四元体高强低密度纤维水泥体系的研制
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摘要
为了解决目前油井水泥拌合料配比设计困难的难题,进一步拓展漂珠微硅类低密度水泥体系的应用范围,基于颗粒级配增强、纤维增韧的技术思路,研制了颗粒级配增强材料KZ和早强剂ZR,并优选了长度为600μm和1050μm的化学改性纤维作为增韧材料,最终在1.15～1.45g/cm3范围内优化设计出4种不同密度的新型四元体低密度水泥体系,并对该体系的水泥石力学性能和浆体性能进行了系统评价.实验结果表明:四元体系强度明显高于目前现场使用的同一级别的低密度水泥,改性纤维的架桥阻裂作用可显著提高水泥石韧性,水泥浆失水量和游离液含量较低,防窜能力强,稠化和流变性能满足要求,体系稳定性好,验证了四元体系粒径分布的合理性.研究结果为多元体油井水泥体系设计提供了一条新途径.
To tackle with the difficulty in current solid mixture proportion design for oil well cement,and broaden the application range of low density cement system using floating potential and microsilica,the technical conception with particle size distribution for strength improvement and fiber for toughness enhancement was adopted. With the introduction of self-made reinforcing material KZ and early-strength toughening agent ZR,combining with the optimization of chemically modified fiber at the lengths of 600 μm and 1 050 μm as the toughness reinforcing material,four kinds of different new quaternary lightweight cement system were finally developed with the density ranging from 1.15 g/cm3 to 1.45 g/cm3. Meanwhile,systematic evaluation was conducted on the mechanical properties of set cement and the performance of cement slurry. Experimental results show that the quaternary systems have better strength than the currently employed lightweight cement systems of the same density in field, and the bridging and anti-fracturing function of imbedded fiber can significantly improve the toughness of set cement. The cement slurry shows lower fluid loss and free water content,favorable consistence development,strong anti-channeling ability,and good rheological property and stability. Hence,the rationality of particle size distribution for the developed quaternary system is validated. Research results offer a new approach for the formulation design of multivariate oil well cement system.
To tackle with the difficulty in current solid mixture proportion design for oil well cement,and broaden the application range of low density cement system using floating potential and microsilica,the technical conception with particle size distribution for strength improvement and fiber for toughness enhancement was adopted. With the introduction of self-made reinforcing material KZ and early-strength toughening agent ZR,combining with the optimization of chemically modified fiber at the lengths of 600 μm and 1 050 μm as the toughness reinforcing material,four kinds of different new quaternary lightweight cement system were finally developed with the density ranging from 1.15 g/cm3 to 1.45 g/cm3. Meanwhile,systematic evaluation was conducted on the mechanical properties of set cement and the performance of cement slurry. Experimental results show that the quaternary systems have better strength than the currently employed lightweight cement systems of the same density in field, and the bridging and anti-fracturing function of imbedded fiber can significantly improve the toughness of set cement. The cement slurry shows lower fluid loss and free water content,favorable consistence development,strong anti-channeling ability,and good rheological property and stability. Hence,the rationality of particle size distribution for the developed quaternary system is validated. Research results offer a new approach for the formulation design of multivariate oil well cement system.
引文
[1]刘崇建,黄柏宗,徐同台.油气井注水泥理论与应用[M].北京:石油工业出版社,2001.
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[4]周仕明.微硅漂珠复合低密度水泥体系的探讨[J].钻井液与完井液,1999,16(6):27-29.
[5]苑铭,刘秀成,李社坤.微硅复合低密度水泥浆的室内研究与应用[J].石油钻探技术,2001,29(5):36-38.
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[7]李坤,徐孝思,黄柏宗.紧密堆积优化水泥浆体系的优势与应用[J].钻井液与完井液,2002,19(1):1-9.
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[9]杜伟程,林恩平.固井纤维水泥的研究[J].钻井液与完井液,1997,14(5):11-13.
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[12]曾庆敦.复合材料的细观破坏机制与强度[M].北京:科学出版社,2002.
[2]韩卫华.漂珠对低密度水泥浆密度的影响[J].钻井液与完井液,2004,21(5):56-57.
[3]刘德平,钟策,王群,等.微硅密度水泥固井技术研究[J].天然气工业,2001,21(6):65-66.
[4]周仕明.微硅漂珠复合低密度水泥体系的探讨[J].钻井液与完井液,1999,16(6):27-29.
[5]苑铭,刘秀成,李社坤.微硅复合低密度水泥浆的室内研究与应用[J].石油钻探技术,2001,29(5):36-38.
[6]黄柏宗.紧密堆积理论优化的固井材料和工艺体系[J].钻井液与完井液,2001,18(6):1-8.
[7]李坤,徐孝思,黄柏宗.紧密堆积优化水泥浆体系的优势与应用[J].钻井液与完井液,2002,19(1):1-9.
[8]Hannant D J.纤维水泥与纤维混凝土[M].陆建业,译.北京:中国建筑工业出版社,1982.
[9]杜伟程,林恩平.固井纤维水泥的研究[J].钻井液与完井液,1997,14(5):11-13.
[10]王善元,张汝光.纤维增强复合材料[M].北京:中国纺织大学出版社,1998.
[11]钟启刚,李杨,卢东红.提高水泥环韧性的实验研究[J].地震工程与工程振动,1997,17(4):123-129.
[12]曾庆敦.复合材料的细观破坏机制与强度[M].北京:科学出版社,2002.
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