2. N-dimensional oil reservoir chip and manufacturing method thereof

Abstract

The invention provides a 2. N-dimensional oil reservoir chip and a manufacturing method thereof. The hydraulic radius / hydraulic diameter of a pore can be adjusted through N times of etching while the main structural characteristics of a real rock core are guaranteed to the maximum extent, a new depth can be achieved through each time of etching, wider pore hydraulic radius distribution under the strong heterogeneous condition can be achieved through the 2.N-dimensional oil reservoir chip; meanwhile, the oil reservoir chips with multiple depths have the characteristics of a quasi-three-dimensional structure to a certain extent, namely, the depth direction can be changed for N times, so that the oil reservoir chips have the characteristics of the three-dimensional structure to a certain extent, the imaging effect of the oil reservoir chips is not influenced, related design and manufacturing methods are simple, each new etching is carried out on the basis of the previous etching, moreover, the pores etched at the next time are larger pores, and the range is narrowed to the center of the pores, so that the requirement on the precision of the next time of etching is low, the error-tolerant rate is relatively high, and the overall connectivity of the structure is not influenced.

Description

technical field [0001] This application relates to, but is not limited to, the field of oil and gas exploration, development and utilization, especially the design and fabrication method of a 2.N-dimensional oil reservoir chip. Background technique [0002] At present, my country's dependence on foreign oil has reached more than 70%, and the exploration and development of oil and gas resources are related to my country's energy security. Since the subsurface seepage process cannot be observed, the mechanism of enhanced oil recovery is currently unclear, especially the mechanism of multiphase flow in complex porous media, which seriously affects the development and application of related enhanced oil recovery technologies and methods. [0003] With the development of microchip technology, microfluidic chip experiment is a powerful means to study the mechanism of pore-scale multiphase flow and study the mechanism of enhanced oil recovery. Compared with real cores, microfluidi...

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Problems solved by technology

[0004] In recent years, although the design of the two-dimensional structure of the chip can satisfy a certain degree of similarity with the core structure, for example, the pore size distribution of the pores of the chip and the pores of the real core are consistent, and the characteristics of the pore distribution are similar, but the chip as The typical two-dimensional layered structure has the same depth, and the limitation in the depth direction leads to the difference between the pore flow process in the chip and the flow in the real core pore

For example, the depth direction directly restricts the hydraulic radius of the pore structure, which leads to the fact that although larger pores can be designed on a chip with a two-dimensional structure, the hydraulic radius / diameter is still very small due to the narrow depth of the third dimension. The size of the hydraulic radius / diameter is directly reflected in the capillary pressure. Although the distribution range of the pore volume in the chip can be designed to be large, the distribution range of the hydraulic radius / diameter of the pores is small (the hydraulic diameter of the pores less than twice the depth); at the same time, chips with the same depth cannot cause snap-off in multi-phase seepage in three-dimensional cores.

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