The packer isolates and aids in the control of producing fluids and pressures to protect the casing and other formations above or below the producing zone. All packers will attain one or more of the following objectives when they are functioning properly.
1. Isolate well fluids and pressures.
2. Keep gas mixed with liquids, by using gas energy for natural flow.
3. Separate producing zones, preventing fluid and pressure contamination.
4. Aid in forming the annular volume (casing/tubing/packer) required for gas lift or subsurface hydraulic pumping systems.
5. Limit well control to the tubing at the surface, for safety purposes.
6. Hold well servicing fluids (kill fluids, packer fluids) in casing annulus.
Once a tubing-packer system has been selected, designed, and installed in a well there are four modes of operation: shut-in, producing, injection, and treating. These operational modes with their respective temperature and pressure profiles have considerable impact on the
length and force changes on the tubing-to-packer connections.
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