Boring or penetrating the earth – Automatic control – In response to drilling fluid circulation
Patent
1988-09-15
1990-03-06
Massie, Jerome W.
Boring or penetrating the earth
Automatic control
In response to drilling fluid circulation
175100, 166320, 137504, E21B 3410
Patent
active
049057758
ABSTRACT:
To divert sufficient fluid flow through an unsealed bearing section of a downhole drilling motor, a flow control apparatus is provided for insertion between the power section of the motor and the bottom of a drill bit which is to be turned by the motor. The flow control apparatus includes a variable flow channel having a selectable effective cross-sectional area preferably embodied by a valve. A selected effective cross-sectional area is chosen by a control mechanism, such as a snap ring or a spring used to control the position of a valve member of the valve in response to different flow rates of fluid pumped through the valve depending upon whether the drill bit is on-bottom or off-bottom. In one embodiment the apparatus is incorporated within the interior of a drill bit which has angled flow channels to direct flushing fluid flow to side wall locations where reaming occurs. Flow through these outlets is controlled by positioning of the valve member. The flow control apparatus is part of a borehole excavating apparatus which is a part of a system for drilling a borehole.
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Brett James F.
Warren Tommy M.
Winters Warren J.
Amoco Corporation
Brown Scott H.
Hook Fred E.
Massie Jerome W.
Melius Terry Lee
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