Gas-lift well

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Casing designs for wells in which gas-lift completions are to be installed are based upon different design load cases from standard wells. They have to be treated differently from standard wells in two respects:

  1. definition of the possible pressure profiles within the "live" tubing/production casing annulus (A-annulus)
  2. design of the intermediate casing to withstand the consequences of a leak in the production casing for subsea wells.

A-annulus pressure profiles for the production phase should be constructed, in close cooperation with the Production Technologist, for the following production-mode cases:

  • kick-off;
  • gas lift;
  • closed in, and assuming a leaking gas lift valve;
  • evacuation to unpressured injection gas.

Note that casing design for the drilling phase is based on the standard design criteria.

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