摘要
根据行业标准规范要求,为防止油套管生产环空带压或高产井生产时井口抬升剧烈,开发井生产套管固井宜采用单级全封方式。东海西湖花港组下段、平湖组油气藏埋深较深,X7井长裸眼井段固井全封固作业技术难度较大,工具材料组织、现场施工程序繁琐,且还受以下因素影响:油基钻井液油膜、泥饼难以彻底清除,对冲洗液、前置液性能要求高;裸眼井段压力体系复杂,对水泥浆体系和水泥浆柱压稳防窜要求高,候凝期间水泥胶凝失重导致浆柱静液压力下降更易发生气窜;防漏要求高,上部龙井组或平湖组煤层等薄弱层位易发生井漏复杂情况。受井身结构、套管偏心等诸多因素影响,固井顶替效率难以提高。因此,该井采取水泥浆体系优选、冲洗设计、环空静态及动态压力计算、顶替流变参数模拟及套管居中度模拟六项施工控制核心技术。生产运行方面精心组织筹备、制定标准化固井作业程序及应急管控措施,最终取得优良的固井质量。
According to the requirements of industry standards and specifications,in order to prevent a production-well annular pressure increasing of poor cementing quality,single-stage cementing should be used for production casing cementing in development wells.The vertical depth of reservoirs in the under member of Huagang Formation and Pinghu Formation in Xihu Sag is deep.Therefore,the technical difficulty of full-sealing and cementing of long open-hole section of Well X7 is difficult,the organization of tool materials and on-site construction procedures are cumbersome,and also affected by the following factors:oil film and mud cake of oil-based drilling fluid is difficult to be removed completely,and the performance requirements of flushing fluid and pre-fluid are high.The pressure system of open hole section is complex,and the pressure stability of cement slurry system and cement slurry column is required to prevent channeling,so the loss of weight of cement gelation leads to the decrease of static hydraulic pressure of cement,which is easy to occur gas channeling.The requirements for leakage prevention are high,and the weak layers such as the upper member of Longjing Formation or Pinghu Formation coal seam are prone to complex lost circulation.Affected by many factors such as well structure and casing eccentricity,it is difficult to improve the cementing displacement efficiency.Therefore,this well adopts six core construction control technologies:optimization of cement type,flushing design,annular static and dynamic pressure calculation,displacement rheological parameter simulation and intermediate simulation.In terms of production and operation,we have carefully organized preparations,formulated standardized cementing procedures emergency control measures,and finally achieved excellent cementing quality.
作者
曹松
白玉洪
王建红
黄佩
曹太云
CAO Song;BAI Yuhong;WANG Jianhong;HUANG Pei;CAO Taiyun(Shanghai Special Operation Branch,SINOPEC Offshore Oil Engineering Company,Shanghai 200120,China)
出处
《海洋石油》
CAS
2022年第2期77-82,共6页
Offshore Oil
关键词
生产井
长裸眼油气层井段
单级全封固井
production well
long open-hole oil and gas reservoirs
single-stage full-sealing and cementing
