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RITTSRe-Settable Inflate Test & Treat System

World Oil Tools Inc. is pleased to introduce our newly developed Re-Settable Inflate Test and Treat System (RITTS). The RITTS is designed for treating, testing, or injecting of single or multiple intervals  in a well-bore without the requirement of tripping between operations. The system can be operated via a single packer or a straddle packer  configuration. Full bore capabilities permit maximum pumping rates with reduced horsepower requirements.

Results: Less Rig Time…. Less Horsepower…. Less Cost!

The Inflatable Multi-Set Production-Injection Packer is used for isolating zones in open-hole or in casing. 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 or release the packer.

Inflatable packer elements for this 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

TESTING Re-Settable Inflate Test and Treat System 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.

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.

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.

Operational Sequence

As the RITTS tool is being run into the hole the tool auto-fills due to the large unrestricted bore through the tool which also permits circulation through the tool. Run in position ensures that the packer element remains equalized preventing premature inflation of the packer element. During the inflation sequence a reset dart or ball is launched from surface and pumped onto the seat. Fluid is then blocked to the annulus and through the packer I.D. Fluid is then diverted through concentric passages to the inflation channels of the packer element. It is then permissible to increase pressure in even increments allowing the packer element to fully inflate properly. Once the desired differential pressure is reached within the element pressure must be held for 10 minutes to allow the packer element to fully square off.

During the inflation pressure lock-in sequence weight is slacked off onto the tool by shifting the lug mandrel blocks the inflation channels trapping the pressure in the element. Shifting the lug mandrel also blocks ports from the I.D. of the tool to the annulus.

Once packer seat is verified tubing pressure can be increased to  the pre-determined pressure to shear the ball seat or the reset dart.

In the case of the re-set dart the dart shears allowing the collets to collapse and pass fully through the tool landing in the dart sub catcher on the bottom of the tool. Fluid is then able to flow through the large unrestricted bore of the tool to below the packer.

Once testing or treating has been finished weight is picked up off the string to begin the deflation sequence. The packer element inflation channels and annulus ports are opened allowing the packer to equalize and deflate close to its original run-in diameter. The tool is now back to its original run-in position ready to be moved to another  interval. Additional darts may be pumped from surface providing virtually unlimited setting in one trip into the well.

Running Procedures

Setting the Multi-Set Packer

  • Run in hole to setting depth at moderate speed. Avoid any sudden stops.
  • Take additional care in open hole.
  • On depth, establish up weights and down weights. The pipe may be circulated or filled, as required.
  • Insert the re-set dart into the string. Circulate to depth at 2 bbls./min. and reducing to ¼ bbl./min when within 3-5 bbls of the tool.
  • Apply 1200 PSI differential pressure at the packer to inflat the element, and hold pressure for 5 minutes.
  • Slack off 5000 pounds weight on the tool to shift the inflate mandrel closed and to check packer setting. Once packer setting is confirmed, pressure may be applied in the annulus to check for casing leaks.
  • If pressure testing must be performed through the drillstring or tubing, apply pressure of 1800 PSI in the string to shear out the re-set dart. Note three shears screws are required in the re-set  dart (each shear screw is rated at 600 PSI). The re-set dart will land into the plug catcher sub run below the packer.
  • Proceed with pressure testing.

Unsetting and Re-setting the Packer

  • To unset the packer, apply an upward pull of 2000 to 5000 pounds to the tool. Wait 15 minutes to allow the packer to deflate.
  • Position the packer at the next setting depth.
  • Insert the re-set dart into the string. Circulate to depth at 2 bbls./min. and reducing to ¼ bbl./min when within 3-5 bbls of the tool.
  • Apply 1200 PSI differential pressure at the packer to inflate the element, and hold pressure for 5 minutes.
  • Slack off 5000 pounds weight on the tool to shift the inflate mandrel closed and to check packer setting. Once packer setting  is confirmed, pressure may be applied in the annulus to check for casing leaks.
  • If pressure testing must be performed through the drillstring or tubing, apply pressure of 1800 PSI in the string to shear out the re-set dart. Note three shears screws are required in the re-set dart (each shear screw is rated at 600 PSI). The re-set dart will land into the plug catcher sub run below the packer.
  • Proceed with pressure testing.

Retrieving the Packer

  • To unset the packer, apply an upward pull of 2000 to 5000 pounds to the tool. Wait 15 minutes to allow the packer to deflate.
  • Pull out of the hole.