The Effect Of Pressure On The Stability Of Fire Flooding And Mechanism Analysis

This paper is aimed at the phenomenon of the pressure in the fire flooding laboratory experiment is still a blank,and carried out an indoor fire-flooding experiment on the basis of previous experimental research on the physical model of fire flooding,and initially discussed the changes of the pressure field and the stability of the combustion process.Firstly,a preliminary analysis of the combustion front pressure and the leading edge pressure difference was conducted using a 1D combustion tube experiment.It can be seen that when the front pressure of the combustion tube is controlled at about 1.2MPa,combustion can be better maintained.According to the pressure difference curve,the maximum pressure difference at the leading edge is 564 KPa,and the thickness of the oil wall is calculated to be about 12 cm.Secondly,using the modified 3D THAI fire flooding model,a comparative experiment of multiple sets of 3D THAI fire flooding was completed.The variation of the temperature field during the experiment and its corresponding relationship with the coking zone were studied.The relationship between the gas injection rate and the production pressure difference,the production pressure difference and the produced gas concentration was analyzed.Experimental results show,when the displacement pressure is controlled between 300~400KPa,the fire flood combustion can be stably performed,and the dynamic distribution of the pressure difference at the five locations within the fire flooding model can be obtained.Finally,numerical simulations are used to optimize the key parameters affecting stable combustion such as gas injection rate and injection and production well spacing to provide reference for the next indoor fire test.