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

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...

AI Technical Summary

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

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