fax 01-972-952-9435. AbstractReactive element packers (REPs), sometimes referred to as swelling packers or self-energizing packers, offer a simple solution for multiple-zone open-hole completions. These packers are run into the well and begin to swell when they come into contact with various wellbore fluids, with the typical fluids of choice being water-or oil-based fluids. As the packers swell, they seal off the annulus between the liner/casing and the open-hole wellbore to provide isolation between zones with different pressures, or to simply shut off flow in the annulus and prevent migration of fines along the wellbore.As REP technology makes its mark in zonal isolation, application of the technology for fracturing and well stimulation is beginning to be explored. REPs used for frac'ing and stimulation offer a simplified method of breaking the desired zone into smaller sections without adding the cost and complexity that may result from using the traditional cement and perforating methods. This paper will discuss this new application for REPs. Functionality will be discussed, as will possible advantages and disadvantages of using the REP for well stimulation and fracturing. Key packer parameters will be reviewed to help demystify a seemingly infinite number of sizing possibilities. Then, initial testing to verify and validate the packer for this application will be discussed. Finally, this extensive test data will then be shown to validate a complex mathematical prediction model used to determine the REP's capabilities.