Geodynamics, Inc.

Impact Selector Limited

Peter Alan Joiner

Andrew John Elrick

Iain Morrison Macleod

Paul Andrew Church

John Thomas Hardesty

Dennis E Roessler

A roller toolthat can be connected into a string for deployment into an oil or gas well includes at least two rollers or wheelslocated on each side of the roller tool, with axes of rotation that are perpendicular to the axis of the roller tool. The roller tool further includes at least two interconnecting tubular portions, where one tubular portioncomprises a mandrelthat connects to another tubular portion. An annular hubis fitted over the mandreland the rollersare connected onto the hub. The tubular portionscomprise circumferential sleeve sectionsthat partially extend over the rollersand resist detachment of the rollersfrom the roller tool. The roller toolcan aid passage of a string through a well by holding the string away from the walls of the well and reducing frictional contact.

Roller tool

A time delay apparatus for use with a downhole tool in a wellbore casing. In an exemplary embodiment, the apparatus includes an electronic circuit comprising a timer, a fusible link, a split spool device that includes a center pin held in place in a restrained position with a spool and a spring element surrounding the spool. A pressure applied to a trigger device, such as a rupture disk, activates a pressure switch and starts a timer, configured with a preset countdown time, in the electronic circuit. On expiration of the timer, the timer block of the electronic circuit generates a signal to cause breaking of the fusible link and releasing of the spring element such that the center pin of the split spool travels to a functional position and activates the downhole tool.

Electronic time delay apparatus and method

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Danestone, United Kingdom

Peter Alan Joiner