大港油田页岩油储层固井技术研究与应用  

Technology for Cementing Shale Oil Reservoirs in Dagang Oilfield: Study and Application

作　　者：李小林 吴朝明 赵殊勋 林志辉 王贵富 凌勇 王浪 LI Xiaolin;WU Chaoming;ZHAO Shuxun;LIN Zhihui;WANG Guifu;LING Yong;WANG Lang(The Second Cementing Division of the Bohai Drilling and Exploration Company,Tianjin 300280)

机构地区：[1]渤海钻探工程有限公司第二固井分公司,天津300280

出　　处：《钻井液与完井液》2020年第2期232-238,共7页Drilling Fluid & Completion Fluid

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“大港油区效益增储稳产关键技术研究与应用”(2018E-11)。

摘　　要：针对大港油田页岩油储层固井过程中地层压力系统复杂、油气活跃、钾盐钻井液与水泥浆相容性差、钻井液混油驱替困难、水泥石力学性能要求高等难题,开展了固井工作液及配套固井技术措施研究。采用具有洗油作用的功能型前置液,对含油钾盐钻井液的冲洗效率超过90%;针对大港油田页岩油储层固井“四低一高”要求,采用具有静胶凝过渡时间为5 min、抗压强度大、弹性模量低等特点的防窜性能优良、水泥石力学性能突出的高强度韧性防窜水泥浆体系。落实“双扶”、“三扶”通井措施,采用纤维+稠钻井液裹砂携砂井眼清洁技术、虚泥饼清除技术,做好井眼准备工作,优化页岩油储层配套固井技术措施,形成了适用于大港油田页岩油储层的固井工艺技术,该成果在现场获得成功应用。Cementing of the shale oil reservoir section in Dagang oilfield has encountered several difficulties such as complex formation pressure system,active oil and gas,poor compatibility between the potassium salt drilling fluid and the cement slurry,difficulty in displacing drilling fluid mixed with oil,as well as rigorous requirement on the mechanical property of the set cement.Laboratory study was conducted on the cement slurry to be sued and the techniques for performing the well cementing job.A functional pre-pad fluid with oil washing ability was selected for the cementing operation,more than 90%of the potassium salt drilling fluid can be washed off the borehole wall.According to the“four low one high”requirement by Dagang oilfield on cementing the shale oil reservoirs,a tough high strength anti-channeling cement slurry was selected.This cement slurry has transition time for static gelling of 5 min,high compressive strength,low elastic modulus,excellent anti-channeling performance and set cement with outstanding mechanical property.Prior to well cementing,wiper trip with“two centralizers”and“three centralizers”was implemented,the hole was cleaned with high-vis pill containing fibers,and pseudo mud cakes were removed.A set of techniques suitable for shale oil reservoir cementing in Dagang oilfield was established and successfully used in field operation.

关 键 词：页岩油 前置液 韧性 防窜 水泥浆 固井工艺 

分 类 号：TE256[石油与天然气工程—油气井工程]