缝洞型碳酸盐岩储层水平井分段酸压技术研究

塔中I号气田试验区储层为奥陶系缝洞型碳酸盐岩储层,酸压改造是提高该类型储层开发效果的关键技术之一.针对塔中I号气田碳酸盐岩低孔低渗、非均质性强及水平井段长的特点,在分析储层地质特征的基础上,综合水平段储层物性特征、长度、污染状况及产能与净现值,提出了水平井分段优化方法;根据塔中I号气田储层特征,推荐了塔中I号气田水平井...

Technical study on staged acid fracturing of horizontal well in fractured-cavernous carbonate reservoir

The reservoir of pilot area in Tazhong I Gas Field is Ordovician fractured-cavernous carbonate reservoir. Acid-fracturing stimulation is one of the key technologies for this type of reservoir. Aiming at the characteristics of low porosity, low permeability, strong heterogeneity and long horizontal section, and synthesizing the physical property of reservoir, length, pollution level, productivity and net present value, the writer proposed a subsection optimization method for horizontal wells. Based on the analysis of reservoir geologic characteristics of Tazhong I Gas Field, the completion method was recommended. Combined with the staged reforming tools and machinery subsection technology of horzontal well at home and abroad at present, this paper optimized the machinery sub-packer tools fitting for acid fracturing of horizontal well in Tazhong I Gas Field. Pinpoint completion staged reforming technology and six times of staged acid fracturing were adopted to conduct the staged acid fracturing for Horizontal Well TZ62-11H in Tazhong I Gas Field. The post-fracturing test indicates that the staged acid-fracturing of horizontal well is an effective means to improve the productivity of oil well in fractured-avernous carbonate reservoir.