Preferably, in this embodiment, the sensing device 310 is a temperature and pressure sensor, and the temperature and pressure sensor can be disposed at one end of the accumulator gas injection pipe 320 far away from the accumulator gas storage cavity 340, and because the accumulator gas injection pipe 320 is disposed in the core barrel 300 and the accumulator gas injection pipe 320 is communicated with the accumulator gas storage cavity, the temperature and pressure data in the core barrel 300 can be detected more accurately.
On the basis of the above embodiment, the outer wall of the central rod 200 is provided with a conductive copper bar 210, and the stator end of the conductive slip ring 103 is electrically connected with the power supply device through the conductive copper bar 210.
As shown in fig. 1, the conductive copper bar 210 is disposed around the central rod 200, the conductive copper bar 210 is connected with the stator end of the conductive slip ring 103, and a cable interface 220 is further disposed at the first end of the central rod 200, and the conductive copper bar 210 is communicated with an external power supply device through the cable interface 220, so that stable and durable electric energy support is provided for refrigeration of the semiconductor refrigerator 101 through the external power supply device.
It is noted that in other embodiments, a power supply device may be provided within the central rod 200, by which power supply device power is provided for cooling the semiconductor cooler 101. In particular, the power supply may be a lithium battery 230 with a relatively large capacity so as to provide stable and durable power support for the semiconductor refrigerator 101.
On the basis of the above embodiment, the controller includes: the micro-control chip 240 and the battery 230, the battery 230 with micro-control chip 240 electricity is connected, micro-control chip 240 respectively with induction system 310 with electrically conductive sliding ring 103 electricity is connected, the bottom of well core 200 is provided with the mounting hole, battery 230 with micro-control chip 240 all locates the mounting hole, battery 230 is located the hole bottom of mounting hole, the energy storage ware with the inner wall fixed connection of mounting hole.
Specifically, a mounting hole is formed at the bottom end of the center rod 200, a controller is fixedly installed in the mounting hole, the controller comprises a battery 230 and a micro-control chip 240, the battery 230 and the micro-control chip 240 are installed in the mounting hole, and the bottom of the micro-control chip 240 is connected with the sensing device 310 through a wire.
It should be noted that the micro-control chip 240 may also be integrated with a battery, and when the micro-control chip 240 is internally provided with the integrated battery, the central rod 200 does not need to be provided with the battery 230
On the basis of the above embodiment, the controller includes: and the memory is used for storing temperature and pressure data.
Specifically, the controller further comprises a storage, the storage stores temperature and pressure data detected by the sensing device 310, after the corer is lifted to the ground, the corer is in butt joint with external transfer equipment to finish the transportation and storage of the core, the temperature and pressure data of the core are taken out and read by the controller, so that the temperature and pressure information of the core pipe 300 is conveniently collected, and measurement while drilling is realized.
Preferably, the bottom end of the outer tube 100 of the corer is further provided with a rupture disk 160 and a pressure relief opening 170 matched with the rupture disk 160, when the bottom pressure is too high, the rupture disk 160 is broken, the internal pressure is relieved through the pressure relief opening 170, and other parts in the corer can be prevented from being damaged by the high pressure.
Preferably, the top end of the outer tube 100 of the corer is further provided with a spring clip 110, and when coring is required, the core barrel 300 and the outer tube 100 are separated by the shrinkage of the spring clip 110, so that the core barrel 300 is lifted up by the central rod 200. In addition, a pressing ring 120 and a pressing cover 130 are further arranged at the top end of the coring device, the pressing ring 120 is used for limiting the spring clip 110, the overlarge opening angle of the spring clip 110 is avoided, and the pressing cover 130 is used for fixing the pressing ring 120.
In summary, the present application provides a natural gas hydrate heat-preserving and pressure-maintaining corer, which comprises an outer tube 100 and a core tube 300 arranged in the outer tube 100, and is characterized in that the corer further comprises: the energy accumulator is arranged in the rock core pipe 300 and is used for maintaining the constant pressure in the rock core pipe 300; the sensing device 310, the sensing device 310 is arranged in the rock core tube 300; a semiconductor refrigerator 101, wherein the semiconductor refrigerator 101 is arranged on the outer tube 100; a conductive slip ring 103, wherein a stator end of the conductive slip ring 103 is connected with a power supply device, and a rotor end of the conductive slip ring 103 is electrically connected with the semiconductor refrigerator 101; the controller is electrically connected with the induction device 310 and the conductive slip ring 103 respectively, when the pressure in the rock core tube 300 changes, the pressure in the rock core tube 300 is kept constant through the energy accumulator, and when the temperature change is detected, the conductive slip ring 103 is used for transmitting electric energy required by the refrigeration of the semiconductor refrigerator 101, so that the intelligent regulation of the temperature and the pressure in the rock core tube 300 is realized, and the combustible ice in the rock core tube is kept in an in-situ state for a long time (meanwhile, the in-situ temperature and the pressure of the combustible ice rock core are kept, so that the structural and physical properties of the combustible ice rock core are not changed).
