不同类型表面活性剂对致密油层自吸水能力影响实验

为了进一步研究不同离子类型的表面活性剂配方对低渗油层自吸水影响机理以及优选配方,以低渗储层枣湾区长6油层为研究对象,以无因次时间、邦德指数、自吸驱油效率、流度、Amott法评价的润湿性等为评价指标,通过自吸实验研究了表面活性剂的配方类型对油层自吸水驱油的影响。结果表明:实验岩心自吸类型主要为逆向渗吸,表面活性剂溶液改善了岩心的润湿性使得岩心更加亲水,表活剂溶液自吸采油速度和自吸驱油效率明显大于地层水自吸的岩心。非-阴离子型的配方相比较其他配方自吸效果最好,并且显著改善了岩心的渗流能力。

EXPERIMENT ON THE INFLUENCES OF DIFFERENT TYPES OF THE SURFACTANTS ON THE IMBIBITION CAPACITY OF TIGHT OIL LAYERS

In order to further study the influencing mechanism of the surfactant formulations with different types of the ion on the imbibition water for the low-permeability oil reservoirs and moreover the preferred formula,taking Chang 6 oil reservoir in the low-permeability reservoir of Zaowan Block as the object of the study,and furthermore regarding the dimensionless time,Bond Index,imbibition oil-flooded efficiency,mobility and wettability evaluated by Amott method as the evaluating indexes,with the help of the imbibition experiment,the influences of the surfactant formula types on the water imbibition oil flooding were researched.The achievements show that the imbibition type of the testing core is the reverse flowing,and the surfactant solution changes the wettability of the core so that the core is more hydrophilic,the imbibition rate and imbibition efficiency of the surfactant solution are obviously higher than those of the core with the formation water.Non-anionic surfactants have the best imbibition effects than the others,and furthermore they can significantly improve the seepage capability of the core.