低返速固井对油井水泥浆性能的影响
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摘要
针对塔里木油田库车山前超高压气井四开、五开尾管低返速固井水泥浆在注替过程中流动速度低、升温速度慢、可能影响其水化反应速度的问题,研究了低返速固井条件所致低搅拌速度对其超高密度水泥浆性能的影响及其作用机理。研究结果表明,在低返速固井条件下:水泥浆的水化反应速度及进程放缓,致使其稠化时间大幅延长,为此更容易导致封固段顶部水泥浆超缓凝的问题;悬浮稳定性基本不受影响,甚至有一定的改善;14 d抗压强度小幅降低,但28 d抗压强度基本不受影响;从而为国内外类似区块固井合理优选水泥浆体系、减少缓凝剂用量、降低水泥浆配方调试难度、减少封固段顶部水泥浆超缓凝的问题提供了新的理论依据和技术手段。
During liner cementing in the fourth and fifth intervals of ultrahigh pressure gas wells drilled in the piedmont structure in Kuche county, Tarim basin, the hydration reaction speed of the cement is probably affected by its low return flowrate and slow temperature rise during pumping and displacement. To resolve this problem, laboratory study was conducted on the effect of low agitating speed resulted from low return flowrate on the performance of ultra-high-density cement slurries. The study result showed that at low return flowrate, the hydration reaction speed and the reaction process of a cement slurry become slow, resulting in great extension of the thickening time of the cement slurry, which in turn results in ultra-retarding of the top cement slurry in annular space. The suspension performance of the cement slurry was basically not affected by the low return flowrate, and to some extent, the low return flowrate even helped improve the suspension performance. The 14 d compressive strength of the set cement was slightly reduced, while the 28 d compressive strength of the set cement was basically not affected by the low return flowrate. The results of this study will provide a new theoretical basis and technical means to select cement slurry formulation for well cementing in similar conditions, minimize the amount of retarding agents required, make it easier to formulate cement slurry, and mitigate the ultra-retarding problem of the top cement in annular space.
During liner cementing in the fourth and fifth intervals of ultrahigh pressure gas wells drilled in the piedmont structure in Kuche county, Tarim basin, the hydration reaction speed of the cement is probably affected by its low return flowrate and slow temperature rise during pumping and displacement. To resolve this problem, laboratory study was conducted on the effect of low agitating speed resulted from low return flowrate on the performance of ultra-high-density cement slurries. The study result showed that at low return flowrate, the hydration reaction speed and the reaction process of a cement slurry become slow, resulting in great extension of the thickening time of the cement slurry, which in turn results in ultra-retarding of the top cement slurry in annular space. The suspension performance of the cement slurry was basically not affected by the low return flowrate, and to some extent, the low return flowrate even helped improve the suspension performance. The 14 d compressive strength of the set cement was slightly reduced, while the 28 d compressive strength of the set cement was basically not affected by the low return flowrate. The results of this study will provide a new theoretical basis and technical means to select cement slurry formulation for well cementing in similar conditions, minimize the amount of retarding agents required, make it easier to formulate cement slurry, and mitigate the ultra-retarding problem of the top cement in annular space.
引文
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[11]李晓春,李坤,刘锐,等.塔里木盆地超深天然气井全过程塞流防漏注水泥技术[J].天然气工业,2016,36(10):102-109.LI Xiaochun,LI Kun,LIU Rui,et al.Plug flow based full-process leakage-proof cementing technology for ultradeep gas wells in the Tarim basin[J].Nature Gas Industry,2016,36(10),102-109.
[12]于永金,刘硕琼,袁进平,等.高温条件下水泥浆沉降稳定性的评价方法[J].钻井液与完井液,2011,28(6):52-54.YU Yongjin,LIU Shuoqiong,YUAN Jinping,et al.Study on evaluation methods of sedimentation stability of cement slurry in high temperature[J].Drilling Fluid&Completion Fluid,2011,28(6):52-54.
[13]杨智光,崔海清,肖志兴.深井高温条件下油井水泥强度变化规律研究[J].石油学报,2008,29(3):435-437.YANG Zhiguang,CUI Haiqing,XIAO Zhixing.Change of cement stone strength in the deep high temperature oil well[J].Acta Petrolei Sinica,2008,29(3):435-437.
