Compositions and methods for increasing recovery, or flowback, of hydrocarbon compounds from hydrocarbon-containing subterranean reservoirs. The compositions include a dialkyl dimethyl ammonium surfactant, an amphoteric surfactant, and a solvent. The concentrated compositions are storage stable and easily diluted with a water source such as produced water to form injectates suitable for injecting into one or more hydrocarbon-bearing subterranean reservoirs. The injectates convert oil-wet rocks to water-wet but do not cause formation of emulsions with hydrocarbon compounds within the subterranean environment. Injection of the injectates into a reservoir results in an increase in the yield of hydrocarbons recovered, in particular from low permeability, low porosity reservoirs such as those formed by or encountered in hydraulic fracturing and/or in certain geographic locations.
从含碳氢化合物的地下储层中提高碳氢化合物回收率或回流率的组合物和方法。组合物包括一种二烷基二甲基
铵表面活性剂、一种两性表面活性剂和一种溶剂。浓缩组合物储存稳定,容易与
水源(如采出
水)稀释,形成适合注入一个或多个含碳氢化合物地下储层的注入剂。注入剂可将油湿岩石转化为
水湿岩石,但不会与地下环境中的碳氢化合物形成乳状液。将注入剂注入储油层可提高碳氢化合物的采收率,特别是从低渗透率、低孔隙率储油层,如
水力压裂形成或遇到的储油层和/或某些地理位置的储油层。