Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent
1991-09-30
1993-06-08
Britts, Ramon S.
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
175215, 384 95, E21B 402
Patent
active
052170802
ABSTRACT:
An improved sealing system for a sealed bearing assembly used in earth drilling. The bearing assembly has a first tubular member, and a second tubular member telescopically received in the first tubular member. The second tubular member has an interior passage through which drilling fluids pass under pressure from on surface pumps. A clearance space is provided between the first tubular and the second tubular member defining a lubricant filled bearing chamber. The improvement is in the seal at a pump end of the bearing chamber which consists of a first floating piston, a second floating piston spaced from the first floating piston, and a fixed seal intermediate the first floating piston and the second floating piston. A first chamber is provided between the first floating piston and the fixed seal. The first chamber is filled with lubricant. A second chamber is provided between the fixed seal and the second floating piston. The chamber has a passage to external of the first tubular member. The differential in pressure between the first chamber and the second chamber is sealed by the fixed seal.
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Foote Dean
Wenzel Kenneth H.
Britts Ramon S.
Tsay Frank S.
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