Results:
- Conversion from Gas Lift to UHS ESP™ is considered successful;
- 600 days of stable operation;
- The dependence from gas prices and compressor is eliminated;
- Compressor-based shutdowns are eliminated;
- Free gas content at the pump intake over 30%
- Total cost of ownership has been reduced by 26%
The client’s field is in Trinidad and Tobago. The offshore reservoir is at 3,910 ft TVD (1,192 m TVD), the operated well is completed with a 7 5/8” API Casing, the oil API is 27.3, and the water cut within 80%. The gas content at pump intake was evaluated at the level above 30%.
Lex was challenged to conduct the artificial lift method conversion from a Gas Lift to an Electric Submersible Pump in the well with undefined inflow.
The reasons behind this request were:
- Rising gas prices;
- Compressor reliability (regular shutdowns and maintenance);
- Oil losses during well shut downs.
Following research and detailed analysis of the well conditions, we recommended installing the UHS ESP™ system, with a nameplate speed of 10,000 rpm. We proposed installing the wide-range UHS-1000 system designed for NP flow range from 505 to 1385 bblpd, with BEP at 1000 bblpd (80-220 m3/d with 159 m3/d at BEP), with integrated advanced gas handling device and downhole gauge Hunter-X.
In April 2020, the Lex field service crew travelled to Trinidad and Tobago to complete pre-installation checks, start-up, commissioning, on-site daily monitoring, and equipment performance reviews.
Based on the Total Cost of Ownership savings valuation of 26%, the conversion has been considered successful. UHS ESP™ stabilized the production and eliminated unexpected shutdowns associated with the gas compressor.
This project has confirmed the feasibility of UHS ESP™ for the conversion from Gas Lift.
