METHOD OF GPS-BASED (VERSIONS) AZIMUTH WELL DIRECTIVITY CONTROL AND CHECKING INCLINATION APPARATUS FOR IMPLEMENTATION OF METHOD OF GPS-BASED AZIMUTH WELL DIRECTIVITY CONTROL Russian patent published in 2011 - IPC E21B47/22 G01V3/00 G01C25/00 

FIELD: oil and gas production.

SUBSTANCE: method of azimuth well directivity control is implemented in a continuous or point measurement mode. The continuous measurement mode involves measuring azimuth angles and determining rate of azimuth angle increase Δα by discrete angular velocity integration of an inclination apparatus, to a base azimuth angle, deriving thereby a magnetic azimuth and a geographic azimuth of a well path, and determining a magnetic declination of the well. The point measurement mode of the surveyed well implies that in each set point of a well bore, a fixed inclination apparatus is used to measure the geographic and magnetic azimuth angles. Comparing the measured values of the magnetic declination with a reference value for a given zone enables evaluating azimuth measurement reliability of the given inclination apparatus. For downhole instrument adjustment, the checking inclination apparatus is provided with a global positioning system GPS which is used to preset an azimuth angle of a gyroscope of the inclination apparatus and to fix this value in a memory of above-ground equipment.

EFFECT: higher measurement accuracy of azimuth well directivity, ensured control of operational reliability of the inclination apparatus in the well, enhancement of the checking inclination apparatus.

2 dwg, 3 cl