Optimization design method of reservoir well pattern and injection-production scheme based on balanced water flooding concept

Abstract

The invention provides an oil deposit well pattern and injection-production scheme optimum design method based on a balanced water drive idea. The method comprises the steps of 1, collecting and arranging block geological and development related data; 2, setting optimizing related parameters, and completing the well pattern and injection-production optimization preparation work; 3, adopting an oildeposit engineering method, predicting the displacement condition on each direction under current well location and injection-production parameters and performing quantitative evaluation; 4, adoptinga global random search algorithm, optimizing and generating novel well location / injection-production parameters, and predicting and evaluating the displacement condition in each injection-productiondirection under novel well location injection-production parameters; 5, arranging the optimization result, forming a well pattern injection-production design scheme, and performing on-site implementation. According to the method, the water drive development index calculation method built on the basis of the oil deposit engineering idea is combined with the optimization theory, the global random search algorithm is adopted for automatic solving, the calculation efficiency is ensured while the well pattern and injection-production scheme matched with the actual oil deposit is obtained, and the oil deposit recovery efficiency is improved.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to an optimal design method for oil reservoir well patterns and injection-production schemes based on the concept of balanced water flooding. Background technique [0002] Well pattern and injection-production plan are important contents in the reservoir development plan, which directly affect the reservoir development effect. How to formulate the optimal well pattern and injection-production scheme is one of the difficult problems in the design of oilfield development scheme. At present, the commonly used optimization design methods of well pattern and injection-production scheme mainly include: relying on human experience to design well pattern and injection-production scheme, and optimizing design of well pattern and injection-production scheme based on optimization theory. Relying on human experience to design well patterns and injection-production schemes needs to ...

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Problems solved by technology

Relying on human experience to design well patterns and injection-production schemes needs to consider many factors, and subjective factors have a great influence. At the same time, it is difficult to obtain the real optimal well pattern and injection-production scheme; Numerical simulation evaluates the advantages and disadvantages of each scheme in the optimization process. For actual large-scale reservoirs, the calculation amount is large and time-consuming, and it is difficult for conventional computers to realize

Moreover, the current method is mainly divided into two independent parts, the well pattern optimization method and the injection-production optimization method, which lack the combination

When using the gradient algorithm to solve the problem, the calculation of the gradient is complicated, and the constraint conditions are complicated to deal with. At the same time, it is easy to fall into the local optimum and cannot find the real optimal solution.

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