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| NUMERICAL ANALYSIS OF AIR HAMMER BIT DRILLING BASED ON ROCK FATIGUE MODEL |
| ZHU Xiaohua1，2，LUO Heng1，JIA Yanjie1 |
(1. School of Mechatronic Engineering，Southwest Petroleum University，Chengdu，Sichuan 610500，China；2. State Key
Laboratory of Oil and Gas Reservoir Geology and Exploitation，Southwest Petroleum University，Chengdu，Sichuan 610500，China) |
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Abstract Taking PGP-X well located in Northeast Sichuan province as the research object，the rocks have been sampled respectively between depths of 2 140–4 914 m. Laboratory experiments of static and dynamic mechanical properties of the sampled rocks are performed with the split Hopkinson pressure bar(SHPB)and material test system. By using LS-DYNA，piston-drilling bit-rock interaction system model for air hammer bit drilling is established. In the simulation model，H-J-C dynamic constitutive model is adopted for rock. Taking the damage accumulation caused by the repeated impulsive load into consideration，rock intensity at well bottom is modified after being impacted every time. On this foundation，drilling parameters，structure parameters of air hammer，and the relationship between impact energy and crushing work ratio are researched；and the influences of impact energy，final impacting speed，drilling pressure，impact frequency，rotary speed，well depth and lithologic characters on rock crushing efficiency are explored. The analysis results show that the impact energy-crushing work ratio curve has fluctuation zones and stable zones with clear boundary，so that the critical impact energy and critical drilling pressure of air hammer bit drilling can be obtained. Further research indicates that the critical impact energy and critical drilling pressure are closely related with well depth and lithologic character. With the increase of well depth and rock hardness，both critical impact energy and critical drilling pressure have a tendency of gradually declining. After the simulation of air hammer bit drilling in different formations and lithologies，combinations of critical impact energy，critical drilling pressure，the best rotary speed and impact frequency in typical deep formations are recommended. These results can be for references in field practices for air hammer bit drilling.
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Received: 08 August 2011
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| [1] 沈忠厚，黄洪春，高德利. 世界钻井技术新进展及发展趋势分析[J]. 中国石油大学学报：自然科学版，2009，33(4)：64–70.(SHEN Zhonghou，HUANG Hongchun，GAO Deli. Analysis of new development and development trend of worldwide drilling technology[J]. Journal of China University of Petroleum：Natural Science，2009，33(4)：64–70.(in Chinese))
[2] 侯树刚，李铁成，舒尚文，等. 空气锤及空气钻头在普光气田的应用[J]. 天然气工业，2007，27(9)：65–67.(HOU Shugang，LI Tiecheng，SHU Shangwen，et al. Application of air hammer and air bit to Puguang gas field[J]. Natural Gas Industry，2007，27(9)：65–67.(in Chinese))
[3] ADEWUMI M A，TIAN S F. Determination of optimal air flow rate in air drilling[J]. Journal of Petroleum Science and Engineering，1992，8(1)：1–11.
[4] MELAMED Y，KISELEV A，GELFGAT M，et al. Hydraulic hammer drilling technology：developments and capabilities[J]. Journal of Energy Resources Technology，2000，122(1)：1–8.
[5] 陈 勉，金 衍，张广清. 石油工程岩石力学[M]. 北京：科学出版社，2008：154–161.(CHEN Mian，JIN Yan，ZHANG Guangqing. Petroleum engineering rock mechanics[M]. Beijing：Science Press，2008：154–161.(in Chinese))
[6] 陈济峰，燕修良，高航献. 川东北地区气体钻井技术实践与认识[J]. 石油钻探技术，2009，37(4)：39–42.(CHEN Jifeng，YAN Xiuliang，GAO Hangxian. Gas drilling technique in Northeast Sichuan basin[J]. Petroleum Drilling Techniques，2009，37(4)：39–42.(in Chinese))
[7] HAN G，BRUNO M S. 3D Simulation of rock breakage with air hammers in gas-well drilling[C]// Proceedings of the 2006 SPE Gas Technology Symposium Held in Calgary. Alberta，Canada. Oklahoma：Society of Petroleum Engineers，2006：1–8.
