CN114660263B - Shale gas content measuring device - Google Patents
Shale gas content measuring device Download PDFInfo
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- CN114660263B CN114660263B CN202210224227.9A CN202210224227A CN114660263B CN 114660263 B CN114660263 B CN 114660263B CN 202210224227 A CN202210224227 A CN 202210224227A CN 114660263 B CN114660263 B CN 114660263B
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- box body
- inner cavity
- shale
- clamp
- gas content
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/02—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder
- G01N7/04—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder by absorption or adsorption alone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
Abstract
The application provides a shale gas content measuring device, including box, positioning fixture, pretension subassembly, axle load subassembly, constant temperature subassembly and evacuation subassembly. The box body is internally provided with an inner cavity and is externally connected with a sealing cover; the positioning fixture is arranged in the box body and comprises an upper fixture and a lower fixture, and the adjacent end surfaces of the upper fixture and the lower fixture are provided with arc-shaped grooves; the pre-tightening assembly is used for connecting the upper clamp and the lower clamp; the axle pressure loading assembly is arranged in the box body, and the constant temperature assembly and the vacuumizing assembly are arranged on the box body and are communicated with the inner cavity. When the device is used, a shale sample is loaded into the positioning fixture, and the upper fixture and the lower fixture are clamped through the pre-tightening assembly, so that the shale sample is subjected to radial pressure; clamping the shale sample by using an axial pressure loading assembly to enable the shale sample to be subjected to axial pressure; the temperature in the inner cavity is controlled by the constant temperature component, and the environmental simulation of the shale underground is realized. The application provides a shale gas content measuring device can effectively simulate different stratum environments, has ensured the degree of accuracy of shale gas content measuring result.
Description
Technical Field
The application belongs to the technical field of shale gas exploitation, and particularly relates to a shale gas content measuring device.
Background
Shale gas is a natural gas resource which is stored in a shale layer and can be exploited, belongs to an important supplement of conventional energy, and development and utilization of the shale gas are beneficial to relieving shortage of oil and gas resources and increasing clean energy supply.
Shale gas is usually present in shale rich in organic matters and an interlayer thereof, is unconventional natural gas taking adsorption and free states as main existing modes, mainly contains methane as a component, belongs to clean and efficient energy resources and chemical raw materials, and is mainly used in the fields of resident gas, urban heat supply, power generation, automobile fuel, chemical production and the like.
The shale gas content is a key parameter for investigation and evaluation of shale gas resource potential and optimization of a favorable target area, and has important significance for determining whether the shale gas has exploitation value and resource reserve prediction, so that the shale matrix gas content needs to be evaluated before exploitation, and particularly the shale gas content in an adsorption state is measured.
The currently common method for measuring the gas content of shale is a desorption method, and the basic process comprises the following steps:
sampling shale, and polishing to form a cylindrical shale sample; and (2) filling the shale sample into a desorption tank, filling the gap of the desorption tank with fine quartz sand, sealing, and then putting into a constant temperature device for simulating the formation temperature to allow the shale sample to be naturally desorbed.
The inventors have found that the packing of fine-grained quartz sand does not effectively simulate the environment of shale in the formation, resulting in a decrease in the accuracy of the shale gas content measurements.
Disclosure of Invention
The embodiment of the application provides a shale gas content measuring device, aims at solving the technical problem that the accuracy of shale gas content measuring result is reduced because the existing measuring equipment can not accurately simulate different stratum environments.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
the utility model provides a shale gas content measuring device includes:
the box body is provided with an inner cavity with an upward opening, and a sealing cover for sealing the inner cavity is detachably connected with the box body;
the positioning fixture is arranged in the box body and used for clamping the shale sample along the radial direction of the shale sample so that the axial direction of the shale sample is parallel to the front-back direction of the box body; the positioning clamp comprises an upper clamp and a lower clamp which are arranged along the vertical direction, the lower clamp and the upper clamp are suitable for mutually abutting, abutting surfaces are made of aluminum materials, and the positioning clamp is provided with an arc-shaped groove which can be matched with the shale sample;
the pre-tightening assembly is connected with the upper clamp and the lower clamp so as to drive the upper clamp and the lower clamp to move towards or away from each other, so that the shale sample is clamped or loosened in the radial direction;
the axial compression loading assembly is arranged in the box body and used for clamping or loosening the shale sample along the axial direction;
the constant temperature component is arranged on the box body and used for emitting temperature outwards so as to ensure that the temperature in the inner cavity is constant; and
and the vacuumizing assembly is arranged on the box body, is communicated with the inner cavity and is used for pumping gas out of the inner cavity so as to enable the inner cavity to be in a vacuum state.
