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页岩气水平井低密度防窜水泥浆增稠机理研究
Study on thickening mechanism of low-density anti-fluid-channeling cement slurry for horizontal shale gas wells
郝海洋, 屈勇, 何吉标, 张家瑞, 刘俊君
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作者单位:中石化江汉石油工程有限公司页岩气开采技术服务公司
中文关键字:低密度水泥浆,漂珠,增稠,降粘
英文关键字:low-density cement slurry, hollow-microsphere, thickening mechanism, viscosity reduction
中文摘要:针对涪陵页岩气加密井遇到地层漏、承压低问题,优化设计了一种以漂珠为主要减轻剂的低密度水泥浆体系,该体系水泥浆具有浆体稳定、失水低、流变性好、稠化时间可控等优点。然而在稠化实验升温升压初始阶段,出现了稠度快速增大现象,为注水泥施工带来了安全隐患。稠化实验结果表明:在升温升压前5 min内,浆体稠度快速增加;从5 min到升压升温程序结束,稠度增加缓慢而趋于稳定。流变测试结果表明:常压条件下,温度升高不会导致浆体增稠。影响浆体增稠因素分析发现:压力增大是外因,漂珠破碎是内因,窝存在破碎漂珠中的气体侵入和漂珠受压破碎而导致的气体释放是造成了浆体稠度快速增大的主要因素。选择合适的强效消泡剂、流型调节剂和高强度漂珠可以减缓漂珠低密度防窜水泥浆体系初始稠度增大的程度。
英文摘要:Formation leakage and low pressure are often encountered in the horizontal shale gas infill wells in Fuling Area. A kind of low-density cement slurry system with hollow-microsphere as the main lightening agent is optimized and designed, which has the advantages of good sedimentation stability, low fluid loss, good rheological property and controllable thickening time. However, in the initial phase of temperature and pressurizing increasing, the consistency increases rapidly, which brings safety risk for cementing operation. The thickening experiment results show that within 5 min in the temperature rise and pressure increasing stage, the slurry consistency increased rapidly. From 5 min to the end of the step-up procedure, the consistency increased slowly and tended to be stable. The rheological test results show that under normal pressure, temperature rise will not lead to slurry thickening. The analysis of the factors affecting slurry consistency show that the pressure increase is the external cause, while the breakage of hollow-microsphere is the internal cause. It can be deduced that the gas intrusion which sheltering in the broken hollow-microsphere and the gas release which is caused by the and the crushing of the hollow-microsphere were the main factors causing the slurry consistency to increase rapidly. The selection of appropriate high-effect defoaming agent, flow type regulator agent and high-strength hollow-microsphere can slow down the degree of initial consistency of cement slurry system.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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