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This article discusses experimental and field case studies of a remedial treatment technique to eliminate fracture proppant production. This process uses a low-viscosity consolidating agent, which is placed into the propped fractures using a pressure-pulsing tool conveyed by conventional or coiled tubing. The treatment alters loosely packed proppant within the fractures and formation sand close to the wellbore, changing it into a cohesive, consolidated, highly permeable pack. The process’s efficiency makes remediation economically feasible for wells with marginal reserves.
Many fracture-stimulated wells are subjected to curtailed production rates because of sustained proppant flowback problems. In fact, many wells are shut in because they are uneconomical to produce at rates that are lowered by produced proppant covering perforations. Produced proppant often damages downhole pumps and surface equipment, and often results in costly downtime.
Low production rates directly affect the operator’s potential revenue. Frequent workovers for cleanup or sand removal also are factors...
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