Quantitative Analysis of Mud Losses in Naturally Fractured Reservoirs: The Effect of Rheology
- Reza Majidi (University of Tulsa) | Stefan Miska (University of Tulsa) | Leslie G. Thompson (University of Tulsa) | Mengjiao Yu (University of Tulsa) | Jianguo Zhang (BP America)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 2010
- Document Type
- Journal Paper
- 509 - 517
- 2010. Society of Petroleum Engineers
- 2 Well Completion, 1.11 Drilling Fluids and Materials, 5.1 Reservoir Characterisation, 5.8.6 Naturally Fractured Reservoir, 1.6 Drilling Operations
- yield-power-law, natural fractures, rheology, lost circulation, mud losses
- 3 in the last 30 days
- 1,350 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 12.00|
|SPE Non-Member Price:||USD 35.00|
Significant fluid loss while drilling through fractured formations is a major problem for drilling operations. From field experience, we know that the type and rheological parameters of the drilling fluid have a strong impact upon the rate and volume of losses.
A mathematical model for Herschel-Bulkley [yield-power-law (YPL)] drilling-fluid losses in naturally fractured formations is presented. As a result, the effect of rheological properties of drilling fluid such as yield stress and shear-thinning/-thickening effect (flow-behavior index) on mud losses in fractured formations is investigated. We found that the yield stress can control the ultimate volume of losses while the shear-thinning effect can tremendously decrease the rate of losses. Therefore, mud losses in fractures can be minimized by optimizing the rheology of the drilling fluid properly.
The model also allows for quantitative analysis of losses that take into account fluid rheology to characterize the fractures. Hydraulic aperture of conductive fractures can be obtained by continuously monitoring mud losses and fitting field records of mud losses to the model. The proposed model is very useful not only for drilling applications but also for well-completion design and fractured-reservoir-characterization purposes. To examine the validity of the model, a practical application of the proposed technique is demonstrated through a field example of mud-loss measurements in a fractured well in the Gulf of Mexico.
|File Size||513 KB||Number of Pages||9|
Beda, G. and Carugo, C. 2001. Use of Mud Microloss Analysis WhileDrilling Improves the Formation Evaluation in Fractured Reservoir. PaperSPE 71737 presented at the SPE Annual Technical Conference and Exhibition, NewOrleans, 30 September-3 October. doi: 10.2118/71737-MS.
Dyke, C.G., Wu, B., and Milton-Tayler, D. 1995. Advances in CharacterizingNatural-Fracture Permeability from Mud-Log Data. SPE Form Eval 10 (3): 160-166. SPE-25022-PA. doi: 10.2118/25022-PA.
Hemphill, T., Campos, W., and Pilehvari, A. 1993. Yield-Power Law Model MoreAccurately Predicts Mud Rheology. Oil & Gas Journal 91(34): 45-50.
Lavrov, A. and Tronvoll, J. 2003. Mud loss into a single fracture duringdrilling of petroleum wells: Modeling approach. In Development andApplication of Discontinuous Modelling for Rock Engineering: Proceedings of the6th International Conference ICADD-6, Trondheim, Norway, 5-8 October 2003,ed. M. Lu, 189. London: Taylor & Francis.
Lavrov, A. and Tronvoll, J. 2004. Modeling Mud Loss in FracturedFormations. Paper SPE 88700 presented at the Abu Dhabi InternationalConference and Exhibition, Abu Dhabi, UAE, 10-13 October. doi:10.2118/88700-MS.
Liétard O., Unwin T., Guillot D., and Hodder M.H. 2002. Fracture WidthLogging While Drilling and Drilling Mud / Loss-Circulation-Material SelectionGuidelines in Naturally Fractured Reservoirs (revised version). SPE Drill& Compl 17 (4): 237-246. SPE-57713-PA.
Liétard, O., Unwin, T., Guillot, D.J., and Hodder, M.H. 1999. Fracture Width Logging While Drillingand Drilling Mud/Loss-Circulation-Material Selection Guidelines in NaturallyFractured Reservoirs. SPE Drill & Compl 14 (3):168-177. SPE-57713-PA. doi: 10.2118/57713-PA.
Majidi, R., Miska, S.Z., Ahmed, R., Yu, M., and Thompson, L.G. 2010. Radial flow ofyield-power-law fluids: Numerical analysis, and experimental study and theapplication for drilling fluid losses in fractured formations. J. Pet.Sci. Eng. 70 (3-4): 334-343.doi:10.1016/j.petrol.2009.12.005.
Raghavan, R. 1993. Well Test Analysis. Englewood Cliffs, New Jersey:Prentice-Hall.
Sanfillippo, F., Brignoli, M., Santarelli, F.J., and Bezzola, C. 1997. Characterization of ConductiveFractures While Drilling. Paper SPE 38177 presented at the SPE EuropeanFormation Damage Conference, The Hague, 2-3 June, 1997.doi:10.2118/38177-MS.
Verga, F.M., Carugo, C., Chelini, V., Maglione, R., and De Bacco, G. 2000.Detection and Characterization ofFractures in Naturally Fractured Reservoirs. Paper SPE 63266 presented atthe SPE Annual Technical Conference and Exhibition, Dallas, 1-4 October. doi:10.2118/63266-MS.