Mathematical Model of Gas Hydrate of Hydrogen Sulfide Formation During Its Injection into a Natural Layer

Abstract

The mathematical model of liquid hydrogen sulde injection into the semi-innite porous layer saturated with the oil and water accompanied by H2S gas hydrate formation is presented here. We considered the case when the hydrate formation occurs at the frontal border and the oil displacement's front by hydrogen sulde is ahead of this boundary. Solutions for pressure and temperature in every layer's area are built by help of the selfsimilar variable formation method. The values of the parameters of the moving interphase boundaries are found as the result of the iteration procedure. The coordinate dependence of phase boundaries on the injection pressure was studied on the basis of the obtained solutions. We have established that for the existence of solution with two dierent interphase boundaries, the injection pressure must be above a certain limiting value. The dependence of the limiting value of pressure on the initial temperature of the layer at dierent temperatures of the injected hydrogen sulphide is constructed. The results of the calculations showed that the constructed mathematical model with three areas in the reservoir gives an adequate description of the process at high injection pressures, the temperature of the injected hydrogen sulde and the initial temperature of the layer.