CN109488241B

CN109488241B - Fidelity coring device

Info

Publication number: CN109488241B
Application number: CN201811495104.9A
Authority: CN
Inventors: 谢和平; 高明忠; 陈领; 李聪; 李存宝; 明传舰
Original assignee: Shenzhen University
Current assignee: Shenzhen University
Priority date: 2018-12-07
Filing date: 2018-12-07
Publication date: 2024-05-14
Anticipated expiration: 2038-12-07
Also published as: CN109488241A

Abstract

The invention provides a fidelity coring device, which comprises an outer barrel and a fidelity cabin, wherein the fidelity cabin is arranged in a hollow cavity of the outer barrel, the outer barrel is used for drilling a core, the fidelity cabin is used for accommodating the core, an energy accumulator is further arranged in the outer barrel and connected with the fidelity cabin, and the energy accumulator is used for pressurizing or depressurizing the fidelity cabin through comparing the detected pressure of the core in the fidelity cabin with the pressure of a coring position so that the pressure in the fidelity cabin is the same as the pressure of the coring position. Through setting up the fidelity cabin to set up the energy storage ware in the urceolus, the energy storage ware can be to the pressure boost or the decompression of fidelity cabin, makes the pressure in the fidelity cabin the same with the pressure of coring department, reaches the pressurize effect.

Description

Fidelity coring device

Technical Field

The invention belongs to the technical field of geological exploration, and particularly relates to a fidelity coring device.

Background

The common core obtained by deep drilling at home and abroad at present releases pressure, temperature, pore water and other components, is severely distorted and is irrelevant to the deep in-situ environment. Scientific research with common cores can lead to the following four problems: 1) Ineffective cores (broken to the surface due to stress relief); 2) The reserve evaluation of the oil and gas resources is distorted, and the measurement inaccuracy is inaccurate; 3) Life bodies (microorganisms, viruses, etc.) that may be present in the deep rock formation die; 4) The physical and mechanical parameters of the rock stratum in real states at different depths can not be measured.

Pressure maintaining is a major problem to be solved.

Disclosure of Invention

The invention aims to provide a fidelity coring device which can realize fidelity coring, in particular to a pressure maintaining effect.

In order to achieve the purpose of the invention, the invention provides the following technical scheme:

The invention provides a fidelity coring device, which comprises an outer barrel and a fidelity cabin, wherein the fidelity cabin is arranged in a hollow cavity of the outer barrel, the outer barrel is used for drilling a core, the fidelity cabin is used for accommodating the core, an energy accumulator is further arranged in the outer barrel and connected with the fidelity cabin, and the energy accumulator is used for pressurizing or depressurizing the fidelity cabin through comparing the detected pressure of the core in the fidelity cabin with the pressure of a coring position so that the pressure in the fidelity cabin is the same as the pressure of the coring position.

The pressure adjusting piece is arranged between the energy accumulator and the fidelity cabin, and the pressure of the fidelity cabin is adjusted by driving the pressure adjusting piece through the energy accumulator so as to keep balance of the pressure of the fidelity cabin.

Wherein the pressure regulating element is a piston, and the energy accumulator is used for providing compressed gas to push the piston or pumping air to pull back the piston; when the pressure in the fidelity cabin is reduced, the energy accumulator provides compressed gas to push the piston, so that the fidelity cabin is compressed and the volume is reduced, and the pressure of the fidelity cabin is kept unchanged; when the pressure of the fidelity cabin rises, the energy accumulator is pumped out to draw back the piston, so that the fidelity cabin is depressurized and the volume is increased, and the pressure of the fidelity cabin is kept unchanged.

The pressure sensor is arranged in the outer barrel and is used for detecting the pressure in the fidelity cabin and feeding back an electric signal of the pressure in real time.

