摘要
针对高温高盐的中原油田，考察了石油磺酸盐MJ2和DQ分别与M=2．4×10^7的HPAM Y2、疏水基含量0.25％的疏水缔合聚合物AP—P5组成的4个表聚二元体系98℃下的界面张力、表观黏度、耐盐性和热稳定性。配液用水为矿化度122．4g／L、含钙镁的胡12块产出水，在考察耐盐性时使用NaCl盐水，基础实验体系含石油磺酸盐3．0g／L，含聚合物1．5g／L。含MJ2的表聚二元体系与胡12块原油间的界面张力在含盐量30～210g／L时维持10^-3～10^-4mN／m超低值，受含盐量的影响相对较小，动态界面张力迅速达到稳定。含Y2的表聚二元体系即使Y2浓度增至2．5g／L，黏度仍小于10mPa·s。含AP-P5的表聚二元体系在温度超过60℃后，黏度快速上升，在AP-P5浓度超过1．0g／L后，98℃黏度快速上升，含盐量达到230g／L时为54～59mPa·s。3．0g／L MJ2＋1．5g／LAP-P5体系为最佳体系，在98℃老化150天过程中界面张力波动小，150天后黏度31．3mPa·s。在98℃用此体系在天然岩心上驱油，注入段塞体积为0．25～0．30PV，采收率提高值为14．3％～15．8％。图8表3参2。
Aimed at petroleum reservoirs of higher temperature and salinity in Zhongyuan, the interracial tension, IFT, apparent viscosity, μa, salt tolerancy, and thermal stability at 98℃ are investigated for 4 surfactant/polymer （SP）follding systems （solutions） composed of petroleum sulfonate surfactants MJ2 and DQ, HPAM polymer Y2 of M = 2.4 × 10^7, and hydrophobically associating polymer AP-P5 of hydrophobe content 0.25%. The SP systems are prepared in an Ca^2＋ ＋ Mg^2＋ containing produced water with TSD = 122.4 g/L of Hu-12 block or, in cases of salt tolerancy tests, in NaCl salt water. The basic experimental SP systems are composed of 3.0 g/L sulfonate and 1.5 g/L polymer. The IFT of MJ2 containing SP systems with crude oil of Hu-12 block maintain ultralow values of 10-3--10-4 mN/m and vary in relatively narrow range with changing salinity at NaCl salinity 30--210 g/L while their transient IFT values become stable very fast. Y2 containing SP systems have ,μa values lower than 10 mPa·s even at high Y2 concentration of 2.0 g/L. For AP-P5 containing SP systems, their ,μa values rise significantly with raising temperature up to 〉60℃ and with raising AP-P5 concentration up to 〉1.0 g/L, being of 54 and 59 mPa·s at 98℃ and at salinity of 230 g/L. The optimal composition of SP system is 3.0 g/L MJ2 （or DQ） ＋ 1.5 g/L AP-P5, for which the IFT value varies in narrow range in ageing at 98℃ in 150 days and the μa value in 150 days of ageing is of 31.3 mPa·s（or 20 mPa·s）. In reservoir core flooding experiments at 98℃ with water flood finished, an enhancement in oil recovery （EiOR） in range 4.9----19.7% is observed when 0.05--0.50 PV of this MJ2/AP-P5 SP system injected and the optimal size of SP slug is of 0.25--0.30 PV with EiOR being of 14.3--15.8%.
出处
《油田化学》
CAS
CSCD
北大核心
2008年第1期77-81,共5页
Oilfield Chemistry
关键词
表面活性剂/聚合物二元复合驱油体系
石油磺酸盐/疏水缔合聚合物体系
界面张力
黏度
耐盐性
热稳定性
驱油效率
surfactant/polymer combinational flooding systems
petroleum sulfonate/hydrophobically associating polymer sys-tem
interfacial tension
viscosity
salt tolerancy
thermal stability
oil displacement efficiency
