METHOD FOR DETERMINING WELL DEVIATION ANGLES Russian patent published in 2014 - IPC E21B47/22 

FIELD: mining.

SUBSTANCE: invention proposes a method for determining well deviation angles, which involves measurement of projections of magnetic field intensity with ferroprobes, measurement of projections of free fall acceleration with accelerometers, measurement of projections of the Earth angular speed with gyroscopes on an inclinometer axis, conversion of primary signals and determination of spatial orientation of a well shaft. Error of gyroscopic sensors is evaluated by means of information received from a satellite navigation system, and drift value of gyroscopic sensors is corrected considering information received from ferroprobes. In case magnetic abnormalities are absent, orientation angles are calculated as per signals received from ferroprobes and accelerometers. And at operation in media with abnormal magnetic properties or cased with steel pipes, well orientation parameters are calculated as signals received from gyroscopes and accelerometers.

EFFECT: enlarging functional capabilities of the method owing to making measurements in cased and non-cased wells; improving accuracy of the device that implements it due to joint use of ferroprobes and gyroscopes, and compensation of drift of the latter.

2 dwg