Intelligent Optimization Method for Irregular Well Pattern

Abstract

The invention discloses an intelligent optimization method for an irregular well network, and belongs to the technical field of oil exploitation. The method comprises the steps: extracting the geometric boundary of a block; generating to-be-optimized initial well network parameters: well array, well spacing and well array direction; randomly selecting one point as an original point of an initial well network, generating a basic well array, moving the basic well array, and generating the initial well network; carrying out the value simulation in the initial well network, obtaining the daily oiloutput, daily water output and daily gas output curves of a whole oil reservoir; taking a recovery efficiency or a net present value as a target function, carrying out the optimization of the initialwell network parameters through employing an intelligent optimization method, and obtaining an optimal parameter combination; and generating an optimal well network according to the obtained optimalparameter combination. According to the invention, the method gives full consideration to the boundary of the oil reservoir, the position of a fault, reservoir anisotropism, heterogeneity and a crackgrowth region, can improve the recovery efficiency or the net present value of the oil reservoir, and can be directly used for the design of an oil reservoir exploitation scheme and the well drillingconstruction.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to an intelligent optimization method for irregular well patterns. Background technique [0002] Due to the division of fault blocks in complex fault-block reservoirs, the fault blocks are small and have different shapes, and each fault block is an independent development unit. Due to the small area of ​​fault blocks during development, it is difficult to deploy and produce wells with perfect conventional area well patterns, so small fault block reservoirs generally can only be developed with imperfect well patterns. [0003] In the process of well location deployment, it is necessary to design and adjust the well pattern structure to achieve the purpose of improving the recovery rate (or maximizing the net present value). For small fault block reservoirs, at present domestically, the automatic well location optimization method based on optimization theory is mainly ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the optimized well pattern can only be a strictly regular well pattern, but the trap range of the actual oil and gas reservoirs is irregular, and most of the reservoirs have complex geological structures and various oil layer distributions, which lead to the use of strict The regular well pattern (that is, the well spacing and row spacing are always consistent) cannot obtain the maximum production benefit

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