Patent ID: 7793741

Claim:
A method comprising: charging at least a first vessel with a circulation fluid and a plurality of crush resistant metallic impactors during at least a portion of a first time period; pressurizing at least a second vessel during at least a portion of the first time period; and permitting at least a third vessel to inject a suspension of circulation fluid and a plurality of crush resistant metallic impactors into a flow region during at least a portion of the first time period; permitting circulation fluid to flow through the flow region at a first pressure; wherein pressurizing the at least a second vessel during at least a portion of the first time period comprises: pressurizing the at least a second vessel during at least a portion of the first time period to a second pressure that is greater than the first pressure; and permitting the at least a third vessel to inject a suspension of circulation fluid and a plurality of crush resistant metallic impactors into the flow region during at least a portion of the first time period comprises: permitting the at least a third vessel to inject a suspension of circulation fluid and a plurality of crush resistant metallic impactors into the flow region during at least a portion of the first time period so that the suspension of circulation fluid and a plurality of crush resistant metallic impactors is injected into the flow region at a third pressure that is greater than the first pressure.