The device comprises a pressure sensor, a pressure accumulator, a pressure sensor, a fidelity coring device and a processing unit, wherein the fidelity coring device comprises the processing unit which receives an electric signal of pressure fed back by the pressure sensor and sends out an instruction to control the pressure accumulator to input compressed gas into the fidelity cabin or suck gas from the fidelity cabin, so that the pressure in the fidelity cabin is the same as the pressure at the coring position.

The energy accumulator is connected with the fidelity cabin through a connecting pipeline, a fourth control valve is arranged on the connecting pipeline, the processing unit is electrically connected with the fourth control valve, and the opening and closing of the fourth control valve are controlled according to the electric signal of the pressure in the fidelity cabin fed back by the pressure sensor in real time.

The fourth control valve is a three-way stop valve, one joint of the fourth control valve is also connected with a pressure relief valve, and the pressure relief valve is used for relieving the gas pressure in the fidelity cabin.

The fidelity cabin is further connected with a fifth control valve through a pipeline, the fifth control valve is connected with a pressure gauge, and the pressure gauge is used for displaying the pressure in the fidelity cabin in real time.

The outer cylinder is further provided with a sealing piece, the sealing piece is provided with an elastic sheet, and after the fidelity cabin completely enters the hollow cavity of the outer cylinder, the sealing piece is driven to pop out by the elastic sheet, so that the sealing piece seals the space of the hollow cavity of the outer cylinder to form a sealing space.

The sealing structure is arranged on the side face of the sealing piece in a surrounding mode, and when the sealing piece is in a sealing state of the outer cylinder, the sealing structure on the side face of the sealing piece is clung to the inner wall of the outer cylinder.

According to the fidelity coring device provided by the invention, the fidelity cabin is arranged, and the energy accumulator is arranged in the outer barrel, so that the energy accumulator can pressurize or depressurize the fidelity cabin, the pressure in the fidelity cabin is the same as the pressure at the coring position, and the pressure maintaining effect is achieved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of the modularity of the cross-sectional structure of the structure of a fidelity coring device of one embodiment;

FIG. 2 is a schematic cross-sectional view of a fidelity coring device of an embodiment.

FIG. 3 is a schematic structural view of a closure of an embodiment;

FIG. 4 is a schematic structural view of an inner barrel of an embodiment;

FIG. 5 is a schematic diagram of a control portion of a fidelity coring of an embodiment.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, an embodiment of the present invention provides a fidelity coring device, which includes an outer barrel 10, an inner barrel 20 and a fidelity capsule 30, wherein the inner barrel 20 is accommodated in a hollow cavity of the outer barrel 10, and the fidelity capsule 30 is disposed in the inner barrel 20.

Referring to fig. 1 and 2, the end of the outer cylinder 10 is provided with a drill bit 11, and the drill bit 11 is used to excavate the inside of soil or rock and obtain a core. The end of the inner cylinder 20 on the same side as the outer cylinder 10 may also be provided with a drill for performing fine cutting processing on the core obtained by drilling the outer cylinder 10, so that the core is formed into a predetermined shape, such as a cylindrical shape, so as to be received in the fidelity capsule 30. The outer barrel 10 and the inner barrel 20 can relatively move, and the moving direction is along the axial direction of the outer barrel 10, so that the drill bits of the outer barrel 10 and the inner barrel 20 can cut at different times, and the coring efficiency is quickened. In order to maintain the drilling temperature of the drill bit 11 in a normal range, a coolant flow passage may be further provided in the gap between the outer cylinder 10 and the inner cylinder 20 for cooling the drill bit 11.

The fidelity coring device provided by the embodiment of the invention aims to obtain the core which is the same as the actual environment of the original position of the soil or rock and the like, so that the basis can be provided for the subsequent study of the property of the soil or rock at the position. The research on the core obtained by the fidelity coring device provided by the embodiment of the invention can be applied to the fields of oil gas resource detection, geological structure analysis, deep microorganism research and the like.

Further, "fidelity" of the fidelity coring device provided by the embodiment of the present invention may include heat preservation, pressure maintaining, quality guarantee, moisture preservation, or light preservation, etc., that is, the obtained core may be consistent with the temperature, pressure, composition, humidity, or luminous flux of the soil or rock at the in-situ location of coring.

