Downhole drilling apparatus

Patent · Tue Jan 18 04:00:00 EST 1983

OSTI ID:6406337

Cousins, J E

A downhole drilling apparatus for drilling holes at right angles to a vertical well hole which includes a tubular housing capable of being inserted in the well hole and containing at least one elbow tube or guide, and multiple tapered and splined, interlocking drilling segments which are rotatably stacked and nested as a segment string in the guide tube with the bottom one of the drilling segments designed for drilling through the well casing, the concrete sheathing and into the production interval, and the top one of the segments cooperating with a drive means to effect rotation of the nested segments inside the guide. The guide tube extends from the tubular housing wall upwardly and telescopes at the top of the segment string to permit slidable movement of the drive means inside the tubular housing and slidable and rotatable movement of the nested segments inside the guide tube and into the production interval. In a preferred embodiment of the invention a pair of guide tubes and cooperating segment strings are provided in the tubular housing for drilling two transverse drain holes simultaneously.

• Assignee: EDB-83-064499
• Patent Number(s): US 4368786
• OSTI ID: 6406337
• Country of Publication: United States
• Language: English

Related Subjects

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42 ENGINEERING
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DESIGN
DIRECTIONAL DRILLING
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
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WELLS