A Method of Evaluating the Effectiveness of a Hydraulic Oscillator in Horizontal Wells

Bent-housing motor is the most widely used directional drilling tool, but it often encounters problem of high friction when sliding in horizontal wells. In this paper, a mathematical model proposed to simulate slide with reduction tool axial vibration. A term called dynamic effective tractoring force (DETF) defined and evaluate effectiveness. The factors influencing DETF are studied, placement optimization investigated. study finds that rate penetration (ROP) can lower does not change trend curve. To effectively work, shock stiffness must be greater than some critical value. For case study, best oscillating frequency within 15∼20 Hz. reflection vibration at bit boundary intensify or weaken effectiveness, depending on distance between hydraulic oscillator bit. optimal position corresponds plateau stage reliability method verified by field tests. provide design use guide oscillators improve effectiveness