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| A Study of Dynamics of the Spinning Drillstring in Annul us |
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| DOI：10.7511/jslx19933049 |
| KeyWord:contact ,annalus,drill string ,wellwall,unknown boundary |
| Liu Yanqiang |
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| Abstract: |
| The mechanics of contact between working drillstring in annulus and wellwall is analysed, and a general model of dynamic friction contact between drillstring and wellwall is established, and a computation method of solving unknown boundary problem and dynamic analysis of drillstring is advanced. The computations show that there are different contact forms between drillstring and wellwall in different working conditions. |
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