Azimuth measuring method for non-vertical drilling

Details Azimuth measuring method for non-vertical drilling Azimuth measuring method for non-vertical drilling

1985-09-09

1987-01-20

Novosad, Stephen J.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

175 61, 324346, E21B 706

Patent

active

046374809

ABSTRACT:
In a method of measuring azimuth for non-vertical drilling, during rotation of the drill pipe string two components of the magnetic field are measured continuously within a cylindrical section of the drill pipe string. This section is fabricated from the ferromagnetic steel usually employed for fabricating the drill pipes. The two components are measured by a magnetometer and lie along two axes perpendicular to the axis of the section and rotating with it. At the moment when the component of the acceleration due to gravity is maximum along one of these two axes, an accelerometer device commands the calculation and recording of the ratio of the two measured components of the magnetic field. On the basis of the value thus recorded, the measured inclination of the drill pipe string and the local inclination of the magnetic field, the azimuth of the drill pipe string relative to magnetic north is calculated. The method may be used for the continuous determination of the position of a drilling tool during the progress of drilling along a curve.

REFERENCES:
patent: 2656505 (1953-10-01), Hewitt, Jr.
patent: 3657637 (1972-04-01), Claret
patent: 3731752 (1973-05-01), Schad
patent: 4443762 (1984-04-01), Kuckes
"Magnetostatic Methods for Estimating Distance and Direction from a Relief Well to a Cased Wellbore", Jun. 1972.

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