摘要
实验研究了动力粘度 η、动态储能模量G′、转变压力Pt(TGU值 )测量 3种方法用于表征油田用特别是提高采收率用聚合物凝胶 (弱凝胶和较强凝胶 )相对强度的适宜性和准确性。在 η和G′测定了使用了 3种代表性凝胶 :( 1 )聚合物浓度不同的HPAM/Cr3+凝胶 ,即柔性链聚合物弱凝胶 ;( 2 )组成固定的PAM /木素磺酸钠 /Cr3+凝胶 ,为较强凝胶 ;( 3 )组成固定的黄胞胶 /Cr3+凝胶 ,即刚性链聚合物脆性凝胶。在Pt 测定中使用聚合物浓度不同的另一种HPAM/Cr3+凝胶。得到的结论如下。对于柔性链聚合物弱凝胶 ( 1 ) ,当G <0 .1Pa时 ,η值是相对强度的良好表征值 ,G′越小 ,则 η测定的重现性越好 ,G′测定的重现性越差。对于较强凝胶 [( 2 ) ,G′ >0 .1Pa]和刚性链聚合物形成的脆性凝胶 ( 3 ) ,η测定的偏差很大 ,凝胶越强 ,则G′测定的重现性越好。对于结构易破坏的脆性凝胶 ,振荡法测量 (G′、G″、η )是表征相对强度的适当方法。Pt(TGU值 )测定的重现性很差且有不少困难问题 ,因此不能用作凝胶性能的基础数据。
The suitability and accuracy of dynamic viscosity, η , storage shear module, G′ , and transition pressure, P t, measurements for characterizing the relative strength of polymer gels, weak and more strong for oilfield operations and for EOR, in particular, are studied. For η and G′ measurements three presentative grades of gels are used: ① HPAM/Cr 3+ gels of varying HPAM concentration as flexible chain polymer weak gels; ② an PAM/SLS/Cr 3+ gel as stronger gel; ③ a xanthan/Cr 3+ gel as rigid chain polymer brittle gel. For P t determination another HPAM/Cr 3+ weak gels of varying HPAM concentration are used. The following conclusions are made. For the weak gels①with G′ <0.1 Pa, η value is a good characteristic and the less the G′ value the better the reproductivity of η determinations and the worse the reproductivity of G′ determinations are. For the stronger ( G′ >0.1 Pa) gel② and the brittle gel③, large errors appear in η measurements and the stronger the gel the better the reproductivity of G′ determinations is in oscillating measurements. The oscillating measurements for G′,G″ and η are appropriate characteristics for relative strength of easily destructive brittle gels. The reproductivity of P t determinations is extremely low and many problems may arise thus P t value can not serve as the basic data of gel properties.
出处
《油田化学》
CAS
CSCD
北大核心
2001年第3期255-259,共5页
Oilfield Chemistry
关键词
聚合物凝胶
相对强度
测定方法
动力粘度
动态储能模量
弱凝胶
调剖堵水剂
驱油剂
Polymer Gels
Relative Strength
Determinating Methods
Dynamic Viscosity
Storage(Shear)Module
Transition Pressure
Weak Gels
Water Controlling Agents
Oil Displacement Agents
