Well Dynamic Behaviour

Keywords: coning, cusping, radial flow, productivity index (PI), skin, acidising, routine

production testing, bottom hole pressure testing, drill stem testing, horizontal wells,

cresting, productivity improvement factor, tubing performance curves, perforating, artificial

lift, gas lift, beam pumps, electrical submersible pumps, hydraulic pumps, well completion,

christmas tree, sand control, gravel packing.

Introduction and CommercialApplication: Section 8.0 considered the dynamic behaviour

in the reservoir, away from the influence of the wells. However, when the fluid flow

comes under the influence of the pressure drop near the wellbore, the displacement

may be altered by the local pressure distribution, giving rise to coning or cusping. These

effects may encourage the production of unwanted fluids (e.g. water or gas instead of

oil), and must be understood so that their negative input can be minimised.

The wells provide the conduit for production from the reservoir to the surface, and are

therefore the key link between the reservoir and surface facilities. The type and number

of wells required for development will dictate the drilling facilities needed, and the

operating pressures of the wells will influence the design of the production facilities.

The application of horizontal or multi-lateral wells may where appropriate greatly reduce

the number of wells required, which in time will have an impact on the cost of

development.

Horizontal or multi-lateral wells can also be used to cost efficiently access remaining oil

in mature fields.

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