In one possible implementation manner, the upper clamp and the lower clamp both adopt a structure with a triangular vertical section; when the upper clamp and the lower clamp are mutually abutted, the vertical section is rectangular; the pretensioning assembly comprises:
the two sliding pieces are arranged at intervals along the left and right directions of the box body, and each sliding piece is connected to the inner bottom wall of the inner cavity in a sliding manner along the left and right directions of the box body; the adjacent side surfaces of the two sliding parts are provided with clamping grooves, and the clamping grooves are suitable for the upper clamp and the lower clamp to be embedded;
two driving rods respectively connected to the two sliding members; the axial direction of each driving rod is arranged along the left-right direction and penetrates through the box body and extends out; the protruding part of the driving rod is provided with a connecting plate extending outwards in the radial direction; and
the double-end screw is rotationally connected to the lower surface of the box body, and the rotational axial direction of the double-end screw is parallel to the left and right directions of the box body; the double-thread screw has two screw thread portions with opposite thread directions, and the two screw thread portions are respectively in threaded connection with the two connecting plates and are used for driving the two connecting plates to move in opposite directions or move in opposite directions, so that the driving rod drives the two sliding parts to move in opposite directions or move in opposite directions.
In a possible implementation manner, the bottom surface of the box body is provided with a rotating motor, and the power output axial direction of the rotating motor is parallel to the axial direction of the double-head screw; a transmission belt is arranged between the rotating motor and the double-headed screw, and the transmission belt is wound on the power output shaft of the rotating motor and the periphery of the double-headed screw;
when the rotating motor is started, a power output shaft of the rotating motor drives the double-end screw to rotate through the transmission belt.
In a possible implementation manner, the lower clamp is fixedly connected to the inner bottom wall of the inner cavity, and the upper surface of the lower clamp is provided with a slot; the upper clamp is provided with a plug connector extending from top to bottom, and the plug connector is suitable for being inserted into the slot to guide the lifting direction of the upper clamp and limit the upper clamp to move relative to the lower clamp.
In one possible implementation, the axial compression loading assembly includes:
the two lifting seats are respectively arranged on the inner walls of the front side and the rear side of the inner cavity in a sliding manner, and the sliding direction is arranged along the up-down direction; and
the two linear cylinders are respectively and fixedly connected to the adjacent side surfaces of the two lifting seats, and the power output shafts are parallel to the front and back directions of the box body; the power output end of the linear air cylinder is provided with a connecting ring used for wrapping the end part of the shale sample.
In one possible implementation, the thermostatic assembly includes:
the heat preservation pipe is positioned in the inner cavity, the pipe body is fixed on the front side surface of the inner cavity through a connecting element, and two ends of the heat preservation pipe penetrate through the rear side surface of the inner cavity and extend out of the box body;
the thermostat is fixedly connected to the rear side face of the box body, is connected with one end of the heat preservation pipe and is used for heating liquid; and
and the circulating pump is fixedly connected to the rear side face of the box body and is connected with the output end of the thermostat and the other end of the heat preservation pipe.
In one possible implementation, the connecting element includes:
the two vertical rods are arranged in the inner cavity and are used for being abutted against the inner annular wall of the ring body formed by the heat preservation pipe so as to tighten the heat preservation pipe; and
the four cross rods are respectively arranged on the two vertical rods, so that each vertical rod is provided with two cross rods; the two cross rods on each vertical rod are distributed along the vertical direction and are used for being abutted against the heat insulation pipe so as to limit the heat insulation pipe to move along the vertical direction;
the transverse rod penetrates through the vertical rod along the front-back direction of the box body, a flange plate suitable for being abutted against the transverse rod is arranged at one end of the transverse rod, a bent part extending outwards along the radial direction is arranged at the other end of the transverse rod, and a through hole penetrating along the axial direction of the transverse rod is formed in the bent part;
the front side surface of the inner cavity is provided with a plurality of thread grooves which are arranged at intervals along the left and right directions of the box body and are suitable for being communicated with the through holes, connecting bolts are arranged between the front side surface of the inner cavity and each cross rod and are suitable for penetrating through the through holes and being communicated with any one of the thread grooves.
