Method of and apparatus for drilling a horizontal controlled borehole in the earth
Patent 4953638 Issued on September 4, 1990. Estimated Expiration Date: 
June 27, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 27, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1766202 2122063 2196940 2324102 2350986 2686660 2903239 3451491 3746106 Method and apparatus for laying pipes in the ground InventorAssigneeApplicationNo. 211889 filed on 06/27/1988US Classes:175/61, Boring curved or redirected bores33/304, Borehole direction or inclination175/45, Tool position direction or inclination measuring or indicating within the bore175/62, Boring horizontal bores175/73, MEANS TRAVELING WITH TOOL TO CONSTRAIN TOOL TO BORE ALONG CURVED PATH175/162, WITH ABOVE-GROUND MEANS TO FEED TOOL175/220, WITH ABOVE-GROUND GUIDE FOR RELATIVELY ADVANCING TOOL175/400Nonsymmetrical arrangement of opening for cuttings or fluidExaminersPrimary: Dang, Hoang C.Attorney, Agent or FirmForeign Patent References
International ClassesE21B 007/06E21B 010/00 AbstractA method of boring a hole in the earth such as for passing under obstacles, not limited, but including roadways, rivers, dikes, canals or other inexcessible areas where it is impossible to trench a ditch including the steps of advancing a rotating drill string in a direction inclined to the earth's surface to establish a borehole, stopping the rotation and advancement of the drill string, aligning the drill pipe so that the drill bit is inclined at an angle relative to the axis of the drill string towards a new direction desired for the borehole, advancing the drill string and drill bit a short distance without rotation, resuming rotation advancement of the drill string for a short distance, sequentially repeating the steps of advancing the rotationally aligned drill string without rotation to move the drill bit in the newly desired direction, followed by rotation with simultaneous advancement until the new direction of drilling is achieved, after which, until a still different direction is desired, drilling is continued by simultaneously rotating and advancing the drill string.Other References
Field of SearchTool position direction or inclination measuring or indicating within the boreBoring horizontal bores Boring curved or redirected bores Normally curved guide or shaft MEANS TRAVELING WITH TOOL TO CONSTRAIN TOOL TO BORE ALONG CURVED PATH WITH MEANS TO SIMULTANEOUSLY FEED AND ROTATE TOOL FROM A SINGLE MECHANICAL ELEMENT WITH ABOVE-GROUND MEANS TO FEED TOOL WITH MEANS TO FEED DRIVE WITH ABOVE-GROUND GUIDE FOR RELATIVELY ADVANCING TOOL With fluid conduit lining or element (e.g., slush tube) Forked rotary nontracking Nonsymmetrical bit With bore wall engaging guide Nonsymmetrical arrangement of opening for cuttings or fluid Providing identifiable indication of core position in situ for core sample orientation Process Horizontal angle measurer Alignment device Borehole or tube interior study Borehole direction or inclination Etching or marking liquid determines orientation Pendulum mounted or directed marker With marker Requiring no modification of the work Elastic bias type clamping Encircling clamp, loop, or strap | |
