The systematics of petroleum production from a borehole shows that the rate of fluid flow is directly proportional to the reservoir pressure. Hence, flow rate in low reservoir pressure boreholes needs to be enhanced by an artificial system.
There exist several artificial lift systems, amongst which;
Basic concepts and definition of terms
Wells never actually attain absolute flow potential due to the fact that for fluids to flow out of the well to the surface, the reservoir pressure (Pwf) must exceed the back pressure the producing fluids exert on the formation as it moves through the production system.
The back pressure or bottom hole pressure stops the fluid from moving up the surface. This pressure is served by the following components;
Artificial Lift Systems: these are enhanced means of overcoming bottom hole pressure so that a well can be produced at a desired rate. Artificial lifting is achieved either by gas injection into the borehole fluids to reduce hydrostatic pressure and improve buoyancy or using down hole pumps to provide additional lift pressure.
Artificial lifting is mostly associated to mature, depleted fields where average pressure (Pavg) has declined such that the reservoir can no longer produce under its natural energy. Artificial lift systems are also used in younger fields to increase production rates and improve project economics.
April 30, 2019
September 23, 2019