Referring to fig. 1, the fidelity module 30 may be a space of a hollow cavity of the inner barrel 20, or may be a separate barrel structure disposed in the hollow cavity of the inner barrel 20, where the barrel structure has a cavity for accommodating a core.

In one embodiment, referring to fig. 1 and 2, the fidelity capsule 30 is integrally disposed in the outer barrel 10, a sealing member 3 may be disposed on the outer barrel 10, and during coring, the sealing member 3 is opened to allow a core to extend into the cavity of the fidelity capsule 30 through the outer barrel 10, and the sealing member 3 seals the outer barrel 10 after the core completely enters the fidelity capsule 30, so that the fidelity capsule 30 is accommodated in the hollow cavity of the sealed outer barrel 10.

In one embodiment, the Fidelity pod 30 is integrally disposed within the inner barrel 20, and the closure 3 may be disposed on the inner barrel 20. During coring, the closure 3 is opened to allow a core to extend through the inner barrel 20 into the cavity of the Fidelity pod 30. After the core has completely entered the Fidelity pod 30, the closure 3 closes the inner barrel 20 such that the Fidelity pod 30 is received within the hollow cavity of the closed inner barrel 20.

In one embodiment, a sealing member 3 may be further disposed on the fidelity capsule 30, and when the drill bit of the outer barrel 10 or the inner barrel 20 drills the core, the sealing member 3 is opened until the core completely enters the fidelity capsule 30, and the sealing member 3 seals the fidelity capsule 30, so that the core is accommodated in the sealed cavity of the fidelity capsule 30.

The closure 3 of the above embodiment may take a suitable configuration. Taking an embodiment in which the outer cylinder 10 is provided with the sealing member 3 as an example, referring to fig. 3, the sealing member 3 may be a flap structure, and when the outer cylinder 10 is in an open state, the sealing member 3 is attached to an inner wall of the outer cylinder 3; when the outer cylinder 10 is in the closed state, the closing member 3 is ejected from the inner wall of the outer cylinder 3 to close the outer cylinder 10. The sealing piece 3 can be provided with a structure such as a spring piece 31 for driving the sealing piece 3 to move, the spring piece 31 is arranged on the surface of one side of the sealing piece 3, which is opposite to the inner cylinder 20, and when the sealing piece 3 is attached to the inner wall of the outer cylinder 3, the spring piece 31 is in a compressed structure; when it is necessary to close the outer cylinder 10, the elastic release of the elastic piece 31 ejects the closing piece 3 to close the outer cylinder 10. The closing member 3 rotates under the elastic action of the elastic sheet 31, and as shown in fig. 3, the closing member 31 is attached to the outer cylinder 3, and when the closing member 31 rotates, the closing member 31 rotates around the center of the circle at the lower end of the closing member 31 shown in fig. 3, and the rotation angle is 90 degrees, so that the structure of the closing member 3 shown in fig. 2 is finally formed. In one embodiment, when the sealing element 3 is attached to the inner wall of the outer cylinder 3, the elastic piece 31 abuts against the inner wall of the outer cylinder 3, and due to the relative movement between the inner cylinder 20 and the outer cylinder 10, the inner cylinder 20 can have an abutting force on the sealing element 3 to limit the elastic piece 31 of the sealing element 3 to be in a compressed state; when the inner cylinder 20 moves to a specific position, the inner cylinder 20 gradually moves away from the closure member 3, so that the closure member 3 loses the restriction of the inner cylinder 20, and the elastic sheet 31 can release elasticity, so that the closure member 3 ejects to close the outer cylinder 10, and automatic ejection of the closure member 3 is realized. In one embodiment, the release of the elastic sheet 31 of the closure member 3 is automatically controlled by other means, for example, an electric release structure is arranged on the elastic sheet 31, the electric release structure can be an electrically controlled spring, two ends of the spring are connected to the elastic sheet 31, and the spring is released when the power is applied to release the pressure (or the tension) on the elastic sheet 31; the electric release mechanism maintains a compressive (or tensile) force on the dome 31 when the power is off, so that the dome 31 maintains a compressed state. The electric release structure may include a power source, a switch and a position sensor, the position sensor is disposed on the outer barrel 10 and is used for sensing whether the core has completely entered the fidelity capsule 30, if yes, the switch is closed to be electrified, the pressure (or the pulling force) on the elastic sheet 31 is released, the elastic force of the elastic sheet 31 drives the sealing member 3 to move, so as to seal the outer barrel 10, and the control of the electric release structure may be controlled by adopting a processing unit 100. In other embodiments, the closure 3 may be of other types of construction.