In one possible implementation, the vacuum pumping assembly includes:
the vacuum pump is fixedly connected to the box body; and
and one end of the exhaust pipe is communicated with the vacuum pump, and the other end of the exhaust pipe penetrates through the bottom surface of the box body and extends into the inner cavity.
In one possible implementation manner, the shale gas content measuring apparatus further includes:
the inflation element is fixedly connected to the front side surface of the box body, is communicated with the inner cavity and is used for inflating gas into the inner cavity;
and the inflation element is connected with a first gas storage tank for containing helium and a second gas storage tank for containing methane.
In the embodiment of the application, the upper clamp and the lower clamp are matched, so that the shale sample can be limited along the radial direction of the shale sample.
When the gas content of the shale is measured, the upper clamp and the lower clamp are clamped through the pre-tightening assembly, so that the shale sample is subjected to radial pressure; clamping the shale sample by using an axial pressure loading assembly to enable the shale sample to be subjected to axial pressure; the temperature in the inner cavity is controlled by using the constant temperature component, so that the temperature environment simulation of the shale underground is realized; and the gas in the inner cavity is pumped out by utilizing the vacuumizing assembly, so that the gas simulation of the shale underground is realized, and no adsorbed gas on the surface of the shale is ensured.
By adjusting the magnitude of the radial pressure, the magnitude of the axial pressure and the temperature, the simulation of different formation environments can be realized.
Compared with the prior art, the shale gas content measuring device provided by the embodiment can effectively simulate different stratum environments, ensures the accuracy of shale gas content measuring results, and improves the reliability of experimental results obtained by the device.
Drawings
Fig. 1 is a schematic perspective view of a shale gas content measuring apparatus according to an embodiment of the present disclosure;
fig. 2 is a second schematic perspective view of the shale gas content measuring apparatus according to the embodiment of the present disclosure (for convenience of showing the structure in the inner cavity, the sealing cover is hidden);
FIG. 3 is an enlarged view of a portion of FIG. 2 taken along circle A;
FIG. 4 is a bottom view of FIG. 2;
FIG. 5 is a schematic perspective view of a thermostatic assembly used in an embodiment of the present application;
FIG. 6 is an exploded view of a connecting element used in an embodiment of the present application;
FIG. 7 is an exploded view of a positioning fixture, a pre-tightening assembly and a shaft loading assembly used in an embodiment of the present application;
FIG. 8 is an enlarged partial view taken at circle B of FIG. 7;
FIG. 9 is an exploded view of a positioning fixture used in an embodiment of the present application;
description of reference numerals:
1. a box body; 11. an inner cavity; 111. a thread groove; 12. sealing the cover; 13. rotating the motor; 131. a transmission belt; 2. positioning a clamp; 21. an upper clamp; 211. a plug-in unit; 22. a lower clamp; 221. a slot; 23. an arc-shaped slot; 3. a pre-tightening assembly; 31. a slider; 311. a clamping groove; 32. a drive rod; 321. a connecting plate; 33. a double-ended screw; 4. a shaft pressure loading assembly; 41. a lifting seat; 42. a linear cylinder; 421. a connecting ring; 5. a constant temperature component; 51. a heat preservation pipe; 52. a thermostat; 53. a circulation pump; 6. a vacuum pumping assembly; 61. a vacuum pump; 62. an air exhaust pipe; 7. a connecting element; 71. a vertical rod; 72. a cross bar; 721. a flange plate; 722. a bending section; 7221. a through hole; 8. a connecting bolt; 9. an inflation element; 91. a first gas storage tank; 92. a second gas tank; 100. a shale sample.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1 to 9 together, a shale gas content measuring apparatus provided by the present application will now be described. The shale gas content measuring device is used for measuring the gas content of a cylindrical shale sample 100 and structurally comprises a box body 1, a positioning clamp 2, a pre-tightening assembly 3, an axial compression loading assembly 4, a constant temperature assembly 5 and a vacuumizing assembly 6.
