Impact of drilling fluid rheology and wellbore pressure on rock cuttings removal performance: numerical investigation
Abstract
Drilling fluids exhibit non-Newtonian behavior which is generally described in the literature by two rheological models: Power Law and Herschel-Bulkley models. We have used Eulerian- Eulerian multiphase flow model to evaluate the drilling fluid flow patterns and filter cake formation patterns for both models for ultra-deep drilling conditions. Simulated drilling fluid flow patterns clearly show that the Herschel - Bulkley model exhibits fewer vortices around the drilling pipe, indicating better rock cuttings removal performance. In addition to mud rheology, we have analyzed the pressure drop variation with the filter cake formation on the wellbore during ultradeep drilling process. We have shown that filter cake thickness at the wall linearly increases with differential pressure between the well and formation. This implies that the differential pressure needs to be optimized. Very thin filter cake may lead to excessive fluid seepage into the permeable subterranean vertical zone resulting in a loss of fluid circulation and hence in a loss of rock cuttings removal. Yet, very thick filter cake reduces the effective diameter of the hole which may lead to a poor rock cuttings removal performance and stuck pipe. The mathematical model presented here needs to be experimentally validated when filter cake thickness datamore »
- Authors:
-
- National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
- Publication Date:
- Research Org.:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1239132
- Report Number(s):
- NETL-PUB-20218
Journal ID: ISSN 1932-2135
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Asia-Pacific Journal of Chemical Engineering
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 6; Journal ID: ISSN 1932-2135
- Publisher:
- Curtin University of Technology and Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 03 NATURAL GAS; 02 PETROLEUM
Citation Formats
Gamwo, Isaac K., and Kabir, Mohd A. Impact of drilling fluid rheology and wellbore pressure on rock cuttings removal performance: numerical investigation. United States: N. p., 2015.
Web. doi:10.1002/apj.1917.
Gamwo, Isaac K., & Kabir, Mohd A. Impact of drilling fluid rheology and wellbore pressure on rock cuttings removal performance: numerical investigation. United States. https://doi.org/10.1002/apj.1917
Gamwo, Isaac K., and Kabir, Mohd A. Wed .
"Impact of drilling fluid rheology and wellbore pressure on rock cuttings removal performance: numerical investigation". United States. https://doi.org/10.1002/apj.1917. https://www.osti.gov/servlets/purl/1239132.
@article{osti_1239132,
title = {Impact of drilling fluid rheology and wellbore pressure on rock cuttings removal performance: numerical investigation},
author = {Gamwo, Isaac K. and Kabir, Mohd A.},
abstractNote = {Drilling fluids exhibit non-Newtonian behavior which is generally described in the literature by two rheological models: Power Law and Herschel-Bulkley models. We have used Eulerian- Eulerian multiphase flow model to evaluate the drilling fluid flow patterns and filter cake formation patterns for both models for ultra-deep drilling conditions. Simulated drilling fluid flow patterns clearly show that the Herschel - Bulkley model exhibits fewer vortices around the drilling pipe, indicating better rock cuttings removal performance. In addition to mud rheology, we have analyzed the pressure drop variation with the filter cake formation on the wellbore during ultradeep drilling process. We have shown that filter cake thickness at the wall linearly increases with differential pressure between the well and formation. This implies that the differential pressure needs to be optimized. Very thin filter cake may lead to excessive fluid seepage into the permeable subterranean vertical zone resulting in a loss of fluid circulation and hence in a loss of rock cuttings removal. Yet, very thick filter cake reduces the effective diameter of the hole which may lead to a poor rock cuttings removal performance and stuck pipe. The mathematical model presented here needs to be experimentally validated when filter cake thickness data in deep drilling conditions become available. The model could be useful to provide drilling engineers insight on the filter cake formation, drilling fluid flow pattern, and give guide-line to optimize the filter cake as field experimental data are scarce.},
doi = {10.1002/apj.1917},
journal = {Asia-Pacific Journal of Chemical Engineering},
number = 6,
volume = 10,
place = {United States},
year = {Wed Sep 02 00:00:00 EDT 2015},
month = {Wed Sep 02 00:00:00 EDT 2015}
}
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