1
George Telfer, Edward Docherty Scott, Rae Andrew Youngor, James Edward Atkins: Downhole tool. Specialised Petroleum Services Group, Osha Liang, August 26, 2008: US07416029 (109 worldwide citation)

A downhole tool which can perform a task in a well bore, such as circulating fluid radially from the tool. The function is selectively performed by virtue of a sleeve moving within a central bore of the tool. Movement of the sleeve is effected by dropping a ball through a ball seat on the sleeve. Mo ...


2
George Telfer: Multi-cycle downhole tool with hydraulic damping. Specialised Petroleum Services Group, Osha Liang, December 8, 2009: US07628213 (28 worldwide citation)

A downhole tool which includes a locking bar to allow movement of a sleeve within the tool over a pre-defined range. The range is defined by a recess arranged axially or circumferentially in the tool, in which the bar locates. Fluid can be vented from the recess to provide a hydraulic brake, to prev ...


3
George Telfer: Pressure controlled downhole operations. Specialised Petroleum Services Group, Osha • Liang, February 23, 2010: US07665545 (22 worldwide citation)

A method and apparatus for temporarily increasing fluid pressure at a specific location in a work string to perform an operation in an oil or gas well bore. Apparatus is provided which, in a first position provides fluid flow through the work string; in a second position provides the desired increas ...


4
Paul David Howlett: Downhole tool with actuable barrier. Specialised Petroleum Services Group, C Dean Domingue, Robert L Waddell, Ted M Anthony, January 29, 2008: US07322408 (22 worldwide citation)

A downhole tool for use in a cased or lined well bore (40), the tool including a barrier (36) arranged on an outer surface of the tool. The barrier may be of a resilient material so that it can be deformed on actuation to control the passage of fluid between the tool and the casing or liner. Fluid f ...


5
George Telfer: Stabiliser, jetting and circulating tool. Specialised Petroleum Services Group, Osha Liang, June 10, 2008: US07383881 (19 worldwide citation)

A downhole tool (10) for use in oil and/or gas well bores. The tool has a tubular body (20) and a sleeve (22) including stabilizer blades (30). The tool is ball (76), activated, weight activated or hydraulically activated to selectively jet fluid from the body through jetting ports (44A, 44B, 44C) o ...


6
George Telfer: Downhole tool. Specialised Petroleum Services Group, Osha • Liang, March 10, 2009: US07500526 (14 worldwide citation)

A downhole tool (10) for use in isolating a formation in a well bore from fluid pressure introduced from the surface. Mounted in a work string, the tool provides an axial throughbore (18) and radial outlets (40, 42) above and below a permanent sealing element (26), such as a diverter cup. Valve memb ...


7
George Telfer: Selectively operational cleaning tool. Specialised Petroleum Services Group, C Dean Dominque, Robert L Waddell, Ted M Anthony, October 17, 2006: US07121343 (14 worldwide citation)

A downhole cleaning tool (10) for oil and gas wells. Brushes, scraper, wipers (32) and the like are mounted on a sleeve (14) over a tubular body (12), and the members successively moved towards and away from an inner surface of a tubular to be cleaned. Movement is created by a jarring action on the ...


8
Telfer George, Scott Edward Docherty, Younger Rae Andrew, Atkins James Edward: Downhole tool. Specialised Petroleum Services Group, Telfer George, Scott Edward Docherty, Younger Rae Andrew, Atkins James Edward, KENNEDYS PATENT AGENCY, October 14, 2004: WO/2004/088091 (13 worldwide citation)

A downhole tool which can perform a task in a well bore, such as circulating fluid radially from the tool. The function is selectively performed by virtue of a sleeve moving within a central bore of the tool. Movement of the sleeve is effected by dropping a ball through a ball seat on the sleeve. Mo ...


9
George Telfer: Junk removal tool. Specialised Petroleum Services Group, Osha • Liang, March 3, 2009: US07497260 (12 worldwide citation)

A junk removal tool (10) for use in a well bore. The tool includes a multi-faceted face (42) of tungsten carbide to break up large pieces of junk. The junk is then captured in the tool via large area inlet ports (40) and collected in a trap (31). In one embodiment, valves (41) are placed at the inle ...


10
Paul David Howlett, George Telfer: Combined milling and scraping tool. Specialised Petroleum Services Group, C Dean Domingue, Robert L Waddell, Ted A Anthony, August 29, 2006: US07096950 (11 worldwide citation)

A downhole tool (1) for providing the dual role of cleaning and milling within a wellbore casing or liner is described. In an embodiment scraper blades (6) are mounted on a body (2) together with a milling sleeve (4). Additionally, a centralizer sleeve (3) is incorporated as is a filter and/or junk ...