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    Estimation of Dulling Rate and Bit Tooth Wear Using Drilling Parameters and Rock Abrasiveness

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    Publication date
    2019
    Author
    Mazen, Ahmed Z.
    Rahmanian, Nejat
    Mujtaba, Iqbal M.
    Hassanpour, A.
    Keyword
    Rate of dulling
    Bit wear
    Mechanical specific energy
    Rate of penetration
    Rotary speed
    Peer-Reviewed
    Yes
    
    Metadata
    Show full item record
    Abstract
    Optimisation of the drilling operations is becoming increasingly important as it can significantly reduce the oil well development cost. One of the major objectives in oil well drilling is to increase the penetration rate by selecting the optimum drilling bit based on offset wells data, and adjust the drilling factors to keep the bit in good condition during the operation. At the same time, it is important to predict the bit wear and the time to pull out the bit out of hole to prevent fishing jobs. Numerous models have been suggested in the literature for predicting the time to pull the bit out to surface rather than predict or estimate the bit wear rate. Majority of the available models are largely empirical and can be applied for limited conditions, and do not include all the drilling parameters such as the formation abrasiveness and bit hydraulic. In this paper, a new approach is presented to improve the drill bit wear estimation that consists of a combination of both Bourgoyne and Young (BY) drilling rate model and theory of empirical relation for the effects of rotary speed (RPM), and weight on bit (WOB) on drilling arte (ROP) and rate of tooth wear. In addition to the drilling parameters, the formation abrasiveness and the effect of the jet impact force of the mud have also been accounted to estimate the bit wear. The proposed model enables estimation of the rock abrasiveness, and that lead to calculate the dynamic dulling rate of the bit while drilling that used in more accurate to assess the bit tooth wear compared with the mechanical specific energy (MSE). Then the estimated dulling rate at the depth of pulling out is used to determine the dull grade of the bit. The technique is validated in five wells located in two different oil fields in Libya. All studied wells in this showed a good agreement between the actual bit tooth wear and the estimated bit tooth wear.
    URI
    http://hdl.handle.net/10454/17485
    Version
    No full-text in the repository
    Citation
    Mazen AZ, Rahmanian N, Mujtaba IM et al (2019) Estimation of Dulling Rate and Bit Tooth Wear Using Drilling Parameters and Rock Abrasiveness. Journal of Petroleum Engineering and Technology. 9(3): 1-12.
    Link to publisher’s version
    http://engineeringjournals.stmjournals.in/index.php/JoPET/article/view/3337
    Type
    Article
    Collections
    Engineering and Informatics Publications

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