摘要
为了更好地了解疏松砂岩油藏水驱开发特点,为提高水驱采收率提供依据,利用铸体薄片、压汞、扫描电镜、油水相渗、水驱油等测试手段,深入研究了渤海海域P油田馆陶组储层油水相对渗透率和水驱油效率,分析了疏松砂岩油藏水驱开发动态特征。结果表明:研究区储层岩石成分以碎屑长石砂岩与长石岩屑砂岩为主,分选差、磨圆度低;孔隙类型为原生粒间孔、溶蚀粒间孔;喉道类型以片状、缩颈状为主;原油黏度对油水相对渗透率和水驱油效率存在影响,原油黏度愈高,油水相相对渗透率愈低,水驱油效果愈差;研究区储层黏土矿物含量较高,喉道以缩颈状为主,亲水黏土矿物容易发生膨胀堵塞喉道,在较大的生产压差下易产生速敏,适当控制压差,提前注入防膨试剂对注水具有明显效果。
To better understand the development characteristics of waterflooding in unsolidated sandstone reservoirs,and to provide the basis for improving waterflooding recovery,the oil-water relative permeability and waterflooding efficiency of Guantao Formation in P Oilfield in Bohai Sea was further studied by means of casting slice,mercury injection,scanning electron microscopy,oil-water phase permeability and water displacing oil,and so on.And then it was analyzed the dynamic characteristics of waterflooding development.The results show that the composition of reservoir rocks in the study area is mainly clastic feldspar sandstone and feldspar detrital sandstone,with poor separation and low roundness.The pore types are primary intergranular pores and dissolved intergranular pores,and the throat types are mainly flaky and neck-like.The viscosity of crude oil has an effect on the oil-water relative permeability and the waterflooding efficiency,and the higher the crude oil viscosity,the lower the oil-water relative permeability,the worse the waterflooding efficiency.The clay mineral content of the reservoir is relatively higher,the throat types are mainly neck-like,and the hydrophilic clay minerals are prone to expand and block the throats.Under large production pressure difference,it is easy to produce speed sensitivity.When the anti-swelling reagent is injected in advance,it has obvious effect.
作者
李冰
周妍
许万坤
姜立富
李媛婷
LI Bing;ZHOU Yan;XU Wankun;JIANG Lifu;LI Yuanting(Tianjin Branch of CNOOC(China)Co.,Ltd.,Tianjin 300459,China;CNPC Logging Company,Xi’an 710077,China)
出处
《复杂油气藏》
2020年第2期47-50,55,共5页
Complex Hydrocarbon Reservoirs
基金
国家科技重大专项“渤海油田高效开发示范工程(编号:2016ZX05058)”。
关键词
渤海油田
相对渗透率
水驱油效率
影响因素
BohaiOilfield
relative permeability
water flooding efficiency
controlling factors
