公开(公告)号：US3994342A

公开(公告)日：1976-11-30

申请号：US592980

申请日：1975-07-03

申请人： Robert N. Healy ,  Walter W. Gale

发明人： Robert N. Healy ,  Walter W. Gale

IPC分类号： C09K8/584 ,  E21B43/20 ,  E21B43/22

CPC分类号： C09K8/584

摘要： Crude oil remaining in a subterranean formation is recovered through the injection of a microemulsion comprising an oil, i.e. a refined or crude oil, an aqueous medium and as a surfactant, a C.sub.8-16 orthoxylene sulfonate. The aqueous medium is preferably a brine having a salt concentration of up to about 2 1/2% by weight, although increased brine tolerance can be achieved by inclusion of a cosurfactant within the microemulsion. When utilized in the secondary or tertiary recovery of crude oil, the microemulsion is preferably followed by thickened water and thereafter unthickened water injected into and through the subterranean formation.

摘要翻译： 残留在地层中的原油通过注入包含油，即精制或原油，水性介质和表面活性剂C8-16邻二甲苯磺酸盐的微乳液而回收。 水性介质优选为盐浓度高达约2 1/2重量％的盐水，尽管通过在微乳液中包含辅助表面活性剂可以实现增加的盐水耐受性。 当用于原油的二次或三次回收时，微乳液优选地随后加入增稠的水，然后将未渗透的水注入并通过地下地层。

公开(公告)号：US3981361A

公开(公告)日：1976-09-21

申请号：US601126

申请日：1975-07-31

申请人： Robert N. Healy

发明人： Robert N. Healy

IPC分类号： C09K8/584 ,  E21B43/22

CPC分类号： C09K8/584 ,  Y10S507/938

摘要： Disclosed herein is a method for recovering oil from subterranean formations using microemulsions. The microemulsion is compounded from an oil, an aqueous medium, and a surfactant, and its parameters are varied to form volumetric ratios of oil to surfactant in the microemulsion and/or water to surfactant in the microemulsion greater than 0.5. Preferably, the volumetric ratios will be greater than 2.0. Among the parameters which can be adjusted to change these volumetric ratios include the salinity of the aqueous medium, the temperature of the microemulsion system, the chemical structure of the surfactant, the chemical structure of any cosurfactant included in the microemulsion, the degree of aromaticity of the oil, and composition of dissolved solids in the aqueous medium. In one preferred embodiment of the invention an oil is chosen which has physical and chemical characteristics substantially the same as the formation oil. The aqueous medium has physical and chemical characteristics substantially the same as the formation water. A surfactant which has a chemical structure which will form a microemulsion having volumetric ratios of oil to surfactant and/or of water to surfactant greater than 0.5 is selected for inclusion in the microemulsion system. The oil; aqueous medium; and surfactant, determined in accordance with the teachings of this invention, form a class of microemulsions which is effective in recovering oil from subterranean formations of interest. All microemulsions within the class will be effective for recovering oil from the formation. Oil is recovered by compounding a microemulsion within the class and injecting this microemulsion into the formation.

摘要翻译： 本文公开了一种使用微乳液从地层中回收油的方法。 该微乳液由油，水性介质和表面活性剂混合，并且其参数被改变以在微乳液和/或微乳液中的表面活性剂中的油与表面活性剂的体积比大于0.5。 优选地，体积比将大于2.0。 可以调节以改变这些体积比的参数包括水介质的盐度，微乳液体系的温度，表面活性剂的化学结构，微乳液中包含的任何辅助表面活性剂的化学结构，芳香度的程度 油和在水性介质中的溶解固体的组成。 在本发明的一个优选实施方案中，选择具有与地层油基本上相同的物理和化学特性的油。 水介质具有与地层水基本相同的物理和化学特性。 具有化学结构的表面活性剂被选择用于包含在微乳液体系中，所述表面活性剂将形成具有油与表面活性剂和/或水与表面活性剂的体积比大于0.5的微乳液。 油; 水介质; 和根据本发明的教导测定的表面活性剂形成一类微乳液，其有效地从感兴趣的地下地层中回收油。 课堂内的所有微乳液将有效地从地层中回收油。 通过将类中的微乳液混合并将该微乳液注入地层来回收油。