摘要
实验测定了法国SNF公司的AN913（M^-=1．72×10^7，HD=15．0％）、AN923（1．92×10^7，20．0％）、AN934（2．11×10^7，31．0％）3种聚合物在驱氧并化学稳定的浓度1．0g／L的污水溶液中，在180小时热老化过程中水解度和溶液黏度（30℃）的变化。55℃老化的溶液用矿化度2．23g／L、pH9．0的下二门油田污水配制，70℃和80℃老化的溶液用矿化度5．33g／L、pH9.1的双河油田污水配制。水解度～老化曲线表明油藏条件下HPAM的水解是典型的自阻滞反应，初期水解快速，后期减慢，最终趋于稳定；初始水解度越低则水解越快；温度越高则水解越快且不同水解度聚合物的水解曲线越接近；55℃时的水解仍很明显。溶液黏度～老化时间曲线相似但有所不同：老化初期黏度增加快，达到最高值后维持稳定（55℃和80℃）或缓慢减小（70℃）；达到最大黏度的老化时间，55℃下为100天，70℃下为60天，80℃下为30天；水解度越低则黏度增加越快；在70℃老化30天和在80℃老化5天后，AN913溶液的黏度超过AN923和AN934。以3种聚合物溶液黏度对水解度（15％～68％）作图，水解度达到～30％前黏度增大，以后大体稳定，水解度大于60％后略有下降；用HPAM水溶液结构和污水低钙镁含量（26.32mg／L）解释这一结果。讨论了HPAM水解度对油藏的适应性：在55℃的下二门油藏及70℃和80℃的双河油藏，聚合物驱中分别使用水解度25％～30％、20％～25％、15％～20％的HPAM。图7表1参14。
The changes in hydrolysis degree, HD, and solution viscosity are determined experimentally for HPAM polymers AN913 （M^- = 1. 72 ×10^7, HD = 15.096 ）, AN923 （1.92 × 10^7, 20.096 ）, and AN934 （2.11 × 10^7, 31.0 % ） in the course of thermal ageing in 1.0 g/L polymer solution, O2 free and chemically stabilized. The solution to be aged at 55℃ is prepared in Xiaerrnen＇s produced water of TSD = 2.23 g/L and oH = 9.0 and at 70℃ and 80℃-in Shuanghe＇s produced water of TSD = 5.33 g/L and pH = 9.1. The HD-ageing time curves show that the hydrolysis of HPAMs under the reservoir conditions is a typical self-retarded reaction, proceeds fast at the initial stage, slows down then and stops finally; the lower the original HD value the faster the hydrolysis proceeds; the higher the ageing temperature the faster the hydrolysis proceeds and the closer each to other the hydrolysis curves of HPAMs of different HD are; the hydrolysis at 55℃ appears rather notably. Solution viscosity-ageing time curves are similar and distinguished by following statements： the viscosity increases fast at the early stage, reaches and keeps a high level （at 55℃ and 80℃ ） or decreases very slowly （at： 70℃ ） ; the ageing time needed to reach the highest viscosity is of 100 days at 55℃, 60 days at 70℃, and 30 days at 80℃ ; the lower the original HD value the faster the viscosity increases; the solution viscosity of AN913 exceeds that of AN923 and AN934 in 30 days of ageing at 70℃ and in 5 days of ageing at 80℃. In plotting the solution viscosity vz HD values in range 15- 68% for the 3 polymers, the viscosity increases with HD when HD≤-30% and then maintains at a stable level and slightly decreases at HD 〉60% ; this phenomenon is explained in terms of the aqueous solution structure of HPAM and low Ca^2＋ ＋ Mg^2＋ concentration （26 and 32 mg/L）. The conformity of HD value to reservoirs is discussed and it is stated that in polymer flood projects at reservoirs of Xiaemen of 55℃, of Shuanghe of
出处
《油田化学》
CAS
CSCD
北大核心
2006年第3期235-238,255,共5页
Oilfield Chemistry
关键词
聚合物HPAM
热老化
水解
水解度
溶液黏度
油藏环境
聚合物驱
河南下二门/双河油田
polymers HPAM
thermal ageing
hydrolysis hydrolysis degree solution viscosity
reserwir media
polymer flood Xiaermen/Shuanghe oil fields in Henan
