摘要
蒸汽驱可明显提高油藏采收率,但孤岛油田稠油粘度过高,受原油界面特性和岩石润湿性的影响,易发生重力超覆和汽窜,单一蒸汽驱并不能达到有效开采的目的。通过室内实验模拟了以聚乙烯吡咯烷酮为驱油剂的驱油剂辅助蒸汽驱过程,研究其对孤岛油田稠油油藏的驱替效果,以及对稠油胶体稳定性、结构组成和稠油沥青质相对分子质量的影响规律。结果表明,蒸汽驱过程中引入适量的驱油剂,可明显提高稠油油藏采收率;增大驱油剂用量,会使稠油提前发生沥青质聚沉,胶体稳定性变差,使得稠油中沥青质相对分子质量变大;随着温度的升高,沥青质提前发生聚沉,稠油胶体稳定性变差,同时稠油中沥青质含量略有提高,胶质与沥青质含量之比变小,沥青质相对分子质量变大。
Steam flooding can enhance the heavy oil recovery obviously. However, a single steam flooding can not achieve good heavyoil development efficiency by the gravity overlap and steam channeling due to the Gudao viscous heavy oil with respect to interfaceproperties of crude oil and rock wettability. Addition of oil displacement agent in the process of steam drive can obviously improve therecovery efficiency. Excessive addition of oil displacement agent can easily cause formation plugging and increase the production diffi-culty. With the PVP as the displacement agent, this paper has studied the variation of colloidal stability, structural composition and re-combinant sub-particles size of Gudao viscous crude oil reacted by chemical auxiliary steam drive. The results show that it can im-prove the recovery factor under the action of PVP auxiliary steam-heavy oil reservoir; when increasing the amount of displacementagent, the oil's starting point of coagulation of asphaltene decreases, colloidal stability becomes worse, and the molecular weight of as-phaltene increases; with the increase of the temperature, the oil's starting point of coagulation of asphaltene decreases, colloidal stabili-ty becomes worse, asphaltene content increases gently, the ratio of resin and asphaltene of oil sample decreases, and the molecularweightof asphaltene increases.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2014年第3期55-57,114-115,共3页
Petroleum Geology and Recovery Efficiency
基金
中国石化科技攻关项目"普通稠油水驱后转蒸汽驱提高采收率技术研究"(P07071)
关键词
稠油
驱油剂
蒸汽驱
胶体稳定性
孤岛油田
heavy oil
displacement agent
steamflooding
colloidal stability
Gudaooilfield
