Patent ID: 8985209
Filing Date: 2015-03-24
Classification: E21B,Y10T

Abstract:
1. A method for creating sequential perforations along a wellbore with high-pressure jets, comprising: forming a first set of perforations in a wellbore with a jet perforating tool; creating a sand plug in the wellbore; removing excess sand from the sand plug by directing a first ball to a first ball seat at a lead end of the jet perforating tool discharging fluid through wash nozzles to loosen the excess sand; and reverse circulating the first ball and the excess sand; directing a second ball of larger diameter than the first ball to a second ball seat located to segregate the wash nozzles; and applying pressurized fluid against the second ball such that fluid is discharged from perforating jet nozzles to form a second set of perforations.