Selective earth formation testing through well casing

Patent · Tue Jan 25 00:00:00 EST 1983

OSTI ID:6407382

Hallmark, B J

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.

• Assignee: EDB-83-064287
• Patent Number(s): US 4369654
• OSTI ID: 6407382
• Resource Relation: Patent File Date: Filed date 23 Dec 1980; Other Information: PAT-APPL-219865
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
GEOLOGIC FORMATIONS
TESTING
TOOLS
DESIGN
WELL CASINGS
ABANDONED WELLS
BOREHOLES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PRESSURE GRADIENTS
SEALING MATERIALS
CAVITIES
GEOLOGIC DEPOSITS
MATERIALS
MINERAL RESOURCES
RESOURCES
WELLS
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration