Measuring and testing – Borehole or drilling – Formation logging
Reexamination Certificate
2000-09-27
2002-02-26
Williams, Hezron (Department: 2856)
Measuring and testing
Borehole or drilling
Formation logging
C073S081000
Reexamination Certificate
active
06349595
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates generally to the field of wellbore drilling. More specifically, the invention relates to methods for selecting the type of drill bit used, and the drilling parameters used to drill a wellbore so as to optimize the overall drilling performance.
2. Description of the Related Art
Methods known in the art for selecting the type of drilling bit are typically based on analysis of data related to the drilling performance achieved on previously drilled wells in the vicinity of the wellbore being drilled (called “offset wells”), and are based on monitoring and analysis of dull (“worn out”) drill bits. Other methods known in the art for bit selection include methods for simulating (“modeling”) the formation “drillability” and other drilling performance parameters. The drillability of earth formations is related to mechanical properties of the formations, in particular the compressive strength. Knowledge of the mechanical properties is useful to optimize the drilling of the formations. One well known method to determine compressive strength is based on acoustic (“sonic”) well log interpretation combined with lithological analysis of formation data. Even though it is sufficiently reliable to calculate rock strength, the prior art method has two limitations: first, that the compressive strength is derived in this method from elastic theory, relating the rock acoustic responses to rock hardness, therefore the measurement is not a direct determination of strength; and second, that the acoustic log is recorded after the formation is completely drilled, and is therefore not useful for predictive analysis in the particular wellbore being drilled.
SUMMARY OF THE INVENTION
The invention is a method for selecting at least one drilling parameter for drilling a wellbore through earth formations. The method includes determining a loading displacement relationship of samples of earth formations from measurements of loading displacement made on the samples by an indenter. The at least one drilling parameter is selected from the loading displacement relationship thus determined.
In one embodiment of the invention, the loading displacement relationship is determined from drill cuttings made during the drilling of a wellbore. The relationship thus determined during drilling is used to select the at least one drilling parameter during drilling of the wellbore to improve drilling performance.
Drilling parameters which can be selected by the method of the invention include, but are not limited to, mill tooth and/or insert bit type when roller cone drill bits are used; whether and what type of gauge protection is to be used on the drill bit; type, size and orientation of jet nozzles to be included on the drill bit; and where fixed cutter bits are used, the blade structure, cutter type and density as well as the cutter impact resistance can be selected. Other drilling parameters which can be selected using the method of the invention include weight on bit, drill bit rotation rate, and drilling fluid flow rate.
In a particular embodiment of the invention, values of a slope of displacement with respect to applied force for the loading displacement measurements on each of the samples are characterized with respect to a measured compressive strength for each of the samples. The characterization is used in this embodiment to determine a compressive strength for samples of rock during drilling of the wellbore.
REFERENCES:
patent: 5318136 (1994-06-01), Rowsell et al.
patent: 5416697 (1995-05-01), Goodman
patent: 5704436 (1998-01-01), Smith et al.
patent: 5730234 (1998-03-01), Putot
patent: 5794720 (1998-08-01), Smith et al.
patent: 5812068 (1998-09-01), Wisler et al.
patent: 6002985 (1999-12-01), Stephenson
patent: 6012015 (2000-01-01), Tubel
patent: 6021377 (2000-02-01), Dubinsky et al.
patent: 6044325 (2000-03-01), Chakravarthy et al.
patent: 6109368 (2000-08-01), Goldman et al.
Thiercelin, M. and Cook, J.: “Failure Mechanisms Induced by Indentation of Porous Rocks”. Key Questions in Rock Mechanics, pp. 135-142, 1988.
Cook, J.M. and Thiercelin, M.: “Indentation Resistance of Shale: the Effects of Stress State and Strain Rate”. Rock Mechanics as a Guide for Efficient Utilization of Natural Resources, pp. 757-764, 1989.
Thiercelin, M.: “Parameters Controlling Rock Indentation”-Rock at Great Depth, Proc. ISRM/SPE Symp., pp. 85-92, 1989.
