Mechanisms of Enhanced Oil Recovery by Surfactant-Induced Wettability Alteration

被引:32
作者
Hou, Baofeng [1 ]
Wang, Yefei [1 ]
Cao, Xulong [2 ]
Zhang, Jun [3 ]
Song, Xinwang [2 ]
Ding, Mingchen [1 ]
Chen, Wuhua [1 ]
机构
[1] China Univ Petr East China, Sch Petr Engn, 66 West Changjiang Rd, Qingdao 266580, Peoples R China
[2] SINOPEC, Shengli Oilfield Co, Geosci Res Inst, Dongying, Peoples R China
[3] China Univ Petr East China, Sch Sci, 66 West Changjiang Rd, Qingdao 266580, Peoples R China
关键词
Adhesion work; capillary force; EOR mechanisms; relative permeability; seepage laws; surfactants; wettability alteration; MICROSCOPIC DISPLACEMENT MECHANISMS; SPONTANEOUS IMBIBITION; RESERVOIR WETTABILITY; WATER; WET; MODEL;
D O I
10.1080/01932691.2015.1089778
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Different measurements were conducted to study the mechanisms of enhanced oil recovery (EOR) by surfactant-induced wettability alteration. The adhesion work could be reduced by the surfactant-induced wettability alteration from oil-wet conditions to water-wet conditions. Surfactant-induced wettability alteration has a great effect on the relative permeabilities of oil and water. The relative permeability of the oil phase increases with the increase of the water-wetness of the solid surface. Seepage laws of oil and water are greatly affected by surfactant-induced wettability alteration. Water flows forward along the pore wall in the water-wet rocks and moves forward along the center of the pores in the oil-wet rocks during the surfactant flooding. For the intermediate-wet system, water uniformly moves forward and the contact angle between the oil-water interface and the pore surface is close to 90 degrees. The direction of capillary force is consistent with the direction of water flooding for the water-wet surface. While for the oil-wet surface, the capillary force direction is opposite to the water-flooding direction. The highest oil recovery by water flooding is obtained at close to neutral wetting conditions and the minimal oil recovery occurs under oil-wet conditions.
引用
收藏
页码:1259 / 1267
页数:9
相关论文
共 28 条