CAJ | 학술논문

为更好地揭示无碱二元体系在油藏中性能损失规律,结合胜利孤东七区非均质强、储层结构疏松等油藏条件,在不同长度岩心中开展二元体系溶液渗流实验.通过进行聚合物溶液对表面活性剂界面活性以及表面活性剂对聚合物溶液黏度的影响来研究两者间的相互作用;并在不同长度岩心出口端取采出液,测试不同位置处黏度与界面张力的变化研究该二元体系溶液在近井和油藏流变性和界面活性分布特征.结果表明:加入聚合物溶液后,二元体系界面张力变化规律与单一表面活性剂相似,但使油/水界面张力达到超低时间要长;表面活性剂对聚合物溶液黏度影响不大,二元体系能保持良好的增黏特性;渗流开始时,二元体系 A 和 B 黏度保留率较单一聚合物溶液要高,而界面活性主要损失在近井地带(相对距离0~20%),并在相对距离60%~100%处达到稳定;渗流达到稳定时,二元体系黏度保留率在0~20%处从100%降为84.2%,并在油藏深部分布均匀,受到相对距离的影响不大,二元体系与油滴间的界面张力在60%时达到稳定.
위경호지게시무감이원체계재유장중성능손실규률,결합성리고동칠구비균질강、저층결구소송등유장조건,재불동장도암심중개전이원체계용액삼류실험.통과진행취합물용액대표면활성제계면활성이급표면활성제대취합물용액점도적영향래연구량자간적상호작용;병재불동장도암심출구단취채출액,측시불동위치처점도여계면장력적변화연구해이원체계용액재근정화유장류변성화계면활성분포특정.결과표명:가입취합물용액후,이원체계계면장력변화규률여단일표면활성제상사,단사유/수계면장력체도초저시간요장;표면활성제대취합물용액점도영향불대,이원체계능보지량호적증점특성;삼류개시시,이원체계 A 화 B 점도보류솔교단일취합물용액요고,이계면활성주요손실재근정지대(상대거리0~20%),병재상대거리60%~100%처체도은정;삼류체도은정시,이원체계점도보류솔재0~20%처종100%강위84.2%,병재유장심부분포균균,수도상대거리적영향불대,이원체계여유적간적계면장력재60%시체도은정.
In order to reveal the property loss law of surfactant-polymer (SP) system in the reservoir, combining with the reser-voir conditions of strong heterogeneity and unconsolidated reservoir structure in the seventh block of Gudong oilfield, flow experiments were carried out in the cores with different lengths. The interaction between surfactant and polymer was studied through the change of interfacial activity and viscosity after the polymer and surfactant were added into SP system. The produced fluid was taken out from outlet end of cores with different lengths, and interfacial activity and viscosity were measured to study distribution characteristics of rhe-ology and interfacial activity of surfactant-polymer system in vicinity of wellbore and reservoir. The experimental results showed that, after adding polymer solution, SP system interfacial tension presented similar change law to that of single surfactant, but the time to reach ultra-low interfacial tension was longer. The surfactant had little effect on viscosity of polymer solution, and surfactant-polymer system could maintain a good property of viscosity-increasing. At the beginning of flowing, the viscosity retention rate of SP system A and B were larger than the value of single polymer solution. But most of interfacial activity of SP system lost in vicinity of wellbore 0~20%, the interfacial tension was stable in the relative distance of 60%~100%. After the flowing became stable, the viscosity retention rate of SP system reduced from 100% to 84.2% in the relative distance of 0~20%, the distribution was uniform at deep reservoir, and the relative distance influence was comparative less. Interfacial activity between SP system and oil drop was stable in the relative distance of 60%.