Simulated testing device and method for gas production contribution rate of heterogeneous coal-bearing reservoir

Abstract

The invention provides a simulated testing device and method for the gas production contribution rate of a heterogeneous coal-bearing reservoir. The device is composed of a pressurization system, a heterogeneous coal-bearing rock series simulation system, a back pressure system and a data acquisition and processing system. The heterogeneous coal-bearing rock series simulation system is provided with two gas input ends, the two gas input ends of the heterogeneous coal-bearing rock series simulation system are connected with the gas output end of the pressurization system and the gas output endof the back pressure system. To sum up, the gas production contribution rate of different layers can be tested under the condition of considering interlayer channeling, and a simple and feasible method is provided for gas production prediction of reservoirs with large reservoir thickness, reservoirs with complex lithological characters or multiple-layer reservoirs encountered on the scene. The device can be used for simulating accurate prediction of the gas production rate of coal and rock reservoirs under heterogeneous conditions, and thus a theoretical basis is provided for follow-up economic evaluation, engineering construction and accurate implementation of deployment plans.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development engineering, and in particular relates to a simulation test device and a test method for gas production contribution rate of heterogeneous coal-bearing rock series reservoirs. Background technique [0002] Coalbed methane is a clean and efficient energy source. After more than 40 years of exploration and development of coalbed methane in my country, its development depth has changed from the original 400-500 meters to the current 700-850 meters. In some areas, the depth of coalbed methane development has exceeded 1200 meters. When the development depth exceeds 1200 meters, if only coalbed methane is developed, on the one hand, the development cost will be greatly increased; on the other hand, the increase in the development depth will lead to an increase in the stress on the coal seam, a decrease in the permeability of the coal reservoir, and an increase in the difficulty of ...

AI Technical Summary

Problems solved by technology

Due to the differences in the occurrence conditions of coalbed methane and conventional sandstone gas, the gas production mechanism is different, and the model constructed has limitations in the applicability of all reservoirs

Due to the unknown contribution to gas production in heterogeneous reservoirs, it affects the accuracy of production capacity prediction and economic evaluation results, and ultimately affects the accurate implementation of engineering construction and deployment plans

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