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| Stability of drilling string considering gravity in inclined well |
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TANG Bo1,WANG Min-sheng1,2
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(1. Drilling Technology Research Institute, Shengli Petroleum Administrative Bureau, Dongying 257017, China;2.College of Petroleum Engineering in China University of Petroleum, Dongying 257061，China)
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| Abstract: |
| The axis load is function of angle of inclination, frictional coefficient and weight of drill string in drilling fluid. The function was applied to the flexure equations of drilling string and solved by infinite series method. And the relationship between the coefficient of string length and coefficient of critical buckling pressure was determined. The results show that the coefficient of critical buckling pressure will be a constant if the coefficient of string length increases. The buckling will easily occur while drilling, so it is necessary to calculate the buckling during calculating the torque and drag of string. |
| Key words: inclined well drilling string buckling critical load |
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