吉林乾安油田低渗透储层损害机理研究

发布时间：2018-04-21 15:52

本文选题：乾安区块 + 滤液侵入损害　；参考：《东北石油大学》2015年硕士论文

【摘要】：随着油气资源需求的日益增长,勘探开发发育较差的低孔低渗油气藏成为增加油气产量的重要措施之一。本文主要针对乾安区块黑帝庙和高台子等低孔、低渗储层进行储层损害机理的研究。通过室内实验研究结果发现,该地区青三段黑帝庙层和嫩四段高台子储层孔隙度和渗透率值很小,均属于发育较差的低孔低渗油层。研究储层中粘土矿物绝对含量小于5%,均未发现蒙脱石。黑帝庙储层存在中等偏弱酸敏性和水(盐)敏性以及弱速敏和弱碱敏性,高台子储层存在中等偏弱速敏性,弱水敏性,弱盐敏、酸敏及碱敏性,主要的损害方式为水锁损害,水锁损害率在10.71%~15.38%。在实验研究的基础上,建立了描述滤液侵入损害的数学模型,进行数值计算计算。通过模型得到的储层渗透率恢复值与实验测得渗透率恢复值相一致,误差不超过10%。针对研究区块水锁损害严重的问题,室内优选了防水锁剂FHB-10,最优加量为2%,最后对钻井液体系进行改善。室内实验研究结果表明,改善后的钻井液储层保护效果显著,渗透率恢复值达到91.40%,是一种低侵入、低伤害的优质钻井液体系,能有效预防水锁损害,达到保护油气层的目的。
[Abstract]:With the increasing demand for oil and gas resources, low porosity and low permeability reservoirs with poor exploration and development have become one of the important measures to increase oil and gas production. In this paper, the reservoir damage mechanism of low porosity and low permeability reservoirs such as Hedimiao and Gaotaizi in Gan'an block is studied. The results of laboratory experiments show that the porosity and permeability of the Hedemiao and Gaotaizi reservoirs in the third member of Qingjiang formation and the fourth member of the Nen formation are very small and belong to the poorly developed low porosity and low permeability reservoirs. The absolute content of clay minerals in the reservoir is less than 5 and no montmorillonite is found. There are moderate partial weak acid sensitivity, water (salt) sensitivity, weak speed sensitivity and weak alkali sensitivity in Heidimiao reservoir, and moderate partial weak velocity sensitivity, weak water sensitivity, weak salt sensitivity, acid sensitivity and alkali sensitivity in Gaotaizi reservoir. The main damage mode is water lock damage. The damage rate of water lock is 10.71% and 15.38%. On the basis of experimental study, a mathematical model describing the invasion damage of filtrate was established, and the numerical calculation was carried out. The recovery value of reservoir permeability obtained by the model is consistent with that obtained by experiment, and the error is not more than 10%. In order to solve the problem of serious damage of water lock in the study area, a waterproof locking agent FHB-10 was selected in the laboratory, the optimum addition was 2, and the drilling fluid system was improved at last. The results of laboratory experiments show that the improved drilling fluid reservoir protection effect is remarkable, permeability recovery value reaches 91.40, it is a kind of low invasion and low damage high quality drilling fluid system, it can effectively prevent water lock damage and achieve the purpose of protecting oil and gas reservoir.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE258

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