塔河油田耐温抗盐驱油聚合物的筛选及性能评价

Screening and performance evaluation on temperature tolerant and salinity resistant polymer used in the Tahe Oilfield

随着原油开采的不断进行,三次采油已逐渐向高温高盐油藏转移,苛刻的油藏环境对三次采油用水溶性高分子聚合物的要求也越来越高,因此,亟需能够适用于高温高盐油藏的驱油聚合物。对19种耐温抗盐聚合物在塔河油藏环境下的溶液性能展开研究,并探索聚合物驱在塔河高温高盐油藏的应用潜力。首先,使用流变仪对19种聚合物溶液开展了耐温抗盐性能评价,发现NK-2、热增黏聚合物SAV1、K21与天然高分子BP在塔河油藏环境下的剩余黏度与黏度剩余率相对较高,具有良好的耐温抗盐性能。对以上4种耐温抗盐聚合物进行抗剪切性能与长期热稳定性能评价,发现天然高分子BP的长期热稳定性能最为优异。当注入0.5 PV的0.05%BP溶液后,驱油效率可在一次水驱的基础上提高5.6%。

As oil production continues,the tertiary oil recovery(TOR)has gradually stepped to high-temperature and highsalinity reservoirs,but their harsh situations have stricter requirements on TOR water soluble high-molecular polymers.Therefore,it is in urgent need to develop the oil displacement that are applicable to high-temperature and high-salinity reservoirs.The performances of 19 kinds of temperature tolerant and salinity resistant polymer solutions in the setting of Tahe oil reservoir were researched and the application potentials of polymer flooding in Tahe high-temperature and high-salinity reservoirs were explored.The temperature tolerant and salinity resistant performances of 19 kinds of polymer solutions were evaluated by virtue of the rheometer.It is shown that in the setting of Tahe oil reservoir,NK-2,thermoviscosifying polymer SAV1,K21 and natural high-molecular BP have higher residual viscosity and viscosity residual rate and present good temperature tolerant and salinity resistant performances.These four kinds of temperature tolerant and salinity resistant polymers were evaluated from the aspects of shearing resistance and long-term thermal stability.It is revealed that the natural high-molecular BP is the best in the long-term thermal stability.After 0.05%BP is injected by 0.5 PV,the oil displacement efficiency can be increased by 5.6%on the basis of the primary water flooding.