Simulation device and method for water lock damage in tight sandstone gas reservoirs and water lock release by electric heating

Abstract

The invention discloses a compact sandstone gas reservoir water-blocking damage and electrical heating water-blocking reliving simulation device and method. The device is mainly composed of a rock core, a gas bottle, a resistance probe, a pressure sensor, a temperature sensor, a circulating system, a condensation pipe, a data acquisition system, a gas mass flow meter and an electric heating rod, wherein a shell is arranged on the outer layer of the rock core and end covers are arranged at the upper and lower parts of the rock core; a gas inlet is formed in the shell; a well hole is formed in the center of the rock core; 5-10 drilling holes stretching into the rock core are distributed by taking the well hole as the center, and the resistance probe is arranged; the probe is connected with the temperature sensor and the pressure sensor; the circulating system and the electric heating rod are arranged in the well hole; the circulating system is composed of a pump and a simulated oil pipe; the pump is connected with the well hole; and the simulated oil pipe is connected with the condensation pipe and the gas mass flow meter. The method provided by the invention can be used for monitoring and recording the changes of temperatures, pressure, resistance and gas flows in real time, and simulating a whole water-blocking damage and electrical heating water-blocking reliving simulation process. With the adoption of the compact sandstone gas reservoir water-blocking damage and electrical heating water-blocking reliving simulation device and method, a stratum water-locking problem can be effectively solved, and a stratum environment of a near-well region is recovered and improved.

Description

technical field [0001] The invention relates to a simulation device and method for tight sandstone gas reservoir water lock damage and electric heating release water lock in the field of oil and gas exploitation, which can effectively increase the recovery rate of the reservoir and improve the reservoir environment. Background technique [0002] During drilling, completion, workover and production operations, foreign phases are trapped in porous media in many cases. The infiltration of another immiscible phase into the reservoir or the increase of the saturation of the original immiscible phase in the porous medium will damage the relative permeability, so that the permeability of the reservoir and the relative permeability of oil and gas will be significantly reduced. When the immiscible phase is aqueous, this phenomenon is called water lock-in. According to researches at home and abroad, water lock damage seriously affects the development effect of gas reservoirs, and has...

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Problems solved by technology

[0004] Chinese patent CN102536165A discloses a method for heating liquid water in a low-permeability tight sandstone layer by generating microwaves through a microwave generating device. However, the strong microwave penetration ability makes the heating depth deep, and the required power is large. It is difficult to install a high-power microwave generating device, which has great limitations

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