The case 1 has an inner cavity 11 opened upward, and a cover 12 for closing the inner cavity 11 is detachably attached to the top of the case 1.
The positioning jig 2 is disposed in the casing 1 and is used for clamping the shale sample 100 in a radial direction of the shale sample 100, so that an axial direction of the shale sample 100 is parallel to a front-back direction of the casing 1.
The positioning jig 2 includes an upper jig 21 and a lower jig 22.
Wherein, the upper clamp 21 and the lower clamp 22 are arranged in the inner cavity 11 along the up-down direction, and the lower clamp 22 and the upper clamp 21 are adapted to abut against each other, and the abutting surfaces are made of aluminum material, and the surface of the aluminum layer is provided with an arc-shaped groove 23 capable of adapting to the shale sample 100.
It should be noted that the surface made of aluminum material has a better adaptability, and can adapt to the grinding error of the shale sample 100, so as to ensure that the radial pressure can be stably applied to the shale sample 100, thereby enhancing the stability.
The pre-tightening assembly 3 is used to connect with the upper clamp 21 and the lower clamp 22 to drive the upper clamp 21 and the lower clamp 22 to move towards or away from each other, so as to radially clamp or release the shale sample 100, so that the shale sample 100 receives a stable radial pressure.
The axial compression loading assembly 4 is disposed in the box body 1 and is used for clamping or loosening the shale sample 100 along the axial direction, so that the shale sample 100 receives stable axial compression force.
The thermostatic assembly 5 is arranged on the box body 1 and used for emitting temperature outwards to ensure that the temperature in the inner cavity 11 is constant, so that a more comprehensive underground environment is simulated.
The vacuumizing assembly 6 is arranged on the box body 1, is communicated with the inner cavity 11 and is used for vacuumizing the gas in the inner cavity 11 so as to enable the inner cavity 11 to be in a vacuum state; the inner cavity 11 in the vacuum state is also part of the environmental simulation, and the role of the inner cavity also includes forming an initial environment to ensure that the shale sample 100 does not adsorb other substances, and avoid errors.
In the embodiment of the application, the upper clamp 21 and the lower clamp 22 are matched, so that the shale sample 100 can be limited along the radial direction of the shale sample.
When the gas content of the shale is measured, the upper clamp 21 and the lower clamp 22 are clamped through the pre-tightening assembly 3, so that the shale sample 100 is subjected to radial pressure; clamping the shale sample 100 by using the axial compression loading assembly 4 to enable the shale sample 100 to be subjected to axial pressure; the temperature in the inner cavity 11 is controlled by the constant temperature component 5, so that the stable environment simulation of the shale underground is realized; the gas in the inner cavity 11 is pumped out by the vacuum pumping assembly 6, so that the gas state simulation of the shale underground is realized, and no adsorbed gas on the surface of the shale is ensured.
By adjusting the magnitude of the radial pressure, the magnitude of the axial pressure and the temperature, the simulation of different formation environments can be realized.
And then, inflating gas (such as methane) into the inner cavity 11 by using the prior art, and measuring the gas content of the shale sample 100, so that an accurate measurement result of the gas content of the shale sample 100 can be obtained.
Compared with the prior art, the shale gas content measuring device provided by the embodiment can effectively simulate different stratum environments, ensures the accuracy of shale gas content measuring results, and improves the reliability of experimental results obtained by the device.
In some embodiments, the features described above for the upper clamp 21, the lower clamp 22 and the pretensioning assembly 3 can be configured as shown in fig. 7. Referring to fig. 7, the upper jig 21 and the lower jig 22 each have a structure having a triangular vertical cross section, and when the upper jig 21 and the lower jig 22 are abutted against each other, the vertical cross section is rectangular.
The pretensioning assembly 3 comprises two sliders 31, two drive rods 32 and a double-threaded screw 33.
Two sliders 31 are provided at intervals in the left-right direction of the case 1, and each slider 31 is slidably connected to the inner bottom wall of the inner cavity 11 in the left-right direction of the case 1.
