模拟退火算法在压注采系统优化中的应用

压注采系统是一个包括低渗透油田开发中压裂、注水和采油三个主要环节的非线性复杂系统 ,用常规方法难以对该系统进行优化设计 ,为此提出了用模拟退火算法优化压注采系统的方法 .模拟退火算法是一种全局优化方法 ,对初始点的依赖性不强 .特别是对于本身就涉及到大型数值计算的压注采系统 ,模拟退火算法更显示出其直接寻优的优势 .研究结果表明 ,用模拟退火算法能有效地解决压注采系统的非线性全局优化问题 ,可以得出不同条件下压、注、采的最佳匹配关系 ,实现了压裂、注水和采油技术与经济的统一 ,从而为提高低渗透油田开发的整体效益提供了可靠的理论依据.

Application of Simulated Annealing Algorithm to the Optimization of the Fracturing, Injection and Production System

It is difficulty to optimize the fracturing, injection and production system (FIPS) by conventional optimal methods because it is a nonlinear and complicated system including three key sectors, hydraulic fracturing, water injection and oil production in the development of low permeability reservoirs. Methods for optimizing the FIPS using the simulated annealing algorithm (SA) are presented. SA is a global optimal method and independent on the selection of the initial points. Especially for the FIPS itself involving larger numerical calculations, SA demonstrates the priority of direct search. The results show that SA can solve the global optimization of nonlinear problems for the FIPS effectively. The optimum matching relationship among fracturing, injection and production is obtained. The technical and economical integration for hydraulic fracturing, water injection and oil production is achieved. A reliable theory is provided for improving the integral profits for the development of low permeability reservoirs.