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US2722494A
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Process for producing flexible drill pipe having wear resistant mating surfaces
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US2743083A
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Apparatus to impart vibrating motion to a rotary drill bit
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US2804926A
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Perforated drain hole liner
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US2745635A
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Apparatus for drilling wells of large radii curved bores
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US2717146A
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Heavy duty flexible drill pipe
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US2745634A
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Apparatus for drilling wells with oriented curved bores of large radii
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US2680358A
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Flexible conduit for high-pressure fluid
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US2699920A
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Apparatus for drilling laterally deviating bores from a vertical bore below a casing set therein
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US2708099A
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Flexible resilient normally curved tubular drill guide having friction shoes
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US2684581A
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Flexible jointed drill pipe
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US2669429A
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Apparatus for drilling deviating bores utilizing a plurality of curved tubular drillguide sections
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US2669430A
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Apparatus for drilling deviating bores utilizing a plurality of straight tubular drill guide sections
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US2706615A
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Normally curved flexible resilient drill guide and method for producing the same
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US2614809A
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Diamond drill bit for rotary well drilling
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US2651499A
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Stabilized apparatus for drilling curved bores deviating from existing vertical wellbores
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US2664270A
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Apparatus for controlling the course of a lateral bore deviating from a vertical well bore
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US2631820A
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Apparatus for drilling curved bores deviating from existing vertical well bores
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US2642267A
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Apparatus for initiating and drilling deviating curved bores from existing vertical wll bores
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US2634097A
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Apparatus for drilling curved lateral bores deviating from an existing well bore
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US2669428A
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Apparatus for drilling lateral bores deviating from vertical well bores
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