摘要
针对高凝油注水开发效果差的问题,为了明确一种能与原油形成原位微乳液的高效表面活性剂IMS驱替高凝油的适应性,开展了表面活性剂-高凝油相互作用和单一表面活性剂、二元复合驱体系及泡沫驱油实验。研究结果表明,质量分数为0.1%的表面活性剂IMS可将界面张力降至0.6×10^(-3)mN/m,所形成的微乳液优先增溶高凝油中的轻质组分,难以显著改变高凝油的析蜡点和凝固点。质量分数为0.1%~2.0%、用量为0.25~0.5 PV的表面活性剂IMS吞吐或驱替,原油采收率增幅在1.7%~12.3%,进一步焖井浸泡不能明显改善驱油效果。聚合物或泡沫的引入能够增强表面活性剂驱油能力,对应二元复合驱体系(1.0%表面活性剂+0.2%聚合物,0.5 PV)采收率增幅为18.4%,不同浓度表面活性剂泡沫驱(1.0%和0.3%,气液比2∶1,起泡液0.5 PV)采收率增幅分别为17.3%和16.8%。但是二元复合驱的注入压力高,在低渗高凝油藏中存在堵塞风险,而泡沫体系驱的注入压力相对低,是提高采收率的较好方法。
In view of the poor development of high-pour-point oil by cold water injection,a high-efficiency surfactant that can form microemulsion with crude oil was used,and the adaptability of the surfactant for enhancing high-pour-point oil recovery was determined through analyzing the surfactant-oil interaction and high-pour-point oil displacements effect by single surfactant,the corresponding combination and foam systems.The results showed that the surfactant IMS with mass fraction of 0.1%could effectively reduce the oil-water interfacial tension to 0.6×10^(-3)mN/m.The obtained microemulsion could dissolve preferentially the light component of oil,which could not significantly reduce the wax-evolution point and freezing point of the high-pour-point oil.The oil recovery by surfactant huff-n-puff and displacing injection with concentrations of 0.1%—2.0%and utilizations of 0.25—0.5PV was 1.7%—12.3%,and additional soaking operation could not further improve such oil recovery.The presence of polymer or foam in surfactant solutions could obviously enhance the oil displacement,and the oil recovery by the corresponding binary combination flooding system of 1.0%surfactant+0.2%polymer with the injection volume of 0.5 PV was 18.4%,while those of the surfactant foams with different surfactant concentrations of 1.0%and 0.3%when gas liquid ratio was 2∶1 and the surfactant solution volume was 0.5 PV,were 17.3%and 16.8%,respectively.However,the binary combination flooding behaved a high injection pressure and had underlying injection problem in the low permeability reservoirs,while the foam system performed a relatively low injection pressure and could enhance oil recovery effectively.
作者
李强
丁名臣
张星
吴寒超
陈利霞
王业飞
LI Qiang;DING Mingchen;ZHANG Xing;WU Hanchao;CHEN Lixia;WANG Yefei(College of Petroleum Engineering,China University of Petroleum,Qingdao,Shandong 266580,P R of China;Research Institute of Petroleum Engineering Technology,Shengli Oilfield Company,Dongying,Shandong 257000,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2022年第3期474-479,共6页
Oilfield Chemistry
基金
中国石化重点科技攻关项目“低渗油藏化学剂的开发及应用”(项目编号210427)
山东省自然科学基金项目“基于可控释放型自生泡沫的低渗油藏增能-调驱一体化提高采收率方法”(项目编号ZR201911080151)。
关键词
低渗透率
高凝油
原位微乳液
表面活性剂
提高采收率
low permeability
high-pour-point oil
in-situ microemulsion
surfactant
enhanced oil recovery
