Directional drilling system with eccentric mounted motor and biaxial sensor and method
This patent describes a directional drilling system of the type which includes a drill string having a plurality of drill stems joined together for drilling a bore through the earth in a prescribed direction. It comprises: a drilling platform having two spaced apart end walls carried by the platform; a frame carried by the platform; a carriage carried by the frame; a drill string drive motor carried by the carriage for rotating the drill string; coupling means for coupling one of the drill stems to the drill string drive motor; and carriage advance means for moving the carriage longitudinally along the frame and platform as the drill string drive motor rotates the drill sting. This patent also describes a method of drilling a bore through the earth in a desired direction using a directional drilling device having a drill sting with a drilling head carried at an outer end. It comprises: excavating a pit in the earth at a starting point of the drill sting; placing a form in the earth pit at a prescribed inclination corresponding to a desired reference entry angle of the drilling string and drilling head; pouring concrete in the earth pit between the form and the earth; placing a drilling platform having a shape generally conforming to the shape of the form in the pit opening of the concrete pit; and assembling the drilling head and drill string on the platform so that the drilling head is oriented in the direction of the reference entry angle.
- Assignee:
- Lag Steering Systems, Rock Mt., NC (United States)
- Patent Number(s):
- US 5133418; A
- Application Number:
- PPN: US 7-646852
- OSTI ID:
- 7026949
- Resource Relation:
- Patent File Date: 28 Jan 1991
- Country of Publication:
- United States
- Language:
- English
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