ESP with Jet Pump Advantages
- Increased drawdown and production gain in gassy wells;
- Reliable design with no moving parts and minimized risk of failure;
- Compact design allowing for passing high-DLS sections;
- Steady tolerance for gas, solids, high- temperature, and corrosive fluids;
- Easy wireline installation/retrieval of the pump from the well.
Overview
In gassy wells, gas often accumulates behind the annulus and increases the uplift pressure at the bottom. This can be caused by a faulty wellhead check valve, use of a packer or high line pressures at remote fields. As a result, the drawdown and well productivity reduces significantly.
Jet ESP artificial lift system combines Ultra-High-Speed ESP (UHS ESPTM) and Jet Pump in a single completion string.
The jet pump is in the well tubing above fluid level. Jet pump nozzle is hydraulically connected to ESP discharge through the well tubing, while jet pump intake is open to the well annulus.
UHS ESPTM provides power fluid to the jet pump, causing a drop in pressure. Gas from the annulus then enters the mixing chamber, forming a mixture with the produced fluid, forcing the mixture straight up to the wellhead. The reduced annulus pressure provides the reduction of bottom-hole pressure and increases drawdown resulting in a production gain.
Applications
- Failure to achieve the potential of well productivity;
- Remote locations;
- Offshore fields;
- ESP configurations under packer.
Application limits
- Min casing size 5.5″ (139.7 mm);
- Max sand 2,000 ppm (2,000 mg/l);
- Max free gas 75%;
- Max BHST 302 °F (150 °C).
