Drill string safety and kill valve

Details Drill string safety and kill valve Drill string safety and kill valve

1979-11-05

1981-09-29

Schwadron, Martin P.

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

13761419, 166322, 166323, 166325, 175242, E21B 4100

Patent

active

042917220

ABSTRACT:
A drill string safety and kill valve for a string of drill pipe used for drilling wells including a tubular valve body connectible in the drill pipe, a ball valve in the body mounted to rotate between open and closed positions for controlling flow through the body, a longitudinally movable tubular ball valve operator in the body connected with the ball valve, a spring biased flapper valve in the ball valve operator mounted to permit downward flow and to close responsive to upward flow for raising the ball valve operator to close the ball valve, a side port provided in the side of the ball valve positioned upwardly when the ball valve is closed for pumping drilling fluids downwardly into the bore of the closed ball valve, and a spring biased lower ball valve seat moved downwardly by downward flow of drilling fluid when the ball valve is closed to allow pumping into a well for killing the well after valve closure. During normal drilling operations drilling fluids are pumped downwardly through the open flapper and ball valves. A sudden upward pressure surge closes the flapper valve which in turn closes the ball valve. Heavier drilling fluid for killing the well may then be pumped downwardly through the flapper valve into and around the closed ball valve pushing the lower ball valve seat downwardly away from the ball valve and downwardly between the ball valve and lower seat to enter the formation being drilled.

REFERENCES:
patent: 2848053 (1958-08-01), Curry
patent: 3126908 (1964-03-01), Dickens
patent: 3200837 (1965-08-01), Brown
patent: 3886967 (1975-06-01), Nelson
patent: 3955624 (1976-05-01), Fredd et al.
patent: 3967647 (1976-07-01), Young
patent: 4009753 (1977-03-01), McGill et al.
patent: 4026362 (1977-05-01), Mott
patent: 4074761 (1978-02-01), Mott
patent: 4220176 (1980-09-01), Russell

Affiliated with

Also associated with

Rating

Drill string safety and kill valve does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Drill string safety and kill valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drill string safety and kill valve will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1229682