Importance

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Abstract

An injection well has become plugged with an accumulation of undesirable material that is causing the wellhead pressure required to effect a selected minimum flow rate of injection fluid into the formation to have increased to a maximum value. The method of this invention provides a process for treating the plugged formation to remove the accumulated undesirable material. The process requires a plurality of treatment cycles, and in each cycle injection fluid flows into the wellhead for a first time interval while injecting treatment chemical into the flowing injection fluid during a second time interval, with the first time interval being much longer than the second time interval. The well is acidized after a multiplicity of cycles and returned to operation.

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First Claim