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:
Jan. 25, 1983
Filed:
Dec. 23, 1980
Bobby J Hallmark, Fort Worth, TX (US);
Other;
Abstract
Invention permits possible recompletion and rejuvenation of older wells to produce from new zones where the original zone of production has become too depleted for further production. Discloses a method and apparatus for testing an earth formation through a well bore side wall which is covered by steel casing and cement. Includes the steps of establishing a fluid tight seal between the face of the casing and the interior of tester apparatus; providing a source of change in the fluid pressure within the apparatus causing a pressure change only when such a fluid tight seal does exist; releasing a firing mechanism responsive to such fluid pressure change to fire a casing perforating mechanism; perforating a hole through the casing with the perforating mechanism at a position within the fluid tight seal to establish sealed fluid communication between the earth formation and the interior of the apparatus; and testing the earth formation through said hole.