Targeted water flooding design method for fracture-vug carbonate oil reservoir

Abstract

The invention discloses a targeted water flooding design method for a fracture-vug carbonate oil reservoir. The method comprises the following steps that S1, an injection-production well group is determined; S2, a water injection well and oil production wells are determined; S3, the control volume and conductivity between the injection well and each production well are determined; S4, the maximumproduction pressure difference between the injection well and the production wells is determined; S5, a production pressure difference ratio between the injection well and each production well is determined; S6, a production pressure difference between the injection well and each production well is determined; S7, the liquid yield of each oil production well is determined; and S8, the maximum daily water injection amount of the water injection well is determined. According to the design method, the injection-production amount is determined according to the controlled reserves and conductivityamong the injection and production wells, the problem of unidirectional efficiency caused by water channeling of injection water along a dominant channel is avoided, and the water injection sweep efficiency and the water injection utilization rate are increased.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a design method for targeted water flooding of fracture-cave carbonate reservoirs. Background technique [0002] Marine carbonate reservoirs play an extremely important role in global oil and gas production. According to the statistics of the market research organization IHS Markit in 2000, the marine carbonate rock oil and gas resources accounted for about 70% of the world's total oil and gas resources, and the proven oil and gas recoverable reserves accounted for about 50% of the world's total oil and gas recoverable reserves . Marine carbonate rocks accounted for about 63% of the global oil and gas production in 2011 (Zhao Wenzhi, Hu Suyun, Liu Wei, Wang Tongshan, Li Yongxin. Re-discussion on the geological characteristics of deep marine carbonate rocks in China and exploration prospect[J]. Natural Gas Industry, 2014,34(04):1-9). [0003] The...

AI Technical Summary

Problems solved by technology

[0020] The main problem existing in the existing technology is: the design of water flooding injection and production volume does not take into account the difference in the degree of connectivity between wells

The above-mentioned injection-production volume design is based on the conceptual model combined with field statistics. The actual formation is often the result of the combined effect of different geological backgrounds. There may be two or more karst types in the same area, and different types of karst reservoirs interact. Geological conditions are more complex

If uniform injection and production volumes are adopted indiscriminately, the injected water of wells with good connectivity will be affected preferentially, and water will appear soon and flooded. At this time, the production wells with poor connectivity are still in the state of "water shortage"

As a result, the effect direction is single, the sweep coefficient is low, and the utilization rate of water injection is low

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