各向异性油藏水平井加密矢量组合井网合理调整策略  

Reasonable adjustment strategy of horizontal well infill vector combination well pattern in anisotropic reservoir

作　　者：屈丹 陈民锋[1,3] 毛梅芬 杨子由 杨金欣 QU Dan;CHEN Minfeng;MAO Meifen;YANG Ziyou;YANG Jinxin(College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing City,102249,China;SINOPEC Chongqing Fuling Shale Gas Exploration and Development Co.,Ltd.,Chongqing City,408014,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing City,102249,China)

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石化重庆涪陵页岩气勘探开发有限公司,重庆408014 [3]油气资源与探测国家重点实验室,中国石油大学(北京),北京102249

出　　处：《油气地质与采收率》2021年第5期100-108,共9页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“油气资产价值评估体系研究”(2016ZX05033005-007)。

摘　　要：各向异性油藏经长期水驱开发后,常表现出平面驱替不均衡、开发效果差的特点,为实现水驱液流改向、提高储量动用效果,达到均衡驱替开发,如何有效进行井网调整是关键。采用在反九点直井井网的对角油井间加密水平井的方式,利用渗流力学保角变换和镜像反映原理,建立井间对角线加密水平井注采井网渗流模型,并提出评价注采井网储量动用能力及动用效果的方法。结合油田实际参数,分析在储层具有渗透率各向异性的条件下,水平井加密后注采单元中的储量动用规律;综合储量动用效果和开发实施条件,确定了各向异性油藏井间对角线加密水平井的合理长度及开发制度。结果表明,该水平井加密模式对储层具有渗透率各向异性时有较好的适应性,加密水平井合理长度约为原井网对角线井间长度的0.5倍。After long-term waterflooding development,anisotropic oil reservoirs often show uneven planar flooding and poor development effects.How to effectively adjust the well pattern is the key to redirection of waterflooding fluid flow,enhanced producing reserves,and balanced flooding development.The infill horizontal wells between diagonal oil wells with the inverted nine-point vertical well pattern are adopted,and the conformal transformation and the principle of mirror reflection of seepage mechanics are employed to create a seepage model of the injection-production pattern of diagonal infill horizontal wells.In addition,a method to evaluate the producing reserves capacity and effect of the injection-production well pattern is proposed.In light of the actual parameters of the oilfield,the law of producing reserves in the injection-production unit after horizontal well infill is analyzed in the reservoirs with anisotropic permeabilities.With regard to the effect of producing reserves and development conditions,the reasonable length and development system of diagonal infill horizontal wells between wells in anisotropic reservoirs have been determined.The results show that the horizontal well infill mode has good adaptability in the reservoirs with anisotropic permeabilities;the reasonable horizontal well infill length is about 0.5 times the diagonal interwell length of the original well pattern.

关 键 词：各向异性 水平井 加密调整 渗流模型 渗流场分布 调整策略 

分 类 号：TE341[石油与天然气工程—油气田开发工程]