Abstract
The operator in China Sichuan gas field is often faced with challenges of efficiently removing water from aged gas production wells in which reservoir pressure depletes and liquid loading problem ensues. Applying the proper dewatering method is essential to keep the well flowing and avoid water accumulating in bottom hole. Among the many proven dewatering artificial lift methods, ESP (Electric Submersible Pump) technology has its advantage in wells which need a high volume of water produced with maximum pressure drawdown, which are beyond the capability of other artificial lift methods.
First introduced in year of 1984, the operator and ESP provider have made considerable progress to develop an ESP application method in the field through theoretical studies, field trials and regular production.
This paper concentrates on discussing the ESP sizing and optimization practice to tackle the corrosive, extremely gassy, fluctuating liquid inflow environment typically seen in gas wells - an area used to be perceived as infeasible for ESP technology. The methodology of well selection, completion string design and production management could be used for reference where there are similar challenges with Sichuan gas field.
