Experimental device for simulating substrate-crack static/dynamic imbibition and oil discharge and method of experimental device

Abstract

The invention discloses an experimental device for simulating substrate-crack static / dynamic imbibition and oil discharge and method of the experimental device. The experimental device for simulatingsubstrate-crack static / dynamic imbibition and oil discharge comprises a high-pressure gas cylinder, an injection pump, an intermediate container, a core holder and a back pressure pump, wherein the lower end of the intermediate container is connected with the injection pump, and the upper end of the intermediate container is connected with the high-pressure gas cylinder; a compact core is arrangedat the inner bottom of the core holder; a fracturing proppant compaction belt is arranged at the upper end of the compact core; a left through hole and a right through hole are separately formed in the position, located on the end surfaces of the cylinder wall of the core holder, of the left end surface and right end surface of the fracturing proppant compaction belt; and a first through hole andthe left through hole are both connected with the upper end of the intermediate container, a second through hole and the right through hole are both connected with the right end of the back pressurepump, and an oil-gas separation and metering device is arranged at the upper end of the back pressure pump. The experimental device for simulating substrate-crack static / dynamic imbibition and oil discharge is used for studying the phenomenon of imbibition and diffusion of injected fluid from cracks to dense substrate under the condition of high temperature and high pressure, and the law of mass transfer between substrate-crack in the fractured dense oil reservoir is determined through the device and the experimental method, and reference is provided for enhancing oil recovery in the dense oilreservoir.

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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