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High-temperature ultralow permeability measuring instrument

An ultra-low permeability, measuring instrument technology, applied in permeability/surface area analysis, measuring devices, scientific instruments, etc., can solve the problems of high temperature and ultra-low permeability measurement and high manufacturing costs, and achieve low development costs and reliability. High performance and simple overall structure

Active Publication Date: 2014-03-19
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing literature and patent searches show that there are many test equipment for measuring low permeability and even ultra-low permeability, but no one can measure high-temperature ultra-low permeability well.
At the same time, due to the relatively high manufacturing cost of existing ultra-low permeability measurement equipment, there is an urgent need for a high-temperature ultra-low permeability measurement instrument that is simple to manufacture, low in cost, and accurate in measurement.

Method used

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Examples

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Embodiment 1

[0020] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0021] A high-temperature ultra-low permeability measuring instrument ( figure 1 ), which consists of triaxial pressure chamber, displacement sensor 11, hydrostatic pressure loading pump 13 and bias loading pump 12, constant current / constant pressure control pump 14, small volume gas storage tank 15, medium volume gas storage tank 16, large volume It is composed of gas storage tank 17, pore pressure sensor 19, upstream and downstream pore pressure deviation sensor 20, oil pressure sensor 21, temperature sensor 23, high temperature control box 22, and data acquisition system 24 and other components. The connection relationship is: the triaxial pressure chamber is connected to the hydrostatic pressure loading pump 13 and the bias loading pump 12 respectively through the oil pipeline, and is connected to the constant flow / constant pressure control pump 14 through the gas...

experiment example 1

[0028] The equipment was used to measure the permeability of mudstone. The test plan was to apply a hydrostatic pressure of 12MPa to a cylindrical sample with a height of 76mm and a diameter of 38mm. The temperature was controlled at 60°C, and then the permeability was measured. The test results show that it takes 15 minutes for the temperature to be loaded from room temperature to 60°C, the temperature of the whole system is constant at 60.2°C, the temperature fluctuation is less than 0.2°C, the hydrostatic pressure is loaded, and the constant flow / constant pressure control pump (ISCO 500D) is used Pressurize the air storage tank of the smallest container, and then implement pulse measurement. After 12 hours, the system pressure is stable, and the measured permeability is 10 -22 m 2 .

[0029] For accurate measurements, the device is leak tested. For a metal sample with a diameter of 38mm and a height of 76mm, the pulse method is used to conduct a penetration test to observ...

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Abstract

The invention discloses a high-temperature ultralow permeability measuring instrument. A triaxial pressure chamber is connected with a hydrostatic pressure loading pump, a bias pressure loading pump and a constant current / voltage control pump respectively, wherein the triaxial pressure chamber is arranged in a high-temperature control box, while the hydrostatic pressure loading pump, the bias pressure loading pump and the constant current / voltage control pump are placed outside the high-temperature control box. The triaxial pressure chamber comprises a base, an axial piston and an oil cylinder outer wall, wherein the axial piston penetrates through the top of the triaxial pressure chamber which is internally provided with two miniature pressurizing chambers; one pressurizing chamber is connected with a side pressure oil inlet through a self-balancing connecting pipe, the side pressure oil inlet passes through the oil cylinder outer wall and is connected with the hydrostatic pressure loading pump, and the other pressurizing chamber is connected with the bias pressure loading pump through an axial pressure oil inlet. The measuring instrument is simple in structure, convenient to use, high in measuring precision, capable of measuring the low permeability under the conditions of different temperature and stress, and very suitable for measuring the permeability of low-permeability rock-soil mediums involved by unconventional oil-gas fields, energy storage and nuclear waste underground storage engineering.

Description

technical field [0001] The invention relates to the technical field of experimental measuring instruments, and more specifically relates to a high-temperature ultra-low permeability measuring instrument, which provides a reliable, accurate and simple measuring device for the ultra-low permeability rock-soil medium permeability measurement. The equipment can be used for underground storage of high radioactive nuclear waste, measurement of permeability characteristics of surrounding rock media such as shale gas and coalbed methane under different temperature conditions. Background technique [0002] In recent years, in order to solve the plight of my country's increasing energy demand, my country is actively developing unconventional oil and gas fields, including shale gas and coalbed methane. A major feature of these oil and gas fields is their ultra-low permeability, usually lower than 10 -19 m 2 . Accurately measuring the permeability of oil and gas reservoirs is very im...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 杨典森陈卫忠杨建平
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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