Wells – Processes – Cleaning or unloading well
Patent
1983-03-25
1984-01-17
Novosad, Stephen J.
Wells
Processes
Cleaning or unloading well
134167C, 166 73, 166178, 166223, 239397, 239550, 239600, E21B 3700, E21B 3706
Patent
active
RE0314951
ABSTRACT:
A jet carrier assembly for cleaning well liners has a jet tool stabilized by a centralizer proximate to each of the tool's upper and lower ends. The jet tool is an elongate member having about 4 to 8 pairs of jet nozzles axially spaced therebetween, the axial spacing between alternate pairs being equal. The jet nozzles are spaced to provide a jet fluid track that covers any given point on the liner at least once but not more than twice when the member is lifted at a constant selected vertical speed and a constant selected rotational speed. The nozzles are mounted within adapters which are in turn detachably mounted to the elongate member. The adapters, which are provided in various sizes depending upon the diameter of the well liner, are interchangeable. The centralizers are capable of axial and rotational movement along mandrels attached to the upper and lower ends of the tool. The centralizers which are provided in varying sizes, depending upon well liner diameter, have a central bore which slidably engages the mandrel permitting the rotation of the centralizer to be isolated from the rotation of the jet tool. For any given diameter well liner, the adapters and centralizers are chosen to provide a jet nozzle to liner standoff distance of about 5 to 10 times the diameter of the nozzle orifice.
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Down Hole Services, Inc., Brochure, "Hydraulic Perforation Cleaning (HPC) Service", 6-79, pp. 1-3, 5-79, 9 and 9.1.
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