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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Experimental Evaluation of Interactions Between Column/Drill Bit Set and Cuttings Bed in Drag Force
Submission Author:
Mateus Debiasi , PR
Co-Authors:
Mateus Debiasi, Melissa Kikuchi, Nezia de Rosso, Cezar Otaviano Ribeiro Negrao
Presenter: Mateus Debiasi
doi://10.26678/ABCM.ENCIT2020.CIT20-0306
Abstract
During the removal of the column/drill bit set from a horizontal wellbore the drag force is increased. One of the main reasons is due to the interactions between the set and the cuttings bed. The drag increase may even hold the pipe, causing significant cost increase. The objective of the present work is to evaluate the interactions between the column/drill bit set and the cuttings bed during the set removal from a horizontal well. An experimental rig representing the interest situation was built. The rig's testing section represents a horizontal well constituted of a 140 mm internal diameter acrylic pipe. Inside of it, a 76,2 mm diameter aluminum pipe represents the drill column. Both the pipes are 4 m long. The column displacement speed range is within 1 and 10 cm/s. Also, the column may be rotated in a range of 0 to 150 rpm. In order to evaluate the interactions, the varied parameters were: axial displacement speed, rotation, cuttings bed height and the fluid. It was observed that high displacement speed and column rotation reduces the cuttings volume behind the drill bit and the higher viscosity fluid helps the cuttings transportation.
Keywords
drag force, Cuttings bed, Drill bit/pipe
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