Method for obtaining cores from a producing well

Details Method for obtaining cores from a producing well Method for obtaining cores from a producing well

1991-08-30

1993-02-23

Neuder, William P.

Boring or penetrating the earth

Processes

Sampling of earth formations

175 81, 175248, E21B 706, E21B 2516

Patent

active

051881900

ABSTRACT:
Core samples are obtained through production wells by inserting a milling tool through the production tubing string on the distal end of coilable tubing to mill out a window in the well casing. The milling tool is deflected by a whipstock set in the casing at a predetermined point and encased in cement which, upon setting, is bored to form a pilot bore for the milling tool. A fluid-motor-driven core barrel is run into the well on the coilable tubing after the milling operation is complete and core drilling is carried out in an underbalanced condition by reducing wellbore pressure through gas lift so as to minimize core invasion by wellbore fluids, including spent core drilling fluids.

REFERENCES:
patent: 2324682 (1943-07-01), De Long
patent: 5103921 (1992-04-01), Zeer et al.

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