Device and method for measuring gasometry permeability of rock under high pressure

Abstract

The invention provides a device and a method for measuring the gasometry permeability of rock under high pressure and belongs to the field of exploration and development of oil fields. The method comprises the following steps of: firstly, sampling gas reservoir rock and testing the rock sample by using test gas to acquire the permeating quantity of the rock sample to the test gas under the high pressure and pressure of the test gas at the moment; secondly, measuring the viscosity of the test gas under different pressure at experimental temperature to acquire a relational expression between the viscosity and the pressure of the test gas; and finally, processing the data to acquire the gasometry permeability of the rock under the high pressure. A process and the method for measuring the gasometry permeability of the rock under high pressure are established; furthermore, by analysis of the property of the gas under the high pressure, a method for processing the data of the gasometry permeability of the rock under the appropriate high pressure can be implemented; under the condition like that of high-pressure gas reservoir stratum, the gasometry permeability of the rock under the high pressure can be obtained more accurately; and data support is supplied to the development of high-pressure gas reservoir.

Description

technical field [0001] The invention belongs to the field of exploration and development of oil and gas fields, and in particular relates to a device and a method for measuring the gas permeability of rock under high pressure. Background technique [0002] In addition to the ability to store oil and gas, an oil and gas reservoir must also allow oil and gas to seep through rocks under pressure, which is a necessary condition for the development of oil and gas reservoirs. Rock permeability is the measure of the fluid's ability to percolate through the rock. [0003] In 1856, French engineer Darcy used artificial sand bodies to study the percolation of water, thus establishing Darcy's law. Currently Darcy's formula has the following two forms: [0004] Darcy's formula for liquid measured permeability: [0005] Darcy's formula for gas permeability: [0006] In the formula, k is the rock permeability, Q is the flow rate of liquid, Q 0 is the gas flow rate under atmospher...

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Problems solved by technology

[0008] When conducting gas reservoir flow experiments, the pressure of gas reservoirs is usually relatively high, especially in abnormally high-pressure gas reservoirs. Usually, the formation pressure is higher than 100 MPa. The original gas permeability method cannot simulate the formation conditions. The obtained permeability The permeability of rocks is quite different from that under real formation conditions; the properties of gas have changed greatly under high pressure, the compressibility of gas under high pressure is very small, and the compressibility of gas can be ignored. The main difference between the permeability formula and the liquid permeability formula is that the compressibility of gas is considered; the original gas permeability method does not consider the influence of pressure on gas viscosity in the formula because the pressure is relatively small, but the gas viscosity under high pressure change cannot be ignored

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