AM/AMPS/DMAM三元共聚物的制备及其性能

Preparation and Properties of the Temperature Resistant and Salt Tolerant AM/AMPS/DMAM Copolymer

海上油田多具有井距大、地层水矿化度高以及平台空间有限等特殊性,常规线性聚合物驱油剂往往难以满足耐温抗盐、长期稳定性好、产出液易处理等特殊的要求。本文通过引入功能单体2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、N,N-二甲基丙烯酰胺(DMAM)与丙烯酰胺(AM)发生共聚合反应制备了新型耐温抗盐AM/AMPS/DMAM三元聚合物,其单体的质量比为78∶20∶2。通过功能单体的引入,三元共聚合物具有良好的耐温抗盐性能,在85℃、配制水矿化度32000mg/L条件下(钙镁离子浓度1000mg/L),质量浓度2000mg/L的AM/AMPS/DMAM三元聚合物溶液的黏度不低于20mPa·s,85℃下老化2个月后的黏度保留率≥75%。该聚合物提高采收率不仅比普通聚合物的高5%,而且还具有产出液易于处理的优势,可以满足海上平台的要求,有望应用于海上油田。

Most offshore oilfields have special conditions such as large well spacing,high salinity of formation water,and limited platform space. Conventional linear polymer flooding agents are often difficult to meet the special requirements of temperature resistance,salt resistance,long-term stability and easy processing of production fluid. AM/AMPS/DMAM ternary polymer was prepared by copolymerization of 2-acrylamide-2-methylpropionic sulfonic acid(AMPS),N,N-dimethylacrylamide(DMAM)and acrylamide(AM)with a mass ratio of 78∶20∶2. Due to the introduction of functional monomers,ternary copolymers had good temperature resistance and salt resistance. Under the conditions of 85℃and 32 000 mg/L of water salinity(containing Ca2 +,Mg2 + 1000 mg/L),the viscosity of the developed polymer solution with the concentration of 2000 mg/L was more than 20 mPa·s,and the retention rate of viscosity was more than 75% after ageing for two months at the temperature of 85℃. At the same time,the developed polymer not only enhanced the oil recovery by 5% higher than did the ordinary polymer,but also had the advantage of easy processing of the produced fluid,which could meet the requirements of offshore platforms and was expected to be applied in offshore oilfields.