泡沫调驱体系性能评价

Performance Evaluation of Foam Profile Control and Flooding System

目前,调驱体系性能评价主要是研究发泡剂所产生的泡沫在地层中的实际作用能力。既然是被应用于注蒸汽开发用的调驱剂,不仅要满足耐高温的条件,而且应该具备能够产生大量泡沫的能力,生成的泡沫应该具有较高的黏度,流动性应较差,这样的泡沫对注入到地层的高温蒸汽具有良好的封堵能力,从而提高蒸汽驱的驱油效率。通常情况下,采用室内物理模拟实验的方法对泡沫调驱体系进行性能评价,包括静态性能评价和动态性能评价。其中,静态性能评价实验是指在室温条件下对样品的界面张力的测定、样品的衰减规律曲线的绘制以及样品在高温条件下的起泡体积以及泡沫稳定时间的测定;动态性能评价包括温度、调驱剂浓度、气液比、渗透率、压力等对泡沫在高温地层内实际作用情况的影响[1]。

At present, the performance evaluation of profile control and displacement system mainly focuses on the practical role of foam produced by blowing agents in formation.Since it is being applied to steam injection development for flooding agent, not only to meet the high temperature conditions, but also should have the ability to produce a large number of bubbles, bubble generation should have a higher viscosity, liquidity should be poor, so the foam has good sealing ability of the high temperature steam is injected into the formation, thus to improve the oil displacement efficiency of steam flooding.Normally, we evaluate the performance of foam displacement control system by physical simulation experiments, including static performance evaluation and dynamic performance evaluation.The experimental evaluation of static performance refers to the determination of interfacial tension of samples was measured and the sample attenuation curve drawing and sample under high temperature foaming volume at room temperature and foam stability time ; dynamic performance evaluation including temperature, flooding effect agent concentration, gas-liquid ratio, permeability, pressure and so on the actual effect of bubble formation at high temperature.