Method and system for obtaining core samples during the well-dri

Details Method and system for obtaining core samples during the well-dri Method and system for obtaining core samples during the well-dri

1997-07-23

2000-03-21

Neuder, William

Boring or penetrating the earth

Processes

Boring with specific fluid

175 66, 175206, E21B 2106

Patent

active

060391286

ABSTRACT:
A method and system for obtaining core samples using a coring fluid. During the drilling phase of hydrocarbon wells and the like, drilled with existing drilling systems, the bit that drills the well is driven by a string of rotating pipes and drilling mud is introduced in the rotating pipes. The drilling mud rises carrying with it the cuttings produced by the drill bit. Alternatively to the current operating method, the rotating pipes can be removed and a special piece of equipment called a core barrel is mounted thereon. The rotating pipes thus equipped for collection of the "core" are then lowered into the well. According to the present invention, when the rotating pipes are at the bottom of the hole, a sufficient volume of a colloidal, viscous coring or embedding fluid is introduced into the mud circuit to encapsulate a sample of the cuttings, for lifting to the surface and subsequent analysis. The fluid prevents the cuttings from being altered by the drilling mud. The present invention also discloses a novel arrangement of the drilling mud flow circuit for implementation of the method.

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