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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
A MATHEMATICAL AND NUMERICAL MODEL TO ESTIMATE THE RATE OF CUTTINGS ACCUMULATION IN WELLBORE BOTTOM DURING SHUTDOUWNS OF FLUID CIRCULATION
Submission Author:
Pablo Enrique Penas , PR
Co-Authors:
Pablo Enrique Penas, Alan Lugarini de Souza, Admilson Franco
Presenter: Pablo Enrique Penas
doi://10.26678/ABCM.ENCIT2020.CIT20-0614
Abstract
During fluid circulation stops in oil and gas wellbore drilling, suspended cuttings will settle towards the bottom. If no action is taken, after some time there is serious risk of drill pipe sticking. Calculating the particle’s settling velocity may be the first step to estimate the cuttings accumulation rate. However, many other factors have to be account for, such as drilling fluid rheology, geological properties and operational conditions prior to the circulation stop. A systematic approach for estimating the cutting accumulation rate is still lacking in the specialized literature. This work presents a simple numerical procedure to calculate the time evolution of the cuttings bed height. The fluids considered are viscoplastic and thixotropic. A series of case studies are provided to assess the model behavior for steady-state and transient cuttings settling. It is expected that this model can assist field engineers in decision making processes.
Keywords
cuttings transport, Particle settling, Thixotropy, stop circulation
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