SMD驱油体系配方改进研究及应用

该文针对胜利油田原有的ＳＭＤ－Ⅰ驱油体系在应用时必须用清水配制且稳定性受地层水矿化度影响较大等问题，分析研究了粘土浓度、温度及电解质等因素对ＳＭＤ驱油体系成胶稳定性、流变性的影响。结果表明：体系要保持一定的稳定性，存在最佳粘土浓度；温度在１５℃以上时，体系基本保持稳定；地层水中的ＮａＣｌ是体系稳定的主要影响因素。在此基础上对ＳＭＤ驱油体系进行了配方改进，提出了可用污水配制并具有很强抗盐能力的ＳＭＤ－Ⅱ体系。物理模拟证明用该体系驱油可提高原油采收率１０％，矿场实际应用也取得了初步效果

. Improvement and application of SMD colloidal system.

n view of such problems as the initial SMD oildisplacement system of Shengli oilfield must be mixed by pure water and its stability sensitive to formation water with high salinity, the effect of some factors as clay concentration, temperature and electrolyte on the colloidal stability and rheology of SMD system has been studied in this paper. The result shows that there exists a critical clay concentration and a lowest temperature(15)for the system's stability, NaCl in formation water is the main factor to affect the stability. On this basis, a new system, SMDII, can be mixed by formation water and possesses strong salt resistance, was presented. Physical simulation shows that this system can enhance oil recovery by 10%, and a primary result has been obtained in field practice.