Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Patent
1982-07-08
1983-12-13
Purser, Ernest R.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Tool position direction or inclination measuring or...
175 61, 175 82, E21B 708
Patent
active
044200498
ABSTRACT:
Directional drilling is carried out by orienting and positioning a whipstock having a curved guide surface at a predetermined rotational angle with respect to the desired azimuth so as to compensate for lateral deviation of the original bore or rathole. The curved guide surface of the whipstock is given a radius of curvature in a longitudinal direction corresponding to that of the drainhole section radius and is provided with a concave face in a transverse direction which defines lateral wings along the guide surface to control the advancement of the drilling tool along the desired course and avoid objectionable helixing. Proper orientation and guidance of the drill tool by means of the radius whipstock as described permits accurate determination of the drainhole orientation vertical drill distance between the zenith and nadir of the drainhole as well as the actual drilled depth between those points.
REFERENCES:
patent: 1595977 (1926-08-01), Prindle
patent: 2131849 (1938-10-01), Tolson
patent: 2544982 (1951-03-01), Buttolph
patent: 2669428 (1954-02-01), Zublin
patent: 2953350 (1960-09-01), Moore
patent: 3116799 (1964-01-01), Lemons
patent: 3225830 (1965-12-01), Livingston
patent: 3349845 (1965-12-01), Holbert et al.
patent: 3398804 (1968-08-01), Holbert
Purser Ernest R.
Reilly John E.
Starinsky Michael
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