Selective Straddle Acidizing, Water Shut-Off and Fracturing Operations

The Weatherford inflatable jet straddle packer (IJSP) system uses two IJP multi-set packers and an optional pickup unloader to seal the casing, liner, or screen below the tubing and provide a bore through the packer to access the treatment area. The IJSP is run with a nozzle sub between the inflatable packers, creating backpressure while pumping and inflating the packers to an inflation pressure determined by the rate and the size of the nozzles. A ball drop circulating sub can be run above the system to allow circulation while running in the well and for displacement of the treatment fluid to the tool. Upon completion of the treatment, when pumping has ceased, tension is applied to open the unloader to assist with the equalization of the pressure across the packers. The IJSP system can then be moved to another location in the well and re-set or brought to surface.

This system is recommended for applications in which the packer system runs through production tubing and sets in a larger-diameter casing, liner, or screen.