The adjacent sides of the two sliders 31 each have a clamping groove 311, and the clamping grooves 311 are adapted to be fitted with the upper and lower clamps 21 and 22.
The two driving rods 32 are respectively connected to the two sliding pieces 31; the axial direction of each driving rod 32 is arranged along the left-right direction and penetrates through the box body 1 and extends out; the protruding portion of the drive rod 32 has a connecting plate 321 extending radially outward.
The double-thread screw 33 is rotationally connected to the lower surface of the box body 1, and the rotational axial direction is parallel to the left and right direction of the box body 1; the double-thread screw 33 has two thread portions with opposite thread directions, and the two thread portions are respectively in threaded connection with the two connecting plates 321, and are used for driving the two connecting plates 321 to move towards each other or move away from each other, so as to drive the two sliding members 31 to move towards each other or move away from each other through the driving rod 32.
Through adopting above-mentioned technical scheme, realize the process to shale sample 100 loading radial pressure, and this process only need rotate double threaded screw 33 and realize, and the actual operation of being convenient for has improved the reliability of this device.
In some embodiments, the above-mentioned features can be adopted between the box body 1 and the double-threaded screw 33 as shown in fig. 4. Referring to fig. 4, the bottom surface of the case 1 is provided with a rotary motor 13, and the power output axis of the rotary motor 13 is parallel to the axis of the double-headed screw 33.
A belt 131 is provided between the rotary motor 13 and the double-headed screw 33, and the belt 131 is wrapped around the power output shaft of the rotary motor 13 and the outer periphery of the double-headed screw 33.
When the rotating motor 13 is started, the power output shaft of the rotating motor 13 rotates the double-headed screw 33 through the transmission belt 131.
By adopting the technical scheme, when the rotating motor 13 is started, the power output shaft of the rotating motor drives the double-threaded screw 33 to rotate through the transmission belt 131, so that the automatic driving that the two sliding parts 31 move back to back or move oppositely is realized, and the reliability and the execution efficiency of the device in actual use are improved; meanwhile, the rotating motor 13 has a self-locking function, the shale sample 100 is clamped by the combined structure of the upper clamp 21 and the lower clamp 22, when the shale sample 100 is subjected to predicted radial pressure, the position can be limited by the self-locking function of the rotating motor 13, the two sliding pieces 31 are prevented from moving back to loosen the upper clamp 21 and the lower clamp 22, and the reliability of the device in the detection process is improved.
In some embodiments, the above features may be employed between the lower clamp 22 and the upper clamp 21 as shown in fig. 8 and 9. Referring to fig. 8 and 9, the lower clamp 22 is fixedly connected to the inner bottom wall of the inner cavity 11, and the upper surface of the lower clamp 22 has a slot 221.
The upper jig 21 has a plug 211 extending from top to bottom, and the plug 211 is adapted to be inserted into the slot 221 to guide the ascending and descending direction of the upper jig 21 and to restrict the movement of the upper jig 21 with respect to the lower jig 22.
Through adopting above-mentioned technical scheme, the integrated configuration of slot 221 and plug connector 211 can inject the moving direction of last anchor clamps 21, avoids going up anchor clamps 21 horizontal displacement simultaneously and causes the dislocation to arrange, ensures that last anchor clamps 21 and lower anchor clamps 22 can stabilize centre gripping shale sample 100, has improved the reliability of this device when in-service use.
In some embodiments, the above-described characteristic axial compression loading assembly 4 may be configured as shown in fig. 7. Referring to fig. 7, the axial compression loading assembly 4 includes two lifting bases 41 and two linear air cylinders 42.
The two lifting seats 41 are respectively arranged on the inner walls of the front side and the rear side of the inner cavity 11 in a sliding manner, and the sliding direction is arranged along the up-down direction.
Two linear cylinders 42 are respectively and fixedly connected to the adjacent side surfaces of the two lifting seats 41, and the power output axial direction is parallel to the front and back direction of the box body 1.
The power output end of the linear cylinder 42 has a connection ring 421 for wrapping around the end of the shale sample 100.
