Low-efficiency water circulation mine field identification method based on oil-water well pressure coupling analysis

Abstract

The invention provides a low-efficiency water circulation mine field identification method based on oil-water well pressure coupling analysis. The method comprises the following steps of step 1, dividing low-efficiency water circulation analysis units; step 2, determining a low-efficiency water circulation oil-water well pressure distribution rule and a discrimination boundary; step 3, monitoring the static pressure level and the pressure drop rule of a water well; step 4, monitoring the static pressure level of an oil well; step 5, performing structural correction on the actually measured static pressure levels of all oil and water wells in the low-efficiency water circulation analysis unit; step 6, drawing a low-efficiency water circulation analysis unit oil-water well pressure coupling analysis chart, and identifying low-efficiency water circulation oil-water well pairs with; and step 7, comprehensively determining a water channeling layer position in the low-efficiency water circulation oil-water well pairs. The method can accurately describe the spatial distribution of the low-efficiency water circulation of the ultrahigh-water-content oil field, provides an accurate geological basis for the development and adjustment of an oil field, effectively blocks and weakens the low-efficiency water circulation, and strengthens the displacement of the potential interval and the potential direction, thereby improving the development effect of the oil field and improving the water drive recovery efficiency.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a method for identifying low-efficiency water circulation mines based on oil-water well pressure coupling analysis. Background technique [0002] Shengli Oilfield's onshore monolithic oil reservoir has a production reserve of 1.29 billion tons, a recovery rate of 37.6%, and a comprehensive water cut of 95.6%. The difficulty keeps increasing. Under the joint effect of reservoir heterogeneity and long-term high-intensity water injection development, the seepage capacity of local wells in the reservoir in the longitudinal local small layers and plane local directions is significantly enhanced, and high-speed channeling occurs between oil and water wells, forming The low-efficiency water cycle, characterized by rapid water injection-liquid production cycles, leads to poor reservoir development benefits and seriously affects water flooding development results. [0003]...

AI Technical Summary

Problems solved by technology

[0012] The development of dynamic analysis technology can identify low-efficiency water circulation under simple injection-production conditions such as single layer and single direction. However, in multi-layer and multi-directional injection-production systems, the dynamic response of oil and water wells is extremely complex, and it is very difficult to identify low-efficiency water circulation.

[0013] To sum up, the current low-efficiency water circulation mining field identification technology has different characterization mechanisms, and the characterization content has different emphases, but the overall characterization methods are not systematic and perfect, especially in the lack of key technologies in the identification of low-efficiency water circulation directions and inter-well identification. Accurate identification of inefficient water cycles is not yet possible

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