High pressure jet perforation system
AssigneeSchlumberger Technology Corporation
InventorCarolina Gonzalez Martinez
Life of this patent
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Abstract
A technique facilitates removal of excess sand during a jet perforating operation without requiring that the perforating string be pulled out of hole. A jet perforating tool is provided with at least one perforating nozzle for creating perforations in a well via high-pressure fluid. The jet perforating tool also comprises at least one wash nozzle oriented to direct fluid under pressure against a sand plug to break loose excess sand. A pair of seats and plug members may be used in the jet perforating tool to control the flow of pressurized fluid through the perforating jet nozzle and/or the wash nozzle.
Claims12
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.
A system for creating perforations, comprising:
- a jet perforating tool positionable in a wellbore having a primary internal flow passage, a lead end with a first seat along the primary internal flow passage, and a wash nozzle directing a fluid flow from the primary internal flow passage to an exterior of the jet perforating tool in a forward direction generally parallel to the primary internal flow passage, the jet perforating tool further comprising a perforating jet nozzle directing a fluid flow from the primary internal flow passage to an exterior of the jet perforating tool in a direction radial to the primary internal flow passage and a second seat disposed between the wash nozzle and the perforating jet nozzle, wherein the first seat is sized to sealingly engage a plug member which is configured to be flowed down along the primary internal flow passage and through the second seat.
Dependencies are inferred from the claim text.