薄窄河道低渗致密砂岩气藏压裂水平井裂缝参数优化  

Optimization of hydraulic fractures of horizontal well in low permeability and tight sandstone gas reservoir with thin and narrow channel

作　　者：杨宇鹏[1] YANG Yupeng(Exploration ＆ Production Research Institute,Southwest Oil ＆ Gas Branch,Sinopec,Chengdu Sichuan 610041,China)

机构地区：[1]中国石化西南油气分公司勘探开发研究院,四川成都610041

出　　处：《石油化工应用》2018年第5期18-24,共7页Petrochemical Industry Application

基　　金：国家科技重大攻关专项"低丰度致密低渗油气藏开发关键技术";项目编号:2016ZX05048

摘　　要：低渗致密砂岩气藏主要采用多段压裂水平井进行开发,其开发效果受裂缝参数影响显著。针对川西地区窄河道砂岩气藏河道类型多样、非均质性强的特点,采用数值模拟方法,对典型河道中水平井的裂缝间距、裂缝长度、导流能力进行优化,并综合分析了影响最优裂缝参数的地质因素。结果表明,最优裂缝间距与储层有效渗透率成正比,河道渗透率越高,裂缝间距越大;最优缝长主要由河道宽度及有效渗透率决定,宽度越宽、渗透率越低的河道最优裂缝越长;裂缝导流能力则受储量丰度及有效渗透率综合影响。根据最优裂缝参数影响因素分析结果,建立了河道地质特征参数与最优裂缝参数间的数学关系式,可用于快速预测不同河道相应的最优裂缝参数。Multi-fractured horizontal wells are widely used in low permeability and tight sandstone gas reservoirs, so the fracture parameters have significant impact on the development effeciency of it. Based on the characteristics of diversified channel and strong heterogeneity of resevre, simulation method was introduced to optimize the space, length as well as conductivity of hydraulic fracture for horizontal wells in tipycal channels. And the geological factors influencing suitable fracture parameters were also analyzed. Result shows that the optimal fracture space is proportional to effective permeability, which means the higher permeablity of channel, the larger space between fractures. And the suitable length of fracture is mainly determined by both the width of channel and ecffective permeability. In the wider channel with lower permeability, the horizontal well with longer fractures will have a higher production. Moreover, both the abundance and effective permeablity of reserve have an effect on the optimal conductivity of fracture. According to the analyzing result of factors influencing optimal fracture parameters, the mathmatical relations between geological parameters and optimized fracture parameters are established which can be used to predict suitable fracture parameters of horizontal wells in differenet channels quickly.

关 键 词：低渗致密砂岩 窄河道 压裂水平井 裂缝间距 裂缝长度 裂缝导流能力 

分 类 号：TE311[石油与天然气工程—油气田开发工程]