Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1985-10-11
1987-05-26
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 73, 175 75, 175 76, E21B 708
Patent
active
046677518
ABSTRACT:
A system and method for controlled directional drilling utilizes a system approach to design the hardware for drilling according to the well plan. The bend angle of a bent housing, connected between the bit and a down-hole motor, the diameter of a plurality of stabilizers and placement of the stabilizers with respect to the drill bit are selected and predetermined on the basis of the desired well plan. With the use of an MWD, the direction of the progressing borehole is tracked from the surface. Direction changes as required are controlled from the surface simply by controlling rotation of the drillstring. For curved path drilling, only the downhole motor is rotated, causing the borehole to travel along the curve determined by the bend angle in the bent housing and the diameter and location of the concentric stabilizers. When straight hole drilling is required, both the down-hole motor and the entire drill string are rotated, effectively nullifying the effect of the bend angle in the bent housing.
REFERENCES:
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patent: 4067404 (1978-01-01), Crase
patent: 4577701 (1986-03-01), Dellinger et al.
T. Brassfield and H. Karlsson, Drill Faster, More Accurately with New Navigation System, pp. 38-40, World Oil, 8-1-1985.
R. Feenstra & A. W. Kamp, A Technique for Continuously Controlled Directional Drilling, pp. 11-27, 1984 Drilling Tech. Conference.
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R. Newton, et al., A Case Study Comparison of Wells Drilled With or Without MWD Directional Surveys on the Claymore Platform in the North Sea, pp. 1867-1876, Journal of Petroleum Tech., Nov. 1980.
M. Gearhart, et al., Mud Pulse MWD Systems Report, pp. 2301-2306, Journal of Petroleum Tech., Dec. 1981.
W. B. Bradley, Factors Affecting the Control of Borehole Angle In Straight and Directional Wells, pp. 679-688, Journal of Petroleum Technology, Jun. 1985.
L. J. Durand, Kicking Off in Large-Diameter Holes, pp. 2377-2384, Journal of Petroleum Technology, Oct. 1982.
DeLucia Frank
Geczy Bela
Melius Terry Lee
Novosad Stephen J.
Smith International Inc.
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