The Rheological Properties of Oil-Based Mud under High Pressure and High Temperature Conditions
Designing a proper drilling fluid that can function properly under the conditions of High-Pressure, High-Temperature (HP/HT) operations is very challenging. Among these challenges is the alteration of the rheological properties of drilling fluid due to the high temperature and high pressure (Ibeh et. al, 2007). This work investigates the rheological behavior of oil-based drilling fluids with different properties at Ultra-HP/HT conditions using a state-of-the-art viscometer capable of measuring drilling fluids properties up to 600°F and 40,000 psi. For this purpose, two actual oil based mud samples used by industry with the same mud weight (12.5 ppg) were chosen to carry out a matrix of experiments. The results of this study led to concluding that the viscosity, yield point and gel strength decrease with increasing temperature (until the mud sample fails, for oil-based mud with regular formulation). This behavior is the result of the thermal degradation of the solid, polymers, and other components of the mud samples and the expansion of the molecular distances which will lower the resistance of the fluid to flow and, hence, its viscosity, yield point, and gel strength. Moreover, it is concluded that the viscosity and yield point increase as the pressure increases. Pressure’s effect on these parameters, however, is more apparent at low temperature (below failure point, for oil-based mud with regular formulation).
Key words: High pressure high temperature; Oil-based mud; Rheology; Rheological properties
 Alderman, N., Gavignet, A., & Guillot, D. (1988). High-Temperature, High-Pressure Rheology of Water-Based Muds. Paper SPE 18035, presented at the SPE 63rd Annual Technical Conference and Exhibition, Houston, Texas, 2-5 October, SPE 18035.
 Bland, R., Mullen, G., Gonzalez, Y., Harvey, F., & Pless, M. (2006). HPHT Drilling Fluid Challenges. Presented at IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, 13-15 November 2006, Bangkok, Thailand.
 Gusler, W., Pless, M., & Maxey, J. et al. (2007). A New Extreme-HP/HT Viscometer for New Drilling-Fluid Challenges. Paper SPE 99009, SPE Drilling & Completion, June, SPE 99009.
 Ibeh, C.S. (2007). Investigation on the Effect of Ultra-High Pressure and Temperature on the Rheological Properties of Oil-Based Drilling Fluids. MS Thesis, Texas A&M U., College Station, Texas.
 Ibeh, C., Schubert, J., & Teodoriu, C. (2008). Investigation on the effect of Ultra-High Pressure and Temperature on the Rheological Properties of Oil-Based Drilling Fluids. Presented at 2008 AADE Conference and Exhibition, Houston, Texas.
 Lee, J., & Shadravan, A. (2012). Rheological Properties of Invert Emulsion Drilling Fluid Under Extreme HPHT Conditions. Paper IADC/SPE 151413, presented at IADC/SPE Drilling Conference and Exhibition, 6-8 March 2012, San Diego, California.
 Shaughnessy, J.M., & Locke, H.A. (2000). 20-Plus Years of Tuscaloosa Drilling: Continuously Optimizing Deep HTHP Wells. Paper IADC/SPE 59181-MS, presented at ADC/SPE Drilling Conference, 23-25 February 2000, New Orleans, Louisiana.
 Wang, H., & Su, Y. N. (2000). High Temperature & High Pressure (HTHP) Mud P-ρ-T Behavior and Its Effect on Wellbore Pressure Calculations. Paper IADC/SPE 59266-MS, presented at at ADC/SPE Drilling Conference, 23-25 February 2000, New Orleans, Louisiana.
- There are currently no refbacks.
If you have already registered in Journal A and plan to submit article(s) to Journal B, please click the CATEGORIES, or JOURNALS A-Z on the right side of the "HOME".
We only use three mailboxes as follows to deal with issues about paper acceptance, payment and submission of electronic versions of our journals to databases:
email@example.com; firstname.lastname@example.org; email@example.com
Copyright © 2010 Canadian Research & Development Centre of Sciences and Cultures
Address: 730, 77e AV, Laval, Quebec, H7V 4A8, Canada
Telephone: 1-514-558 6138