Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate
2005-01-04
2005-01-04
Tsay, Frank (Department: 3672)
Boring or penetrating the earth
Processes
Boring curved or redirected bores
C175S074000, C175S269000, C464S158000, C464S159000
Reexamination Certificate
active
06837315
ABSTRACT:
The invention refers to a rotary steerable drilling tool having a tool collar and a bit shaft. The bit shaft is supported within the tool collar for pivotal movement about a fixed position along the bit shaft. Moreover, the rotary steerable drilling tool includes a variable bit shaft angulating mechanism, located within the interior of the tool collar. The variable bit shaft angulating mechanism includes a motor, an offset mandrel, and a variable offset coupling. The motor is attached to the upper end of the offset mandrel and adapted to rotate the offset mandrel. The upper end of the variable offset coupling is uncoupleably attached to an offset location of the lower end of the offset mandrel, and the upper end of the bit shaft is rotatably coupled to the variable offset coupling. The rotary steerable drilling tool also includes a torque transmitting coupling adapted to transmit torque from the tool collar to the bit shaft at the fixed position along the bit shaft. Finally, a seal system is adapted to seal between the lower end of the tool collar and the bit shaft.
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S. Schaaf, D. Pafitis & E. Guichemerre, “Application of a Point the Bit Rotary Steerable System in Directional Drilling Prototype Well-bore Profiles,”SPE 62519, pp. 1-7, Prepared for presentation at the SPE/AAPG Western Regional Meeting, Long Beach, CA (Jun. 19-23, 2000).
S. Schaaf, CR Mallary & D. Pafitis, “Point-the-Bit Steerable System: Theory and Field Results,”SPE 63247, pp. 1-9, Prepared for presentation at the 2000 SPE Annual Technical Conf. And Exh., Dallas, TX (Oct. 1-4, 2000).
S. Schaaf & D. Pafitis, “Field Applcaiton of a Fully Rotating Point-the-Bit Rotary Steerable System,”SPE/IADC 67716, pp. 1-9, Prepared for presentation at the SPE/IADC Drilling Conf., Amsterdam, The Netherlands (Feb. 27-Mar. 1, 2001).
Kotsonis Spyro
Martinez Ruben
Pisoni Attilio C.
Schaaf Stuart
Echols Brigitte L.
Ryberg John
Schlumberger Technology Corporation
Tsay Frank
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