Prediction of casing wear in extended-reach drilling |
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Authors: | Deli Gao Lianzhong Sun Jihong Lian |
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Affiliation: | 1. Key Laboratory of Petroleum Engineering,Ministry of Education,China University of Petroleum,Beijing 102249,China 2. CACT Operators Group,Shenzhen,Guangdong 518069,China |
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Abstract: | Intermediate casings in the build sections are subject to severe wear in extended-reach drilling. This paper presents a new
method for predicting the depth of a wear groove on the intermediate casing. According to energy principle and dynamic accumulation
of casing wear by tool joints, a model is established to calculate the wear area on the inner wall of the casing. The relationship
functions between the wear groove depth and area are obtained based on the geometry relationship between the drillstring and
the wear section and the assumption that the casing wear groove is crescent-shaped. The change of casing wear groove depth
versus drilling footage under different-sized drillstrings is also discussed. A mechanical model is proposed for predicting
casing wear location, which is based on the well trajectory and drillstring movement. The casing wear groove depth of a planned
well is predicted with inversion of the casing wear factor from the drilled well and necessarily revised to improve the prediction
accuracy for differences between the drilled well and the planned well. The method for predicting casing wear in extended-reach
drilling is verified through actual case study. The effect of drillstring size on casing wear should be taken into account
in casing wear prediction. |
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Keywords: | Extended-reach drilling casing wear casing wear location inversion calculation |
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