BOTTOM-HOLE MOTOR ACTING AS WHIPSTOCK Russian patent published in 1999 - IPC

FIELD: bore-hole drilling technology. SUBSTANCE: bottom-hole motor can be used in drilling incline-directed and horizontal bore-holes. Bottom-hole motor acting as whipstock has lower guiding section, curved adapter, and upper power section which is made up of individual power units with various geometric dimensions which are interconnected by relations referring to rigid systems. These relations are as follows: , l_n = D_т(n-1) - D_т(n)/tg(α-β) where K - coefficient of bore-hole widening; l₁, l₂, l₃ - length of respective first, second and n power units, m; D_b - diameter of bore-hole, m; D_т(1), D_т(2), D_т(n) - diameter of respective first, second and n power units, m; α - - skewness angle of axes of curved adapter, deg.; β - - angle of incline of axis of lower guiding section with respect to axis of bore-hole, deg. Aforesaid values for resilient and flexible systems are determined by experimental method. Application of aforesaid arrangement improves power characteristics of bottom-hole motor acting as whipstock. EFFECT: higher efficiency. 1 dwg