In one embodiment, in order to enable the closure member 3 to be effectively closed, taking the case that the closure member 3 is disposed on the inner wall of the outer cylinder 10 as an example, a circle of sealing structure, such as a sealing ring, may be enclosed on the side surface of the closure member 3. When the sealing piece 3 is in a state of sealing the outer barrel 10, the side face of the sealing piece 3 is attached to the inner wall of the outer barrel 10, and a circle of sealing structure is arranged, so that the sealing piece 3 can be in contact with the outer barrel 10 more tightly, and the sealing effect is better.

Referring to fig. 1 and 2, a first liquid storage device 40 and a second liquid storage device 50 are disposed in the outer barrel 10, liquid is filled in the first liquid storage device 40 and the second liquid storage device 50, the first liquid storage device 40 and the second liquid storage device 50 are communicated with the fidelity capsule 30 through structures such as pipelines, so that the liquid can enter the fidelity capsule 30, the liquid in the first liquid storage device 40 and the liquid in the second liquid storage device 50 can perform mass transfer function in the fidelity capsule 30, further phase change is generated, and finally a layer of protective film is formed on the peripheral surface of the rock core so as to ensure that the components, humidity and the like of the rock core are consistent with those of the soil or rock components and humidity of the original position of the core, and a fidelity effect is achieved.

Specifically, the liquid stored in the first liquid storage device 40 is a liquid a, the liquid stored in the second liquid storage device 50 is a liquid B, and the liquid a can be specifically a dripping film forming agent, such as a solution formed by mixing polysulfone and DMF (N, N-DimethylformamideN, N-dimethylformamide); the solution B can be water or ethanol solution. The mass transfer principle is that the solvent in the solution A is more soluble in the solution B, the solute in the solution A can be separated, and the two liquids are mixed and solidified into a film to form a layer of sealing film for wrapping the rock core.

Referring to fig. 1,2 and 4, taking the core accommodated in the inner cavity of the inner barrel 20 as an example (i.e. the fidelity capsule 30 is a hollow cavity of the inner barrel 20), a flow channel 22 is disposed inside the sidewall of the inner barrel 20, and the flow channel 22 surrounds the top wall and the peripheral sidewall of the inner barrel 20. The inner wall of the inner cylinder 20 is also provided with a plurality of wall holes 23, the plurality of wall holes 23 are uniformly distributed on the peripheral side wall of the inner cylinder 20, and of course, the wall holes 23 can also be distributed on the top wall. The wall aperture communicates the flow passage 22 with the hollow cavity of the inner barrel 20. The inner cylinder 20 is also provided with a liquid inlet 24, the liquid inlet 24 is provided with a first control valve 25, and the first control valve 25 can control the opening and closing of the liquid inlet 24. The liquid inlet 24 is preferably formed on the top wall of the inner cylinder 20, and the liquid inlet 24 is communicated with the outside and the flow channel 22, at this time, the liquid can flow downwards under the action of gravity after entering the liquid inlet 24 to fill the flow channel 22, and flows into the hollow cavity of the inner cylinder 20 from the wall hole 23. The first reservoir 40 and the second reservoir 50 are both connected to the inlet 24 by a pipe such that both liquid a and liquid B can flow into the hollow cavity of the inner barrel 20 through the inlet 24. Preferably, the liquid a and the liquid B do not flow into the liquid inlet 24 at the same time, but flow into the liquid inlet in sequence, that is, the position where the mass transfer effect of the liquid a and the liquid B occurs and the phase change occurs is not generated in the flow channel 22, but in the hollow cavity of the inner barrel 20, and the core is accommodated in the hollow cavity of the inner barrel 20, so that the mass transfer effect of the liquid a and the liquid B occurs on the surface of the core and the phase change occurs, and a protective film wrapping the core is formed, and the protective film can isolate the external environment condition, so that the components, humidity, luminous flux and the like of the core are kept the same as those of the soil or the rock and the like at the coring position.

