阿姆河复杂地层钻井井控技术

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英文篇名：WELL CONTROL TECHNOLOGY FOR COMPLEX FORMATIONS AT AMU DARYA AREA 作者：许期聪 ; 林平 英文作者：XU Qicong;LIN Ping;International Engineering Company,CNPC Chuanqing Drilling Engineering Company Limited; 关键词：阿姆河 ; 井控技术 ; 井漏 ; 井喷 ; 盐膏层 ; 固井 英文关键词：Amu Darya;;well control technology;;lost circulation;;blowout;;salt-gypsum layer;;cementing 中文刊名：钻采工艺 英文刊名：Drilling & Production Technology 机构：中国石油川庆钻探国际工程公司; 出版日期：2019-05-25 出版单位：钻采工艺 年：2019 期：03 基金：国家“十二五”重大专项“阿姆河右岸中区天然气开发示范工程”(编号:2011ZX05059) 语种：中文; 页：7+36-38 页数：4 CN：51-1177/TE ISSN：1006-768X 分类号：TE28

摘要

阿姆河地区地质条件复杂,盐膏层厚度大,目的层压力敏感、安全密度窗口窄、高含硫化氢,裂缝断裂发育,极易发生井漏或恶性井漏并引发漏喷转换,且转换速度快,关井压力高,部分地区还存在"人工次生浅气藏",钻井井控风险极大,前苏联在该地区的钻井事故频发,成功率仅为30%。文章通过对阿姆河地区钻井地质特征及钻井难点的分析,总结、提炼出了川庆钻探在阿姆河地区钻井过程中形成的一系列对付"人工次生浅气藏"、高压盐膏层、窄密度窗口储层等安全钻井的井控技术,在120余口井的钻探中,未发生过一次井喷事故,钻井成功率100%。其中"人工次生浅气藏"的安全钻井技术及反推法处理高压盐水的压井技术具有独特性、新颖性,具有较强的针对性及可操作性,对其它油田在类似地层的钻井具有较好的指导作用。
        The geologic conditions at Amu Darya area are complicated,with thick salt-gypsum,pressure sensitive payzones,narrow mud window,high concentration of hydrogen sulfide,developed fractures and faults,frequently occured losses or extremely severe losses,easily and very quickly converted losses and kicks,high well shut-in pressure,artifical secondary shallow gas reservoir,high well control risk during drilling,and etc.Drilling accidents occured very frequently in this area by former Soviet Union,with a success rate of only 30%. Based on the analysis of drilling geological characteristics and drilling difficulties in Amu Darya River area,in this paper a series of well control techniques solving the difficulties is summed up. And there is no blowout accidents during its application in 120 wells,the success rate of drilling is 100%. Among them,the safe drilling technology for " artificial secondary shallow gas reservoir" and the bull heading method used for high-pressure brine formation are unique and novel,which can be a good guide for similar formations at other oilfields.

引文

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