Circulated Degradable Material Assisted Diversion

摘要

Circulated degradable material assisted diversion (CMAD) methods for well treatment in completed wells are disclosed. A slurry of solid degradable material is circulated in the well with return of excess slurry, a plug of the degradable material is formed, a downhole operation is performed around the plug diverter, and the plug is then degraded for removal. Degradation triggers can be temperature or chemical reactants, with optional accelerators or retarders to provide the desired timing for plug removal. In multilayer formation CMAD fracturing, the plug isolates a completed fracture while additional layers are sequentially fractured and plugged, and then the plugs are removed for flowback from the fractured layers.