Water-drive reservoir well network optimization design method

Abstract

The invention belongs to the field of oil and gas field development, and particularly relates to a water-drive reservoir well network optimization design method. The method adopts the well network and well position two-stage optimization design, and includes the following steps of firstly, finding and arranging reservoir geological development data; secondly, conducting first-stage well network design and determining reasonable well network density and well network mode; thirdly, conducting second-stage well position optimization, and optimizing and fine adjusting well positions of all wells. By means of the method, the reservoir physical property and heterogeneity, the reservoir fluid heterogeneity, the economic factors and the like can be comprehensively considered; by means of the two-stage design method with the first-stage well network design and the second-stage well position optimization, the linked optimization of well network density, well distribution mode and well positions is achieved; the optimization efficiency can be greatly improved for large-scale reservoir.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a method for optimizing the well pattern design of a water flooding oil reservoir, which is used for improving the recovery rate of the oil reservoir. Background technique [0002] The design of water injection well pattern is one of the most critical tasks in the formulation of reservoir water injection development plan. Well pattern design needs to fully consider reservoir physical properties and development conditions to maximize development benefits. However, due to the large number of parameters affecting the optimal well pattern and the complex relationship between parameters, it is very difficult to determine the optimal well pattern. [0003] Through retrieval, the invention patent with application number 201310302819.9 (authorized announcement number is CN103422849A) discloses a method and device for rebuilding well patterns in old oil fields for...

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Problems solved by technology

[0004] For a long time, the optimal design of well pattern has mainly relied on the experience of reservoir engineers. However, due to the strong heterogeneity of the reservoir and the large difference in physical properties, it is difficult to judge the type and location of the optimal well pattern by artificially selecting the well pattern. limitation

In recent years, researchers and engineers at home and abroad have proposed a well pattern and well location optimization design method that combines optimization theory and numerical simulation, but relying on numerical simulation to evaluate the effect of each scheme, resulting in a huge amount of calculation and time-consuming in the entire optimization process Very long, limited amount of calculation and time is often difficult to obtain satisfactory results

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