In practical use, the lifting seat 41 is first moved to align the connection ring 421 with the shale sample 100; then the connection ring 421 is sleeved on the end of the shale sample 100; finally, the two linear air cylinders 42 are simultaneously activated, so that the shale sample 100 is subjected to a pressing force along the axial direction.
Through adopting above-mentioned technical scheme, realize the automatic extrusion along the axial to shale sample 100, and through the drive power of adjustment straight line cylinder 42, can effectively simulate different axle load environment, improved the reliability of this device when simulating the environment.
It should be added that the simultaneous start of the two linear cylinders 42 can be realized by a PLC system, and the PLC system can also be connected to the above-mentioned rotating electric machine 13, so as to ensure the reliability of the simultaneous start.
In some embodiments, the above-described feature thermostatic assembly 5 may adopt a structure as shown in fig. 2 and 5. Referring to fig. 2 and 5, the thermostat assembly 5 includes a thermal insulation pipe 51, a thermostat 52, and a circulation pump 53.
The heat preservation pipe 51 is arranged in the inner cavity 11, the pipe body is fixed on the front side surface of the inner cavity 11 through the connecting element 7, and two ends of the pipe body penetrate through the rear side surface of the inner cavity 11 and extend out of the box body 1.
The thermostat 52 is fixedly connected to the rear side of the cabinet 1, is connected to one end of the heat-insulating tube 51, is used for heating liquid, and has a temperature measuring module and a heating module, and the use principle thereof is the same as that of the thermostat 52 in the prior art.
The circulating pump 53 is fixedly connected to the rear side surface of the case 1, and is connected to the output end of the thermostat 52 and the other end of the thermal insulation pipe 51.
By adopting the technical scheme, hot water circulates along the inner part of the heat preservation pipe 51, so that the internal temperature of the inner cavity 11 is ensured to be at a constant value, and the reliability of underground environment simulation through the device is improved; compared with other heating modes, the device has better stability, avoids heating the outer side of the box body 1, and reduces the influence on the environment temperature.
In some embodiments, the above-described feature connecting element 7 may adopt a structure as shown in fig. 3 and 6. Referring to fig. 3 and 6, the connecting element 7 comprises two vertical bars 71 and four transverse bars 72.
The two vertical rods 71 are arranged in the inner cavity 11 and are used for being abutted against the inner annular wall of a ring body formed by the heat preservation pipe 51 so as to tighten the heat preservation pipe 51, and the cross section of the heat preservation pipe 51 is U-shaped; the vertical rod 71 has upper and lower ends respectively located above and below the insulating tube 51.
Four cross bars 72 are respectively provided on the two vertical bars 71 so that there are two cross bars 72 on each vertical bar 71, and the two cross bars 72 are respectively connected to the upper and lower ends of the vertical bar 71.
Each of the vertical rods 71 is adapted to abut against the thermal insulation pipe 51 to restrict the thermal insulation pipe 51 from moving in the up-down direction.
The connection mode of the vertical rod 71, the cross rod 72 and the box body 1 comprises:
the cross bar 72 is disposed through the vertical bar 71 along the front-rear direction of the box 1, one end of the cross bar 72 has a flange 721 adapted to abut against the cross bar 72, the other end of the cross bar 72 has a bent portion 722 extending radially outward, and the bent portion 722 has a through hole 7221 axially penetrating along the cross bar 72.
The front side surface of the inner cavity 11 is provided with a plurality of thread grooves 111 which are arranged at intervals along the left and right direction of the box body 1 and are suitable for being communicated with the through holes 7221, a connecting bolt 8 is arranged between the front side surface of the inner cavity 11 and each cross rod 72, and the connecting bolt 8 is suitable for penetrating through the through holes 7221 and being communicated with any one thread groove 111.
The two cross bars 72 distributed up and down are on the same plumb surface, and the distance between the two cross bars 72 distributed left and right can be adjusted by connecting the through hole 7221 with different thread grooves 111.
By adopting the technical scheme, the connecting bolt 8 is communicated with one thread groove 111, passes through the through hole 7221 and is aligned to the thread groove 111; subsequently, the connecting bolt 8 is screwed, so that the bending part 722 is attached to the inner side wall of the inner cavity 11, the fixing of the heat preservation pipe 51 is completed, the cross section of the heat preservation pipe 51 is ensured not to change, and the structural stability of the device is improved.
