高温高压气藏高矿化度地层水结盐实验研究  

Experiment Research on High Salinity Formation Water Salting-out in High Temperature and High Pressure Gas Reservoirs

作　　者：王彬[1] 唐弘程 曹臻[1] 鄢雨[3] 

机构地区：[1]中石化西南油气分公司川东北采气厂,四川阆中637400 [2]中海油能源发展股份有限公司工程技术深圳分公司,广东深圳518067 [3]中国石油新疆油田分公司准东采油厂,新疆阜康831511

出　　处：《重庆科技学院学报（自然科学版）》2016年第6期13-16,共4页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家自然科学基金项目"高温高压CO2-原油-地层水三相相平衡溶解度规律"(51404037)

摘　　要：针对高矿化度地层水的影响,开展高矿化度地层水结盐实验研究。研究结果表明,当压力下降到30 MPa时,开始出现结盐现象,颗粒漂浮于地层水中;当压力下降到10 MPa时,大量颗粒附着在观察窗表面,说明结盐在低压条件下才能发生。在地层水-天然气体系中,结盐后Cl^-和Na^+含量的变化较大,Ca^(2+)、SO2-4及HCO-3等离子含量小幅降低。地层水经过岩心后密度降低10%,岩心上有明显的白色晶体,电镜扫描图上有明显的结晶颗粒,结晶盐以NaCl为主,伴有其他盐晶体。结盐造成孔隙度和渗透率损伤。原始渗透率越低,损伤越大,说明结盐对低渗透或特低渗透气藏的影响不可忽略。This paper carries out a series of high salinity formation water salting - out experiments, to study the effect caused by high salinity formation water. Experimental results show that when the system pressure drops to 30 MPa, the salt particles float in the formation water; when the system pressure drops to 10 MPa, large number of particles adhere to the surface of the observation window, indicating that salting - out occurs at low pressure. For formation water - gas system, C1- and Na - have greatly decreased after salting - out ; however Ca2 - , SO2- and HCO3- decrease lightly. After water flows through the core, the density reduces by 10%. Some white crystals lay on the core, and SEM picture can show crystal grains, grainy or lumpy based on NaC1. Porosity and permeability are both damaged. The lower the original permeability is, the greater the damage will be. The impact of salting - out in low permeability or ultra -low permeability reservoirs can＇t be ignored.

关 键 词：气藏 高矿化度地层水 结盐实验 驱替实验 

分 类 号：TE311[石油与天然气工程—油气田开发工程]