Prolonged chemical inhibition is the desired outcome from placing a solid inhibitor in a formation during the fracturing process. Traditionally liquid inhibitors applied through a squeeze have provided inhibition for up to one year and sometimes longer. Deepwater operators, especially, desire longer inhibition periods. This paper reports on new fracture compatible chemistry that has been applied on over five hundred wells for the inhibition of mineral scale. It also reports on similar products for the inhibition of paraffin and asphaltene. These applications have been in deepwater, tight gas and coal bed methane formations. The longest documented treatment has been in the ground for over three and a half years. The highest cumulative water production with acceptable scale inhibitor residuals has been over 1,000,000 bbls of water.

Placing a solid chemical inhibitor into the formation via the fracturing process requires a product that is compatible with the fracturing fluid, does not adversely affect conductivity and provides long term inhibition through the controlled release of the inhibitor into the produced fluid. The solid inhibitor is added to the fracturing proppant. Primarily this is a mass-balance process by which a finite amount of inhibitor desorbs over time. The goal is to maximize the inhibitor loading and minimize the chemical release rate without negatively impacting the stimulation.

In the treated wells, inorganic and organic deposition has been arrested for extended periods when compared to alternative liquid addition applications. This is a direct result of the placement of the inhibitor in the formation during the fracturing process. All wells have shown inhibition, as measured by produced fluid sample analyses.

All operators with deposition potential must undertake significant remedial intervention measures. This new chemical technology extends the life of a chemical inhibitor placement beyond traditional expectations. The advancement of this technology has reduced deposition-related failures and reduced well intervention costs.

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