Axial-torsional nonlinear vibration of bottom hole assembly in the air drilling technology  

作　　者：Shujie Ding Pan Fang Gao Li Junan Lu Yanmin Wang Yang Li Yutian Han Dong Xiao 

机构地区：[1]School of Mechanical Engineering,Southwest Petroleum University,Chengdu,610500,China [2]Petroleum Engineering School,Southwest Petroleum University,Chengdu,610500,China [3]Petrochina Tarim Oilfield,CNPC,Korla,841000,China [4]PetroChina Huabei Oilfield Co,CNPC,834000,China

出　　处：《Petroleum》2024年第3期446-461,共16页油气（英文）

基　　金：supported by[Southwest Petroleum University](Grant number[No.2020D-5007-0312]);[Southwest Petroleum University](Grant number[No.2020CX040103]).

摘　　要：The safety and efficiency of drilling engineering are greatly impeded by destructive vibrations of drill string in air drilling,such as stick-slip,bit-bounce and their coupled vibrations.To avoid or suppress these vibrations improving the stability of drilling operations,revealing the occurrence mechanisms of abovementioned harmful vibrations are indispensable by investigating dynamics characteristics of drill string system.In this paper,an axial-torsional coupled dynamics model that can capture the motion behaviors of bottom hole assembly(BHA)is established adopting the lumped parameter method.Subsequently,a rate of penetration(ROP)model appropriating for air drilling is obtained firstly by linear fitting means.Meanwhile,a novel discontinuous support model is established to describe the bitformation interactions.Then,BHA dynamics are discussed using numerical simulations under different vibration scenarios:normal operation;stick-slip;bit-bounce;bit-bounce and stick-slip combination.Subsequently,in two drilling modes:the continuous and intermittent drilling,the vibration mitigation strategies and dynamics sensibility study of BHA are carried out based on the parametric analysis.The results show that increasing torsional stiffness of drill-pipes,appropriately adjusting rotation speed of top driven system and dynamic weight on bit(WOB)are deemed as an effective strategy suppressing or eliminating stick-slip and bit-bounce vibrations of BHA.Suggest that the rotation speed of top driven system and dynamic WOB are 5 rad/s and 3.5 kN,respectively.Finally,the constructed probability maps allow to driller to choose reasonable mechanical parameters,thereby realizing smooth drilling operation in the air drilling.

关 键 词：Drill string BHA Contact model ROP STICK-SLIP Bit-bounce 

分 类 号：TE24[石油与天然气工程—油气井工程]