库车山前超深巨厚致密砂岩纵向细分层改造技术  

Vertical Subdivision Layer Stimulation Technology for Ultra-Deep and Super-Thick Tight Sandstone in Kuqa Piedmont

作　　者：彭芬 张宝[1] 杨鹏程 薛浩楠 彭建新[1] 盛志民 PENG Fen;ZHANG Bao;YANG Pengcheng;XUE Haonan;PENG Jianxin;SHENG Zhimin(Oil and Gas Engineering Research Institute,PetroChina Tarim Oilfield Company,Korla,Xinjiang,841000,China;Downhole Operation Company,CNPC Xibu Drilling Engineering Company Limited,Karamay,Xinjiang,834000,China)

机构地区：[1]中国石油塔里木油田分公司油气工程研究院,新疆库尔勒841000 [2]中国石油集团西部钻探工程有限公司井下作业公司,新疆克拉玛依834000

出　　处：《石油钻探技术》2024年第2期187-193,共7页Petroleum Drilling Techniques

摘　　要：塔里木油田库车山前白垩系储层为超深巨厚裂缝性致密砂岩储层,天然裂缝发育,非均质性强,已改造井产气剖面测试显示常规笼统改造纵向厚储层动用不充分,产能释放不彻底。为了解决这一问题,对于油层厚度大且中间有明显隔层的井可实施分层压裂,提高纵向改造程度。通过工程地质一体化研究,利用多种测井数据,建立了一套多尺度近远井裂缝精细识别方法;基于钻井漏失量与产量关系认识,建立了一套综合考虑构造位置、钻井井漏、裂缝发育情况、力学活动性等资料的储层评估分类方法;通过双封隔器管柱力学精细校核,增加伸缩管,优化暂堵材料粒径,形成了“机械+暂堵”软硬分层压裂技术。该技术实现了巨厚储层高效动用,应用20口井,改造后单井产气量由6.7×10^(4)m^(3)/d提高至34.0×10^(4)m^(3)/d,平均增产4倍,提产效果显著,为巨厚致密砂岩储层高效开发提供了技术支撑。The Cretaceous system in Kuqa Piedmont of Tarim Oilfield is a super-deep and super-thick fractured tight sandstone with developed natural fractures and strong heterogeneity.The gas production profile test of stimulated wells shows that the conventional general stimulation of vertical thick reservoirs is not sufficient,and the production capacity is not completely released.In order to solve these problems,layered fracturing technology can be implemented for wells with large reservoir thicknesses and obvious interlayers,which can also enhance the performance of vertical stimulation.A set of fine identification methods for multi-scale fractures of near and far wells was established by using multi-logging data through engineering and geology integration research.Based on the relationship between lost circulation and production,a set of reservoir evaluation classification methods was established,which comprehensively considered the structural location,lost circulation in drilling,fracture development,mechanical activity,and other data.Through fine mechanical checking of double packer pipe string,expansion pipe was added,and the grain size of temporary plugging material was optimized,forming a soft and hard layered fracturing technology featuring“mechanical+temporary plugging”,thus realizing the highly efficient production of the super-thick reservoir.The technology was applied to 20 wells,and the production of a single well was increased from 6.7×10^(4)m^(3)/d to 34.0×10^(4)m^(3)/d after stimulation,with the production remarkably increasing by four times on average.The technology provides strong technical support for the efficient development of super-thick tight sandstone reservoirs.

关 键 词：库车山前 超深厚储层 致密砂岩 复合分层 精细改造 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]