Odfjell Technology Invest Ltd

Smith International, Inc.

Halliburton Manufacturing and Services Limited

Mcgarian Tdc Limited

Global Shieldtech Ltd

Mcgarian, Bruce

Bruce Mcgarian

Intelligent Well Controls Limited

Ian Alexander Gillies

Rory McCrae Tulloch

William Brown-Kerr

Neil Andrew Moir

Wayne Biart

A downhole tool, comprising: an inner body, having first and second connections in a drill string to convey fluid from immediately upper to immediately lower components. The inner body defines a flow bore which communicates between the first and second connections. An outer body disposed around at least part of the inner body is axially movable with respect to the inner body, in a direction which is parallel or substantially parallel with a longitudinal axis of the tool, such that introduction of pressurised fluid into pressure chambers tends to drive the outer body axially with respect to the inner body. The tool further comprises a component which is activated or operated by axial movement of the outer body with respect to the inner body.

Downhole tool

A tool comprises a tool body having a bore, a secondary chamber within the tool body, a flow port between the bore and the secondary chamber; a cover component within the bore moveable between at least two positions along the length of the bore, and a control arrangement connected to control movement of the cover component within the bore. The control arrangement comprises a moveable piston and a guide component, one of which has a track and the other has a protruding element received in the track. In a first position, the cover component covers an entrance to the flow port, so that fluid flowing along the bore may not flow into the flow port. In a second position, the cover component does not cover the entrance to the flow port, so that fluid flowing along the bore may flow through the flow port and into the secondary chamber.

Selectively activatable downhole tool

The invention relates to apparatus for use in wellbores and particularly, but not exclusively, to circulating subs used during downhole drilling operations. The apparatus includes a control groove and a pin received within the control groove for determining whether or not a longitudinal movement of a piston in a given direction relative to the apparatus body will move the apparatus between open and closed configurations. The apparatus further includes a control member located between and movable relative to the body and the piston. The control groove is defined in one of the piston and control member, and the pin is provided on the other of the piston and control member. Means are also provided for constraining movement of the piston relative to the body to longitudinal movement only. The invention thus provides an apparatus which has improved reliability in moving between open and closed configurations.

Downhole apparatus

Growing community of inventors

Aberdeen, United Kingdom

Bruce Mcgarian