低渗透油藏压裂水平井井网优化方法研究

Study on optimization of hydraulically fractured horizontal well pattern
in low permeability reservoirs

张晨朔 姜汉桥

中国石油大学（北京）石油工程学院，北京 102249

College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

采用压裂水平井井网是开发低渗透油藏的有效手段，但此类井网的缝网参数较多，注水开发使得渗流规律与油水分布更为复杂，诸多参数存在交互作用，井网优化难度增大。针对压裂水平井缝网参数优化过程中面临的问题，按照从局部到整体，从主要到次要的研究思路，分析裂缝半长与裂缝密度对压裂水平井单井产能的影响规律；然后根据裂缝参数技术界限，以最大采出程度和净现值为目标，研究了注采井距、水平段长度、水平井裂缝半长、注水井裂缝半长、排距等缝网参数对目标值的影响规律及相应机理，得出了缝网参数的最优组合，为低渗透油藏压裂水平井网优化提供了方法和借鉴。

The fractured horizontal well pattern is an important technique to develop low permeability reservoirs, but some factors including multiple parameters of fractures and well pattern, more complicated seepage law and oil-water distribution made by water flooding and interaction of some parameters make the optimization of well pattern more difficult. Aiming at the problems encountered in the optimization process of fractures and well patterns of fractured horizontal wells, this paper firstly analyzes the change rule of individual well productivity influenced by the fracture half-length, interval and numbers, and then optimizes the factures and well patterns according to the sequence from microcosm to macrocosm and from major to minor. On the basis of technical limit for fracture parameters concluded, the influence law and mechanism of well spacing, array-spacing of well pattern, the length of horizontal well, the fracture length of horizontal and injection wells and the fracture length distribution of horizontal well are studied taking aim at recovery percentage and net present value(NPV), and optimization conclusions are drawn. The study possesses a method and certain guiding significance for the design optimization of practical patterns of fractured horizontal well program.

10.6056/dkyqt201401017