Apparatus for measuring permeability of low permeation rock core, and method thereof

Abstract

The invention belongs to the field of petroleum engineering, and concretely relates to an experiment apparatus for measuring the permeability of a low permeation rock core, and a method thereof. The apparatus for measuring the permeability of the low permeation rock core comprises an inlet end pressure cap, an outlet end pressure cap, a curing glue sleeve, a carbon oxide gas bottle, a glass funnel, a first scale, a vacuum pump, a polyfluortetraethylene pipe and a second scale, and three ports of a first tee joint are respectively connected with the outlet of the inlet end pressure cap, the carbon dioxide gas bottle and the glass funnel through pipelines and valves; the glass funnel is vertically arranged, and one side of the glass funnel is vertically provided with the first scale; and three ports of a second tee joint are respectively connected with the outlet of the outlet end pressure cap, the vacuum pump and the polyfluortetraethylene pipe through pipelines and valves, the polyfluortetraethylene pipe is horizontally fixed, the polyfluortetraethylene pipe, a tested rock core and the axis of the first tee joint are in a same horizontal line, and one side of the polyfluortetraethylene pipe is provided with the second scale in a parallel manner. The experiment apparatus for measuring the permeability of the low permeation rock core has the advantages of small dead volume and high metering precision.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, in particular relates to an experimental device and method for measuring the permeability of rock cores in the field of petroleum and natural gas development, in particular to an experimental device and method for measuring the permeability of low-permeable rock cores. Background technique [0002] Low permeability core means that the permeability is between (0.1~50)×10 -3 The μm porous medium and the single-phase fluid seepage problem in low-permeability rock core have a very wide application background in the fields of energy development, water conservancy engineering, and nuclear waste treatment. Among China's current proven reserves and developed reserves, low-permeability reserves account for a large proportion. The permeability of rocks characterizes the ability of rocks to allow fluid to pass through, and is one of the most basic physical parameters describing reservoir rocks. Low-pe...

AI Technical Summary

Problems solved by technology

Low-permeability rock cores have small pore size and low permeability. Due to factors such as instrument dead volume, fluid volatilization, experimental errors, and rock incomplete saturation, it is difficult to accurately measure the inlet pressure and outlet flow rate of low-permeability rocks in conventional rock flow experiments, resulting in poor results. There is a big difference from the actual physical process, and the result is difficult to match the actual production

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