Reeves Wireline Technologies Limited

Michael John Chaplin

Simon Christopher Ash

James Roger Samworth

Michael Charles Spencer

Charles Richard Easter

A logging tool or sub () for downhole use comprises an elongate logging tool body (); one or more moveable reaction members; and a locking member for the reaction members. At least one arm () at a first location is pivotably secured to the body () to be extensible therefrom and compressible towards the body (); and at a second location spaced from the first location is pivotably secured to a locking member (); and a stop member () fixed or fixable relative to the body (). The locking member () defines a moveable end () remote from the second location and moveable relative to the arm () between at least a first position in which force tending to compress the arm () towards the body () causes the end () to move away from the stop member (), and a second position in which force tending to compress the arm () towards the body () causes the stop member () to resist movement of the locking member () thereby preventing compression of the arm () towards the body (). Alternatively, one or more cam and follower arrangement or rack and pinion arrangement can be used.

Logging tool

A logging tool or logging tool sub () for downhole use comprises an elongate cylindrical body () having supported thereby one or more movable landing extensions () that are movable between an extended position in which part of each said movable landing extension protrudes beyond the exterior of the cylindrical body () so as to define one or more exposed landing surfaces that are engageable with one or more landing surfaces () of a further component; and a retracted position in which each said movable landing extension () protrudes externally of the cylindrical body no further than the exterior thereof ().

Logging tool and method of use

A logging tool, toolstring (), or element () comprises a stabilizer including a pair of moveable, rigid, main stabilizer arms () that each is pivotably secured adjacent to one another at one end to the logging tool or toolstring. As a result the arms () are moveable between a relatively retracted position on the one hand and a relatively advanced position on the other in which the main stabilizer arms diverge from one another and protrude from the logging tool so as to present a pair of main arm free ends () that are spaced from an outer surface of the tool and are engageable with a borehole surface. The logging tool () or element () includes a mechanism for effecting coordinated, powered, linked movement of the main stabilizer arms () between the retracted and advanced positions.

Apparatus and methods for orienting, stabilizing, or stably operating a logging tool

A valve assembly () comprises a drillpipe () defining a hollow, generally cylindrical interior having secured therein a valve member () that is moveable between an open position, permitting passage of an object through the valve (), and a closed position preventing passage of fluids along the drillpipe (). A resiliently contractile arm () interconnects the valve member () and the drillpipe () so as to urge the valve member () towards the closed position and such that when an object passes along the drillpipe () and engages the valve member () or the arm () the valve member () occupies the open position.

Valve assembly

The apparatus includes a pump for circulating pressurized fluid in a wellbore. A control device controls the pump which a conduit interconnects to the wellbore. A downhole transducer detects changes in fluid pressure at a downhole location and generates signals accordingly. A processor generates actuator commands based on the signals. Actuators activate a downhole tool based on the actuator command. A modulating valve modulates the fluid pressure. A remote transducer detects the pressure remotely from the downhole transducer. The control device causes the pump to generate acoustic signals in the fluid via wave forms which the downhole transducer detects. The modulating valve generates wave forms in the fluid. The control device sends control signals via the fluid to the downhole transducer. Consequently the processor actuates the tools. Following correct actuation the modulating valve generates signals via pressure changes which the remote transducer receives to indicate successful tool deployment.

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Warwickshire, United Kingdom

Michael John Chaplin