Cement Shrinkage Measurement in Oilwell Cementing--A Comparative Study of Laboratory Methods and Procedures
- B.R. Reddy (Halliburton) | Ying Xu (Halliburton) | Kris Ravi (Halliburton) | Dennis W. Gray (Halliburton) | Phillip Pattillo (BP America)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- March 2009
- Document Type
- Journal Paper
- 104 - 114
- 2009. Society of Petroleum Engineers
- 1.6 Drilling Operations, 1.14.3 Cement Formulation (Chemistry, Properties), 5.2 Reservoir Fluid Dynamics, 1.14 Casing and Cementing, 3 Production and Well Operations, 5.3.2 Multiphase Flow, 1.11 Drilling Fluids and Materials, 4.6 Natural Gas, 4.3.1 Hydrates, 5.1.1 Exploration, Development, Structural Geology, 5.1 Reservoir Characterisation
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- 1,487 since 2007
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Cement-sheath shrinkage after placing the cement slurry in the annulus has been of concern in oilwell cementing because of the potential detrimental effects that shrinkage can have on long-term zonal isolation.
This paper compares several methods for measuring cement shrinkage under a variety of conditions including those downhole. Using the various methods, cement shrinkage in environments where the cement slurry is either closed to or open to external water sources was measured, and the values were compared. The methods used for measurement under atmospheric conditions were based on American Petroleum Institute (API) test apparatus (balloon and ring mold) and flask methods currently used in laboratories. Measurements under pressure were performed using the balloon and ring-mold methods, in-house designed equipment, and commercial equipment.
The values obtained by the different methods are discussed. Procedure modifications are proposed for measuring volume changes to cement slurries on the basis of placement time, shear history, and gel-strength development.
The results presented in this work can be used to test shrinkage characteristics of cement slurries in the laboratory under downhole conditions and to select a cement system that is fit for purpose.
The main purpose of a primary cementing job is to provide effective zonal isolation for the life of the well so that oil and gas can be produced safely and economically. In recent years, the number of wells with annular pressure worldwide has increased significantly. The extent of the problem related to annular pressure buildup in Gulf of Mexico wells has been reported recently (Bourgoyne et al. 1998).
From a cementing perspective, a path for fluid migration could be created if drilling fluid is not effectively displaced; if cement slurry is not placed in the entire annulus; and/or if the cement sheath fails, either because of shrinkage and/or because of loss of structural integrity from its lack of capacity to withstand stresses from well operations. The current discussion focuses on the contribution to near-term cement sheath failure from shrinkage. A number of papers have been written about cement shrinkage, particularly its measurement methods for oilwell cement slurries (Root and Calvert 1971; Beirute and Tragesser 1973; Parcevaux and Sault 1984; Chenevert and Shrestha 1991; Keating et al. 1989; Moran et al. 1991; Ghofrani and Plack 1993; Justnes et al. 1995; API TR 10TR2 1997; Baumgarte et al. 1999; Backe et al. 1999; Cementing Solutions 2002; Goboncan and Dillenbeck 2003; Jennings 2005; Ravi et al. 2006). Cement-sheath failure to provide zonal isolation because of shrinkage may be a result of volumetric shrinkage leading to debonding and microannulus formation between the cement sheath and casing or formation, tensile cracks and subsequent increased permeability resulting from shrinkage stresses, or both causes.
The phenomenon of cement shrinkage in oilwell cement slurries during and after the cementing operation has two component: the theoretical volume changes based on the volume of products and volume of reactants, and the bulk-volume change. The absolute volume of the products formed is less than the volume occupied by the reactants (i.e., cement and water). This phenomenon is referred to as hydration-volume shrinkage, total (internal) shrinkage, chemical shrinkage, or simply hydration shrinkage. A small percentage of the theoretically possible total shrinkage manifests itself as volume reduction, referred to as bulk shrinkage or autogenous shrinkage.
