保护碳酸盐储层的酸化完井液体系研究

发布时间：2018-06-22 11:00

本文选题：完井液 + 钻开液　；参考：《油田化学》2017年01期

【摘要】：针对伊拉克Missan油田碳酸盐储层的特点,以腐蚀性较弱的HTG固体酸为主剂,采用NaCl、HCOONa复合盐水调节密度并加入一定量缓蚀剂制备了一种保护碳酸盐储层的酸化完井液体系:25%NaCl+10%HCOONa+3%HTG固体酸+3%JCI缓蚀剂,考察了该完井液对钻开液泥饼的冲洗能力、破胶能力,研究了完井液与钻开液滤液的配伍性以及完井液对储层的保护作用。结果表明,该酸化完井液体系腐蚀性较小,能够有效地清除钻开液形成的泥饼,在无完井破胶处理的条件下能将泥饼的残渣全部清除;钻开液污染后的岩心经该完井液体系处理后的渗透率恢复率可达95%以上,显示该完井液具有较好的储层保护作用。
[Abstract]:In view of the characteristics of carbonate reservoirs in Missan Oilfield, Iraq, HTG solid acid is used as the main agent. Using NaCl-HCOONa complex brine to regulate the density and add a certain amount of corrosion inhibitor, a kind of acidified completion liquid system of 1: 25 NaCl 10 and 10 HCOONa3HTG solid acid and HTG solid acid 3JCI corrosion inhibitor was prepared to protect carbonate reservoir. The washing ability and gel breaking ability of the completion fluid to the mud cake of drilling fluid were investigated. The compatibility of completion fluid and drilling fluid filtrate and the protective effect of completion fluid on reservoir were studied. The results show that the acidified completion fluid system is less corrosive and can effectively remove mud cake formed by drilling fluid, and the residue of mud cake can be completely removed under the condition of no gel breaking treatment. The permeability recovery rate of the core contaminated by drilling fluid can reach more than 95%, which indicates that the well completion fluid has better reservoir protection.
【作者单位】：中国海油伊拉克有限公司;长江大学石油工程学院;
【分类号】：TE257.6

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