FIELD: methods of determination of zenith and sight angles for measurement of well inclination and deviation of drilling tool. SUBSTANCE: installed in converter body are three orthogonal pendulums with angular-movement pickups. Axis of rotation of the third pendulum is oriented by body longitudinal axis. Measured a priori are parameters σ and ρ - angles of nonorthogonal setting of the first pendulum with respect to body base in planes OXY and OXZ, respectively; parameter γ - angle of nonorthogonal setting of the second pendulum with respect to body in plane OYZ; parameters ε and λ - angles of nonorthogonal setting of the third pendulum with respect to body base in planes OXZ and OYZ, respectively. Zenith angles θ and sight angles ϕ in discredited ranges are determined by measured signals from angular-movement pickups βi (i=1,2,3) and parameters σ, ρ, γ, ε and λ from respective mathematical expressions for various zenith angles θ≤ 45 deg or θ≥ 45 deg and various ranges of sight angles ϕ. EFFECT: higher accuracy of determination of zenith and sight angles due to taking into account of angular parameters responsible for instrument errors. 1 dwg
