Injection Down Casing

In this document we describe the load case "Injection down casing"#

Injection down casing is a burst load case, where the unknown is the internal pressure profile of the casing / tubing

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 is a load case that models an applied surface pressure to a static fluid column.

Printable Version#

Oliasoft Technical Documentation - Injection Down Casing

Inputs#

The following inputs define the injection down casing 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
1. The hanger of the casing/tubing, $TVD_{hanger}$
2. The shoe of the tubing, $TVD_{shoe}$
3. The applied injection pressure, $p_{inj}$
4. The density of the injection fluid, $\rho_{inj}$

Calculation#

The internal pressure profile of the tubing is simply calculated as

$p_i = p_\text{inj} + \rho_\text{inj}\, g\, h, \qquad\quad \text{TVD}_{\text{hanger}} \leq h \leq \text{TVD}_{\text{shoe}}$