In an embodiment, referring to fig. 2 and 4, the first liquid reservoir 40 is disposed at the top of the inner cylinder 20, and the first liquid reservoir 40 and the liquid inlet 24 on the inner cylinder 20 are disposed adjacently. The second liquid reservoir 50 is disposed above the first liquid reservoir 40, the second liquid reservoir 50 is connected to the liquid inlet 23 through a pipe, and a second control valve 51 may be disposed on the pipe, where the second control valve 51 is used to control whether the B liquid flows to the liquid inlet 24.

Referring to fig. 1 and 2, in one embodiment, a third reservoir 60 is disposed in the outer barrel 10, and the third reservoir 60 is used for storing a coolant, such as liquid nitrogen, for cooling the inner barrel 20, and thus the fidelity capsule 30, and finally cooling the core. The heater 12 is arranged on the periphery of the inner barrel 20, the heater 12 can be, for example, a resistance wire, and the heater 12 can heat the inner barrel 20, further heat the fidelity capsule 30 and finally heat the rock core. Also provided within the outer barrel 10 is a temperature sensor 4, the temperature sensor 4 being used to detect the temperature of the core in the fidelity capsule 30 and also to detect the temperature of the soil or rock at the coring site during drilling. The function of maintaining the original temperature condition is achieved by comparing the temperature in the capsule 30 with the temperature of the soil or rock at the coring site and by adjusting by means of the third reservoir 60 releasing the coolant for cooling or heating by the heater 12 so that the temperature in the capsule 30 is the same as the temperature of the soil or rock at the coring site.

Specifically, referring to fig. 1 and 2, the third liquid reservoir 60 is disposed above the second liquid reservoir 50, the third liquid reservoir 60 is connected to the outer wall of the inner cylinder 20 through a pipe, and the periphery of the outer wall of the inner cylinder 20 may be provided with a meshed capillary channel, so that the inner cylinder 20 can be uniformly cooled after the coolant enters the capillary channel. Similarly, the heater 12 provided around the outer wall of the inner tube 20 may have a net-like structure, so that the inner tube 20 can be heated uniformly. To avoid shorting, the heater 12 surface is coated with an insulating layer. In one embodiment, the heater 12 may also be provided on the inner wall of the outer cartridge 10. The temperature sensor 4 is disposed on the outer cylinder 10 at a position close to the outlet of the lower end portion of the inner cylinder 20 and is located inside the outer cylinder 10 after the closure 3 is closed, so as to approach the fidelity capsule 30 and not to block the movement of the inner cylinder 20 relative to the outer cylinder 10.

