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Pressure chamber structure and permeability testing system

A technology of pressure chamber and confining pressure chamber, applied in the field of experimental measurement instruments, can solve problems such as difficulty in realizing bidirectional loading under high pressure conditions, inability to offset the interference of confining pressure, and failure to consider temperature effects.

Pending Publication Date: 2018-12-18
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a pressure chamber structure to solve the problems existing in the existing permeability testing technology that the axial pressure cannot offset the pressure interference caused by the confining pressure, it is difficult to realize bidirectional loading under high pressure conditions, and the temperature effect is not considered. and technical issues in terms of structural complexity
[0008] The purpose of the present invention is also to provide a permeability testing system, which includes the above-mentioned pressure chamber structure, which is used to solve the problems in the prior art that the pressure interference caused by the confining pressure cannot be offset when the axial pressure is loaded, and the Difficult to achieve bidirectional loading under high pressure conditions, no consideration of temperature effects and technical problems in complex structures

Method used

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  • Pressure chamber structure and permeability testing system
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  • Pressure chamber structure and permeability testing system

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Embodiment 1

[0045] figure 1 The first structural schematic diagram of the pressure chamber structure provided by the embodiment of the present invention; figure 2 for figure 1 The magnified image at A in the middle; image 3 Schematic diagram of the structure of the piston rod in the pressure chamber structure provided by the embodiment of the present invention.

[0046] Such as figure 1 As shown, a pressure chamber structure is provided in this embodiment, and the pressure chamber structure includes an axial pressure chamber, a confining pressure chamber and a piston rod 24;

[0047] The axial pressure chamber includes the oil cylinder block 3; the confining pressure chamber includes the upper cover 6 of the confining pressure chamber, the cylinder body 12 and the base 13; the piston rod 24 includes a rod body 241, a first piston 242 and a second piston 243;

[0048] The cylinder block 3 includes a first chamber; the barrel 12 includes a second chamber, a third chamber and a pressur...

Embodiment 2

[0068] Figure 4 It is a schematic diagram of the second structure of the pressure chamber structure provided by the embodiment of the present invention.

[0069] Such as Figure 4 As shown, the pressure chamber structure provided in this embodiment is a further improvement on the pressure chamber structure provided in Embodiment 1, and the technical solution described in Embodiment 1 also belongs to this embodiment. What has been described in Embodiment 1 The technical solution will not be described repeatedly.

[0070] Specifically, as Figure 4 As shown, a pressure chamber structure is provided in this embodiment, which also includes a heat insulating board 27;

[0071] The heat insulation board 27 is arranged between the cylinder block 3 and the upper cover 6 of the confining pressure chamber.

[0072] The current technology does not use the heat shield 27 to separate the confining pressure chamber and the axial pressure chamber of the triaxial pressure chamber to dire...

Embodiment 3

[0074] Such as Figure 5As shown, this embodiment provides a permeability testing system, which includes a pipeline gas path unit, a constant temperature control unit, an acquisition control unit, and the pressure chamber structure;

[0075] The pipeline gas circuit unit is connected to the pressure chamber structure; the collection control unit is connected to the pipeline gas circuit unit;

[0076] The pipeline gas circuit unit is used to test the communication and separation of required fluids; the constant temperature control unit is used to control the temperature of the pipeline gas circuit unit and the pressure chamber structure to be constant; the collection control unit is used to collect and Controlling the pressure information, temperature information and flow information of the pipeline gas circuit unit, the constant temperature control unit and the pressure chamber structure.

[0077] Such as Figure 5 As shown, in the optional solution of this embodiment, the p...

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Abstract

The invention provides a pressure chamber structure and a permeability testing system, and relates to the technical field of experimental measuring instrument. The pressure chamber structure comprisesan axial pressure chamber, a confining pressure chamber and a piston rod; the axial pressure chamber comprises an oil cylinder body and an oil cylinder end cover; the confining pressure chamber comprises a confining pressure chamber upper cover, a cylinder and a base; the piston rod comprises a rod body, a first piston and a second piston; a pressure communication hole and a balance cavity are arranged between the rod body and the cylinder to form a confining pressure self-compensation structure so that the confining pressures acting on both the annular surface of the second piston and the lower end surface of the rod body can be cancelled out, accordingly not interfering loading of the axial pressure and realizing efficient axial pressure loading. The pressure chamber structure solves the technical problems existing in an existing permeability testing technology, such that the pressure interference caused by confining pressure cannot be canceled out during axial pressure loading, bidirectional loading of high-pressure strip pieces is difficult to realize, and the temperature effect and the complex structure are not considered.

Description

technical field [0001] The invention relates to the technical field of experimental measuring instruments, in particular to a pressure chamber structure and a permeability testing system. Background technique [0002] As a basic physical parameter of rock, permeability is very important in evaluating the production of oil and gas fields, the tightness of underground gas storage and nuclear waste disposal, and the fracturing effect of hot dry rock in enhanced geothermal systems. Especially in recent years, with the vigorous exploitation of unconventional oil and gas such as shale oil and gas and tight sandstone oil and gas, and the conduct of reservoir-scale hot dry rock fracturing tests, there is an urgent need for ultra-low permeability rocks such as shale, tight sandstone, and granite. rate for precise measurement. [0003] The permeability test of ultra-low permeability rock is different from conventional high permeability rock. Because ultra-low permeability rocks are ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 张路青李晓周剑李建彬杨多兴王颂
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI