Wells – Processes – Cleaning or unloading well
Patent
1986-09-30
1988-05-31
Novosad, Stephen J.
Wells
Processes
Cleaning or unloading well
166173, 166241, 1510412, E21B 3700
Patent
active
047474521
ABSTRACT:
Method and apparatus for cleaning out a cased or uncased wellbore (particularly a high angle wellbore) prior to running a(nother) string of casing, a logging tool, or the like, into the hole. A stiff-bristled scouring brush is run in the hole on the leading end of a drill string. The brush is rotated as it is advanced through the portion to be cleaned to enhance dislodgement of caked on cuttings, drilling mud, and the like. Drilling fluid is reverse-circulated down the casing to entrain the dislodged material and carry it uphole in the high-velocity stream inside the drill string. A centering dolly keeps the apparatus positioned in the wellbore and keeps the weight of the drill string from riding on the brush.
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Bagnell David J.
Conoco Inc.
Novosad Stephen J.
Thomson Richard K.
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