克拉玛依油田B21井区油藏表面活性剂性能评价

Evaluation of Surfactant Performance in Reservoirs of Wellblock B21, Karamay Oilfield

为了评价克拉玛依油田B21井区二类砾岩油藏驱油用HW表面活性剂的可行性,评价了表面活性剂界面活性、稳定性、乳化性能和模拟驱油性能。结果表明:HW表面活性剂质量分数为0.1%~0.5%时,界面张力在10-2m N/m量级,最小界面张力为0.006 0 m N/m,该表面活性剂具有良好的稳定性,长期放置界面张力不发生明显变化,有利于通过降低界面张力提高原油采收率;表面活性剂的质量分数和水油比均对其乳化性能有显著影响,乳化能力随质量分数增加而增大,破乳后析出水较为清澈且界面清晰,有利于表面活性剂驱油后的油水分离。驱油实验结果显示,质量分数为0.3%的HW表面活性剂溶液可提高采收率10.5%.

To evaluate the feasibility of oil displacement using HW surfactant in TypeⅡconglomerate reservoirs in Wellblock B21,Kara-may oilfield,the paper investigates the interfacial activity,stability,emulsifying property and simulated oil displacement performance of the surfactant.The results show that the magnitude of interfacial tension of HW surfactant concentration is 10-2 mN/m and the minimum interfa-cial is 0.006 0 mN/m when the mass fraction of HW surfactant is in the range of 0.1%~0.5%;the surfactant has good stability and its inter-facial tension will not change during a long-term placement,which is in favor of enhancing oil recovery through reducing interfacial tension;the mass fraction and water-oil ratio of the surfactant have significant impact on emulsifying ability which increases with the increase of mass fraction,the water after demulsification is clear with distinct interface,which can help oil-water separation after oil displacement.The oil displacement experiment result shows that the surfactant solution with the mass fraction of 0.3%can improve the recovery factor by 10.5%.