摘要
本研究中使用分子量2.5×107的一种抗盐HPAM,柱状人造均质岩心,实验条件模拟大庆主力油藏条件,聚合物溶液用矿化度3700 mg/L的盐水配制。聚合物溶液在岩心中的阻力系数Fr和残余阻力系数Frr随聚合物浓度的增大和岩心渗透率的减小而增大,高浓(2500 mg/L)溶液与常浓(1000 mg/L)溶液的Fr值比和Frr值比,岩心Kg=1.0μm2时最小,分别为3.7和3.2,Kg=1.5μm2时最大,为30.0和29.3,Kg=0.5μm2时为3.3和14.1。在Kg为2.26,0.47,0.15μm2的高、中、低渗三岩心并联的非均质模型上,水驱之后注入高浓溶液0.570 PV,与注入常浓溶液1.425 PV相比,高、中、低渗岩心和岩心组的聚驱采收率增值分别提高1.6%,2.1%,8.9%和4.2%,最终采收率分别提高2.0%,2.9%,9.1%和4.7%。讨论了常浓和高浓聚合物驱中不同渗透率油层(岩心)的动用程度。表3参5。
A salts resistant HPAM polymer of M^-= 2.5×10^7 and artificial cylinderic homogeneous cores are used in this study under simulation conditions of Daqing main oil reservoirs; the polymer solutions are prepared in a brine of TSD = 3.7 g/L. The resistance factor, Fr, and the residual resistance factor, Frr, of the polymer solutions in cores increase with increasing polymer conoentration and decreasing core permeability; the values of Fr and Frr for high concentrated, 2.5 g/L, solution （HCPS） reduced by that for normal concentrated, 1.0 g/L, solution （NCPS） are small in cores of Kg= 1.0 μm^2, 3.7 and 3.2, medium in cores of Kg-0.5 μm^2 ,3.3 and 14.1, and large in cores of Kg= 1.5μm^2, 30.0 and 29.3, respectively. For a heterogeneous physical model model of 3 paralell cores of decreased pemeability Kg 2.26,0.47 ,and 0.15 μm^2, 0. 570 PV of HCPS injected after water flood finished results in an increase in enhancement of oil recovery of 1.6% ,2.1% ,8.9% and 4.2% and in extreme enhancement of oil recovery of 2.0%, 2.9% ,9.1%, and 4.7% from the high, intermediate and low permeable cores and the core set, respectively, in comarision with the case of 1.425 PV of NCPS injected. The degree of mobilization of zones （cores） of different permeability by NCPS and HCPS is discussed.
出处
《油田化学》
CAS
CSCD
北大核心
2006年第1期85-87,共3页
Oilfield Chemistry
关键词
聚合物溶液
高浓度
渗流参数
驱油效率
非均质物理模型
聚合物驱
大庆油田
polymer solution
high concentration
flow-through-porous media parameters
oil displacement efficiency
heterogeneous physical model
polymer flood
Daqing oil fields