Suarez-Rivera, F.R., Cook, N.G.W., Cooper, G.A., Zheng, Z.: “Indentation by Pore Collapse in Porous Rocks”-Rock Mechanics Contributions and Challenges, pp. 671-678, 1990.
Suarez-Rivera, F.R., Cook, P.J., Cook, N.G.W., Myer, L.R.: “The Role of Wetting Fluids During the Indentation of Porous Rocks”-Rock Mechanics as a Multidisiplinary Science, Proc. 32nd U.S. Symp., pp. 683-692, 1991.
Zuasa, F. and Santarelli, F.J.: “A New Method to Determine Rock Strength from an Index Test on Fragments of Very Small Dimension”. VIII ISRM International Congress on Rock Mechanics, Tokyo, Japan, pp. 114-117, 1995.
Ringstad, C., Loftus, E.B. Sonstebo, E.F., Fjaer, E., Zausa, F. and Giin-Fa Fuh: “Prediction of Rock Parameters from Micro-Indentation Measurements: The Effect of Sample Size”. Paper SPE 47313 SPE/ISRM-EUROCK '98, pp. 487-492, Trondheim Jul. 8-10, 1998.
Santarelli, F.J., Detienne, J.L., Zundel, J.P.: “The Use of a Simple Index Test in Petroleum Rock Mechanics”, Rock Mechanics as a Multidisiplinary Science, Proc. 32nd U.S. Symp., pp. 647-655, 1991.
Santarelli, F.J., Marsala, A.F., Brignoli. M., Rossi E. and Bona N.: “Formation Evaluation from Logging on Cuttings”. Paper SPE 36851, Proc. Eur. Petrol. Conf. (Milano), pp. 319-329, 1996.
Zausa, F., Civolani, L., Brignoli, M. and Santarelli, F.J.: “Real Time Wellbore Stability Analysis at the Rig-Site”. Paper SPE/IADC 37670-SPE/IADC Drilling Conference, Amsterdam, The Netherlands, pp. 837-846, Mar. 4-6, 1997.
Mason, K.L.: “Three-Cone Bit Selection With Sonic Logs”, SPE Drilling Engineering, vol. 2, No. 1; pp. 1, 135-142, 1987.
Carter, J.A. and Akins, M.E.: “Dome PDC Technology Enhances Slim-Hole Drilling and Underreaming in the Permian Basin”. Paper SPE 24606, 67th Annual Technical Conference & Exhibition of the Society of Petroleum Engineers; Washington, D.C.; pp. 645-665, 1992.
Moran, D.P.: “Dome Shaped PDC Cutters Drill Harder Rock Effectively”. Oil and Gas Journal, vol. 90, No. 50; pp. 46-51, 1992.
Carminati, S., Del Gaudio, L., Zausa, F., and Brignoli, M.: “Hoe do Anions in Water Based Muds Affect Shale Stability”. Paper SPE 50712. SPE International Symposium on Oilfield Chemistry., Houston, Texas, pp. 119-131, Feb. 16-19, 1999.
Jeff S. Arbogast and Mark H. Franklin, “Artificial Neural Networks and High-Speed Resistivity Modeling . . . Poweful New Exploration and development Tools”; Hart's Petroleum Engineer International Magazine (in two parts), May and Jun., 1999.
D. Dashevskly et al. “Application of Neural Networks for Predictive Control in Drilling Dynamics”; Society of Petroleum Engineers 56442, 1999 SPE Annual Technology Conference and Exhibition, Houston, Texas; Oct. 3-6, 1999.
Printed internet site entitled “DBOS SERVICES Drill Bit Optimization System”, Printed Mar. 1, 2001, 2 pages www.geodiamond.com/dbos/dboxhome.htm.
Printed internet site entitled “SINTEF Petroleum Research, Indirect Determination of USC”, Printed Jan. 30, 2001, 2 pages, www.iku.sinteff.no/Formtys/activities/Cuttings/page4.htm.
Civolani Lorenzo
Zausa Fabrizio
Politzer Jay L.
Rosenthal & Osha L.L.P.
Smith International Inc.
Williams Hezron
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