Experimental method and device for simulating composite multi-layer gas reservoir exploitation

Abstract

The invention provides an experimental method and device for simulating composite multi-layer gas reservoir exploitation. The device comprises an injection system (1), a coal seam model system (2), a dense sandstone layer model system (3), a shale model system (4), a back pressure system (5), a recovery system (6) and a data acquisition system (7), wherein the injection system (1) is connected with the coal seam model system (2), the dense sandstone layer model system (3) and the shale model system (4) via a first multi-channel valve (81); the coal seam model system (2), the dense sandstone layer model system (3) and the shale model system (4) are connected with the back pressure system (5) via a second multi-channel valve (82); the back pressure system (5) is connected with the recovery system (6); and the data acquisition system (7) is connected with the coal seam model system (2), the dense sandstone layer model system (3), the shale model system (4) and the recovery system (6).

Description

technical field [0001] The invention relates to the field of natural gas exploitation, in particular, the invention relates to an experimental method and device for simulating the exploitation of composite multi-layer gas reservoirs. Background technique [0002] The world is rich in unconventional natural gas resources, and abundant coalbed methane reservoirs, tight sandstone gas reservoirs and shale gas reservoirs are generally developed in major sedimentary basins. With the continuous expansion of the scale of exploration and development of unconventional gas reservoirs, the phenomenon of multilayer superposition of coal seams, tight sandstone layers and shale layers is becoming more and more common. For gas layers with a small thickness, single-layer mining has the problems of low production capacity and high mining difficulty. In order to improve the productivity and efficiency of gas wells and realize the efficient production of gas wells, domestic and foreign scholar...

AI Technical Summary

Problems solved by technology

The disadvantage of this device is that it can only simulate the same type of gas reservoir, but cannot simulate the exploitation of coalbed methane and shale gas reservoirs; it can only simulate the migration of single-phase gas in the reservoir, and cannot consider the liquid phase. Influence; cannot simulate the temperature conditions of the original reservoir

The disadvantages of this device are: the device can only simulate multi-coal seam mining, and cannot be extended to the simulation of multi-layer gas reservoir mining; it cannot simulate the temperature conditions of the original reservoir; methane can only be adsorbed on the water film , the adsorption amount obtained in the experiment is smaller than the actual situation

The disadvantage of this device is: the device can only simulate the migration of single-phase gas in the reservoir, and cannot consider the influence of the liquid phase, which is inconsistent with the actual situation of the shale reservoir; the device is simulated with a flat core in the flat model core holder The adsorption and desorption of shale gas cannot effectively simulate the three-dimensional stress environment of the original reservoir, and cannot accurately reveal the law of adsorption and desorption of shale gas in shale

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