[8] 李国华，陶兴华. 动、静载岩石破碎比功试验研究[J]. 岩石力学与工程学报，2004，23(14)：2 448–2 454.(LI Guohua，TAO Xinghua. Testing study on crushing work ratio of rock under dynamic and static loads[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(14)：2 448–2 454.(in Chinese))
[9] 赵伏军，李夕兵，冯 涛，等. 动静载耦合作用下岩石破碎理论分析及试验研究[J]. 岩石力学与工程学报，2005，24(8)：1 315–1 320. (ZHAO Fujun，LI Xibing，FENG Tao，et al. Theoretical analysis and experiments of rock fragmentation under coupling dynamic and static loads[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(8)：1 315–1 320.(in Chinese))
[10] 林元华，施太和，李润方，等. 空气冲旋钻井冲击力和机械钻速仿真研究[J]. 岩石力学与工程学报，2005，24(18)：3 337–3 341.(LIN Yuanhua，SHI Taihe，LI Runfang，et al. Simulation of impact force and penetration rate of air hammer bit drilling[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(18)：3 337–3 341.(in Chinese))
[11] 黄志强，范永涛，魏振强，等. 冲旋钻头破岩机制仿真研究[J]. 西南石油大学学报：自然科学版，2010，32(1)：148–150.(HUANG Zhiqiang，FAN Yongtao，WEI Zhenqiang，et al. Emulation study of rock breaking mechanism of percussion rotary bit[J]. Chinese Journal of Southwest Petroleum University：Science and Technology，2010，32(1)：148–150.(in Chinese))
[12] 葛修润，任建喜，蒲毅斌，等. 岩石疲劳损伤扩展规律CT细观分析初探[J]. 岩土工程学报，2001，23(2)：191–195.(GE Xiurun，REN Jianxi，PU Yibing，et al. Primary study of CT real-time testing of fatigue mesodamage propagation law of rock[J]. Chinese Journal of Geotechnical Engineering，2001，23(2)：191–195.(in Chinese))
[13] 倪骁慧，李晓娟，朱珍德. 不同频率循环载荷作用下花岗岩细观疲劳损伤特征研究[J]. 岩石力学与工程学报，2011，30(1)：164–169. (NI Xiaohui，LI Xiaojuan，ZHU Zhende. Characteristics of meso- damage of granite samples subjected to dynamic uniaxial cyclic loading with different frequencies[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(1)：164–169.(in Chinese))
[14] 李树春，许 江，陶云奇，等. 岩石低周疲劳损伤模型与损伤变量表达方法[J]. 岩土力学，2009，30(6)：1 611–1 619.(LI Shuchun，XU Jiang，TAO Yunqi，et al. Low cycle fatigue damage model and damage variable expression of rock[J]. Rock and Soil Mechanics，2009，30(6)：1 611–1 619.(in Chinese))
[15] 凌玉梅. 空气锤结构设计及冲击破岩仿真[硕士学位论文][D]. 成都：西南石油大学，2010.(LING Yumei. Structural design of air hammer and numerical analysis of air hammer drilling[M. S. Thesis][D]. Chengdu：Southwest Petroleum University，2010.(in Chinese))
[16] 徐小荷，余 静. 岩石破碎学[M]. 北京：煤炭工业出版社，1984：35–55.(XU Xiaohe，XU Jing. Study of rock breaking[M]. Beijing：China Coal Industry Publishing House，1984：35–55.(in Chinese))
[17] 荣 明. 亚弹速钢粒子冲击破岩机制研究[硕士学位论文][D]. 成都：西南石油大学，2010.(RONG Ming. Study on impact-breaking mechanism of steel particles to rock via sub-bullet velocity[M. S. Thesis][D]. Chengdu：Southwest Petroleum University，2010.(in Chinese)) |
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2012, Vol. 31 
