气溶胶发生器制备气溶胶体系影响因素

Influencing factors of aerosol system preparation by aerosol generator

针对气窜控制方法中高含水率易对地层造成伤害的问题,利用气溶胶作为气窜调控技术,研究气溶胶气液比、气液流量和压力的主要影响因素。利用ANSYS中Fluent等软件对气溶胶发生器的结构进行设计,研究气液质量流量和气液腔尺寸对气溶胶发生器内气液流动规律的影响,模拟计算气液注入参数与发生器出口压力的关系。结果表明:在一定的气体入口质量流量下,液体存在一个合理的流量区间,液体的上限流量和下限流量都随着二氧化碳流量(Q g)的增大而增大,但液体的上限流量变化更为显著;相比于泡沫驱、WAG等控制气窜方法,通过改变发生器中气腔/液体腔的横截面积比以及气体的注入参数,可以获得更宽的气液流量比范围,气液比上限可超过100,发生器的出口注入压力可超过20 MPa,满足现场气体的注入需要。

To overcome the problem of high water content easily causing damage to the formation in the gas channeling control method,the aerosols was used as gas channeling control technology investigate the main influencing factors of gas-liquid mass flow rate ratio,flow rate range and pressure.The structure of the aerosol generator was designed using the Fluent software in ANSYS.The effects of gas-liquid mass flow rate and gas-liquid chamber size on the gas-liquid flow regularity in the aerosol generator were studied,and the relationship between gas-liquid injection parameters and generator outlet pressure was simulated and calculated.It is shown that there is an optimal flow rate range for liquids at a given gas inlet mass flow rate.Both the upper and lower limit flow rates of the liquid increase with the increase of Q g,but the upper limit flow rate of the liquid changes more significantly.Compared to foam flooding,WAG and other methods of controlling gas channeling,by varying the cross-sectional area ratio of the gas/liquid chamber in the generator and the gas injection parameters,a wider range of gas-liquid flow rate ratios can be obtained.The upper limit of the gas-liquid ratio can exceed 100 and the outlet pressure of the generator can reach 20 MPa or more,which meets the need for gas injection.