[2]张民立,艾正青,王威,等.高陡构造“三高、窄窗口”地层克深15井钻井液技术[J].钻井液与完井液,2016,33(5):25-29.ZHANG Minli,AI Zhengqing,WANG Wei,et al.Drilling fluid technology for well Keshen-15 penetrating highly deep HTHP gypsum formations[J].Drilling Fluid&Completion Fluid,2016,33(5):25-29.
[3]庄建山,宋元洪,高飞,等.塔里木山前区块超深井尾管塞流固井技术[J].钻井液与完井液,2016,33(4):83-86.ZHUANG Jianshan,SONG Yuanhong,GAO Fei,et al.Plug flow liner cementing technology for ultra deep well in piedmont Tarim[J].Drilling Fluid&Completion Fluid,2016,33(4):83-86.
[4]周健,刘永旺,贾红军,等.库车山前巨厚盐膏层提速技术探索与应用[J].钻采工艺,2017,40(1):21-24.ZHOU Jian,LIU Yongwang,JIA Hongjun,et al.Study to improve rop in thick salt-gyp-sum layers at Kuche piedmont area[J].Drilling&Production Technology,2017,40(1):21-24.
[5]李早元,支亚靓,邓智中,等.库车山前井防漏固井方法技术研究[J].钻井液与完井液,2015,32(3):55-58.LI Zaoyuan,ZHI Yaliang,DENG Zhizhong,et al.Technology for lost circulation control during well cementing in piedmont wells[J].Drilling Fluid&Completion Fluid,2015,32(3):55-58.
[6]李健,李早元,辜涛,等.塔里木山前构造高密度油基钻井液固井技术[J].钻井液与完井液,2014,31(2):51-54.LI jian,LI Zaoyuan,GU Tao,et al.Technology for wells drilled with high density oil base drilling fluid in piedmont structure of Tarim basin[J].Drilling Fluid&Completion Fluid,2014,31(2):51-54.
[7]袁中涛,杨谋,艾正青,等.库车山前固井质量风险评价研究[J].钻井液与完井液,2017,34(6):89-94.YUAN Zhongtao,YANG Mou,AI Zhengqing,et al.Risk evaluation of cementing job quality of wells drilled in Kuche piedmont structure[J].Drilling Fluid&Completion Fluid,2017,34(6):89-94.
[8]李早元,杨绪华,郭小阳,等.固井前钻井液地面调整及前置液紊流低返速顶替固井技术[J].天然气工业,2005,25(1):93-95.LI Zaoyuan,YANG Xuhua,GUO Xiaoyang,et al.Cementing techniques of ground adjusting drilling fluid properties before cementing and displacing mud by turbulent pre-flush at low return velocity[J].Natural Gas Industry,2005,25(1):93-95.
[9]刘崇建,刘孝良,刘乃震,等.提高小井眼水泥浆顶替效率的研究[J].天然气工业,2003,23(2):46-49.LIU Chong jian,LIU Xiaoliang,LIU Naizhen,et al.Research on raising slurry displacing efficiency in a slim hole[J].Natural Gas Industry,2003,23(2):46-49.
[10]冯望生,宋伟宾,郑会锴,等.剪切速率对水泥浆稠化时间的影响规律[J].石油钻探技术,2016,44(6):74-77.FENG Wangsheng,SONG Weibin,ZHENG Huikai,et al.The influence law of shear rate on the thickening time of cement slurry[J].Petroleum Drilling Techniques,2016,44(6):74-77.
[11]李晓春,李坤,刘锐,等.塔里木盆地超深天然气井全过程塞流防漏注水泥技术[J].天然气工业,2016,36(10):102-109.LI Xiaochun,LI Kun,LIU Rui,et al.Plug flow based full-process leakage-proof cementing technology for ultradeep gas wells in the Tarim basin[J].Nature Gas Industry,2016,36(10),102-109.
[12]于永金,刘硕琼,袁进平,等.高温条件下水泥浆沉降稳定性的评价方法[J].钻井液与完井液,2011,28(6):52-54.YU Yongjin,LIU Shuoqiong,YUAN Jinping,et al.Study on evaluation methods of sedimentation stability of cement slurry in high temperature[J].Drilling Fluid&Completion Fluid,2011,28(6):52-54.
[13]杨智光,崔海清,肖志兴.深井高温条件下油井水泥强度变化规律研究[J].石油学报,2008,29(3):435-437.YANG Zhiguang,CUI Haiqing,XIAO Zhixing.Change of cement stone strength in the deep high temperature oil well[J].Acta Petrolei Sinica,2008,29(3):435-437.
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