Page 258 - Well Control for Completions and Interventions

252 Well Control for Completions and Interventions

7.3.8 Reverse circulation: worked example 1. Plugged
vertical well
In this example, the well is vertical and equipped with a sliding sleeve a
short distance above the packer. The sleeve will be opened to allow circu-
lation. A plug has been installed in a seating nipple below the circulation
ports of the sliding sleeve (Fig. 7.1).
Planning requirements:
1. Calculate the gradient of kill weight fluid required to overbalance well
pressure at the SSD by 200 psi (for the purposes of this example, brine
weight temperature and pressure corrections have been ignored).
2. Calculate all necessary volumes.

SITHP 1900 psi

SICHP 0 psi

Oil gradient 0.35 psi/ft.
Annulus fluid gradient 0.52 psi/ft.

Kill fluid gradient 0.56 psi/ft.

SSD 10,300 ft.

Packer 10,330 ft.

Plug 10,350 ft.
Top reservoir
10,500 ft TVD
Reservoir pressure
5570 psi

Figure 7.1 Well schematic. Worked example 1.