An experimental device and method for simulating matrix-fracture static and dynamic imbibition and oil drainage

Abstract

The invention discloses an experimental device and method for simulating matrix-fracture static / dynamic oil drainage, including a high-pressure gas cylinder, an injection pump, an intermediate container, a core holder, and a back pressure pump. The lower end of the intermediate container is connected to the injection pump, the upper end of which is connected to a high-pressure gas cylinder, the inner bottom of the core holder is provided with a dense core, and the upper end of the dense core is provided with a fracturing proppant compacting belt, and the core clamping at the left and right end faces of the fracturing proppant compacting belt A left through hole and a right through hole are respectively provided on the end surface of the barrel wall; the first through hole and the left through hole are connected to the upper end of the intermediate container, and the second through hole and the right through hole are connected to the right end of the back pressure pump. , The upper end of the back pressure pump is equipped with an oil-gas separator and a meter. The invention is used to study the phenomenon of imbibition and diffusion of injected fluid from fractures to tight matrix under high temperature and high pressure conditions. Through devices and experimental methods, the law of mass transfer between matrix and fracture in fractured tight oil reservoirs is clarified, which improves the quality of tight oil reservoirs. The recovery factor provides reference and reference.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development engineering, in particular to an experimental device and method for simulating matrix-fracture static / dynamic imbibition and oil discharge. Background technique [0002] Tight oil and gas resources have become a bright spot in global exploration and development. However, due to the characteristics of low porosity and low permeability of tight oil reservoirs, conventional water injection cannot effectively supplement the formation capacity, and the crude oil production declines rapidly. Therefore, how to effectively improve the recovery of tight oil reservoirs has become a key problem that needs to be solved urgently. [0003] For tight oil reservoirs with natural fractures or artificial fractures, injecting water (containing active agent) or gas (natural gas, carbon dioxide, nitrogen, etc.) The suction or diffusion effect enters the matrix from the fractures, thereby discha...

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Problems solved by technology

However, due to the characteristics of low porosity and low permeability in tight oil reservoirs, conventional water injection cannot effectively supplement the formation capacity, and the crude oil production declines rapidly

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