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:
Jul. 13, 2010
Filed:
Jul. 25, 2008
Terizhandur S. Ramakrishnan, Boxborough, MA (US);
Nikita V. Chugunov, Arlington, MA (US);
Andrew Duguid, Moon Township, PA (US);
John Tombari, Spring, TX (US);
Terizhandur S. Ramakrishnan, Boxborough, MA (US);
Nikita V. Chugunov, Arlington, MA (US);
Andrew Duguid, Moon Township, PA (US);
John Tombari, Spring, TX (US);
Schlumberger Technology Corporation, Cambridge, MA (US);
Abstract
The permeability of the cement annulus surrounding a casing is measured by locating a tool inside the casing, placing a probe of the tool in hydraulic contact with the cement annulus, measuring the change of pressure in the probe over time, where the change in pressure over time is a function of among other things, the initial probe pressure, the formation pressure, and the permeability, and using the measured change over time to determine an estimated permeability. By drilling into the cement and making additional measurements of the change of pressure in the probe over time, a radial profile of the cement permeability can be generated.