In some embodiments, the vacuum assembly 6 described above may be configured as shown in FIG. 4. Referring to fig. 4, the evacuation assembly 6 includes a vacuum pump 61 and an evacuation tube 62.
The body of the vacuum pump 61 is fixedly connected to the box body 1, specifically, to the bottom surface of the box body 1, wherein the vacuum pump 61 is a pump body which is common in the prior art, and the use principle thereof is not described herein.
One end of the exhaust tube 62 is communicated with the vacuum pump 61, and the other end penetrates through the bottom surface of the box body 1 and extends into the inner cavity 11.
By adopting the technical scheme, the vacuum pump 61 is started to suck out the gas in the inner cavity 11 through the exhaust tube 62, so that a vacuum environment is formed, and the reliability of the device in actual use is improved.
It should be noted that, in the present embodiment, the exhaust pipe 62 has a filter therein for adsorbing dust and impurities, so as to avoid accumulation of excessive impurities in the vacuum pump 61.
In some embodiments, the side of the box 1 may be configured as shown in fig. 2. Referring to fig. 2, an inflation member 9 is fixedly connected to a front side surface of the case 1, and the inflation member 9 is communicated with the inner cavity 11 for inflating the inner cavity 11 with gas.
Further, a first gas tank 91 for containing helium gas and a second gas tank 92 for containing methane gas are connected to the inflation element 9.
When measuring the adsorption capacity of the shale sample 100, firstly, the vacuumizing assembly 6 is used for vacuumizing, helium gas is filled into the inner cavity 11 through the gas filling element 9 and the first gas storage tank 91 (only enters a free space because the helium gas is not adsorbed), and then the vacuumizing is carried out; subsequently, the gas charging element 9 and the second gas container 92 are used to charge methane into the inner cavity 11, part of methane in the inner cavity 11 is adsorbed, and the adsorbed gas amount is obtained by subtracting the two.
Through adopting above-mentioned technical scheme, realize filling into of helium and methane, ensure that the absorption tolerance can effectively be reachd, improved the stability of this device when in actual use to and the reliability of obtaining the result.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (6)
1. Shale gas content measuring device for survey cylindric shale sample, its characterized in that shale gas content measuring device includes:
the box body is provided with an inner cavity with an upward opening, and a sealing cover used for sealing the inner cavity is detachably connected with the box body;
the positioning fixture is arranged in the box body and used for clamping the shale sample along the radial direction of the shale sample so that the axial direction of the shale sample is parallel to the front-back direction of the box body; the positioning clamp comprises an upper clamp and a lower clamp which are arranged along the vertical direction, the lower clamp and the upper clamp are suitable for mutual abutting, abutting surfaces are made of aluminum materials, and the positioning clamp is provided with an arc-shaped groove which can be matched with the shale sample;
the pre-tightening assembly is connected with the upper clamp and the lower clamp so as to drive the upper clamp and the lower clamp to move towards or away from each other, so that the shale sample is clamped or loosened in a radial direction;
the axial compression loading assembly is arranged in the box body and is used for clamping or loosening the shale sample along the axial direction;
the constant temperature component is arranged on the box body and used for emitting temperature outwards so as to ensure that the temperature in the inner cavity is constant; and
the vacuumizing assembly is arranged on the box body, communicated with the inner cavity and used for pumping gas out of the inner cavity so as to enable the inner cavity to be in a vacuum state;
the upper clamp and the lower clamp both adopt structures with triangular vertical sections; when the upper clamp and the lower clamp are mutually abutted, the vertical section is rectangular; the pretensioning assembly comprises:
the two sliding pieces are arranged at intervals along the left and right directions of the box body, and each sliding piece is connected to the inner bottom wall of the inner cavity in a sliding manner along the left and right directions of the box body; the adjacent side surfaces of the two sliding parts are provided with clamping grooves, and the clamping grooves are suitable for the upper clamp and the lower clamp to be embedded;
two driving rods respectively connected to the two sliding members; the axial direction of each driving rod is arranged along the left-right direction and penetrates through the box body and extends out; the protruding part of the driving rod is provided with a connecting plate extending outwards in the radial direction; and
