| BHA受压失稳的模型及临界钻压公式 |
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| 引用本文： | 张平占.BHA受压失稳的模型及临界钻压公式[J].煤田地质与勘探,1995,23(5):59-62. |
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| 作者姓名： | 张平占 |
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| 作者单位： | 中国矿业大学 |
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| 摘 要： | 在教学及实践中发现，欧拉压杆模型与底部钻具组合（ＢＨＡ）受压失稳模型之间存在较大差别，使用欧拉模型计算钻具的临界失稳钻压有很大的局限性。为此，推导了钻具在自重作用下失稳的临界钻压及临界失稳长度公式，以便使公式更符合ＢＨＡ自身的受力特点，提高计算准确性。
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| 关 键 词： | 欧拉压杆模型 自重失稳 临界钻压 钻具 |
BHA'S STABILITY MODEL AND ITS CRITICAL LOAD |
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| Zhang Pingzhan.BHA''''S STABILITY MODEL AND ITS CRITICAL LOAD[J].Coal Geology & Exploration,1995,23(5):59-62. |
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| Authors: | Zhang Pingzhan |
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| Institution: | China University of Mining & Technology |
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| Abstract: | he auther discovered some significant differences between BHA'S(Bottom hole assembly)stability model and Euler's pressing column model,i.e.Euler's formula may not be reliable in checking theBHA's stabity.SO,the formulas of BHA's critical load and critical length were deduced and given by the hor to fit in with the BHA's loading features as well as to improve the calculating exactness. |
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| Keywords: | Eule's column model BHA unstableness under self-weight critical load critical length |
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