Single Set - Pull Release
Inflatable Production Injection Packer
The Inflatable Single Set Production-Injection Packer is used for isolating zones in open-hole or in casing. The tool is retrievable and may be used for testing, treating, production, or injection. The Single Set, Pull Release Production-Injection Packer may be used in vertical or deviated wells.
Inflatable packers elements for this tool 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, as well as to provide high differential pressure capabilities. Cable reinforcement allows these inflatable packer elements to return very close to the original run-in diameter. In addition, these elements are less likely to lose rubber down hole because superior bonding occurs between the rubber and cable.
Features & Benefits
- Inflatable Packer Elements provide greater clearance through restrictions in a well.
- Tool requires no rotation for setting or releasing the packer.
- The system does not depend on a poppet valve to maintain pressure in the packer element. A sliding sleeve is mechanically shifted to maintain inflation pressure in the packer.
- A cable-reinforced packer element provides superior bonding of rubber to cable, and therefore less rubber is likely to be lost downhole.
- The system allows pressure to be fully equalized across the packer element prior to unsetting the packer. This minimizes packer element damage.
Single-Set packers may be used for 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.
Single 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 reciprocating or rotational movement at the tool.
For production applications, flow of oil or gas may occur from below the tool. A pumpout sub enables the flow passage through the tool to be opened for production, after the packer has been set. Alternatively, flow of oil or gas may take place from the production zone above the packer. A circulating valve (hydraulic, rotational type, or impact plug type) enables the flow passage above the tool to be opened, after the packer has been set.
Single Set Inflatable Packers may be used for injection of fluids in disposal wells. A large internal bore, equivalent to the running string, 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.
For disposal applications, fluid is normally injected to the zone located below the tool. A pumpout sub enables the injection passage through the tool to be opened for injection, after the packer has been set.
Single 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.
For testing applications, flow of well fluids may take place from the zone located above the packer. It is recommended that a rotational circulating valve be used directly above the tool. After the packer has been set, this valve may be rotated to open the flow ports. Once the required information from that zone is obtained, the valve may be rotated to close the flow ports.
Testing may then take place from the zone located below the tool. A pumpout sub enables the flow passage through the tool to be opened for testing.
Single Set Inflatable Packers may be used for treating zones in open hole or in casing. A large internal bore equivalent to the running string, is provided through the tool. This large bore minimizes frictional effects and does not provide restrictions for treatment at high pump rates.
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.
Single 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.
Single Set Inflatable Packers may be used as Bridge Plugs in a well, to isolate oil-water or gas- water contacts. These packers provide effective isolation in open hole or in casing. The long seal section provides additional assurance that good isolation will be provided where fractures or channels are present.
For bridge plug applications, a bull plug is typically used below the tool. Also, an on-off seal assembly is used directly above the tool. Once the packer has been set, manipulation of the work string allows tubing to be disconnected from the tool. In horizontal wells, a hydraulic disconnect unit is typically used. Additional pressure applied after setting the packer, disconnects the tubing string from the packer.
PRESSURE TESTING CASING PATCHES
Single 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.
Prior to running the Single Set Pull Release Tool into the well, a decision must be made whether to run a pumpout sub, ball shear assembly, or a bull plug, at the bottom of the tool.
A pumpout sub will not allow tubing to fill as the tool is run into the well. Shear Pins are used in this sub and these may be set at a pre-determined value based on accessory tools used, and downhole operating conditions. A pumpout sub is normally used in highly deviated or horizontal wells.
A Ball Shear Assembly allows tubing to fill as the tool is run into the well. Also, fluids may be circulated down the tubing before dropping the ball from surface.
A Bull Plug is typically used for bridge plug applications.
To set the Single Set, Pull Release Packer
- Apply pressure in tubing and hold pressure for a period of time in order to allow inflatable packer elements to fully inflate. It is recommended that pressure be held for a minimum time of 10 minutes.
- Release tubing pressure, and set a minimum of 2,200 DaN (5,000 Pounds) on the tool, to ensure the packer is set. Maintain this weight for a minimum period of five minutes, and then proceed with subsequent operations.
To Unset The Single Set, Pull Release Packer
- Apply a straight upward pull to the tool, in order to shear the screws. Each Shear Screw is rated for 2,200 DaN (5,000 Pounds). Once the screws are sheared, wait a minimum period of five minutes to allow the inflatable packer element to fully deflate.
|Element O.D.||Minimum Tool I.D.||Element Seal Length||Thread
|3.12||79||0.75||19||51||1.29||2 3/8" EUE|
|3.50||89||1.25||31||51||1.29||2 3/8" EUE|
|4.25||108||2.00||50||48||1.22||2 3/8" EUE|
|5.50||140||2.50||63||49||1.24||2 3/8" EUE
2 7/8" EUE
|6.75||171||2.50||63||49||1.24||2 7/8" EUE
3 1/2" EUE
|7.50||191||3.50||89||48||1.22||3 1/2" EUE|
|9.38||238||4.50||114||47||1.19||3 1/2" EUE|