Rock core gas/liquid dual-purpose permeability testing device and reservoir damage evaluation method

A testing device and permeability technology, which is applied in the simulation experiment device and evaluation field of the oil and gas development laboratory, can solve the problems of limited application, and achieve the effects of avoiding core damage, saving experiment time, and simple operation

Pending Publication Date: 2017-03-15
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
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  • Claims
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Problems solved by technology

The present invention also provides a new method for accurately measuring the gas-water two-phase effective permeability, although the interference caused by the passage of the test fluid along the gap between the side surface of the rock sample and the sealing sleeve on the test result is eliminated, the measurement of the flow rate of the fluid passing through the core is more accurate Accurate, the permeability calculation results are more reliable, but it is mainly to improve the accuracy, and the application area is still limited

Method used

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  • Rock core gas/liquid dual-purpose permeability testing device and reservoir damage evaluation method

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Experimental program
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Embodiment

[0108] Gas permeability test method and steps:

[0109] 1 Ensure that all switches, control valves and pressure relief valves are closed before the experiment starts.

[0110] 2. Put the core in the visible core holder 12, insert the first plug body 13 and the second plug body 14 to fix it.

[0111] 3. Turn on the first switch 2 to provide air pressure.

[0112] 4. Adjust the confining pressure control valve 16 to apply a certain confining pressure to the rock core.

[0113] 5 Adjust the inlet pressure control valve 4 to a fixed pressure, open the gas storage tank switch 6, the fourth switch 8, the ninth switch 27 and the seventh switch 19, and let the experimental gas pass through the rock core. Adjust the heater 24 to set the experimental temperature.

[0114] 6. The inlet pressure value is read by the second barometer 5, and the outlet gas flow value is read by the gas flow meter 22. The outlet pressure is atmospheric pressure, and the length and cross-sectional area of ​​...

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Abstract

The invention belongs to the technical field of oil-gas development laboratory simulation experiment facilities and evaluation, and particularly relates to a rock core gas/liquid dual-purpose permeability testing device and a reservoir damage evaluation method. The testing device at least comprises a gas-driven sampling device, a visible rock core holder and a gas flowmeter, wherein the gas-driven sampling device comprises a gas-driven gas inlet module and a gas-driven liquid inlet module; the visible rock core holder comprises an inlet end, an outlet end, a first plug body and a second plug body; and the gas flowmeter communicates with a gas outlet pipeline. The method respectively detects the rock core gas permeability K1 and rock core gas permeability K2 subjected to pollution damage by using the device, and calculates the permeability recovery ratio and permeability damage ratio. The technical scheme provided by the invention can simultaneously test the gas permeability and liquid flow permeability of the rock core as well as the permeability recovery degree of the rock core under the pollution of the working fluid. The testing device has the advantages of high simulation degree, ingenious connection, simple structure, high stability and high durability, and is convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of simulation experiment devices and evaluations in oil and gas development chambers, and in particular relates to a rock core gas-liquid dual-purpose permeability testing device and a reservoir damage evaluation method. Background technique [0002] During the development of oil and gas reservoirs, working fluids (such as drilling fluids, completion fluids, fracturing fluids, etc.) often cause damage to the reservoir, resulting in a decrease in the permeability of the reservoir, thereby affecting the increase in oil and gas production. Simulating the pollution process of the working fluid to the reservoir and evaluating the degree of damage to the reservoir permeability have certain guiding and reference significance for oil and gas production and reservoir protection. [0003] In the past, the experimental devices for testing rock core permeability were basically gas permeability testing devices and liquid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 吕帅锋李瑞刘露露肖宇航董庆祥袁铭吕凯谷媛媛李俊阳刘少杰粟冬梅刘盼盼
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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