第33卷第4期 2016年7月
钻井液与完井液
DRILLINGFLUID&COMPLETIONFLUID
doi : 10.3696/j.issn.1001-5620.2016.04.016
大庆油田低密度低温防窜水泥浆体系
侯力伟
（大庆钻探工程公司钻井工程技术研究院，黑龙江大庆100142）
候力伟，大庆油田低密度低温防窜水泥浆体系[J].钻井液与完井液，2016，33（4)：79-82.
Vol.33No.4 July2016
摘要针对大庆油田低温浅层气井长封段固井中，低密度水泥浆终凝时间长，胶凝强度发展缓慢，失水大，防窜性能差，易产生环空气窜及管外胃气等现象，影响了固井质量。研究了低密度低温防窜水泥浆体系，采用复合型早强剂、聚两烯酸酯聚合物胶乳降失水剂、可分散聚合物胶粉防窜剂，改善低密度水泥蒙综合性能，在低温条件下，凝结时间缩短了50%，早期强度提高了46%，渗透率降低了50%，界面胶结强度提高了47%。现场应用18口并，固并优质率提高了11.1%，管外雷发生率降低了1.6%，低密度低温防窜水泥浆体系能够满足固井施工作业要求，提高了低温浅层长封并固井质量。
关键词低密度；复合型早强剂；防审水泥浆；胶凝强度；固并质量
中图分类号：TE256.6
文献标识码：A
文章编号：1001-5620（2016）04-0079-04
LowDensityLowTemperatureAnti-ChannelingCementSlurryUsed inDaqingOilfield
HOU Liwei
(Research InstituteofDrillingEngineeringTechnology,DaqingDrillingEngineeringCorporation,
Daqing, Heilongjiang 163413)
Abstract In commenting the long, low temperature wellbore with shallow gases in Daqing, the low density cementing slurries used had long final setting time, slowly developing gel strengths, high filter loss, and poor anti-channeling performance, All these factors saooeaseaiaoesee low density low temperature anti-channeling cement slurry, the cement slurry was treated with a compound early strength agent, a polyacrylate filter loss reducer and a dispersible polymer anti-channeling agent, all being used to improve the overall performance of the slurry. At low temperatures, the setting time was shortened by 50%, the ecarly strength increased by 46%, permeability reduced by 50%, and the bond strength of the interface enhanced by 47%. The cement slurry formulation has been used in 18 wells, and 11.1% of the cementing jobs were of excellent quality, bubbling outside the casing string was reduced by 1.6%. The use of the low density low temperature anti-channeling cement slurry improved the quality of the cementing jobs.
Key words Low density; Compound early strength agent; Anti-channeling cement slurry; Gel strength; Cementing quality
大庆油田从北到南，存在浅气层、气顶气层的区块较多，埋深在100～800m之间，部分浅气区域内已上窜至100m以上井段，并且部分油水井存在着易漏层、高压层、浅气层共存的问题，在钻井过程中多次发生过井喷、管外冒等事故，为降低钻完井施工的风险和井控难度，采用低密度水泥浆封固上部浅气层。但使用低密度水泥浆时，在低温30℃以下，受到低密度水泥石凝结时间长，早
期强度发展缓慢、防窜性能差，界面胶结强度低等因素的影响下(2-3，低温浅层固井质量难以保证，固井施工及后续作业中发生油气水侵、管外冒事故频发。据统计，萨南区块浅层气井复杂发生率达到 26.3%，增加了安全和环境保护的压力，影响了油田生产开发。
为此研究了复合型早强剂，采用该早强剂能够缩短水泥浆的凝结时间，提高水泥石早期强度。采
作者简介：侯力伟，工程师，工学学士，1979年生，现在从事钻完井技术研究工作。电话（0459）4985582；E-mail：
houliwei@cnpc.com.cn。万方数据