页岩气水平井固井技术难点分析与对策
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摘要
页岩气储层多为低孔低渗,需要采取压裂等增产措施沟通天然裂缝,所以对固井质量的要求很高。对页岩气水平井固井面临的套管下入与居中度、油基钻井液有效驱替和大型压裂对固井胶结质量的影响等技术难题进行深入分析,从有效通井、套管居中、套管漂浮固井技术、高效洗油冲洗液、采用弹韧性水泥浆体系等几个方面提出了提高页岩气水平井固井质量的技术对策,为今后页岩气水平井固井提供借鉴。
Owing to the low porosity and permeability of shale gas reservoir,fracturing and other measures to increase production need to be taken to connect natural fractures,which require higher quality of cementing.The major challenge for cementing horizontal shale gas wells are analyzed in depth,which is the effect to cementing quality from the concentric degree of the casing down into the hole,effective displacement by oil-based drilling fluid,and large-scale fracturing.The countermeasures of improving the cementing quality for horizontal shale gas wells are proposed from the aspects of effective drifting,casing centering,floating casing cementing technique,high efficiency oil washing fluid,slurry system with elastic toughness.It provides a reference for cementing horizontal wells in shale gas reservoirs.
Owing to the low porosity and permeability of shale gas reservoir,fracturing and other measures to increase production need to be taken to connect natural fractures,which require higher quality of cementing.The major challenge for cementing horizontal shale gas wells are analyzed in depth,which is the effect to cementing quality from the concentric degree of the casing down into the hole,effective displacement by oil-based drilling fluid,and large-scale fracturing.The countermeasures of improving the cementing quality for horizontal shale gas wells are proposed from the aspects of effective drifting,casing centering,floating casing cementing technique,high efficiency oil washing fluid,slurry system with elastic toughness.It provides a reference for cementing horizontal wells in shale gas reservoirs.
引文
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[3]张林晔,李政,朱月房.页岩气的形成及开发[J].天然气工业,2009,29(1):124-126.
[4]崔思华,班凡生,袁光杰.页岩气钻完井技术现状及难点分析[J].天然气工业,2011,3(14):72-74.
[5]裴建忠,刘天科,周飞,等.金平1浅层大位移水平井钻井技术[J].石油钻探技术,2009,3(71):87-90.
[6]冯京海,郝新朝,白亮清,等.冀东油田水平井固井技术[J].石油钻采工艺,2007,2(9S0):32-34.
[7]佟岩,程福全.浅谈大位移井固井技术[J].化学工程与装备,2011,38(4):65-66.
[8]王祥林,王允良,王立平,等.射孔对水泥环损伤的综合试验研究[J].地震工程与工程振动,1994,14(1):90-91.
[9]李早元,郭小阳,韩林,等.胶乳对水泥石三轴力学形变能力的作用[J].石油学报,2007,2(84):126-129.
[10]李维,李黔.大位移水平井下套管漂浮接箍安放位置优化分析[J].石油钻探技术,2009,3(73):53-56.
[11]陈建兵,安文忠,马健.套管漂浮技术在海洋钻井中的应用[J].石油钻采工艺,2001,2(35):19–22.
[12]谭春勤,刘伟,丁士东,等.SFP弹韧性水泥浆体系在页岩气井中的应用[J].石油钻探技术,2011,3(93):53-56.
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