Chapter 5

Choke Performance

Abstract

Wellhead chokes are used to limit production rates for regulations, reduce liquid loading problems, avoid sand production problems due to high drawdown, and control flow rate to avoid water or gas coning. Two types of wellhead chokes are used: positive (fixed) chokes and adjustable chokes. Placing a choke at the wellhead means fixing the wellhead pressure and thus the flowing bottom-hole pressure and production rate. For a given wellhead pressure, the flowing bottom-hole pressure can be determined by calculating pressure loss in the tubing. If the reservoir pressure and productivity index are known, the flow rate can be determined on the basis of inflow performance relationship. This chapter presents and illustrates ...

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