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Annular Pressure Test

In this document we describe the load case "Annular Pressure test" available in Oliasoft WellDesign™.​


Annular Pressure test is a collapse load case, where the unknown is the internal pressure profile of the tubing.

NOTE!
Note: In this documentation we denote any tubular as casing or tubing. All calculations however encompass any tubular, such as tubings, casings, liners, tie-backs etc.


Summary​

This load case is calculated using the hydrostatic pressure from mud for drilling a new section from RKB to the casing shoe.

Override wellhead pressure will affect the pressure from hanger to the casing shoe.


Illustrating Pressure Profile Graph​

The picture is from the pressure profile “Drill ahead”


Inputs​

The following inputs define the drill ahead load case:

  1. The true vertical depth (TVD) along the wellbore as a function of measured depth. Alternatively, the wellbore described by a set of survey stations, with complete information about measured depth, inclination, and azimuth.

  2. The true vertical depth / TVD of

    a. The hanger of the tubing, TVDhanger_{hanger}

    b. The shoe of the tubing, TVDshoe_{shoe}

  3. The mud weight/density, ρm\rho_m, for drilling the next section.