Referring to fig. 1 and 2, in one embodiment, an accumulator 70 is further disposed in the outer barrel 10, the accumulator 70 is connected to the fidelity capsule 30, and the accumulator 70 is used to pressurize or depressurize the fidelity capsule 30 so that the pressure in the fidelity capsule 30 is the same as the pressure at the coring site. Specifically, a pressure regulator (not shown) is disposed between the accumulator 70 and the fidelity capsule 30, and the pressure regulator is driven by the accumulator 70 to regulate the pressure of the fidelity capsule 30, so that the pressure of the fidelity capsule 30 is balanced. The pressure regulating member may be, for example, a piston, and the accumulator 70 may provide compressed gas to push the piston, or to pump air back to the piston. When the pressure in the chamber 30 drops, the accumulator 70 provides compressed gas to push the piston, which can make the chamber 30 compressed and the volume reduced, so as to keep the pressure of the chamber 30 unchanged. When the pressure in the fidelity cabin 30 rises, the accumulator is pumped to draw back the piston, so that the fidelity cabin 30 is depressurized and the volume is increased, and the pressure of the fidelity cabin 30 is kept unchanged. The outer barrel 10 is also provided with a pressure sensor 5, and the pressure sensor 5 is used for detecting the pressure in the fidelity cabin 30 and also can be used for detecting the pressure of soil or rock at the coring position. When the core contains a significant amount of moisture (or liquid component), the pressure herein is referred to as osmotic pressure. The function of maintaining the original pressure condition is achieved by comparing the pressure in the capsule 30 with the pressure of the soil or rock at the coring site and adjusting by means of the accumulator 70 adjusting the pressure adjusting member so that the pressure in the capsule 30 is the same as the pressure of the soil or rock at the coring site.

Specifically, referring to FIG. 2, the accumulator 70 is disposed at an upper portion of the inner barrel 20, preferably above the third reservoir 60. The pressure regulating member may be disposed in a space between the inner cylinder 20 and the accumulator 70. In one embodiment, referring to fig. 1 and 2, the pressure sensor 5 may be disposed on the outer cylinder 10 near the outlet of the lower end of the inner cylinder 20 and inside the outer cylinder 10 after the closure 3 is closed to access the fidelity chamber 30 without blocking the movement of the inner cylinder 20 relative to the outer cylinder 10. In another embodiment, the pressure sensor 5 is disposed on the top wall of the fidelity capsule 30 (or the inner barrel 20) and can be directly contacted with the core.

The above embodiments describe a fidelity approach to coring soil or rock, and the principles of the embodiments of the present invention may also be used when large volumes of liquids or gases are involved, such as in the detection of oil or gas. The difference is that the fidelity capsule 30 requires better sealing when properly tuned for the composition of the core, e.g., oil or gas is detected, oil is the liquid, and gas is the gas. When the components, humidity and luminous flux are maintained, the liquid A and the liquid B can not be in direct contact with the rock core, and the formed protective film can be wrapped on the outer wall of the fidelity capsule 30.

Referring to fig. 2, in order to reduce friction between the core and the inner wall of the fidelity capsule 30, a lubrication element is further disposed on the inner wall of the fidelity capsule 30, and the lubrication element in this embodiment may be a graphene layer structure.

Referring to fig. 5 in combination with fig. 1 and 2, the control portion of the fidelity coring device of the present invention includes a processing unit 100, a power source 200, connecting wires and various valves. The processing unit 100 has a preset program, and the preset program can issue specific instructions according to needs. Specifically, the processing unit 100 may be a PLC board provided in the outer tub 10 or an electronic computer provided in a human activity area, or the like. The power supply 200 supplies power to the processing unit 100 and the heater 12, and connection lines are connected between the processing unit 100 and the respective valves for transmitting instructions of the processing unit 100. After receiving the instruction from the processing unit 100, the valve performs an action of opening or closing the valve, thereby realizing the fidelity function described in the above embodiment.

Specifically, a third control valve 61 is disposed on a pipeline connecting the third liquid storage 60 and the fidelity cabin 30, a fourth control valve 71 is disposed on a pipeline connecting the accumulator 70 and the fidelity cabin 30, and the third control valve 61 and the fourth control valve 71 are electric control valves. The processing unit 100 is electrically connected to a power supply 200, a temperature sensor 4, a pressure sensor 5, a first control valve 25, a second control valve 51, a third control valve 61, and a fourth control valve 71.

A switch 201 is provided on a connection line between the power supply 200 and the heater 12, and the control unit 100 controls the switch 201 to be turned on and off, and the switch 201 is used for turning on and off the power supply 200 to heat or not heat the heater 12.

