低渗透油田开发注采井网系统设计探讨

对比研究了低渗透率砂岩油田开发的合理井网及其产能的影响因素。裂缝的存在大大加剧了低渗透率油藏中渗透率分布的方向性，在对比分析了不同井网的特点及数值模拟结果后，提出菱形反九点井网是低渗透率油田开发中的相对合理井网。菱形反九点井网中，储集层渗透率与合理排距／井距值关系密切，渗透率越低，合理排距／井距值越小，对渗透率较大的油藏，排距／井距值约为1：2。影响菱形反九点井网开发效果的因素有：采油井和注水井的压裂状况、注水井和采油井的压裂规模、油层的韵律性、平面渗透率比值及角井的转注时机。图4表1参5（郭海莉摘）

A design of optimal well pattern for the development of low permeability reservoirs

Reasonable well pattern and the factors affecting the well pattern's recovery are analyzed and correlated in the development of low permeability sandstone reservoirs in this paper. The presence of natural fractures increases the degree of permeability heterogenity.Through numerical simulations of various fractured well patterns and after comparison of the features of different well patterns, it is proposed that lozenge inverted 9 spot well pattern is the relatively optimum well pattern for the development of low permeability reservoirs. Subsequently, a large number of heterogeneous geological models have been constructed for numerical simulation to determine the optimal ratio of distance between producer and injector to well spacing corresponding to different low permeability reservoirs. Furthermore, factors affecting the development of lozenge inverted 9 spot well pattern are analyzed, including fracturing status of producer and injector, fracturing scale of producer and injector, fining upward or coarsening upward sequences,Ky/Kx and timing for the conversion of corner producer to injector.