Page 138 - Well Control for Completions and Interventions

130 Well Control for Completions and Interventions

Figure 3.35 A wireline retrievable safety valve. (Image courtesy of Jonathan
Bellarby).

retrievable valves, the control line is connected to a ported wireline nip-
ple that is run as part of the completion tubing. Hydraulic fluid passes
through a port into the tubing where it is trapped between two sets of
seals on the body of the wireline retrievable valve (Fig. 3.35).
It then passes through a port in the valve body to reach the piston.
Wireline set safety valves can be set inside the body of a tubing
retrievable valve, should the tubing retrievable valve fail an integrity test.
A wireline intervention is required to prepare the tubing retrievable valve
before the wireline set valve can be installed.

3.19.5 Installation of surface controlled downhole
safety valves
A surface controlled downhole safety valve is a safety critical component
and as such, particular care needs to be taken when installing the valve.
Points to note are: