Sealing means for lubricant chambers in down-hole drilling...

Details Sealing means for lubricant chambers in down-hole drilling... Sealing means for lubricant chambers in down-hole drilling...

E - Fixed Constructions

21

B

255/12

E21B 3/00 (2006.01) E21B 4/00 (2006.01)

Patent

CA 1257865

ABSTRACT This invention relates to improvements in the sealing arrangement for a bearing, or a combined bearing and gear-reduc- tion assembly, of a down-hole driven drilling apparatus. The bearing and gear-reduction means are disposed in a lubricant chamber sealed from the drilling mud. The pressure of the lubricant chamber is maintained higher than that of the drilling mud by means of a piston urged into the chamber by hydraulic pressure, optionally assisted by mechanical forces. All the dynamic seals are rotary face seals whose elements are made of a non-elastomeric wear resistant material. The piston is divided in two parts with a dynamic seal between it, one part being stationary with reference to the casing and one part being stationary with reference to the rotating driven mandrel.

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