渤海油田小间隙环空固井技术及应用
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摘要
为实现井身结构优化的推广应用,针对渤海油田小间隙环空固井技术难点,通过外掺料或外加剂优选,研发形成了一套具有"低摩阻、低密、低弹性模量"特点的水泥浆体系,密度1.50～1.90g/cm3可调,并对其基本工程性能和力学性能进行了评价。评价结果表明,该体系具有低至3.19GPa的弹性模量在小间隙环空中水泥环较薄的情况下也能很好地保持水泥环力学完整性不受破坏。同时形成了以PC-S32S为主剂隔离液的井眼净化和尽可能多的加放一体化弹性扶正器的套管居中等固井工艺技术。该项技术已在渤海油田成功应用多口井,解决了因井身结构优化带来的小间隙环空固井问题,保障固井质量,节约投资成本,具有较好的推广应用前景。
In order to realize the extension and application of well structure optimization,through the admixture or additive selection,a set of cement slurry system with"low friction,low density,low elastic modulus"characteristics has been researched and developed.Its density is adjustable from 1.50～1.90 g/cm3.And its basic engineering performance and mechanical performance were evaluated.The evaluation results showed that the system has the characteristics of low elastic modulus and can keep the integrity of cement ring mechanics intact in the case of thin air cement ring.At the same time,an isolation liquid with PC-S32 Sas the main agent was formed to ensure the well cleaning.As much as possible,we can ensure that the casing is in medium cementing technology.This technology has been successfully applied to several wells in Bohai oilfield.It shows that it can solve small annular clearance cementing problem well,guarantee the cementing quality,save the investment cost,which has great significance to realize cost decreasing and benefit increasing.
In order to realize the extension and application of well structure optimization,through the admixture or additive selection,a set of cement slurry system with"low friction,low density,low elastic modulus"characteristics has been researched and developed.Its density is adjustable from 1.50～1.90 g/cm3.And its basic engineering performance and mechanical performance were evaluated.The evaluation results showed that the system has the characteristics of low elastic modulus and can keep the integrity of cement ring mechanics intact in the case of thin air cement ring.At the same time,an isolation liquid with PC-S32 Sas the main agent was formed to ensure the well cleaning.As much as possible,we can ensure that the casing is in medium cementing technology.This technology has been successfully applied to several wells in Bohai oilfield.It shows that it can solve small annular clearance cementing problem well,guarantee the cementing quality,save the investment cost,which has great significance to realize cost decreasing and benefit increasing.
引文
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[3]安磊.渤海油田打造“质量效益年”[N].中国海洋石油报,2016-4-13(1).
[4]高永华,龙江桥,司念亭,等.低油价状态下渤海自营油田井下作业新模式的探索与实践[J].中国石油和化工标准与质量,2016,21(5):1-6.
[5]张凯,李明,刘小利,等.国内外小井眼固井技术研究现状[J].钻采工艺,2015,38(2):23-26.
[6]黄柏宗,吕光明,刘平.小井眼固井技术[J].钻井液与完井液,1999,16(2):28-34.
[7]刘阳.威远地区页岩气水平井固井技术研究与应用[J].非常规油气,2017,4(3):93-98.
[8]段永贤,秦宏德,乐法国,等.塔里木油田深井小间隙尾管固井难点及对策[J].石油天然气学报(江汉石油学院学报),2005,27(6):891-892.
[9]何生辉,高俊奎,牛庆华.小井眼固井技术[J].钻采工艺,2006,29(4):12-13.
[10]许杰,刘小刚,崔治军,等.复杂条件下小井眼固井技术在科探井中的应用[J].石油钻采工艺,2012,34(S0):23-25.
[11]孟庆拥,秦文革.小井眼固井工艺技术研究及现场应用[J].石油天然气学报(江汉石油学院院报),2005,27(1):217-218.
[12]王波,侯云翌,张文哲,等.盐膏层高密度固井水泥浆性能研究[J].非常规油气,2017,4(6):105-108.
[13]钟福海,王合林,单保东,等.开窗侧钻井小井眼小间隙固井技术[J].钻井液与完井液,2015,32(1):90-92.
[14]史为纪,卢亚峰,胡慧芳.大牛地气田小间隙井眼固井工艺[J].断块油气田,2009,16(1):92-94.
[15]GB/T 19139-2012.油井水泥试验方法[S].北京:中国标准出版社,2013:1-5.
[16]丁岗,倪红坚,武红卫,等.胶乳对油井水泥浆作用机理的实验研究[J].石油大学学报(自然科学版),2001,25(2):16-19.
[17]高辉,彭志刚.胶乳水泥浆的室内研究与应用[J].钻井液与完井液,2011,28(4):54-56.
[18]何树山,岳发辉.歧深1井高温深层小间隙尾管固井技术[J].天然气工业,2008,28(7):49-51.