针对双河油田维护作业后水锁引起油井大幅减产的问题,通过室内实验研制出一种新型防水锁处理剂,其由质量分数为0.5％的SATRO、质量分数为0.05％的烷基磺酸钠和质量分数为0.03％的FX-02组成,并对该防水锁处理剂进行了配方筛选以及性能评价.结果表明,该新型防水锁处理剂能够有效降低油水间界面张力,使得油水界面张力达到超低(10-3 mN/m),同时具有良好的破乳性能,3h内破乳率达90％以上.室内岩心物理模拟实验结果表明,当防水锁处理剂注入量为10倍孔隙体积,温度为70℃,驱替压力为0.3 MPa,反应时间达到8h时,岩心渗透率保留率达85％以上,能够有效预防乳化堵塞和水锁效应对地层渗透率的伤害.现场已推广应用该防水锁处理剂12井次,有效率为100％.%In the case of the sharply declining of well production caused by water blockage, which was caused by maintenance operation due to the difference between layers in Shuanghe oilfield. A new type of waterlock-proof treatment agent is developed through laboratory experiments (0.5%SATRO+0.05%alkyl sodium sulfonate+0.03%FX-02). This paper mainly introduces the formulation screening of the waterlock-proof treatment agent and the performance evaluation.The results show that: this product can effectively reduce the interfacial tension between oil and water, causing the interfacial tension to reach ultra low( 10-3 MN/m); at the same time, the product with a good demulsification performance can make the demulsification rate up to 90% in 3 h; the laboratory core physical model experiment indicates that : when the injection rate of the waterlock-proof treatment agent is 10 PV, temperature of 70 ℃, displacement pressure of 0.3 MPa, reaction time up to 8 h, the remaining ratio of the core permeability reaches up to over 85%, which can effectively prevent emulsification blocking and the formation permeability damage caused by water lock effect. The waterlock-proof treatment agent has been applied in field for 12 wells, whose effective rate is 100%, remarkable results are achieved.
展开▼
