Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1981-07-06
1983-08-09
Pate, III, William F.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 81, 175 80, E21B 706
Patent
active
043973604
ABSTRACT:
A method and apparatus for forming substantially horizontal drain holes into a subterranean formation from a substantially vertical cased wellbore. A casing anchor is set in the casing adjacent the formation and a whipstock is used to mill a window in the casing. A flexible drill string is then used to drill the horizontal drain hole through the window. In one modification, a deflection tool having a deflection surface which has a radius of curvature of between 11 and 28 feet is used for both the milling and drilling operations. In another modification, the milling operation is carried out with a sidetracking whipstock which is then replaced with the above-described deflection tool to carry out the drilling operation. In still another modification, a whipstock adaptor is positioned onto a sidetracking whipstock after the milling operation to convert the sidetracking whipstock into a deflecting tool having the desired radius of curvature for carrying out the drilling operation.
REFERENCES:
patent: 2105722 (1938-01-01), Barrett et al.
patent: 2207920 (1940-07-01), Hughes
patent: 2882015 (1959-04-01), Beck
patent: 3349845 (1967-10-01), Holbert et al.
patent: 3398804 (1968-08-01), Holbert
patent: 4266621 (1981-05-01), Brock
Drain-Hole Drilling publication, by D. H. Stomnot, 8/17/53.
ARCO Drills Horizontal Drainhole for Better Reservoir Placement, by W. D. Moore III, 9/15/80.
Atlantic Richfield Company
Faulconer Drude
Neuder William P.
Pate III William F.
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