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Device and method for measuring effective porosity of low-permeability rock on basis of inert gas experiment

A technology of effective porosity and inert gas, which is applied in the direction of measuring devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problems of large error in porosity measurement and unstable results, and achieve high test accuracy, The effect of short experimental period and simple calculation method

Inactive Publication Date: 2014-03-26
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a low-permeability rock effective porosity measurement device and method based on an inert gas experiment, which overcomes the problems of large porosity measurement errors and unstable results in the past

Method used

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  • Device and method for measuring effective porosity of low-permeability rock on basis of inert gas experiment
  • Device and method for measuring effective porosity of low-permeability rock on basis of inert gas experiment
  • Device and method for measuring effective porosity of low-permeability rock on basis of inert gas experiment

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Experimental program
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Effect test

Embodiment 1

[0034] 1. Select the natural low-permeability rock-Late Proterozoic granite gneiss, process the rock sample into a cylindrical shape, measure the diameter and height, and calculate the volume of the rock sample V ;

[0035] 2. After the rock sample is covered with high-performance rubber, put it into the pressure chamber 1, and adjust the position of the sample to make it balanced;

[0036] 3. Turn on the confining pressure control device 3 to apply the confining pressure to the predetermined value and then close it, so that the confining pressure is continuously stable at the predetermined value;

[0037] 4. Close the first valve, open the second to fifth valves to connect all the pipelines with the outside atmosphere, leave it for a period of time until the gas inside the instrument is discharged, and calibrate the high-precision pressure gauge 5 to 0;

[0038] 5. Close the second, fourth and fifth valves, open the first and third valves, and open the air pressure loading s...

Embodiment 2

[0051] 1. Select the natural low-permeability rock-Cretaceous lamprophyre, process the rock sample into a cylindrical shape, measure the diameter and height, measure and calculate the volume of the rock sample V ;

[0052] 2. After the rock sample is covered with high-performance rubber, put it into the pressure chamber 1, and adjust the position of the sample to make it balanced;

[0053] 3. Turn on the confining pressure control device 3 to apply the confining pressure to the predetermined value and then close it, so that the confining pressure is continuously stable at the predetermined value;

[0054] 4. Close the first valve, open the second to fifth valves to connect all the pipelines with the outside atmosphere, leave it for a period of time until the gas inside the instrument is discharged, and calibrate the high-precision pressure gauge 5 to 0;

[0055] 5. Close the second, fourth and fifth valves, open the first and third valves, and open the air pressure loading sy...

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Abstract

The invention discloses a device and method for measuring the effective porosity of a low-permeability rock on the basis of an inert gas experiment. The device comprises a pressure chamber (1), an air pressure loading system (2), a confining pressure loading system (3), the to-be-measured low-permeability rock (4) and a high-precision pressure gauge (5) which are communicated through a communicating pipeline, wherein the to-be-measured low-permeability rock (4) is placed in the pressure chamber (1); the air pressure loading system (2) loads air pressure to the upper and lower surfaces of the to-be-measured low-permeability rock (4); the high-precision pressure gauge (5) is used for measuring the air pressure in the communicating pipeline; the confining pressure loading system (3) loads confining pressure to the periphery of the to-be-measured low-permeability rock (4). According to the method, after air pressure loading, the high-precision pressure gauge is used for measuring pressure changes of inert gas so as to derive the effective porosity of the rock sample under different confining pressure. The device has the advantages that the operation is simple, the range of confining pressure measured in the experiment is wide, the measuring accuracy is high, the experiment period is short, and the final result is easy to convert.

Description

technical field [0001] The invention relates to a device and method for measuring the effective porosity of low-permeability rocks based on an inert gas experiment. Background technique [0002] Low-permeability rock is the main medium and geological environment for underground oil and gas storage, CO2 storage, shale gas storage, and nuclear waste disposal. It is also a common complex medium in the construction of water conservancy and hydropower, mines, and tunnels. The size of the effective porosity of low-permeability rock directly determines the structure and permeability of rock, so its accurate measurement is very important for the study of rock structure and permeability. [0003] At present, there are usually three methods for measuring effective porosity: laboratory methods, indirect methods based on various downhole testing technologies, such as gas porosity meter, nuclear magnetic resonance well technology, etc. Obtain the surface porosity of the rock sample slic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 王环玲徐卫亚左婧贾朝军王伟
Owner HOHAI UNIV
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