The Dynamics Analysis Of Rod String In Screw Pump Well And Research Eccentric Wear Prevention Methods

Drill column is an important drilling equipment, which is a hub connected to ground and underground. Drill string in the underground working conditions are very bad complex. On-site survey showed that across the country oilfield drill string failure accidents occur every year since 1992, thousands of direct economic losses of one hundred million. Drillstring failure is also common abroad. The topics of the purpose is to extend the service life of drill to improve drilling efficiency and reduce drilling costs, which makes sense for drill design and drilling.First of all, this paper drill stem and field conditions carried out a statistical analysis of the damage, describes the characteristics of damage to drill string, as well as the causes and characteristics of damage were analyzed with drillstring vibration led to a major factor in damage to drill string. Secondly, this article through the drill string contact with friction and non-linear damping of the equivalent, will drill at the drill pressure, torque, reduced to simple harmonic disturbance force, established a drill string vibration modal analysis model, through the use of modal superposition method , combined with drill stem structure and force the state has established for the analysis of drillstring vibration characteristics of the software, right deep practical BHA for different working conditions of the numerical calculation, the impact of drill string vibration of the main factors. Again, through the drill string vibration factors research in optimization of drilling parameters, bit selection and other designs of the next field test, analysis the test wells with non-optimized design of a comparative. Finally, use three-dimensional software to design new damper. Through the shock absorber ground tests to verify the mechanical properties of tools, design specifications, and comparative analysis with two-way shock absorber. Through on-site test, arriving at the anti-vibration measures may reduce the drilling cycle, save drilling costs and improve service life of drill string.This paper to study the impact of oil drill string vibration factors provide the basis for this depth on the ground for future power rotary drilling, especially in deep drilling has extremely important practical significance.