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Automatic continuous testing device and method for coal and rock permeability under non-equilibrium state

A test device and permeability technology, which is applied in the direction of measurement device, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problems of reservoir permeability change, low permeability of sample matrix, and influence on gas production, etc. Achieve the effects of avoiding leakage, suitable for long-term continuous measurement, and ensuring control accuracy

Active Publication Date: 2019-07-30
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coupling effect of gas pressure change and stress caused by drainage will cause a large change in the permeability of the reservoir, thus affecting the gas production rate
[0003] The traditional "static equilibrium experiment" assumes that the measurement state is an equilibrium state when measuring the permeability, ignoring the influence of the gas pressure in the sample changing with the equilibrium time
However, the permeability of the sample matrix is ​​low. It is generally believed that the internal pore pressure can reach equilibrium in 20 to 100 days. The internal coupling effect in the non-equilibrium process will cause a significant change in permeability. There is a dynamic evolution process of permeability, but this process cannot be measured by traditional testing devices and testing methods

Method used

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  • Automatic continuous testing device and method for coal and rock permeability under non-equilibrium state
  • Automatic continuous testing device and method for coal and rock permeability under non-equilibrium state
  • Automatic continuous testing device and method for coal and rock permeability under non-equilibrium state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The simulation test of the gas injection reservoir process includes the following steps:

[0072] ① Process the coal or rock sample into a cylinder with a diameter of 50mm and a height of 100mm, put it in a drying box, and dry it for 24 hours; weigh the sample;

[0073] ②First put the sample into the holder 9 wrapped with the rubber sleeve 10, connect the pipeline to the axial pressure plunger loading pump 1 and the ring pressure plunger loading pump 2, and check the displacement sensor 12, temperature sensor 11, pressure sensor I8, pressure Working state of sensor II13;

[0074] ③ Apply a pressure of 10 MPa to the sample through the axial plunger loading pump 1 and the ring pressure plunger loading pump 2, and check whether there is liquid leakage; set the temperature inside the thermostat 15 to be stable at 25°C, and feed back the data to the data acquisition computer through the temperature sensor 11 16. Automatically adjust the temperature in the incubator 15 throu...

Embodiment 2

[0082] The simulation test of the reservoir gas production process includes the following steps:

[0083] ① Process the coal or rock sample into a cylinder with a diameter of 50mm and a height of 100mm, put it in a drying box, and dry it for 24 hours; weigh the sample;

[0084] ②First put the sample into the holder 9 wrapped with the rubber sleeve 10, and check the working status of the displacement sensor 12, temperature sensor 11, pressure sensor I8, and pressure sensor II13;

[0085] ③Use the axial plunger loading pump 1 and the ring pressure plunger loading pump 2 to apply a pressure of 10 MPa to the sample, and check for liquid leakage; set the temperature in the thermostat 15 to 35°C, and feed back data to the data acquisition computer through the temperature sensor 11 16. Automatically adjust the temperature in the incubator 15 through the data acquisition computer 16 to ensure a constant temperature; close the valve I4, open the valve II6, and after the confining press...

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Abstract

The invention provides an automatic continuous testing device and method for coal and rock permeability under a non-equilibrium state. Axis pressure plunger loading pump is connected with the back endportion of a gripper through pipelines, and the annular pressure plunger loading pump is connected with the side surface of the gripper through the pipelines; a gas cylinder and a vacuum pump of an air pressure control system are connected with one end of an air pressure controller through the pipelines, and the other end of the air pressure controller is connected withafluid flow passage in thefront end of the gripper; a valve II is arranged on a pipeline which connects the vacuum pump with the air pressure controller , a valve I is arranged on a pipeline which connects the gas cylinder with the valve II, and a fluid flow passage at the back end of the gripper is connected with a standard container; and a data acquisition computer is connected with a displacement sensor, a temperature sensor, a pressure sensor I and a pressure sensor II. According to the automatic continuous testing device, automatic measurement and records of a long-term test can be obtained, permeability evolutionrule of pore pressure in samples from the non-equilibrium state to an equilibrium state is effectively measured, a structure is simple and operation is convenient.

Description

technical field [0001] The invention relates to a coal-rock permeability testing device and a method thereof, in particular to an automatic continuous testing device and a method for coal-rock permeability in an unbalanced state, belonging to the technical field of coal-rock mass seepage testing. Background technique [0002] Permeability is an important determinant of unconventional natural gas production, which will induce changes in gas pressure, desorption and stress during the process of natural gas extraction. Due to the characteristics of low porosity and low permeability of unconventional natural gas reservoirs, the reservoir permeability is low, resulting in the pore pressure in the reservoir matrix has been in an unbalanced state. The coupling effect of gas pressure change and stress caused by drainage will cause a large change in the permeability of the reservoir, thus affecting the gas production. [0003] The traditional "static equilibrium experiment" always a...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 魏明尧刘应科
Owner CHINA UNIV OF MINING & TECH
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