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dc.contributor.authorMazen, Ahmed Z.
dc.contributor.authorRahmanian, Nejat
dc.contributor.authorMujtaba, Iqbal M.
dc.contributor.authorHassanpour, A.
dc.date.accessioned2020-10-21T12:11:14Z
dc.date.accessioned2020-11-05T10:20:09Z
dc.date.available2020-10-21T12:11:14Z
dc.date.available2020-11-05T10:20:09Z
dc.date.issued2021-01
dc.identifier.citationMazen AZ, Rahmanian N, Mujtaba IM et al (2021) Effective mechanical specific energy: A new approach for evaluating PDC bit performance and cutters wear. Journal of Petroleum Science and Engineering. 196: 108030.en_US
dc.identifier.urihttp://hdl.handle.net/10454/18154
dc.descriptionYesen_US
dc.description.abstractPredicting the PDC bit performance during drilling operation is important for the cost effectiveness of the operation. The majority of PDC bits are assessed based on their performance that are relative to offset wells. Determination of mechanical specific energy (MSE) in real time and compare it with the known MSE for a sharp bit to assess the bit life has been utilized by several operators in the past. However, MSE still cannot be used to predict the bit performance in exploration wells and also it cannot assess the bit efficiency in the inner and outer cones. A more precise approach needs to be devised and applied to improve the prediction of bit life and the decision when to pull the bit out of the hole. Effective mechanical specific energy (EMSE) developed in this work is a new wear and performance predictive model that is to measure the cutting efficiency based on number of cutters, which contact the rock as a function of weight on bit (WOB), rotary speed (RPM), torque, and depth of cut (DOC). This model modifies the previous MSE model by incorporating such parameters and including detailed design of the bit, number of blades, cutter density, cutter size, and cutting angle. Using this approach together with the analysis of rock hardness, a level of understanding of how the drilling variables influence the bit performance in the inner and outer cone is improved, and a convenient comparison of the bit condition in the frame of the standard bit record is achieved. This work presents a new simple model to predict the PDC cutters wear using actual data from three sections drilled in three oil wells in Libya. It is found that the obtained results are in well agreement with the actual dull grading shown in the bit record.en_US
dc.language.isoenen_US
dc.publisherElsevier
dc.relation.isreferencedbyhttps://doi.org/10.1016/j.petrol.2020.108030en_US
dc.rights© 2020 Elsevier B.V. All rights reserved. . Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.en_US
dc.subjectMechanical specific energyen_US
dc.subjectPDC bit performanceen_US
dc.subjectPDC bit wearen_US
dc.subjectDepth of cuten_US
dc.subjectBit profileen_US
dc.titleEffective mechanical specific energy: A new approach for evaluating PDC bit performance and cutters wearen_US
dc.status.refereedYesen_US
dc.date.Accepted2020-10-12
dc.date.application2020-10-19
dc.typeArticleen_US
dc.date.EndofEmbargo2021-10-20
dc.type.versionAccepted manuscripten_US
dc.description.publicnotesThe full-text of this article will be released for public view at the end of the publisher embargo on 20 Oct 2021.en_US
dc.date.updated2020-10-21T11:11:21Z
refterms.dateFOA2020-11-05T10:20:41Z


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