顺南5-1井回接双级固井井筒完整性分析
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摘要
塔河油田顺南5-1井设计采用?177.8 mm回接双级固井工艺,一级固井后未能建立二级循环通道,导致无法进行二级固井作业。为确保该井井筒完整性,基于机械式双级箍结构及工作原理,下两趟钻分别进行下压开孔及下压关孔作业,经过分析排除地面设备及双级箍原因造成无法建立二级固井循环通道的可能性,确定此复杂情况产生的原因是一级固井水泥浆领浆因长时间静止而稠化后失去流动性。基于分析结果对回接双级固井工艺进行改进,优化套管扶正器安放,固完井后先进行回接插入完成分级箍开孔后再进行芯轴式悬挂器坐挂,固井前做好水泥浆性能测试,可有效避免此类问题的再次发生,为此类井筒完整性问题的解决提供了有利借鉴。
?177.8 mm tie back double-stage cementing technology is adopted in the design of Well Shunnan 5-1 in Tahe Oilfield. Second-stage circulation passage isn't formed after first-stage cementing, so second-stage cementing cannot be carried out. Based on the structure and working principle of double-stage mechanical collar, two trips were conducted for downward tapping and downward closing respectively so as to guarantee its well integrity. Based on analysis, it is eliminated that ground equipment and double-stage collar are the reasons for the failed formation of circulation passage of two-stage cementing, and it is determined that the reason for this complex situation is that the lead slurry of first-stage cementing slurry cannot flow after it is thickened due to long-time stillness. According to the analysis results, the tie back double-stage cementing technology is improved and the setting of the casing centralizer optimized. It is recommended to carry out tie-back insertion for the tapping of stage collar after cementing completion, and then set the mandrel hanger. And the properties of slurry shall be tested before the cementing, so that the similar complex situations can be avoided effectively. The research results provide the valuable reference for the solution of similar well integrity.
?177.8 mm tie back double-stage cementing technology is adopted in the design of Well Shunnan 5-1 in Tahe Oilfield. Second-stage circulation passage isn't formed after first-stage cementing, so second-stage cementing cannot be carried out. Based on the structure and working principle of double-stage mechanical collar, two trips were conducted for downward tapping and downward closing respectively so as to guarantee its well integrity. Based on analysis, it is eliminated that ground equipment and double-stage collar are the reasons for the failed formation of circulation passage of two-stage cementing, and it is determined that the reason for this complex situation is that the lead slurry of first-stage cementing slurry cannot flow after it is thickened due to long-time stillness. According to the analysis results, the tie back double-stage cementing technology is improved and the setting of the casing centralizer optimized. It is recommended to carry out tie-back insertion for the tapping of stage collar after cementing completion, and then set the mandrel hanger. And the properties of slurry shall be tested before the cementing, so that the similar complex situations can be avoided effectively. The research results provide the valuable reference for the solution of similar well integrity.
引文
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[3]李风雷,杜鹏德.尾管回接固井常见问题分析及对策[J].西部探矿工程,2016(2):94-96.LI Fenglei,DU Pengde.Issues and solutions of tie back liner cementing[J].West-China Exploration Engineering,2016(2):94-96.
[4]马开华,马兰荣,陈武君.高压油气井尾管回接固井新技术[J].石油钻采工艺,2005,27(3):22-23.MA Kaihua,MA Lanrong,CHEN Wujun.New liner tieback cementing technology in high-pressure gas-oil wells[J].Oil Drilling&Production Technology,2005,27(3):22-23.
[5]郑杜建,代红涛,张晋凯,高剑伟.顺南区块超高温高压双级回接固井工艺技术研究[J].石油矿场机械,2017,46(2):69-73.ZHENG Dujian,DAI Hongtao,ZHANG Jinkai,GAOJianwei.Two stage tieback cementing technological research for super high temperature and pressure in Shunnan Block[J].Oil Field Equipment,2017,46(2):69-73.
[6]阮臣良,李富平,李风雷,马锦明.尾管悬挂器超高压封隔及回接技术应用研究[J].长江大学学报(自科版),2016,13(19):42-45.RUAN Chenliang,LI Fuping,LI Fenglei,MA Jinming.Application of ultra-high pressure ZXP packer and tieback technology[J].Journal of Yangtze University(Natural Science Edition),2016,13(19):42-45.
[7]王沫,杜欢,伊尔齐木,白彬珍,邹书强,马宏原.顺南井区优快钻井技术[J].石油钻探技术,2015,43(3):50-54.WANG Mo,DU Huan,EERQM,BAI Binzhen,ZOUShuqiang,MA Hongyuan.Optimal and fast drilling technology for Shunnan Block[J].Petroleum Drilling Techniques,2015,43(3):50-54.
[8]秦金丽,赵斌,阮臣良.系列新型双级注水泥器的设计与应用[J].石油钻探技术,2007,35(6):79-81.QIN Jinli,ZHAO Bin,RUAN Chenliang.Design and application of a novel two-stage cementing collar[J].Petroleum Drilling Techniques,2007,35(6):79-81.