Abstract
Condensate blockage reduces the gas deliverability from gas condensate reservoirs, when the reservoir pressure drops below the dew point pressure. Several techniques are commonly used to avoid condensate banking, by maintaining higher reservoir pressure. However, these methods required large investment and resulted in temporary improvement in the gas production. In this paper, the effect of heat and pressure generated by using a novel technique (thermochemical reaction) will be investigated on the phase behavior of an actual gas condensate reservoir.
Several treatments were discussed in this paper to evaluate their effectiveness in removing the liquid banking and improving the gas production. Then, the effect of chemical treatment on altering the phase behavior for condensate reservoir was studied. To simulate the actual operations of condensate treatment; actual reservoir fluids were used. Peng-Robinson equation of state (EOS) was used to develop the EOS-model, employing WinProp from CMG suite, based on available data from the studied reservoir. Flash calculations were conducted at surface conditions, and the phase properties were studied as a function of pressure and temperature.
Moreover, managing hydrocarbon dew point can reduce the condensate process, i.e. the dew point can be adjusted in such a way that prevents the hydrocarbon condensation. Chemical treatments might be used to reduce the dew point and improve the condensate removal process. In addition to that, hydrocarbon condensation might form if the formation temperature become less than the dew point temperature. Therefore, condensation can be prevented by increasing the temperature to keep it above the dew point temperature. In situ heat generation technology is used as a new technique of maximizing the heat penetration and improve recovery efficiency of gas condensate at lower cost compared to the current practices.
