Diversion by combining dissolvable and degradable particles and fibers

摘要

In downhole treatments in the oilfield, ball sealers seated in perforations may not fully seal and may leak fluid through gaps and asperities between the balls and the perforations. A method is given for improving the sealing of ball sealers in perforations by adding a sealing agent that forms a plug in the gaps and severely restricts or eliminates fluid flow. The sealing agent is preferably degradable or soluble, malleable fibers slightly larger than the gaps. Optionally, the particles may be non-degradable, rigid, of different shapes, and smaller than the gaps but able to bridge them. Mixtures of sealing agents may be used. The sealing agent may be added with the ball sealers, after the ball sealers, or both.

主权项

1. A method of using a fluid within a subterranean formation, comprising:
forming a fluid comprising fibers and particles; introducing perforation sealers into the fluid; introducing the fluid into the subterranean formation; forming a seal in a perforation in the formation; and allowing the fibers or particles or both to degrade, wherein the perforation sealers are separate from the fibers and the particles.