In a flowing well there is enough energy stored in the reservoir to flow the well to the surface, this energy is furnished by a combination of reservoir pressure and formation gas. Under some reservoir conditions, for example, if the differential pressure is not sufficient enough to drive the production fluid to surface and maintain production at an economic level, it becomes necessary to install artificial lift. Gas Lift is the process of injecting high pressure gas into the production tubing to boost the reservoir energy and lighten the hydrostatic head. This artificial lift is achieved by either the expansion of injected gas in the well, reducing the fluid gradient, the displacement of fluid by compressed gas, or a combination of one or more of these. There are two recognized types of artificial lift, ‘Continuous Flow’, most common in wells with high fluid levels but insufficient gas pressure and/or volume to flow naturally; and ‘Intermittent Flow’, in wells with low productivity wells where the injection of gas on an intermittent basis is used to drive a build-up of liquid in the wellbore to surface. The Gas Lift installation may also be used when produced fluids contain corrosive components such as CO2, or have high pour points with attendant flowing pressure loss problems. In such cases, it may be necessary to introduce specific chemicals into the flow string at a location deep within the well to provide maximum benefit and counteract the impact of these characteristics.PTP provides complete Gas Lift and Chemical Injection Systems tailored to specific requirements.
