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| The Contact Frictional Resistance Analysis of the Drillstring in the Horizontal Well of Long and Middle Radius |
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| DOI：10.7511/jslx19933056 |
| KeyWord:horizontal well of long and middle radius, drillstring, contact frictional resistance, gap element |
| Liu Jubao Zhang Xuehong Fan Xianmei |
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| Abstract: |
| In the horizontal well of long and middle radius, the drillstring of several thousand meters is in random contact with the bore hole wall in a large area along the well depth, which is a nonlinear contact problem. It is solved by the gap element method[1] in this paper so that the contact state is accurately described and the contact frictional resistance of drillstring is calculated. A great number of calculation examples for engineering have shown that the gap element method may correctly describe the contact state between the drillstring and the hole well, and possess a better calculation accuracy and convergence, which provide the effective method for analyzing the contact frictional resistance of the drillstring in horizontal well. |
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