National Oilwell Dht, L.p.

Nov Downhole Eurasia Limited

Andergauge Limited

Alastair Henry Walter MacFarlane

Alan Martyn Eddison

Rory McCrae Tulloch

Alan MacKenzie

Alagappan Viswanathan

A selective downhole actuator comprising at least a first actuator position, a second actuator position and a third actuator position. The selective downhole actuator is reconfigurable between the first actuator position and the second actuator position. The selective actuator is selectively reconfigurable to the third actuator position by varying an operating parameter during a transition of the selective downhole actuator between the first and second actuator positions.

Selective downhole actuator

A drilling assembly assembly includes a hammer motor, a shaft, a driver, and a hammer (). The shaft is operatively connectable to the hammer motor and rotated thereby. The driver is operatively connectable to the shaft, and includes a cam (such as guide channel) rotatable with the shaft and a fixed guide (such as guide pins) having a guide surface thereon. The cam is engageable with the guide surface and axially movable thereabout during rotation thereof. The hammer is operatively connectable to the driver and axially movable therewith, axially movable within the housing () independently from axial movement of the housing, and engageable with the bit to impart an impact thereto whereby the bit is hammered.

Downhole drilling assembly with motor powered hammer and method of using same

A downhole tool comprises a body defining a fluid inlet and two or more fluid outlets. A valve arrangement cycles the proportion of fluid directed from the inlet to each of the outlets. One of the outlets may be associated with a fluid pressure responsive device, such as a cleaning blade.

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Angus, United Kingdom

Alastair Henry Walter MacFarlane