Microscopic rock network model manufacturing method

Abstract

The invention discloses a microscopic rock network model manufacturing method. The microscopic rock network model manufacturing method comprises the steps that a pore-throat passage is extracted, pores and throat ways in the pore throat passage are separated, pore patterns and throat way patterns are obtained, and pore masks and throat way masks are manufactured correspondingly; through the pore masks and the throat way masks, base pieces are etched to form etched base pieces; and the etched base pieces are in key fit with cover pieces to form a microscopic rock network model. According to themicroscopic rock network model manufacturing method, through pore-throat separating, image aligning and repeated photoetching, a micro-nano oil gas flowing passage which is closer to the reality of an oil reservoir is achieved in the microscopic glass model, control over the reaction time in the etching technique is accurate, the depth-width ratio, smoothness and flatness of the passage are good,pressure does not need to be provided in the key fit process, the nano passage can be better protected, key fit of the real sand rock microscopic models of the micron pores and the nano throat ways is achieved, and microscopic dynamic change, such as Haines phase step and non-wetting phase coalescence, which cannot occur on a two-dimensional planar model is taken on.

Description

technical field [0001] The embodiments of the present invention relate to the field of oil and gas development, in particular to a method for making a microscopic rock network model. Background technique [0002] With the continuous deepening of theoretical research on oil and gas resource development, the hot and difficult issues in oil and gas field development have gradually shifted from conventional oil and gas development and enhanced oil recovery to unconventional oil and gas efficient development. [0003] my country's microscopic physical simulation experiments started relatively late. The seepage of the Chinese Academy of Sciences, led by Academician Guo Shangping, put forward the idea of ​​"microscopic seepage" earlier, and formed a series of microscopic seepage simulation and testing technologies in the 1990s. A large number of studies have been carried out on fluid flow in micron-scale channels in conventional oil reservoirs, revealing some important seepage mecha...

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Problems solved by technology

[0004] However, the past microscopic glass models have great limitations when applied to the development of tight reservoirs, mainly in four aspects: (1) The channel scale of the conventional etching sand filling model is generally too large, generally 20 μm-200 μm, which is different from that of tight reservoirs. The size of the main pore throats in the reservoir varies greatly (pores 20μm-80μm, throats 100nm-700nm) and it is difficult to study the flow of fluids in micro-nanoscale pore throats; (2) Conventional visual microfluidic chips are all two-dimensional chips , the channel depth of the entire model is the same, which is very different from the three-dimensional difference between the pore throats of real sandstones. The microscopic dynamics such as the Haynes step and oil-water accumulation of fluid flowing between the pore throats are difficult to appear, which is different from that of oil and gas in tight oil reservoirs. (3) For the microscopic model made of real sandstone slices as raw materials, adhesives need to be added during the production process to change the surface properties of the core, and the observation effect is poor, and the fluid inside the observation channel cannot be reached. The purpose of flow, adsorption, and diffusion

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