Halliburton Energy Services, Inc.

Benjamin Llywelyn Evans

Ludovic Delmar

Jean-Pierre Lassoie

Olivier Christophe Roche

Svein Ravndal

Adrien P C Henry

Adrien P Henry

A well tool apparatus comprises a control arrangement configured to control response of the downhole tool by varying downhole drilling fluid conditions. The control arrangement includes a valve piston longitudinally slidable in a generally tubular controller housing that is in operation substantially co-axial with the wellbore, to open or close a valve port to a fluid flow connection between the drill strings interior and the tool. A latch mechanism is configured to latch the valve piston in an activated mode and/or a deactivated mode. Unlatching of the valve piston can be effected by displacement thereof in a particular axial direction to a mode change position. A stay member is automatically displaceable in the particular actual direction under hydraulic actuation responsive to above-threshold drilling fluid conditions, to obstruct movement of the valve piston under hydraulic actuation to the mode change position. The stay member can include a lock piston carrying a ball locking mechanism for obstructing axial movement of the valve piston.

Remote hydraulic control of downhole tools

A method for obtaining a core sample from a wellbore using a coring tool is disclosed. The method includes providing an outer barrel in the wellbore. The wellbore and outer barrel are at least partially filled with a drilling fluid. The method further includes lowering an inner barrel partially into the drilling fluid and displacing the drilling fluid in the inner barrel with a coring fluid.

Method of filling a coring tool inner barrel with a coring fluid

An example system for receiving gas expelled from a core sample of a formation may include a tubular element. A core chamber may be disposed within the first tubular element. A gas and drilling fluid separator may be in fluid communication with the core chamber. The tubular element may be an inner barrel assembly of a core sample assembly that is disposed within a borehole. A core sample may be contained within the inner barrel assembly and may be retrieved at the surface. Gas may be expelled from the core sample as it is retrieved, and the gas and drilling fluid separator may separate the expelled gas from suspension with a drilling fluid for analysis.

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Uccle, Belgium

Benjamin Llywelyn Evans