- Title : Completion Hydraulics Handbook [ pdf ]
- Publish : Schlumberger - only for education reference
- Type Document : pdf
- Release : December 2000
- Total Page : 392 Page
- Size : 5.76 Mb
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Decrypted Contents
Chapter 4:
HYDRAULIC FORCES and HOOK-LOADS
There are many different types of packers, each with its own considerations regarding forces. This chapter discusses, in general terms, the more common types of retrievable packers and how tubing and hydraulic forces affect them.
Tubing run packers are generally classified into two categories:
Tubing run packers are generally classified into two categories:
- Single Grip Retrievable Packers
- Double Grip Retrievable Packers
Single Grip Retrievable Packers
Single grip retrievable packers are the simplest and most economical retrievable packers. These packers have one set of slips that anchor the packer to the casing and hold the packer from moving in one direction only. Single grip retrievable packers are further classified into three basic types:
Single grip retrievable packers are the simplest and most economical retrievable packers. These packers have one set of slips that anchor the packer to the casing and hold the packer from moving in one direction only. Single grip retrievable packers are further classified into three basic types:
- Non-Equalizing Tension Packer
- Non-Equalizing Compression Packer
- Equalizing Compression Packer
Non-Equalizing Tension Packer
The Model ‘SA-3’ retrievable packer is a typical example of a non-equalizing tension packer. The packer is set and packed off with tension pulled into it with the tubing string. It remains packed off so long as a tensile force is on the packer. Any force due to temperature or pressure which places compression on the packer will adversely affect the packer. As the name implies, this type of packer has no provision for equalizing differential pressure when releasing it. These packers usually incorporate a secondary shear release system activated by tubing tension.
The Model ‘SA-3’ retrievable packer is a typical example of a non-equalizing tension packer. The packer is set and packed off with tension pulled into it with the tubing string. It remains packed off so long as a tensile force is on the packer. Any force due to temperature or pressure which places compression on the packer will adversely affect the packer. As the name implies, this type of packer has no provision for equalizing differential pressure when releasing it. These packers usually incorporate a secondary shear release system activated by tubing tension.
Non-Equalizing Compression Packers
A typical compression packer of this type is the Model ‘CA-3’. The packer is set and packed off with tubing weight. A compression packer remains packed off as long as suitable compression is on the packer. Any force that works against this compression will tend to unset the packer. There is no provision for equalizing differential pressure across the tool.
A typical compression packer of this type is the Model ‘CA-3’. The packer is set and packed off with tubing weight. A compression packer remains packed off as long as suitable compression is on the packer. Any force that works against this compression will tend to unset the packer. There is no provision for equalizing differential pressure across the tool.
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