摘要
不同压裂液体系对大庆外围致密油储层孔隙喉道具有不同的敏感性。基于X射线衍射、薄片鉴定等技术对区块储层的宏观和微观孔隙结构特征进行表征,分析了储层潜在敏感伤害特性,通过岩心驱替伤害试验,进一步评价了表面活性剂、高分子聚合物、胍胶3种压裂液基液与破胶液对储层岩心的伤害,并使用岩石润湿性测定、CT断层扫描和电镜扫描等方法,厘清了不同压裂液对2个区块致密油储层孔隙喉道微观伤害机理。结果表明,大庆外围致密油储层黏土含量高,易引起水敏、速敏;陆源碎屑中岩屑含量比较高,长石含量少,胶结物以方解石或方解石+黏土为主,储层孔隙结构性质差。3种基液对致密油储层均存在伤害,伤害程度依次增加,3种压裂液的破胶液对2个区块的孔隙和孔喉伤害率分别为45.11%和16.02%、34.57%和7.45%、13.06%和6.49%。实验结果为优化大庆外围致密油区块压裂液体系配方提供依据,可降低压裂液对致密油储层的伤害,提高大庆油田致密油藏的有效动用。
Different fracturing fluids have different sensitivity to pore throats in tight reservoirs outside Daqing.Based on X-ray diffraction, thin section identification and other technologies, the macroscopic and microscopic pore structure characteristics of the block reservoir are characterized, and the potential sensitive damage characteristics of the reservoir are analyzed.Through the core displacement damage test, the damage to the reservoir core caused by the base fluid and gel breaking fluid of three fracturing fluids(surfactant, high polymer and guanidine gum) is further evaluated.The micro damage mechanism of different fracturing fluids to pore throats of tight oil reservoirs in two blocks was clarified by using rock wettability measurement, CT scanning and electron microscope scanning.The results show that the high clay content of compact oil reservoirs in the periphery of Daqing is liable to cause water sensitivity and velocity sensitivity, the detritus content of terrigenous detritus is relatively high, the feldspar content is low, the cementation is mainly calcite or calcite + clay, and the pore structure of the reservoirs is poor.The damage degree of the three base fluids to the tight oil reservoir is reduced in turn.The damage rates of the three fracturing fluids to the pores and throats of the two blocks are 45.11% and 16.02%,34.57% and 7.45%,13.06% and 6.49% respectively.The experimental results provide a basis for optimizing the formula of fracturing fluid system in compact oil blocks outside Daqing, which can reduce the damage of fracturing fluid to compact oil reservoirs and improve the effective production of compact oil reservoirs.
作者
高翔
马鑫尧
李存荣
蒋成刚
GAO Xiang;MA Xinyao;LI Cunrong;JIANG Chenggang(Oil Production Engineering Research Institute of Daqing Oilfield Co.,Ltd.,PetroChina,Daqing,Heilongjiang 163453,China;Heilongjiang Provincial Key Laboratory of Oil and Gas Reservoir Stimulation,Daqing,Heilongjiang 163453,China;Qingdao East China Institute of Safety and Environmental Protection Co.,Ltd.PetroChina,Qingdao,Shandong 266071,China)
出处
《石油地质与工程》
CAS
2023年第1期86-90,共5页
Petroleum Geology and Engineering
基金
国家科技重大专项“低渗-致密油藏高效提高采收率新技术”(2017ZX05009)
国家重大科技专项“松辽盆地致密油开发示范工程”(2017ZX05071)。
关键词
大庆油田
致密油
压裂
胍胶压裂液
岩心驱替实验
Daqing Oilfield
tight oil
fracturing
guar gum fracturing fluid
core displacement experiment
