Casing Burst Stresses in Particulate-Filled Annuli: Where Is the Cement?
- Issa A. Kalil (Altus Well Experts, Incorporated) | Albert R. McSpadden (Altus Well Experts, Incorporated)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 2012
- Document Type
- Journal Paper
- 473 - 485
- 2012. Society of Petroleum Engineers
- 1.14.3 Cement Formulation (Chemistry, Properties), 1.14 Casing and Cementing, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties)
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- 613 since 2007
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For burst design, engineers routinely assume that the casing annular space is filled by a fluid equivalent. This assumption ignores mechanical resistance provided by solid cement. Some studies addressed this shortcoming by modeling the cement sheath as a solid with elastic failure criteria. Prior work used cement elastic modulus and Poisson's ratio to classify cement as "ductile" (soft) or "brittle" (hard). In the current study, numerical results from finite-element analysis (FEA) indicate that casing burst resistance is increased by the presence of the cement sheath. This study focuses solely on improvement offered by the cement sheath to casing burst resistance and ignores consequences of cement failure on overallwell integrity. Comparisons are provided for casing burst resistance, assuming various backup profiles. These include fluid hydrostatics, solid cement matrix (both elastic and plastic response), and cement as "loose" particles. The fluid hydrostatics include mud weight in hole, cement-slurry density, mixed-water density; normal pressure (saltwater column), and actual pore pressure. Calculations show that these fluid profiles are conservative when used as burst-resistance backup. Original cement-slurry density is least conservative. Because well designers are familiar with fluid profile backup assumptions in casing burst design, recommendations are provided to approximate cement behavior as particles with a fluid profile. This allows ease of calculation and is consistent with current practice. Guidelines are provided to explicitly calculate the enhanced casing burst resistance caused by the particulate cement.
|File Size||1 MB||Number of Pages||13|
Abaqus/CAE User's Manual 2009. Providence, Rhode Island:Dassault Systèmes Simulia Corporation. http://www.simulia.com.
Bourgoyne, A.T., Jr., Chenevert, M.E., Millheim, K.K., et al. 1991.Applied Drilling Engineering, Vol. 2. Richardson, Texas: TextbookSeries, SPE.
Fleckenstein, W.W., Eustes, A.W., III, Miller, M.G. 2001. Burst-InducedStresses in Cemented Wellbores. SPE Drill & Compl 16(2): 74-82. http://dx.doi.org/10.2118/72059-PA.
Gray, K.E., Podnos, E., Becker, E. 2007. Finite Element Studies ofNear-Wellbore Region During Cementing Operations: Part I. Paper SPE 106998presented at SPE Production and Operations Symposium, Oklahoma City, Oklahoma,March 31-April 3. http://dx.doi.org/10.2118/106998-MS.
Hills, J.O. 1939. Design of Casing Programs: Drilling and ProductionPractices. Washington DC: American Petroleum Institute.
Last, N., Mujica, S., Pattillo, P., et al. 2002. Casing Deformation in aTectonic Setting: Evaluation, Impact and Management. IADC/Paper SPE 74560presented at IADC/SPE Drilling Conference, Dallas, Texas, February 26-28. http://dx.doi.org/10.2118/74560-MS.
Mitchell, R.F. 2007. Petroleum Engineering Handbook: Volume II: DrillingEngineering. Richardson, Texas: Society of Petroleum Engineers.
Oberg, C.H., and Masters, R.W. 1947. The Determination of Stresses inOil-Well Casing in Place. In Drilling and Production Practices.Washington DC: American Petroleum Institute.
Pattillo, P.D., Last, N.C., Asbill, W.T. 2003. Effect of Non-Uniform Loadingon Conventional Casing Collapse-Resistance. IADC/Paper SPE 79871 presented atIADC/SPE Drilling Conference, Amsterdam, The Netherlands, February 19-21. http://dx.doi.org/10.2118/79871-MS.
Pattillo, P.D., Moschovidis, Z.A., Lal, M. 1995. An Evaluation of ConcentricCasing for Nonuniform Load Applications. SPE Drill & Compl 10 (3): 186-192. http://dx.doi.org/10.2118/29232-PA.
Prentice, C.M. 1970. "Maximum Load" Casing Design. J. Pet Tech 22 (7): 805-811. http://dx.doi.org/10.2118/2560-PA.
Rodriguez, W.J., Fleckenstein, W.W., Eustes, A.W. 2003. Simulation ofCollapse Loads on Cemented Casing Using Finite Element Analysis. Paper SPE84566 presented at SPE Annual Technology Conference and Exhibition, Denver,Colorado, October 5-8. http://dx.doi.org/10.2118/84566-MS.
Vorenkamp, A.P.A. 1988. A Theory of Resultant Burst Loads for DesigningProduction Casing: Principally in Abnormally Pressured Wells. Paper SPE 17178presented at SPE/IADC Drilling Conference, Dallas, Texas, February 28-March 2.http://dx.doi.org/10.2118/17178-MS.
Zinkham, R.E., and Goodwin, R.J. 1962. Burst Resistance of Pipe CementedInto the Earth. Paper SPE 291 J. Pet Tech 14 (9):1033-1040. http://dx.doi.org/10.2118/291-PA.