Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...
Patent
1992-10-29
1994-03-29
Bui, Thuy M.
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
E21B 708
Patent
active
052976408
ABSTRACT:
An improved drilling drill collar particularly for use in drilling horizontal wells employing a fluid driven drill, the drill collar being in the form of an elongated intermediate portion of at least substantially triangular cross-sectional configuration and having a central passageway therethrough and having externally threaded ends, the intermediate portion being formed of a lightweight metal, such as aluminum, magnesium or alloys therefore, a first tubular tool joint member threadably secured to the intermediate portion first end and a second tubular tool joint member threadably secured to the intermediate portion second end, one of the tool joint members having female threads and the other external threads so that thereby joints may be threadably secured end-to-end, the tool joint members being of a stronger metal, such as steel, the triangular configuration of the drill collar permitting free flow of well drilling circulation fluid as the drill collar lies in a horizontal borehole.
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