Method for placement of a scale inhibitor in a formation

Details Method for placement of a scale inhibitor in a formation Method for placement of a scale inhibitor in a formation

E - Fixed Constructions

21

B

E21B 41/02 (2006.01) C09K 8/528 (2006.01) E21B 37/06 (2006.01) E21B 43/14 (2006.01) E21B 43/25 (2006.01)

Patent

CA 2160258

A method for placement of a long life scale inhibitor into a formation where variable density scale inhibitors are utilized. A substantially low density non-reactive fluid is loaded into the intervals (20, 22, 24, 26) of the formation to be treated. Afterwards, a high density first stage scale inhibitor (16) is injected into the interval (20). Thereafter, a low density spacer fluid (18) is injected into the well (10). Next, a second stage high density scale inhibitor having a density lower than the first stage inhibitor is injected into me interval (22). Subsequently, a low density spacer (18) is injected into the well (10). Volume increments ace repeatedly injected with decreasing fluid densities until a desired zone has been treated. The entire treatment is then overflushed with an inert high density fluid. Use of this method allows even inhibitor distribution in intervals of a formation with permeability variations thereby preventing scale build-up.

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