不同降压体系降压效果实验研究

北一区三类油层储层物性变化大、剩余油分布零散,导致其水驱挖潜难度大,在水驱开发过程中往往出现注水井注入压力高,吸水能力差的问题,针对上述问题进行实验室降压增注实验研究,对比不同配方降压剂对水驱提高采收率的影响,并根据北一区三类油层注入水有严重的结垢趋势,提出在降压剂配方中加入阻垢剂的措施。纳米聚硅和生物酶体系的降压率分别为18.79%,16.86%,4种活性剂体系的降压率分别是22.09%,25.47%、20.20%,21.55%,活性体系的降压率会随着注入量的增加出现小幅度的上升。综合分析实验结果提出两种可供现场使用的方案:注入甜菜碱一元活性体系,注入浓度为0.2%,注入量为0.1 PV;由0.2%石油磺酸盐和0.6%阻垢剂组成二元体系,优选0.15 PV的注入量。

Experimental study on the antihypertensive effect of different antihypertensive system

For the stray remaining oil distribution and great physical properties of tertiary-main layers on North One area, which is hard to tap the potential. Duing waterflooding injection wells are characterized by poor absorption and high injection pressure. Aimed at the problem the experiments of depressurization and augmented injection were developed in the laboratory. Comparing different formulations antihypertensive agents on the impact of injection rate on waterflooding enhanced oil recovery. As the injected water of tertiary-main layers on North One area has serious scaling trends, inhibitor can be added in the formulation of Antihypertensive agent. Nanometer silicon polymer and Enzymes system depressurization rate were 18.79%and 16.86%, Four kinds of surfactant system depressurization rate are 22.09,25.47,20.20,21.55%. Antihypertensive rate of betaine activity system can be rised at a small amplitude with the increase of injection. By analyzing the experimental results,get the following two options for site use：Injection of betaine is unary yuan activity system,injection concentration is 0.2%;injection volume is 0.1 PV, petroleum sulfonate system is the binary system of 0.2% petroleum sulfonate and 0.6% scale inhibitors,injection volume is 0.15 PV.