Wells – Processes – Cleaning or unloading well
Patent
1994-05-18
1995-09-05
Dang, Hoang C.
Wells
Processes
Cleaning or unloading well
166105, 166312, E21B 2100
Patent
active
054472008
ABSTRACT:
A device to be connected to the lower end of a tubing string for removing sand or other debris from oil producing formations below a surface, the device comprising a combination of a thrust and rotational bearing assembly, a rotationally driven downhole pump comprising a rotor and a stator to provide hydraulic energy to lift fluid to the surface, a transfer chamber secured to the pump providing fluid communication between the pump and the tubing string to direct fluid from the pump to enter the string, a nose section secured to the pump rotor and constructed so that sand is mixed with wellbore fluid, a guide to take the mixture to the pump and an anti-rotation device secured to the pump constructed so as to prevent rotation of the pump stator while allowing axial movement of the pump.
REFERENCES:
patent: 3249054 (1966-05-01), Hill
patent: 4091631 (1978-05-01), Cherrington
patent: 4671359 (1987-06-01), Renfro
patent: 4744426 (1988-05-01), Reed
patent: 4940092 (1990-07-01), Ferguson et al.
patent: 5086842 (1992-02-01), Cholet
patent: 5158140 (1992-10-01), Ferry
patent: 5230388 (1993-07-01), Cherrington
Dedora Garth
Wawrzynowski Michael
Wilkin James F.
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