The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2012
Filed:
Mar. 02, 2011
Applicants:
William J. Darnell, Houston, TX (US);
Charles D. Wintill, Houston, TX (US);
Rodney W. Long, Cypress, TX (US);
Inventors:
William J. Darnell, Houston, TX (US);
Charles D. Wintill, Houston, TX (US);
Rodney W. Long, Cypress, TX (US);
Assignee:
PetroQuip Energy Services, LP, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 43/00 (2006.01); E21B 34/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
A formation saver sub or pump out sub incorporating an anti-surge feature. The sub includes a body, a mandrel, a piston (or an annulus fluid pressure chamber and a tubular pressure chamber), a sleeve, a spring, a releasable seat, and a plug. The plug and seat are released from the sub when one or more dogs releasably positioning the seat in the mandrel bore disengages from the seat due to a bleed off of fluid pressure in the well bore.