Research on Vibration Control Method of Ultra-thick Gravel Layer in Kuqa Piedmont
During drilling the ultra-thick,soft-hard interbedded,gravel layer in Kuqa piedmont area,strong drill-ing tool vibration occur such as slick slip oscillation and bit bounce,which can seriously damage the drilling tool,bit and surface equipment,restricting the development speed and efficiency of the main oil and gas block in Kuqa piedmont.In order to reduce downhole vibration,protect downhole tools,and prolong the service life of drill bit,a PDC bit with good anti-impact,anti-whirl and stability is designed in this paper.In view of the shortcomings of the existing damping tools such as the disc spring shock absorber and anti-slip tool,a is developed,and a bottom hole assembly with vibration decoupling tool proposed based on working experience.Field tests show that the av-erage drop of vibration measured at the drill bit is 30.2％and the average drop of peak vibration is 17.4％.The newly developed drill bit and vibration reduction greatly reduce the impact on the drill bit and composite sheet,extend the service life of the drill bit and meet the needs of rapid drilling,which provides an important reference for vibration control during gravel drilling in China.
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