| 摘要: |
| 基于钻柱振动与井壁摩阻间的耦合作用研究,依据弹性杆理论,建立大斜度井激发钻柱产生轴向振动减小摩阻的数学模型,分析激振力强度、激振频率、摩阻系数和钻井液黏滞系数对钻柱振动减阻效果的影响。采用正交数值试验对各因素的影响程度进行分析。结果表明:提高激振力强度、频率或降低摩阻系数和钻井液黏滞系数均可提高振动减阻效果,其中激振频率存在最优值;各因素对钻柱振动减阻效果的影响由大到小依次为激振器强度、摩阻系数、激振器频率和钻井液黏滞系数。 |
| 关键词: 斜井 钻柱振动 振动减阻 正交试验 参数优选 |
| DOI：10.3969/j.issn.1673-5005.2014.04.013 |
| 分类号::TE 821 |
| 基金项目:国家自然科学基金项目(51374234,7);国家“973”重大项目(2010CB226703-1);中国石油大学研究生创新基金项目(YCX2014008) |
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| Influence laws of modulated vibration on friction reduction in inclined-wells |
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WANG Peng1, NI Hongjian1, WANG Ruihe1, SHEN Zhonghou1, LI Zhina2, LEI Peng1
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(1.School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2.School of Geosciences in China University of Petroleum, Qingdao 266580, China)
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| Abstract: |
| By coupling vibration of drill string and friction of borehole, a mathematic model was established according to the elastic rod theory to investigate the friction reduction caused by axial vibration of drill string during jarring in highly inclined-wells. This model was used to analyze the influences of the intensity of vibration force, vibration frequency, friction coefficient and the drilling fluid viscosity on the friction reduction effect. Orthogonal experiment was used to analyze the magnitude of the effects from those factors. The results show that improving the excitation intensity and frequency or reducing the friction coefficient and drilling fluid viscosity coefficient can effectively help friction reduction, and there is an optimum value for excitation frequency. Regarding to friction reduction effect magnitude, excitation intensity ranks the highest, and then come friction coefficient, excitation frequency and fluid viscosity coefficient. |
| Key words: inclined-wells drill string vibration friction reduction by vibration orthogonal experiment parameters optimization |
