Shale reservoir post-fracturing seepage microscopic model, manufacturing method and experimental device

Abstract

The invention belongs to the field of shale oil and gas reservoir research, relates to a shale reservoir post-fracturing seepage micro-model, a manufacturing method and an experimental device and aims to simulate a reservoir microscopic model with a micron-sized pore throat according to the characteristics of low porosity and low permeability of shale oil and gas reservoirs so as to solve the problem that the seepage characteristics of fluids in shale are difficult to observe macroscopically. The manufacturing process of the microscopic model roughly comprises three parts: firstly, manufacturing a mask, and exposing the mask to obtain a model diagram required to be used; performing exposure treatment on a substrate by using the mask, transferring an etching pattern to a photoresist, transferring the etching pattern to a chromium layer from the photoresist, and then transferring the etching pattern to the substrate; and finally, carrying out anodic bonding to manufacture the substrate, thereby obtaining the microscopic model. The microscopic model can be combined with an image acquisition device and an image display device to carry out visual research on injected fluid in the microscopic model, and the flowing condition of the fluid in a micron-sized fracture-matrix reservoir is observed.

Description

technical field [0001] The invention belongs to the research field of shale oil and gas reservoirs, in particular to a microscopic model of seepage after fracturing of shale reservoirs, a manufacturing method and an experimental device. Background technique [0002] It is an inevitable trend in the development of the petroleum industry that the field of oil and gas exploration and development has shifted from conventional oil and gas to unconventional oil and gas. China's rich shale oil resources have become one of the main fields in unconventional oil exploration. However, shale reservoirs have complex structures, strong compactness, strong heterogeneity, and porphyritic wetting characteristics, so they cannot be developed by conventional means. Through the theoretical research on the efficient development of shale reservoirs, it is found that the comprehensive use of multiple fracturing technologies to transform the conventional single main fracture development model into ...

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Problems solved by technology

However, when using on-site cores or artificial cores for flow experiments, it is difficult to observe the internal seepage, and the flow or saturation state of fluid in fractures and matrix cannot be identified by human eyes, and it is impossible to simulate the interior of shale reservoirs after fracturing , so there is an urgent need for a fracture-matrix microscopic model that can better study the fluid flow in shale reservoirs after fracturing

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