Neil E Richardson

US Patent:

54482275, Sep 5, 1995

Filed:

Nov 10, 1993

Appl. No.:

8/150941

Inventors:

Jacques Orban - Sugar Land TX
Neil W. Richardson - Houston TX

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G01V 140

US Classification:

3408544

Abstract:

In accordance with illustrative embodiments of the present invention, a measuring-while-drilling system includes a sensor sub positioned at the lower end of a downhole motor assembly so that the sub is located near the drill bit. The sub houses instrumentalities that measure various downhole parameters such as inclination of the borehole, the natural gamma ray emission of the formations, the electrical resistivity of the formations, and a number of mechanical drilling performance parameters. Sonic or electromagnetic telemetry signals representing these measurements are transmitted uphole to a receiver associated with a conventional MWD tool located above the motor, and telemetered by this tool to the surface substantially in real time. The system has particular application to accurate control over the drilling of extended reach and horizontally drilled wells.

US Patent:

54678323, Nov 21, 1995

Filed:

Nov 10, 1993

Appl. No.:

8/150932

Inventors:

Jacques Orban - Sugar Land TX
Neil W. Richardson - Houston TX

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 704
E21B 4709

US Classification:

175 45

Abstract:

In accordance with illustrative embodiments of the present invention, a measuring-while-drilling system includes a sensor sub positioned at the lower end of a downhole motor assembly so that the sub is located near the drill bit. The sub houses instrumentalities that measure various downhole parameters such as inclination of the borehole, the natural gamma ray emission of the formations, the electrical resistivity of the formations, and a number of mechanical drilling performance parameters. Sonic or electromagnetic telemetry signals representing these measurements are transmitted uphole to a receiver associated with a convential MWD tool located above the motor, and telemetered by this tool to the surface substantially in real time. The system has particular application to accurate control over the drilling of extended reach and horizontally drilled wells.