When gas is injected into an oil reservoir, it increases the reservoir pressure in order to maintain the desired production level or stimulate recovery of additional oil. This is a particularly valuable technique for mature fields where production has naturally declined over time.GE Oil & Gas has been a global leader in high-pressure re-injection technologies since the early 1970s, offering many proven solutions for gas re-injection.
The gas used for re-injection is usually the associated gas separated from the crude oil in the flash and stabilization phases. Recent material advances allow associated sour gases with high H2S and/or CO2 content to be re-injected without the need for sweetening. Nitrogen or carbon dioxide may also be used.
Gas is injected into dedicated wells where it increases pressure and forces oil toward the well bores of the producing wells.
Water re-injection is similar, using production water separated from the crude oil, treated before re-injection.
Gas re-injection typically requires high-pressure barrel compressors, though reciprocating units may be used for moderate gas flows. Water re-injection requires high-pressure centrifugal pumps.
Very high injection pressures are required, so compression and pumping technologies are critical.
GE provides comprehensive solutions , including pumping and compression trains, gas separators, coolers, valves, piping, electrical and control systems
Compressor designs focus on rotordynamics and gas sealing to minimize vibration and toxic release
GE's full-load string test facilities closely reproduce mechanical and thermodynamic performance in the field for verification of critical features
- Well-designed re-injection plants typically increase field exploitation rates by up to 20%