Resumo

HERRERA-OTERO, Edwar; BADILLO-REQUENA, Juan  e  PEREIRA-SANTANA, Zaida Carolina. Determination of turning angle for extraction of plugs from preserved cores using X-ray images tomography. Bol. geol. [online]. 2022, vol.44, n.2, pp.199-210.  Epub 18-Jul-2022. ISSN 0120-0283.  https://doi.org/10.18273/revbol.v44n2-2022010.

The plugs are subsamples extracted from drilling cores, which are used to measure directly the properties associated with the rock and its interactions with the fluid. Any petrophysics model must have laboratory data from the samples to be calibrated. Due to this, it is important that samples are representative and in a good condition. This research proposes a methodology to determine exactly the location of interest points, including the turning angle of the core for its further extraction. This guarantees the integrity and representativeness when the interest zone is selected through well logging. The methodology uses X-ray tomography images on axial, radial, and vertical cuts. It was possible to create equations to measure in scaled images the real dip angle in the cylindric images and vertical cuts. It was also possible to create two nomograms that allow calculating the turning angle of the drilling core, once the dip data of the interest structure is calculated.

Palavras-chave : Plugs; X-ray tomography; Nomogram; Drilling core; Turning angle.

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