摘要
为进一步探究高温低渗油藏中表面活性剂溶液渗吸机理,以高温低渗的头台油田扶余油层为例,以渗吸过程中黏附功降低因子以及毛管力与重力比值N-1B为评价指标,通过实验研究了表面活性剂溶液组成、裂缝发育程度和岩石渗透率对渗吸效果的影响。结果表明:表面活性剂可有效改善岩心渗吸效果,但选择表面活性剂时,应在改变界面张力降低黏附功、提高洗油效率的同时兼顾界面张力对毛管力的影响,不应一味追求过低油水界面张力。类似扶余的低渗透裂缝性储层,随裂缝系统发育程度增加,毛管力与重力比值N-1B增大,基质岩石与裂缝系统之间的交渗速度加快,达到平衡时间缩短,渗吸采收率增加。实验岩心渗透率范围内,随岩心渗透率增加,油水交渗速度加快,渗吸达到平衡时间缩短,渗吸采收率增加。
In order to further discuss the imbibition mechanism of surfactant solution in high temperature and low permeability reservoir,the effects of surfactant solution composition,fracture development degree and core permeability on the adhesion work reducing factor and the capillary force to gravity ratio NB- 1 of surfactant solution in imbibition process are studied by experiments taking Fuyu high temperature and low permeability reservoir in Toutai Oilfield as an example. The results show that,surfactant can effectively improve the core imbibition effect,but when selecting surfactant,not only should the influence of interfacial tension on the adhesion work reduction and oil displacement efficiency improvement but also its effect on capillary force be considered. Should not blindly pursue low oil-water interfacial tension. As to low permeability fractured reservoir with similar characteristics to Fuyu reservoir,with the increase of fracture development degree,the capillary force to gravity ratio NB- 1 increases,the imbibition velocity between rock matrix and fracture system increases,the imbibition balance time is shortened and the imbibition recovery factor is increased. In the permeability range of experimental cores,with the increase of core permeability,the imbibition velocity between rock matrix and fracture system increases,the imbibition balance time is shortened and the imbibition recovery factor is increased.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2015年第5期80-84,10-11,共5页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
大庆头台油田开发有限责任公司重大科技攻关课题"扶余油层二元吞吐渗吸采油室内评价"
关键词
高温低渗油藏
渗吸采收率
表面活性剂溶液
黏附功降低因子
毛管力与重力比值
high temperature low permeability reservoir
imbibition recovery factor
surfactant solution
adhesion work reducing factor
ratio of capillary force to gravity
