Boring or penetrating the earth – Boring without earth removal – Combined with earth removal
Patent
1993-01-22
1993-10-19
Bui, Thuy M.
Boring or penetrating the earth
Boring without earth removal
Combined with earth removal
175 67, 175424, E21B 1000
Patent
active
052537188
ABSTRACT:
A wellbore jetting tool has a novel packer assembly which enables the tool to be raised, lowered and rotated while operating, a nozzle which automatically raises to extend radially from the tool, and a flow system for returning slurry in an inner tube of cross section. The packer assembly is hydraulically actuated, and traps fluid to provide lubrication, which enables raising, lowering and rotation during operation while substantially maintaining the necessary sealing. The nozzle is raised by a torque generated by vanes disposed within the nozzle head reacting to fluid flow, and also by thrust from the cutting jet. The nozzle discharges this jet at an angle, thus biasing the nozzle appropriately. A breakaway feature allows abandonment of the nozzle if it jams when it is extended, ensuring that the pipestring may always be retrieved. The return of slurry through its own conduit reduces chances of a particle lodging in the slurry return line.
REFERENCES:
patent: 3030086 (1962-04-01), Donaldson et al.
patent: 3142339 (1964-07-01), Brown et al.
patent: 4027407 (1977-06-01), Kiss
patent: 4134619 (1979-01-01), Bunnelle
patent: 4140346 (1979-02-01), Barthel
patent: 4534427 (1985-08-01), Wang et al.
patent: 4919204 (1990-04-01), Baker et al.
Bui Thuy M.
Litman Richard C.
Seacoast Services, Inc.
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