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Multi Set
PRODUCTION INJECTION PACKER
 Introduction
The Inflatable Multi-Set Production-Injection Packer is used for isolating zones in open-hole or in casing. The tool is re-settable and may be used for testing, treating, production, or injection of several zones with each trip into the well. This tool is designed for long-term downhole production or injection applications.
The Inflatable Multi-Set Production-Injection Packer may be used in vertical, deviated, or horizontal wells. No rotation is required to set the packer, however right-hand rotation is required to unset the packer.
There are several options available for re-setting multi-set packers.
These include:
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Re-set Darts along with a perforated plug catcher are used when pumping or testing must take place through the tool.
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An expendable ball may be used.
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A standing valve may be used.
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A Wireline plug may be used.
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A solid Pumpout plug or bull plug may be used when no pumping or testing through the packer is required.
Inflatable packers elements for these tools are 1.67 m. (66 Inches) in length. High strength aircraft cable is used to provide good expansion characteristics in washed out or irregular well bores. Cable reinforcement allows these inflatable packer elements to return very close to the original run-in diameter while providing high differential pressure capabilities. The Packer elements are designed in such a way that bulging due to high differential pressure is less likely to occur. Due to superior bonding between the cable and rubber these elements lose less rubber down hole.
Applications
Water Shut-off
Multi-Set packers may be used for short-term or long-term production to block water encroachment zones in a well. As the life of a well increases, water coning may occur. Also, water production may start occurring from fractures or channels. Inflatable packers provide an effective seal in open hole or in casing, to block this unwanted water production.
Production
Multi-Set Inflatable Packers are also very effective for production applications. The packer serves two purposes when used for these applications. Firstly, the inflatable packer element provides a very effective seal in open hole or in casing. Secondly, the element anchors solidly in open hole or in casing, to prevent tubing rotation or reciprocation at the tool.
Injection
Multi-Set Inflatable Packers may be used for injection of fluids in disposal wells. A large internal bore is provided through the tool. For long term disposal applications it is very important that materials used in manufacturing these tools, are able to resist highly corrosive environments typically associated with disposal wells.
Testing
Multi-Set Inflatable Packers may be used for testing zones in open hole or in casing. Zones may be isolated to determine oil, gas, or water production from certain sections. Testing of each zone will determine which fluid is produced from that section. Also, testing will determine flow rates the zone. Electronic Pressure-Temperature Recorders as well as Shut-In Tools, may be used with the system to provide additional subsurface data from zones being tested.
Treating
Multi-Set Inflatable Packers may be used for treating zones in open hole or in casing. Typical treatments performed through the tool would be fracturing, acidizing, polymer injection for water shut-off, and acid washes.
For treating applications, a circulating valve is used above the tool. This valve is opened to allow treatment fluid to be pumped from surface, to the tool. Once the treatment fluid is spotted to the tool, the circulating valve is closed, and treatment fluid is then injected to the zone located below the packer.
Squeeze Cementing
Multi-Set Inflatable Packers may be used for squeeze cementing zones in open hole or in casing. These packers provide greater clearance for running tools into a well where there are restrictions such as casing patches. In addition, the long seal section provided with an inflatable element is more effective in older wells where casing may be partially corroded. These packers are particularly effective for squeeze cementing required to abandon old wells.
For squeeze cementing applications, a circulating valve is used above the tool. This valve is opened to allow cement to be circulated from surface, to the tool. Once the cement is spotted at the tool, the circulating valve is closed, and cement is then squeezed into the zone located below the packer.
Pressure Testing Casing Patches
Multi-Set Inflatable Packers are very effective for testing casing patches. Run-in diameter is reduced when a casing patch is set. An inflatable packer is designed with a reduced Outer Diameter (O.D.), which makes it possible to pass through a casing patch.
For testing a casing patch, the single set inflatable packer is normally set directly below the patch. After the packer has been set, pressure is applied to the annulus above the packer.
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