The first control valve 25 and the second control valve 51 are electric control valves, when the rock core completely enters the fidelity cabin 30, the outer barrel 10 is closed by the sealing piece 3, the processing unit 100 controls the first control valve 25 to be opened, the liquid A in the first liquid reservoir 40 enters the fidelity cabin 30, then the processing unit 100 controls the second control valve 51 to be opened, the liquid B in the second liquid reservoir 50 enters the fidelity cabin 30, the liquid A and the liquid B perform mass transfer effect and then phase change, a protective film is formed to cover the rock core, and isolation of the rock core and the external environment is realized.

The temperature sensor 4, the pressure sensor 5 and the processing unit 100 can be electrically connected in a wireless manner, so that a communication function is realized.

The temperature sensor 4 transmits an electrical signal of the temperature in the fidelity capsule 30 to the processing unit 100, and the processing unit 100 determines that the temperature of the fidelity capsule 30 needs to be raised or lowered according to the temperature in the fidelity capsule 30 compared with the temperature of the soil or rock at the coring site. Further, if a temperature rise is required, the processing unit 100 controls the switch 201 to be closed, and the heater 12 heats the fidelity capsule 30 until the temperature of the fidelity capsule 30 is the same as the temperature of the soil or rock at the coring site. If cooling is required, the processing unit 100 controls the third control valve 61 to open, and the coolant in the third reservoir 60 flows to the fidelity capsule 30 and takes away the heat of the fidelity capsule 30, so as to cool until the temperature of the fidelity capsule 30 is the same as the temperature of the soil or rock at the coring site. In the heating and cooling process, the temperature sensor 4 may feed back the temperature of the fidelity cabin 30 to the processing unit 100 in real time, so that the instruction of the processing unit 100 for controlling heating or cooling is updated in real time, so as to reduce the error.

The pressure sensor 5 transmits an electrical signal of the pressure within the capsule 30 to the processing unit 100, and the processing unit 100 determines that the capsule 30 needs to be pressurized or depressurized based on the temperature within the capsule 30 as compared to the pressure of the soil or rock at the coring site. Further, if pressurization is required, the processing unit 100 controls the fourth control valve 71 to open, compression control in the accumulator 70 enters the fidelity capsule 30, and pressurizes the core until the pressure in the fidelity capsule 30 is the same as the pressure of the soil or rock at the coring site. If depressurization is needed, the fourth control valve 71 is closed, a pressure release valve 72 is further arranged on a pipeline connected between the accumulator 70 and the fidelity capsule 30, the pressure release valve 72 is an electric control valve, the processing unit 100 controls the pressure release valve 72 to be opened, and gas in the fidelity capsule 30 is discharged through the pressure release valve 72 through the pipeline until the pressure of the fidelity capsule 30 is the same as the pressure of soil or rock at the coring position. In the pressurization or depressurization process, the pressure sensor 5 may feed back the pressure of the fidelity cabin 30 to the processing unit 100 in real time, so that the instruction of the processing unit 100 for controlling pressurization or depressurization is updated in real time, so as to reduce the error.

The first control valve 25, the second control valve 51, the third control valve 61 and the fourth control valve 71 may be shut-off valves, wherein the fourth control valve 71 may be a three-way shut-off valve, and one joint of the fourth control valve 71 is connected to the relief valve 72.

In order to observe the pressure in the fidelity cabin 30 in real time, a fifth control valve 15 may be further provided and connected to the fidelity cabin 30, the fifth control valve 15 may also be a three-way stop valve, one interface of which is connected with a pressure gauge 151, the pressure gauge 151 is arranged at a position that can be observed by a person, the pressure gauge 151 can display the pressure in the fidelity cabin 30 in real time, so that the person can observe the pressure change of the fidelity cabin 30 conveniently, and the pressure in the fidelity cabin 30 is prevented from being inconsistent with the actual pressure caused by faults of the pressure sensor 5, the fourth control valve 71 or the accumulator 70.

