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An Alkaline/Surfactant System for Injection Well Stimulation in Low Permeability and High Temperature Oil Reservoirs
Author(s): 
Pages: 419-421,449
Year: Issue:  4
Journal: OILFIELD CHEMISTRY

Keyword:  low permeability oil reservoirshigh temperaturealkaline/surfactant systemwater injection well stimulationinjectivity enhancingenhanced oil recovery(EOR)quarternary ammonium salt;
Abstract: 针对低渗高温的留西油藏,研究了碳酸钠/季铵盐表面活性剂二元体系的降压增注及驱油性能.所用季铵盐为工业品,二元体系用矿化度627 mg/L的注入水配制,碳酸钠浓度为2 g/L.季铵盐浓度为1.5 g/L的二元体系与路44断块高凝高黏原油间的界面张力(75℃)在10-1~10-2 mN/m范围,该体系在120℃热老化13天后界面张力稳定在10-2mN/m;该体系在路44断块岩心片上的接触角为10.2°(注入水为56.7°);含黏土9%的岩心粉在该体系中的膨胀率降低17.24%.在80℃下,注水引起气测渗透率1.26×10-3~4.64×10-3μm2的油饱和天然岩心注入压力大幅升高,连续注入季铵盐浓度0.5~2.0 g/L的二元体系时,注入压力下降并趋于平稳,当季铵盐浓度为1.5g/L时压降率最大(38.78%),采收率增幅也最大(9.84%);在水驱之后注入1.5 g/L季铵盐的二元体系,压降率和采收率增幅均随注入量增大(0.5~2.0 PV)而增大,注入量1.0 PV时压降率较高(27.32%)而采收率增幅为20.51%,十分接近最高值.
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