Apparatus and method for drilling a branch borehole from an...

Details Apparatus and method for drilling a branch borehole from an... Apparatus and method for drilling a branch borehole from an...

E - Fixed Constructions

21

B

E21B 7/08 (2006.01)

Patent

CA 2517753

A wireline drill train is used to drill an elongated, small diameter, lateral branch borehole from near the base of a main well. The drill train, includes a drill module, a first self-propelled thrust module coupled to the drill module, and a second self- propelled thrust module pivotally coupled to the first self-propelled thrust module. Each thrust module includes at least two extendible thrusters. Each extendible thruster includes a six-bar mechanism and a traction tread. The drill train further includes a first articulated linkage linking the first self-propelled thrust module to the drill module, and a second articulated linkage linking the second thrust module to the first thrust module. The second articulated linkage includes a thrust-transmission bar and three retractable stiffener bars. The method for drilling the curved transition region of the lateral branch borehole includes executing a series of alternating pivotal drilling steps and forward drilling steps to create a step-cut region of branch borehole having very small radius of curvature.

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