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优选黏土稳定剂的室内实验研究

ISSN号：1671-1815
期刊名称：《科学技术与工程》
时间：0
分类：TE357.46[石油与天然气工程—油气田开发工程]
作者机构：[1]东北石油大学教育部提高油气采收率重点实验室,黑龙江大庆163318, [2]大庆油田有限责任公司第一采油厂,黑龙江大庆163414
相关基金：国家自然科学基金重点项目“低渗透油层提高驱油效率的机理研究”（编号：50634020）; 黑龙江省杰出青年基金项目“油层多孔介质内纳观渗流界面作用力研究”联合资助

关键词：低渗透, 黏土稳定剂, 天然岩心, 膨胀率, 伤害率, low permeability, clay inhibitor, natural core, swelling rate, damage rate

中文摘要：

选取大庆油田某A组储层的天然岩心,气测渗透率分别为0.274μm2、0.442μm2和0.766μm2,针对中低渗透储层黏土含量较高的实际情况,为优选适用于该储层注水开发的黏土稳定剂,进行了液体（聚季铵盐黏土稳定剂DNT-014）、固体（QY-138）和复配盐黏稳剂（A储层强水敏型配伍液）3种黏土稳定剂的膨胀率测定实验、岩心伤害率实验和对比驱替实验。结果表明：A组储层3种不同渗透率的天然岩心,分别加入液体、固体和复配盐3种黏稳剂后,其膨胀率在1.13%～1.22%,但只有液体黏稳剂DNT-014的加入,3种岩心均不产生颗粒。黏稳剂DNT-014和QY-138的加入,对岩心渗透率伤害较小,最高伤害率分别为13.4%和19.17%;加入复配盐黏稳剂后,对岩心渗透率伤害最大,最高伤害率达32.48%。DNT-014的加入,对储层黏土矿物的膨胀和运移起到防控作用,与储层配伍性最好,对渗透率伤害最小,且达到一定注入倍数后,伤害率不再增长。针对A组储层,注水开发中应优选液体黏稳剂DNT-014。

英文摘要：

Natural cores in the reservoir of group A in Daqing oilfield are selected with the permeability by gas survey of 0.274,0.442 and 0.766μm2 respectively.Aiming at the actual situation of higher clay content in medium to low permeability reservoirs,swelling rate measurement experiments,core damage rate experiments and displacement contrast experiments of three clay inhibitors are made for optimizing the clay inhibitor suitable for water flooding in this type of reservoir.The three clay inhibitors are liquid（polyquaternary amine salt DNT-014）,solid（QY-138） and compound salt（compatibility fluid with strong water sensitivity in reservoir A） clay inhibitor.The results show that the swelling rate is from 1.13% to 1.22% when those three clay inhibitors were injected to the three-permeability cores,but no particle formed only when DNT-014 was injected.The injection of DNT-014 and QY-138 brings relatively less damage,with 13.4% and 19.17% of the maximum damage rate respectively.The injection of the compound salt clay inhibitor brings maximum damage,up to 32.48%.The injection of DNT-104 will prevent swell and migration of the clay mineral in the reservoirs,which has good compatibility with the reservoir and minimal damage on permeability.The damage rate has no more increment at certain pore volume injected.So liquid clay inhibitor DNT-014 is the best one for water flooding in reservoir A.

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