Permanent Production Packer Installations in Canadian Gas Wells
- G.A. Welsh (Dowell of Canada)
- Document ID
- Petroleum Society of Canada
- Journal of Canadian Petroleum Technology
- Publication Date
- January 1969
- Document Type
- Journal Paper
- 6 - 14
- 1969. Petroleum Society of Canada
- 2.1.1 Perforating, 2 Well Completion, 5.6.4 Drillstem/Well Testing, 4.2.3 Materials and Corrosion, 4.1.2 Separation and Treating, 4.1.5 Processing Equipment
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Permanent production packer installations have been widely used in Canadiangas wells. They also have been used, but to a lesser degree, in oil and waterwells. A permanent production packer virtually becomes a part of the casing andprovides a sound, reliable base on which a successful well completion may bebuilt. Although many types of installations have been used successfully, thispaper will describe only those most commonly used. As tubing movement must be amajor consideration in the design of permanent packer installations, this paperwill also discuss causes, effects and calculations for such movement.
PERMANENT TYPE PRODUCTION PACKERS have proved to be efficient and reliabletools for segregating fluids and pressures in Canadian gas wells. Most suchinstallations have been in wells that are particularly hot, high pressure orcorrosive, and in wells where more than one of these extreme conditionsexist.
Due in part to this variety of conditions -along with fluid, pressure andtemperature changes encountered during well treatment, and well owners'individual preferences -several different basic packer installations haveevolved.
As most of these installations have proved highly successful, it appearsuseful to describe in detail those most commonly used. To this end, differentpermanent packers and allied equipment will be shown and discussed.
This will be followed by diagrams and explanations of the nine most commonbasic installations. As a major consideration in almost all of these gasinstallations has been tubing movement, the causes, effects and calculationsfor same will be described. For the most part, all discussion will be confinedto installations in wells with a single gas zone. With the exception ofreference to hot oil and fluid injection strings, discussion will center onwells with single tubing strings.
PERMANENT PACKERS AND ALLIED EQUIPMENT
Permanent production packers may be set on either wire line or tubing. Ontubing, this may be achieved by mechanical or hydraulic means. Most packers areset on wire line for greater accuracy and speed and to minimize the possibilityof accidental presetting. Such packers fall into two categories top sealing andthrough sealing. Top Sealing packers provide a larger minimum bore (I.D.) forproduction or injection (Figure 1a).
Through Sealing packers allow for the addition of tailpipe to theseals on the tubing string. Also, on some through sealing installations,additional seal units maybe attached and the tubing allowed to travel. Thisminimizes or eliminates the possibility of parting at the surface (Figure1b).
Also available are permanent production packers with packer body extensionson the bottom, on which maybe be installed tailpipe or other equipment, or withpacker bore extensions on the bottom which provide additional sealing borelength and external protection to the seals from corrosive well fluids (Figures2a and 2b.
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