The Effect Of Regular And Long Cyclic Steam Stimulation Method On Oil Production Performance In X Field

Abstract

Cyclic Steam Stimulation (CSS) is the process of a single production well which is consisted of three phases: injection phase, soaking phase and the production phase. This analysis was performed only for regular cyclic and long cyclic stimulation. It can be performed more than one stimulation in a single production well which is called cyclic stimulation. It is because of the temperature reservoir is higher that the reservoir temperature base line in a short of time. Although the stimulation has been performed repeatedly, there is still decreasing of production oil. The variative of reservoir peak temperature and the existence of the possibility of damage on the pump after stimulation drive to do analyzing for these issues.

The analysis was performed by looking at the historical data of production, the reservoir temperature history data and the pump
production job data for all the wells in the X field. By analyzing the production history data, it was found that there are increasing
and decreasing of production oil after stimulation. It is because the production stages, ramp up and ramp down stage. At the ramp up stage, the production after stimulation will be higher than the previous stimulation.

Based on the production analysis, 53.24% production wells in the X field are already at the ramp down stage and 46.75% are already at the rump up stage. Based on the analysis of the reservoir temperature, it was known that 3rd to 4th months are the majority of the Heat Endurance Time (HET) for the regular cyclic stimulation and 5th-6th months are the majority of the HET for long cyclic stimulation in X field. Based on the pump job data, there are only three wells were damaged. It showed the cyclic stimulation is really safe to be performed in this field.