The current discussion addresses issues related to quantification of dimensional changes to the cement formulation during the early stages of cement hydration when the rate of shrinkage is high.
|File Size||1 MB||Number of Pages||11|
API RP 10B-5, Recommended Practice on Determination of Shrinkage andExpansion of Well Cement Formulations at Atmospheric Pressure, firstedition. 2005. Washington, DC: API.
API TR 10TR2, Shrinkage and Expansion in Oilwell Cements, firstedition. 1997. Washington, DC: API.
Backe, K.R., Lile, O.B., Lyomov, S.K., Elvebakk, H., and Skalle, P. 1999. Characterizing Curing Cement Slurriesby Permeability, Tensile Strength, and Shrinkage. SPE Drill &Compl 14 (3): 162-167. SPE-57712-PA. DOI:10.2118/57712-PA.
Baroghel-Bouny, V., Mounanga, P., Khelidj, A., Loukili, A., and Rafai, N.2006. Autogenousdeformations of cement pastes: Part II. W/C effects, micro-macro correlations,and threshold values. Cement and Concrete Research 36(1): 123-136. DOI:10.1016/j.cemconres.2004.10.020.
Baumgarte, C., Thiercelin, M., and Klaus, D. 1999. Case Studies of Expanding Cement toPrevent Microannular Formation. Paper SPE 56535 presented at the SPE AnnualTechnical Conference and Exhibition, Houston, 3-6 October. DOI:10.2118/56535-MS.
Beirute, R. and Tragesser, A. 1973. Expansive and ShrinkageCharacteristics of Cements Under Actual Well Conditions. J. Pet Tech25 (8): 905-909. SPE-4091-PA. DOI: 10.2118/4091-PA.
Bentz, D., Jensen, O.M., Hansen, K.K., Olesen, J.F., Stang, H., and Haecker,C.-J. 2001. Influence of Cement Particle-Size Distribution on Early AgeAutogenous Strains and Stresses in Cement-Based Materials. J. Am. Ceram.Soc. 84 (1): 129-135.
Boivin, S., Acker, P., Rigaud, S., and Clavaud, B. 1999. Experimentalassessment of chemical shrinkage of hydrating cement pastes. In AutogenousShrinkage of Concrete, ed. Ei-ichi Tazawa, Chap. 2, 81-92. London: E &FN Spon (Routledge).
Bourgoyne, A.T. Jr., Scott, S.L., and Manowski, W. 1998. A review ofsustained casing pressure occurring on the OCS. LSU Report, Contract No.14-35-001-30749, Minerals Management Services, US DOI, Washington, DC.
Cementing Solutions, Inc. (CSI). 2002. Long-term integrity of deepwatercement systems under stress/compaction conditions. Project Report 3, MMS, USDOI, Washington, DC (19 November 2002).
Chenevert, M.E. and Shrestha, B.K. 1991. Chemical Shrinkage Properties ofOilfield Cements. SPE Drill Eng 6 (1): 37-43.SPE-16654-PA. DOI: 10.2118/16654-PA.
Ghofrani, R. and Plack, H. 1993. CaO- and/or MgO-Swelling Cements: AKey for Providing a Better Annular Sealing? Paper SPE 25697 presented atthe SPE/IADC Drilling Conference, Amsterdam, 22-25 February. DOI:10.2118/25697-MS.
Goboncan, V.C. and Dillenbeck, R.L. 2003. Real-Time Cement Expansion/ShrinkageTesting Under Downhole Conditions for Enhanced Annular Isolation. Paper SPE79911 presented at the SPE/IADC Drilling Conference, Amsterdam, 19-21 February.DOI: 10.2118/79911-MS.
Holt, E. 2005. Contribution ofmixture design to chemical and autogenous shrinkage of concrete at earlystages. Cement and Concrete Research 35 (3): 464-472.DOI:10.1016/j.cemconres.2004.05.009.
ISO 10426-5:2004, Petroleum and natural gas industries--Cements andmaterials for well cementing--Part 5: Determination of shrinkage and expansionof well cement formulations of atmospheric pressure. 2004. Geneva,Switzerland: ISO.
