Differential valve

Details Differential valve Differential valve

E - Fixed Constructions

21

B

166/41

E21B 33/10 (2006.01) E21B 21/10 (2006.01) E21B 34/06 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1057651

ABSTRACT OF THE DISCLOSURE The invention is a differential valve apparatus principally for use in treating subterranean wells, usually in connection with cementing a string of casing into a well bore. The apparatus, at or near the low end of the casing, has a pressure actuated slidable piston which rises as liquid is encountered in the well bore opening parts for admitting liquid into the casing until the pressure from liquid in the casing reaches a predetermined ratio with respect to the pressure in the well bore annulus. Means are provided for locking the piston in its closed position after the casing string is in place in the well, permitting the use of the apparatus as a conventional cementing valve apparatus.

281950

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1062429