Fracturing fluid permeating and sucking production increasing simulation method and device of double-hole and double-permeability medium reservoir

Abstract

The embodiment of the invention provides a fracturing fluid permeating and sucking production increasing simulation method and device of a double-hole and double-permeability medium reservoir and belongs to the technical field of oil and gas exploitation production increasing. According to the method and device, the water-containing saturation degrees and the water phase pressure of a crack in thereservoir under different permeating and sucking effect indexes are calculated through a double-medium model, and therefore an optimal permeating and sucking effect index is obtained; under the optimal permeating and sucking effect index, the pressure of the crack in the reservoir is optimal, and the recovery ratio is highest; and thus, the fracturing fluid permeating and sucking production increasing simulation method and device of the double-hole and double-permeability medium reservoir provides a reliable means for further research on increasing of the recovery ratio of a compact sandstonereservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas production stimulation, in particular to a fracturing fluid imbibition simulation method and device for dual-hole and double-permeability media. Background technique [0002] For reservoirs with moderate clay content, it is a hot topic to study imbibition to enhance oil recovery, especially for tight reservoirs, the pore throats are micro-nano scale, easy to form permeable areas, the capillary pressure is large, and the imbibition replaces oil and gas. The effect is better. [0003] Sandstone reservoirs with permeability less than 0.1 mD are usually defined as tight sandstone reservoirs, which are characterized by tight pores, low permeability, and low conventional recovery. Therefore, water flooding and other enhanced oil recovery operations are required to develop such reservoirs. [0004] Numerical simulation using a dual-porosity and dual-permeability media model is an important method f...

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Problems solved by technology

[0006] Research at home and abroad mainly focuses on the process of water flooding. The efficiency of water displacement oil is mostly experimental research. Due to the limitation of experimental design ideas, there is no outstanding understanding at present. The imbibition simulation model based on experimental results is not good enough. more common

Tight sandstone reservoirs have a strong imbibition effect. During the process of fracturing fluid loss, the intensity of imbibition and the swept area are large, which has a great impact on the efficiency of replacing oil with deeper water. Therefore, it is necessary to use the porous media model However, there is no research on the displacement model considering the imbibition effect of fracturing fluid in tight sandstone dual-porosity and dual-permeability media reservoirs.

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