Experimental device and method for water intrusion of gas reservoirs under different crack distribution modes

Abstract

The invention provides an experimental device and method for water intrusion of gas reservoirs under different crack distribution modes. The experimental device comprises a constant-speed and constant-pressure displacement pump, a valve, a piston-type vessel, a pressure sensor, an injection pipeline, an injection opening, a full-diameter core holder, a rubber cylinder, a crack core model, a confining pressure pump, a confining pressure gauge, a confining pressure hole, an outlet, an outlet pipeline, a constant-temperature box, a back pressure device, a gas-liquid separator, a gas meter, a backpressure pump, a back pressure gauge and a base. The core combination model for simulating different cracks is placed in the full-diameter core holder, the bottom of the full-diameter core holder isconnected with the piston-type vessel through a pipeline, and water and gas are provided, confining pressure is applied to a core through the confining pressure pump, an outlet of the full-diameter core holder is connected with the back pressure device, and an outlet of the back pressure device is connected with the gas-liquid separator. According to the experimental device and method for water intrusion of the gas reservoirs under the different crack distribution modes, the different stratum dip angles, the different crack distribution modes, and different edge-bottom water energy can be simulated, and the high-temperature and high-pressure stratum conditions can be met.

Description

technical field [0001] The invention relates to a water invasion experiment device and method of different fracture distribution modes in gas reservoirs, and belongs to the technical field of oil and gas field development. Background technique [0002] In my country, most of the gas reservoirs currently developed belong to edge and bottom water gas reservoirs. With the production of natural gas and the drop of formation pressure, edge and bottom water will gradually invade into the original gas-bearing area, the gas phase permeability will decrease with the increase of water saturation, and the gas flow resistance in the wellbore will increase, resulting in a rapid decline in gas production , the water production rate continues to increase, which may even lead to water flooding of production wells, seriously affecting the final development effect of gas reservoirs. Therefore, it is of great significance to study the law of water invasion in gas reservoirs to formulate effic...

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Problems solved by technology

[0003] At present, most of the methods for studying water intrusion in gas reservoirs are carried out in the physical simulation experiment in the laboratory. One is the microscopic visual physical simulation experiment, which uses advanced laser etching technology to etch the real pore structure of the rock on the optical glass plate. , made into a transparent microscopic physical model that can be used for photography, and then study the law of water invasion microscopically, but the model used in this method is not a real gas reservoir core, and it is difficult to truly reflect the water invasion law of the gas reservoir; It is a macroscopic core physical simulation experiment, which uses real cores to simulate the development process of edge and bottom water gas reservoirs, and studies the law of water invasion of gas reservoirs with different edge and bottom water energy, but most of them are not real gas reservoirs (high temperature and high pressure). The impact of different fracture distribution patterns and different formation dip angles on the law of water invasion is also not considered, so it is impossible to effectively study the impact of edge and bottom water invasion on gas reservoir recovery

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