影响塔河油田酸化油破乳的因素分析

酸化油破乳一直是困扰油田的技术难题，采用光散射法及静电场法研究了塔河油田的2种酸化油破乳情况，然后从残余药剂、固体颗粒、胶质与沥青质3方面分析了影响酸化油破乳的主要原因。结果表明：压裂液中的瓜胶及酸化液中的盐酸不利于破乳；固体颗粒主要为亲油型硫铁类化合物，促进W/O采出液的稳定；酸化油中沥青质聚集体的溶解性更差，易于形成稳定的沥青质膜。上述3种因素的协同作用导致酸化油破乳难度加大。

FACTORS AFFECTING DEMULSION OF EMULSIFIED CRUDE OIL OF ACIDIZING WELLS IN TAHE OILFIELD

Demulsification of emulsified crude oil of acidizing wells is always a technical difficult problem in Tahe oilfield. This work investigated the demulsification of two kinds of Tahe emulsified crude oils by light scattering method and electrostatic field method, respectively, and then analyzed the main factors affecting the demulsification of emulsified oil from three aspects of residual chemicals, solid particles, resins and asphaltenes. The results show that the guar gum in fracturing fluid and the hydrochloric acid in acidizing fluid are harmful to demulsification; the existing solid particle composed of lipophilic compounds of iron and sulfur promotes the stabilization of W/O fluids; the asphaltene aggregate having worse solubility in acid oil is easy to form a stable asphaltene film. The synergistic effect of these three factors together increases the difficulty on demulsification of Tahe emulsified oils.