Experimental device and method for simulating gas reservoir water invasion

Abstract

The invention provides an experimental device and method for simulating gas reservoir water invasion. The experimental device comprises a gas supply device for inputting gas into a man-made rock core model, a liquid supply device for inputting liquid into the man-made rock core model, wherein the man-made rock core model comprises a body provided with a first end and a second end which turn their backs to each other, a first pipeline is arranged at the first end, and a second pipeline is arranged at the second end. A simulated fracture cave communicated with the second pipeline and the first pipeline is formed in the outer wall of the body. A first valve is arranged on a connecting pipeline between the gas supply device and the first pipeline. A second valve is arranged between the liquid supply device and the first pipeline. A third valve is arranged on the first pipeline, a first detecting part is used for detecting the pressure in the first pipeline, and a control device is used for controlling the first valve, the second valve and the third valve based on the first detecting part. The purpose of providing the experimental device capable of understanding distribution characteristics of residual gas after water invasion and simulating gas reservoir water invasion is achieved.

Description

technical field [0001] The invention relates to the field of gas reservoir exploitation, in particular to an experimental device and method for simulating water invasion of gas reservoirs. Background technique [0002] In the initial stage of development of edge water gas reservoirs, gas wells are generally distributed in the pure gas zone. With the deepening of development, the intrusion of formation water increases continuously, and the thickness of the gas-water mixed flow zone continues to increase. The gas well will first enter the mixed flow zone in a certain direction, and the gas well End the waterless production period and enter the water-bearing gas production period. [0003] For heterogeneous gas reservoirs, fractures or large pores are the main channels for water channeling. It is difficult for water to enter the low-permeability and high-pressure pores, but bypasses the low-permeability pore zone and advances along the fractures or large pores to form low-perme...

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Problems solved by technology

Since the rock samples used are natural cores, and the pores of real cores are inside the cores, it is impossible to understand the distribution characteristics of residual gas after water intrusion, so it is impossible to determine the residual gas distribution characteristics in places with more residual gas. Arrange new wells to extract residual gas, so that the degree of recovery cannot be improved

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