Well drilling apparatus

Details Well drilling apparatus Well drilling apparatus

1975-01-31

1976-12-14

Purser, Ernest R.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

137857, 166325, 166326, 175234, 175243, 175323, 175340, E21B 312, F16K 1518

Patent

active

039970094

ABSTRACT:
Apparatus is disclosed wherein a tubular body connectible in a drill string and having a float valve arranged therein to normally close the string, as the string is lowered into a well bore, is provided with a plurality of ports connecting its bore above the float valve with its exterior, and valve means for movement from a position normally closing to a position opening the ports when the exterior fluid pressure exceeds the fluid pressure in the bore above the float valve by a predetermined amount.

REFERENCES:
patent: 2293259 (1942-08-01), Johnson
patent: 2740481 (1956-04-01), Arterbury et al.
patent: 2858838 (1958-11-01), Scaramucci
patent: 2944794 (1960-07-01), Myers
patent: 2973006 (1961-02-01), Nelson
patent: 3205955 (1965-09-01), Whittle
patent: 3307571 (1967-03-01), Smith
patent: 3409078 (1968-11-01), Knox et al.
patent: 3461962 (1969-08-01), Harrington
patent: 3465595 (1969-09-01), Tansony
patent: 3566964 (1971-03-01), Livingston
patent: 3667557 (1972-06-01), Todd et al.
patent: 3703213 (1972-11-01), Kammerer

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1340149