Patent ID: 11933137
Assignee: ARMOR TOOLS INTERNATIONL INC.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 12:
13. A method for pressure control using two of the apparatus of claim 1, comprising:
adding the first of the two apparatus, with a convex side of the disc oriented toward the bottom of the wellbore, to the bottom of a tubing string and injecting the tubing string into the wellbore;
filling the tubing string with a low-density fluid, and adding the second of the two apparatus, with the convex side of the disc oriented toward the bottom of the wellbore, to the tubing string into the wellbore;
injecting the tubing string a further pre-determined distance into the wellbore, adding high-density fluid into the tubing string above the uppermost of the two apparatus; and
with the tubing string in a desired position in the well, operating surface equipment to apply force onto one side of the uppermost apparatus sufficient to release the uppermost apparatus' releasable holding structure to thereby break the disc.