the double-end screw is rotationally connected to the lower surface of the box body, and the rotational axial direction of the double-end screw is parallel to the left and right directions of the box body; the double-threaded screw is provided with two threaded parts with opposite thread directions, and the two threaded parts are respectively in threaded connection with the two connecting plates and are used for driving the two connecting plates to move oppositely or reversely so as to drive the two sliding parts to move oppositely or reversely through the driving rod;
the bottom surface of the box body is provided with a rotating motor, and the power output axial direction of the rotating motor is parallel to the axial direction of the double-head screw; a transmission belt is arranged between the rotating motor and the double-headed screw, and the transmission belt is wound on the power output shaft of the rotating motor and the periphery of the double-headed screw;
when the rotating motor is started, a power output shaft of the rotating motor drives the double-end screw to rotate through the transmission belt;
the axle pressure loading assembly comprises:
the two lifting seats are respectively arranged on the inner walls of the front side and the rear side of the inner cavity in a sliding manner, and the sliding direction is arranged along the up-down direction; and
the two linear cylinders are respectively and fixedly connected to the adjacent side surfaces of the two lifting seats, and the power output shafts are parallel to the front and back directions of the box body; the power output end of the linear air cylinder is provided with a connecting ring used for wrapping the end part of the shale sample.
2. The shale gas content measuring device of claim 1, wherein the lower clamp is fixedly connected to an inner bottom wall of the inner cavity, and an upper surface of the lower clamp is provided with a slot; the upper clamp is provided with a plug connector extending from top to bottom, and the plug connector is suitable for being inserted into the slot to guide the lifting direction of the upper clamp and limit the upper clamp to move relative to the lower clamp.
3. The shale gas content measuring apparatus of claim 1, wherein the thermostatic assembly comprises:
the heat preservation pipe is positioned in the inner cavity, the pipe body is fixed on the front side surface of the inner cavity through a connecting element, and two ends of the heat preservation pipe penetrate through the rear side surface of the inner cavity and extend out of the box body;
the thermostat is fixedly connected to the rear side face of the box body, is connected with one end of the heat preservation pipe and is used for heating liquid; and
and the circulating pump is fixedly connected to the rear side face of the box body and is connected with the output end of the thermostat and the other end of the heat preservation pipe.
4. The shale gas content measurement apparatus of claim 3, wherein the connection element comprises:
the two vertical rods are arranged in the inner cavity and are used for being abutted against the inner annular wall of the ring body formed by the heat preservation pipe so as to tighten the heat preservation pipe; and
the four cross rods are respectively arranged on the two vertical rods, so that each vertical rod is provided with two cross rods; the two cross rods on each vertical rod are distributed along the vertical direction and are used for being abutted against the heat insulation pipe so as to limit the heat insulation pipe to move along the vertical direction;
the transverse rod penetrates through the vertical rod along the front and back directions of the box body, a flange plate which is suitable for being abutted against the transverse rod is arranged at one end of the transverse rod, a bent part which extends outwards along the radial direction is arranged at the other end of the transverse rod, and a through hole which penetrates through the transverse rod along the axial direction is formed in the bent part;
the front side surface of the inner cavity is provided with a plurality of thread grooves which are arranged at intervals along the left and right directions of the box body and are suitable for being communicated with the through holes, connecting bolts are arranged between the front side surface of the inner cavity and each cross rod and are suitable for penetrating through the through holes and being communicated with any one of the thread grooves.
5. The shale gas content measuring apparatus of claim 1, wherein the evacuation assembly comprises:
the vacuum pump is fixedly connected to the box body; and
and one end of the air exhaust pipe is communicated with the vacuum pump, and the other end of the air exhaust pipe penetrates through the bottom surface of the box body and extends into the inner cavity.
6. The shale gas content measurement apparatus of any of claims 1-5, further comprising:
the inflation element is fixedly connected to the front side surface of the box body, is communicated with the inner cavity and is used for inflating gas into the inner cavity;
and the inflation element is connected with a first gas storage tank for containing helium and a second gas storage tank for containing methane.
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