E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/3
E21B 10/02 (2006.01) E21B 25/00 (2006.01)
Patent
CA 1253137
AN IMPROVED HYDRAULIC LIFT INNER BARREL IN A DRILL STRING CORING TOOL ABSTRACT OF THE DISCLOSURE An axial bore is defined throughout the hydraulic lift inner barrel. This axial bore is communicated with the interior of the inner tube thereby allowing the interior of the inner tube to be flushed prior to initiation of the coring operation. When the coring operation is begun, flow of drilling fluid to the interior of the inner tube is prevented by allowing a ball dropped within the drill string to seat within a plug through which the communicating axial bore is defined. Once the flow of drilling fluid to the interior of the inner tube is stopped, the coring operation can begin. After the coring operation is completed, a second ball is dropped and allowed to seat within an inner mandrel through which the axial bore of the coring tool is also defined. Once the axial bore of the inner mandrel is closed, drilling fluid is forced into an expansion chamber within a telescopic piston disposed circumferentially outside of the inner mandrel. The piston is connected to the inner tube. Diversion of drilling fluid into the expansion chamber causes the piston to be longitudinally displaced upward with respect to the inner mandrel, and hence with respect to the outer tube of the drill string. The inner tube is thus similarly lifted within the drill string, thereby activating core catchers or any other downhole mechanism coupled directly or indirectly to the inner tube.
506362
Davis J. Stanley
Knighton Kelly
Radford Steven R.
Eastman Christensen Company
Gowling Lafleur Henderson Llp
LandOfFree
Hydraulic lift inner barrel in a drill string coring tool does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic lift inner barrel in a drill string coring tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic lift inner barrel in a drill string coring tool will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1220965