Page 76 - Well Control for Completions and Interventions

Well Construction and Completion Design 67

Figure 2.1 Casing and cementing the wellbore.

production casing is drilled out, the reservoir drilled, and the well com-
pleted. The type of completion will depend on the nature of the reser-
voir, and the different types of reservoir completion are discussed next.

2.2 TYPES OF COMPLETION

A completion is the final phase of the well construction process,
and forms the interface between the reservoir and surface production
facilities.
Wells can be producers or injectors, and completions may have to be
able to produce (or inject) hydrocarbon liquids and gas, water, steam, and
a range of stimulation chemicals. In addition, completions may have to
withstand the corrosive effects of nonhydrocarbon products such as CO 2
and H 2 S. Some completions will combine functions, e.g., annulus water
injection and through tubing production. Over the life of the well, con-
ditions can change and some wells may start life as production wells, and
be converted to injection as conditions in the reservoir change.