两种新型驱油聚合物在多孔介质中的黏弹性  

A Study of Viscoelasticity of Two Novel Polymers for EOR in Porous Media

作　　者：朱怀江[1] 罗健辉[1] 孙尚如[2] 杨静波[1] 王平美[1] 孔柏岭[2] 

机构地区：[1]中国石油勘探开发研究院采油所,北京100083 [2]中国石化河南油田分公司勘探开发研究院,河南南阳473132

出　　处：《油田化学》2006年第1期63-67,84,共6页Oilfield Chemistry

基　　金：国家重点基础研究"大幅度提高石油采收率的基础研究"专项资助(编号:G199022500)部分成果

摘　　要：以HPAM ART525和MO-4000为对比，对疏水缔合聚合物HAP3和抗盐梳形聚合物CP4污水溶液的黏弹性进行了实验研究。实测参数为：HAP3、CP4与HPAM的表观黏度比Rη和储能模量比RG，HAP3、CP4的弹性黏度ηe（达西黏度与表观黏度之差）。讨论了ηe的测定原理。CP4的Rη和RG′小，溶液浓度Cp增大时增幅小，30℃、70℃的Rη～Cp曲线几乎重叠，CP4耐温性好。随Cp增大（在cac以上），HAP3的Rη大幅度上升而RG，大幅度下降，70℃的Rη～Cp曲线较30℃曲线大幅下移，HAP3黏度对温度敏感。1000mg／L聚合物溶液流经1．0μm^2岩心测得的ηe，ART525最小，CP4次之，HAP3最大；随γ增大，前二种聚合物ηe增大而HAP3的ηe却减小且随渗透率增大而明显减小，反映疏水缔合结构的易破坏性。认为HAP溶液通过多孔介质流动的压力降，除黏性和弹性分量外，还包含疏水缔合分量．后者应大于前二者之和，由此推断，HAP体系注入时起压快，注入压力高，易进入低渗区，造成的封堵易被破坏。将0．3PV浓度1000mg／L的聚合物溶液注入1．0／μm^2的岩心，ART525、HAP3、CP4提高采收率增幅分别为7．62％、11．28％、12．10％。用HAP溶液中形成类似“项链”结构的疏水缔合聚集体解释HAP3的黏弹性。图6参10。The viscoelastic properties of a hydrophobicaUy associating polymers, HAP3, and a salts tolerant comb-shape polymer, CP4, in brine solutions are studied experimentally in comparison with cornmereial HPAM polymers ART525 and MO-4000. The characteristics determined are： apparent viscosity ratio, Rη, and storage modulus ratio, RG, of HAP3 or CP4 and of an HPAM; elastic viscosity, ηe（ = ηD- ηa） where ηD denotes Darcy＇s viscosity）, of HAP3 and CP4. The principles of determining ηe are presented. For CP4, the values of Rη and RG are not large and increase slighly with increasing polymer concentration, Cp; the Rη- Cp curves at 70℃ and 30℃ are nearly superposed, which indicates gocd heat resistance of CP4. For HAP3, the Rη increases and the RG decreases significantly with increasing Cp at Cp 〉 cac and the Rη-Cp curve iS moved downwardz when the temperature raises from 30℃ to 70℃, indicating sensibility of HAP3 to temperature changes. The ηe value of 1000 mg/L polymer solution flowing through a core of permeability 1.0 μm^2 is smallest for ART525, medium for CP4 and largest for HAP3; the ηe value of ART525 and CP 4 in creases and of HAP 3 decreases with increasing shear rate ; the ηe of HAP 3 decreases more notably with increasing corepermeability, which indicates easiness of destruction of hydrophobic association aggregates. It is stated that the total flowing pressure drop of HAP polymer solutions through porous media consists of viscosity and elasticity components and an additional component contributed by hydrophobic association with the latest term being larger than the summation of former two and it is deduced that the injection pressure of HAP systems into reservoir formations will increase fast to a high level and that these systems will enter into lower permeable zones and ereate destroyable blockages. Injecting 0.3 PV of 1000 mg/L polymer solution into a core of 1.0 μm^2 results in an enhancement in oil recovery of 7.62%, 11.28%, and 12.10% when ART525, HAP3, and CP4 used, resp

关 键 词：驱油用聚合物 聚合物水溶液 黏弹特性 渗流特性 弹性黏度 驱油机理 疏水缔合 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程] TE39