Tests in Berea sandstone cores have been carried out which simulate scale inhibitor treatments by the precipitation squeeze method. The studies have shown that squeezes with common phosphonate inhibitors last twice as long as squeezes using common polymer inhibitors in cores containing brines with low calcium content (1,000 ppm). However, an inhibitor new to the oilfield has been shown to have a squeeze life double that seen with phosphonate inhibitors.

This new inhibitor is a phosphorous containing oligomeric product. As such, its residual can be determined easily in the field. This product is as effective as phosphonate inhibitors in controlling calcium carbonate and sulfate scales. It is superior to most products in controlling barium sulfate scales. This product should have special utility in reservoirs containing low concentrations of calcium.

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