Page 124 - Well Control for Completions and Interventions

116 Well Control for Completions and Interventions

Figure 3.23 Permanent releasable packers ready for deployment in an intelligent
completion. Note the various feed-through conduits serving hydraulic and instru-
ment cables.

commonplace. Intelligent systems are often used in multiple zone, single
string completions. This has led to the development of the “Permanent
c
Retrievable” packer—sometimes called “Perma-Trieve.” A permanent
retrievable packer is usually run with the completion tubing, then set
hydraulically or hydrostatically. Once set, these packers have high load
and pressure retention capability, on a par with many permanent packers
(Fig. 3.23).
Permanent releasable packers are pulled with the completion tubing,
but first need to be released, usually by some form of mechanical manipu-
lation; normally cutting or punching the inner mandrel. Well-designed
permanent/retrievable packers have many features in common:
• Moderate (variable) setting pressure to reduce tubing stretch while setting.
This also reduces residual tension in the tubing once the packer is set.
• No mandrel movement during setting, allowing the stacking of a
number of packers in a multiple zone completion.
• Multiple feed through for control line by-pass in intelligent completions.
• Simple and reliable release mechanism.

3.10.4 Multistring packers
Dual and triple string completions require single, dual, and triple string
packers to maintain separation between zones (Fig. 3.24).
Dual and triple string packers are usually hydraulically set retrievable
packers. They can be configured to set with the application of pressure to
either string.

c
Perma-Trieve is a registered trademark of Halliburton.