Self-adaptive well pattern optimization method based on gradient algorithm

Abstract

The invention belongs to the field of development of oil and gas fields and particularly relates to a well pattern optimization method in a large-scale oil field development process. The well pattern optimization method comprises the following steps of: firstly, acquiring oil reservoir data, establishing a three-dimensional digital oil reservoir geological model and simulating an oil reservoir value; secondly, constructing a self-adaptive rule well pattern unit and generating a well pattern; thirdly, calculating economic benefits and evaluating an initial well pattern; fourthly, setting parameters to make preparations for well pattern optimization; fifthly, optimizing the unit and constructing parameters to generate a new well pattern by using a gradient method; and sixthly, calculating and evaluating economic benefits of the new well pattern and carrying out iterative operation until an optimal well pattern is generated. According to the well pattern optimization method disclosed by the invention, the well pattern is optimized by using the optimization theory, so that an optimal well pattern form can be found; the well pattern optimization is combined with injection-production optimization to optimize the optimal injection-production amount under different well pattern forms; the corresponding optimal total injection-production amount is obtained while the well pattern form is optimized; and well patterns with various rules can be optimized.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a well pattern optimization method in the process of large-scale oil field development. Under the condition of given initial well pattern parameters, combined with reservoir numerical simulation, the objective function is optimized through an optimization algorithm, and the calculation is guaranteed. At the same time, the economical and feasible optimal well pattern form suitable for the actual reservoir can be obtained, and the ultimate recovery of the reservoir can be improved. Background technique [0002] At present, more and more oil fields in the world have entered the late stage of development, and the oil and gas resources have decreased sharply. It is more difficult to discover new oil and gas resources in exploration. How to maximize oil and gas production and economic net present value has become the key to oil and gas development. The developme...

AI Technical Summary

Problems solved by technology

This method introduces a new well pattern improvement construction form, considers the injection and production situation of the oilfield while considering the well pattern unit form, and combines the optimization algorithm to find the optimal well pattern layout, aiming to solve the low computational efficiency existing in the current domestic well pattern optimization , small precision, poor globality, etc.

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