摘要
针对叙利亚O油田低渗透碳酸盐岩稠油油藏热采过程中存在的"注不进、难采出"的技术难题,利用O油田岩心分别开展自吸实验和驱替实验,研究50和150℃下地层水、薄膜扩展剂溶液的渗吸规律及其驱替效果。自吸实验结果表明:原始条件下(地层水渗吸),O油田碳酸盐岩岩心呈明显的亲油或弱亲油的润湿特征;而薄膜扩展剂溶液渗吸后,岩石润湿性向亲水或弱亲水转变,实现了润湿反转。驱替实验结果表明:对比150℃下注蒸汽,伴蒸汽注入耐高温薄膜扩展剂可明显降低注汽压力,约为2 MPa;驱替效率提高约10%。岩石润湿性反转后,毛管压力变为水驱油的动力,水易渗吸入岩石孔隙内,从而解决"注不进"的难题;而高温降低原油粘度可提高原油渗流能力,从而解决"难采出"的技术难题。因此,伴蒸汽注耐高温薄膜扩展剂的热复合化学方法是针对叙利亚O油田及类似低渗透碳酸盐岩稠油油藏提高采收率的有效方法。
In order to solve the problem of“difficult to inject,difficult to produce”under the condition of thermal recoveryin low permeability carbonate heavy oil reservoir of Syria O oilfield,experiments of self-imbibition and oil displacementwere conducted for the cores in O oilfield. Imbibitions rule and displacement effect of formation water and thin film spreading agent（TFSA）solution were researched under 50 and 150 ℃. The self-imbibition experiment result shows that the wettability of the carbonate cores in O oilfield turns from obvious oil-wet or weak oil-wet under original conditions to waterwetor weak water-wet after TFSA imbibition,and thus wettability inversion is realized. The displacement experiment result shows that compared with steam injection at 150 ℃,the thermal compound chemical technology,steam injection withTFSA,can significantly reduce steam injection pressure by about 2 MPa and the displacement efficiency is increased byabout 10%. After wettability inversion of the rocks,water is easy to enter the pore of the rocks under capillary force whichis a driving force during water displacing oil and the difficulty of“difficult to inject”may be solved. High temperature canreduce crude oil viscosity and the percolation ability of crude oil is improved,and the difficulty of“difficult to produce”may be solved. Therefore,the thermal compound chemical technology is a feasible method for enhancing oil recovery in Ooilfield and similar low permeability carbonate heavy oil reservoirs.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2016年第3期101-105,共5页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"裂缝-孔隙型碳酸盐岩稠油油藏开发关键技术"(2011ZX05031-002)
关键词
低渗透
碳酸盐岩
稠油
润湿性
薄膜扩展剂热复合化学方法
low permeability
carbonate rock
heavy oil
wettability
thin film spreading agent
thermal compound chemicaltechnology
