北极地区低温防气窜固井技术研究与应用  

Research and Application of Cementing Technology for Anti-gas Channeling at Low Temperature in the Arctic

作　　者：王建伟 袁继胜 李晓维 孟普伟 蒋毅 Wang Jianwei;Yuan Jisheng;Li Xiaowei;Meng Puwei;Jiang Yi(Zhongman Petroleum and Natural Gas Group,Ltd.,Shanghai 201306)

机构地区：[1]中曼石油天然气集团股份有限公司,上海201306

出　　处：《中外能源》2020年第9期56-59,共4页Sino-Global Energy

基　　金：上海市经济和信息化委员会“2019年上海市产业技术创新项目企业创新能力提升专题”之“北极地区水平井钻井关键技术研究”(编号:JJ-YJCX-01-19-2397)。

摘　　要：针对北极地区冻土层厚,井底温度低,常规水泥浆凝固时间长,强度发展慢;储气层厚,埋深浅,可采层位多,地层压力高,防气窜难;储层孔隙大和渗透率高,胶结差,易漏失;油基泥浆难驱替等影响固井质量的技术难题,通过优选材料和大量室内实验开发了以低温胶凝剂RC090-01、降失水剂Cem-1、早强剂Atren light和防气窜剂RC021-09等材料组成的低温防气窜水泥浆,在低温下凝固时间短,强度发展快,具有防漏堵漏功能及良好的防气窜能力,符合冻土层低温防气窜固井的技术要求。应用驱油冲洗液及冲洗型隔离液技术,采用符合地层承压能力的变排量顶替技术,提高了顶替效率,改善了界面胶结,提高了固井质量,从而形成了北极地区低温防气窜固井技术,在哈拉姆布尔气田累计完成了20口井的施工作业,固井质量全部合格,优质率在85%以上,彻底解决了固井质量问题。For the thick permafrost layers in the arctic,conventional cement slurry has a long setting time and strength formed at slow speed at low temperature.It ′ s hard to anti-gas channeling for thick gas reservoirs,shallow burial depth,more recoverable layers and high formation pressure.Large porosity and high perme-ability in the reservoirs result in weak cementing and being easy to leak.There is low displacement efficiency in oil-based mud and other technical problems affecting the quality of cementing.In view of the above,a set of anti-gas channeling cement slurry at low temperature is developed that makes of low temperature gellant RC090-1,filtration-reducing agent Cem-1,accelerator Atren light and anti-gas channeling agent RC021-09,etc.It has the capability of lost circulation control and anti-gas channeling for its fast setting time and strength development at low temperature.It meets the technical demands of well cementing at low temperature for anti-gas channeling in the permafrost layers.After the application of oil displacement flushing fluid,flushing spacer technology and variable pressurized displacement technology,displacement efficiency,interfacial cementing and well cementing quality are improved.And low-temperature anti-gas channeling cementing technology is formed in the Arctic.The technology is applied to 20 wells in Harampur Gas Field,and the cementing quality is qualified with more than 85% of the high-quality rates,which completely solves the problems of the cementing quality.

关 键 词：冻土层 固井 低温 防气窜 顶替效率 

分 类 号：TE256[石油与天然气工程—油气井工程]