The opening degree of each valve can be adjusted according to the requirement, so that the temperature, pressure or mass transfer phase change rate is different.

The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.

Claims

1. The fidelity coring device is characterized by comprising an outer barrel and a fidelity cabin, wherein the fidelity cabin is arranged in a hollow cavity of the outer barrel, the outer barrel is used for drilling a core, the fidelity cabin is used for accommodating the core, an energy accumulator is further arranged in the outer barrel and connected with the fidelity cabin, and the energy accumulator is used for pressurizing or depressurizing the fidelity cabin through comparing the detected pressure of the core in the fidelity cabin with the pressure of a coring position so that the pressure in the fidelity cabin is the same as the pressure of the coring position;

be equipped with first reservoir and second reservoir in the urceolus, first reservoir with the second reservoir pass through the pipeline with the fidelity cabin is connected, the first reservoir is interior to be stored with A liquid, be equipped with B liquid in the second reservoir, A liquid with B liquid is in the fidelity intracavity mixes and takes place mass transfer effect, and then produces the phase transition, and in the surface formation one deck protection film around the rock core, the protection film makes the rock core is kept apart with external environment.

2. A fidelity coring device as set forth in claim 1 further comprising a pressure adjustment member disposed between said accumulator and said fidelity capsule, said pressure adjustment member being driven by said accumulator to adjust the pressure of said fidelity capsule to maintain the pressure of said fidelity capsule in balance.

3. A fidelity coring device as claimed in claim 2 wherein said pressure adjustment member is a piston and said accumulator is adapted to provide compressed gas to push said piston or to bleed air to pull said piston back; when the pressure in the fidelity cabin is reduced, the energy accumulator provides compressed gas to push the piston, so that the fidelity cabin is compressed and the volume is reduced, and the pressure of the fidelity cabin is kept unchanged; when the pressure of the fidelity cabin rises, the energy accumulator is pumped out to draw back the piston, so that the fidelity cabin is depressurized and the volume is increased, and the pressure of the fidelity cabin is kept unchanged.

4. A fidelity coring device as claimed in any one of claims 1 to 3 wherein a pressure sensor is provided in said outer barrel, said pressure sensor being adapted to detect the pressure in said fidelity capsule and to feed back an electrical signal of the pressure in real time.

5. A fidelity coring device as set forth in claim 4 wherein said fidelity coring device comprises a processing unit that receives an electrical signal of pressure fed back by said pressure sensor and issues instructions to control said accumulator to input compressed gas into or extract gas from said fidelity chamber such that the pressure in said fidelity chamber is the same as the pressure at said coring site.

6. A fidelity coring device as set forth in claim 5 wherein a connecting conduit is provided between said accumulator and said fidelity chamber, a fourth control valve is provided on said connecting conduit, said processing unit is electrically connected to said fourth control valve and controls the opening and closing of said fourth control valve based on an electrical signal of the pressure in said fidelity chamber fed back in real time by said pressure sensor.

7. A fidelity coring apparatus as set forth in claim 6 wherein said fourth control valve is a three-way shut-off valve, one of said fourth control valve's joints further being connected to a pressure relief valve for relieving the pressure of gas in said fidelity capsule.

8. A fidelity coring apparatus as claimed in claim 1 wherein said fidelity capsule is further connected by tubing to a fifth control valve, said fifth control valve being connected to a pressure gauge for displaying the pressure in said fidelity capsule in real time.

9. A fidelity coring device as in claim 1 wherein said outer barrel is further provided with a closure member, said closure member being provided with a spring, said spring driving said closure member to eject when said fidelity capsule is fully within said hollow cavity of said outer barrel, such that said closure member closes said hollow cavity of said outer barrel in a closed space.

10. A fidelity coring device as claimed in claim 9 wherein a ring of sealing structure is provided around the side of said closure, said sealing structure on the side of said closure being in close proximity to the inner wall of said outer barrel when said closure is in a condition in which said outer barrel is closed.