Well drilling assembly

Details Well drilling assembly Well drilling assembly

1990-04-30

1991-12-03

Dang, Hoang C.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

175324, 384453, 384480, E21B 402

Patent

active

050692984

ABSTRACT:
A well drilling assembly including a drill bit projecting beyond the bottom of a hollow casing at the bottom of the hole. A fluid motor mounted in the casing has a rotary shaft to rotate the drill bit. The lower end of the rotary shaft is hollow to provide a central flow passage therein, and has an outer pressure diameter less than the inner diameter of said casing to provide an outer pressure passage therealong. Bearings are mounted in the outer passage to support the shaft against radial and axial displacement, and are engulfed in a body of lubricant confined between upper and lower floating seals which limit flow of drilling mud into the lubricant and flow of lubricant from the body into the drilling mud. A labyrinth provides a rotating orifice in the outer passage below the lower seals to maintain a pressure differential between the exterior of said drill bit and the lower seals.

REFERENCES:
patent: 1722489 (1929-07-01), Bott
patent: 3971450 (1976-07-01), Fox
patent: 4019591 (1977-04-01), Fox
patent: 4256189 (1981-03-01), Fox et al.
patent: 4260032 (1981-04-01), Fox
patent: 4260167 (1981-04-01), Fox
patent: 4284149 (1981-08-01), Fox
patent: 4308927 (1982-01-01), Fox
patent: 4324299 (1982-04-01), Nagel
patent: 4361194 (1982-11-01), Chow et al.
patent: 4548283 (1985-10-01), Young
patent: 4593774 (1986-06-01), Lingafelter
patent: 4683964 (1987-08-01), Wenzel

Affiliated with

Also associated with

Rating

Well drilling assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Well drilling assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Well drilling assembly will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1692488