Jennings, S.S. 2005. Long-TermHigh-Temperature Laboratory Cement Data Aid in the Selection of OptimizedCements. Paper SPE 95816 presented at the SPE Annual Technical Conferenceand Exhibition, Dallas, 9-12 October. DOI: 10.2118/95816-MS.
Justnes, D., van Loo, D., Reyniers, B., Skalle, P., Sveen, J., andSellevold, E.J. 1995. Chemical shrinkage of oil well cement slurries.Advances in Cement Research 7 (26): 85-90.
Justnes, H., Van Gemert, A., Verboven, F., and Sellevold, E.J. 1996. Totaland external chemical shrinkage of low w/c ratio cement pastes. Advances inCement Research 8 (31): 121-126.
Keating, J., Hannant, D.J., and Hibbert, A.P. 1989. Correlation between cubestrength, ultrasonic pulse velocity and volume change for oil well cementslurries. Cement and Concrete Research 19 (5): 715-726.DOI:10.1016/0008-8846(89)90042-2.
Moran, L.K., Murray, T.R., and Moyer, W.R. 1991. Cement Expansion: A LaboratoryInvestigation. Paper SPE 21685 presented at the SPE Production OperationsSymposium, Oklahoma City, Oklahoma, USA, 7-9 April. DOI: 10.2118/21685-MS.
Mounanga, P., Baroghel-Bouny, V., Loukili, A., and Khelidj, A. 2006. Autogenousdeformations of cement pastes: Part I. Temperature effects at early age andmicro-macro correlations. Cement and Concrete Research36 (1): 110-122. DOI:10.1016/j.cemconres.2004.10.019.
Mounanga,P., Khelidj, A., Loukili, A., and Baroghel-Bouny, V. 2004.Predicting Ca(OH)2 content and chemical shrinkage of the hydratingcement pastes using analytical approach. Cement and Concrete Research34 (2): 255-265.
Parcevaux, P.A. and Sault, P.H. 1984. Cement Shrinkage and Elasticity: ANew Approach to a Good Zonal Isolation. Paper SPE 13176 prepared forpresentation at the SPE Annual Technical Conference and Exhibition, Houston,16-19 September. DOI: 10.2118/13176-MS.
Ravi, K., Reddy, BR., Gray, D., and Pattillo, P. 2006. Procedures tooptimize cement systems for specific well conditions. Paper AADE-06-DF-HO-35presented at the AADE 2006 Fluids Conference, Houston, 11-12 April.
Reddy, B.R., Xu, Y., Ravi, K., Gray, D., and Pattillo, P.D. 2007. Cement Shrinkage Measurement inOilwell Cementing--A Comparative Study of Laboratory Methods andProcedures. Paper SPE 103610 presented at the Rocky Mountain Oil and GasTechnology Symposium, Denver, 16-18 April. DOI: 10.2118/103610-MS.
Root, R.L. and Calvert, D.G. 1971. The Real Story of CementExpansion. Paper SPE 3346 presented at the SPE Rocky Mountain RegionalMeeting, Billings, Montana, USA, 2-4 June. DOI: 10.2118/3346-MS.
Sabins, F.L. and Sutton, D.L. 1991. Interrelationship Between CriticalCement Properties and Volume Changes During Cement Setting. SPE DrillEng 6 (2): 88-94; Trans., AIME, 291.SPE-20451-PA. DOI: 10.2118/20451-PA.
Sun, Z., Ye, G., and Shah, S.P. 2005. Microstructure and early-ageproperties of Portland Cement Paste--Effects of connectivity of solid phases.ACI Materials Journal 102 (March/April): 122-129.
Voigt, T., Ye, G., Sun, Z., Shah, S., and van Breugel, K. 2005. Early agemicrostructure of portland cement mortar investigated by ultrasonic shear wavesand numerical simulation. Cement and Concrete Research 35(5): 858-866.