The technical principle of the present application is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the application and should not be taken in any way as limiting the scope of the application. Other embodiments of the application will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (8)
1. The utility model provides a natural gas hydrate heat preservation pressurize corer, includes the outer tube and locates core barrel in the outer tube, its characterized in that, the corer still includes:
the energy accumulator is arranged in the rock core pipe and is used for maintaining the constant pressure in the rock core pipe;
the induction device is arranged in the outer tube and comprises a temperature sensor;
the semiconductor refrigerator is arranged on the outer tube; the semiconductor refrigerator is arranged on the inner wall of the outer tube; the semiconductor refrigerators are provided with a plurality of heat insulation pieces, and heat insulation pieces are arranged between every two adjacent semiconductor refrigerators; the semiconductor refrigerator rotates along with the outer tube;
the stator end of the conductive slip ring is connected with a power supply device, the rotor end of the conductive slip ring is electrically connected with the semiconductor refrigerator, the rotor end of the conductive slip ring stands against a stratum in the coring process, and the stator end of the conductive slip ring rotates along with the outer tube of the corer;
the controller is electrically connected with the induction device and the conductive slip ring respectively;
a burst disk located at the bottom of the corer;
the pressure relief opening is positioned at the bottom of the coring device;
the semiconductor refrigerator includes:
the refrigerator refrigerating end faces to one side of the inner wall of the outer tube, the refrigerator heating end faces to one side of the outer wall of the outer tube, and the refrigerator heating end is connected with radiating fins.
2. The natural gas hydrate heat and pressure preserving corer of claim 1, wherein the thickness of the semiconductor refrigerator is greater than the thickness of the insulation.
3. The natural gas hydrate heat-preserving and pressure-maintaining corer as claimed in claim 1, wherein a central rod is arranged in the outer tube, and a valve seat is arranged at the bottom end of the outer tube;
the bottom end of the rock core pipe is in sealing connection with the valve seat, and the top end of the rock core pipe is in sealing connection with the bottom end of the center rod; the energy accumulator is fixedly connected with the bottom end of the central rod.
4. A natural gas hydrate insulated pressure maintaining corer as set forth in claim 3, wherein the accumulator comprises:
the energy storage device comprises an energy storage device gas injection pipe, an energy storage device gas storage cavity and an energy storage device piston, wherein the energy storage device gas injection pipe, the energy storage device gas storage cavity and the energy storage device piston are sequentially arranged along the axial direction of the rock core pipe, the energy storage device gas injection pipe is communicated with the energy storage device gas storage cavity, the first end of the energy storage device piston is communicated with the energy storage device gas storage cavity, and the second end of the energy storage device piston is communicated with the rock core pipe.
5. A natural gas hydrate heat and pressure maintaining corer as set forth in claim 3, wherein the sensing device further comprises a pressure sensor; the induction device is arranged at one end of the energy accumulator gas injection pipe, which is far away from the energy accumulator gas storage cavity.
6. The natural gas hydrate heat-preserving and pressure-maintaining corer as claimed in claim 3, wherein,
the outer wall of the center rod is provided with a conductive copper bar, and the stator end of the conductive slip ring is electrically connected with the power supply device through the conductive copper bar.
7. The natural gas hydrate heat and pressure preserving corer of claim 6, wherein,
the bottom of the center rod is provided with a mounting hole, the controller is arranged in the mounting hole, and the energy accumulator is fixedly connected with the inner wall of the mounting hole.
8. A natural gas hydrate heat and pressure retaining corer as claimed in any one of claims 1 to 7, wherein the controller comprises:
the micro control chip is electrically connected with the sensing device and the conductive slip ring respectively;
and the memory is used for storing temperature and pressure data.
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