Pressure compensation system for a steerable rotary drilling...

Details Pressure compensation system for a steerable rotary drilling... Pressure compensation system for a steerable rotary drilling...

E - Fixed Constructions

21

B

E21B 7/04 (2006.01) E21B 7/06 (2006.01)

Patent

CA 2410716

In a drilling apparatus of the type comprising a housing, a proximal seal, a distal seal, a fluid chamber defined by an interior of the housing between the proximal seal and the distal seal, the fluid chamber containing a lubricating fluid having a fluid chamber pressure, a pressure compensation system for compensating for the effects of an ambient pressure exerted on an exterior of the apparatus. The pressure compensation system includes a pressure port in the housing so that the ambient pressure can be communicated to the fluid chamber and a supplementary pressure source for exerting a supplementary pressure on the lubricating fluid contained in the fluid chamber so that the fluid chamber pressure is maintained higher than the ambient pressure.

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