Electrically sequenced tractor

Details Electrically sequenced tractor Electrically sequenced tractor

E - Fixed Constructions

21

B

E21B 17/20 (2006.01) E21B 23/14 (2006.01) E21B 7/06 (2006.01) E21B 19/22 (2006.01)

Patent

CA 2686627

A downhole drilling tractor for moving within a borehole with predetermined speed, thrust and direction based on control signals from the surface and feedback signals from various sensors. The downhole drilling tractor of the invention comprises a tractor body, two packerfeet, two aft propulsion cylinders, and two forward propulsion cylinders. The body comprises aft and forward shafts and a central control assembly. The packerfeet and propulsion cylinders are slidably engaged with the tractor body. Drilling fluid can be delivered to the packerfeet to cause the packerfeet to grip onto the borehole wall. Drilling fluid can be delivered to the propulsion cylinders to selectively provide downhole or uphole hydraulic thrust to the tractor body. The tractor receives drilling fluid from a drill string extending to the surface. A system of spool valves in the control assembly controls the distribution of drilling fluid to the packerfeet and cylinders. The valve positions are controlled by motors. A programmable electronic logic component on the tractor receives the control signals from the surface and feedback signals from various sensors on the tool. The feedback signals may include pressure, position, and load signals. The logic component also generates and transmits command signals to the motors, to electronically sequence the valves. Advantageously, the logic component operates according to a control algorithm for intelligently sequencing the valves to control the speed, thrust, and direction of the tractor.

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