The Effect of CO2-Saturated Brine on the Conductivity of Wellbore-Cement Fractures
- Tevfik Yalcinkaya (Louisiana State University) | Mileva Radonjic (Louisiana State University) | Richard G. Hughes (Louisiana State University) | Clinton Willson (Louisiana State University) | Kyungmin Ham (Louisiana State University)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- September 2011
- Document Type
- Journal Paper
- 332 - 340
- 2011. Society of Petroleum Engineers
- 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 1.6.9 Coring, Fishing, 6.5.3 Waste Management, 3 Production and Well Operations, 1.14 Casing and Cementing
- Fracture, CO2-Saturated brine, Conductivity, Cement
- 1 in the last 30 days
- 615 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 12.00|
|SPE Non-Member Price:||USD 35.00|
The efficiency of carbon-capture and -storage (CCS) projects is directly related to the long-term sealing ability of cemented sections in wellbores penetrating CO2-storage reservoirs. The microfractures inside the wellbore cement and/or microannuli are possible pathways for CO2 leakage to the surface and/or fresh-water-aquifer leakage and could jeopardize safe and long-term containment of CO2 in the subsurface. This paper presents an experimental study that investigates the changes inside the cement internal structure when exposed to acidic brine through an artificial fracture. A 30-day-long flow-through experiment was conducted using a 1 × 12-in. cement core and CO2-saturated brine as a permeant at a flow rate of 2 mL/min in a coreflooding apparatus with 10 and 600 psi of injection and net overburden pressure, respectively [low-pressure (LP) experiment]. The same experiment was repeated with the same flow rate but with 1,800 and 600 psi of injection and net overburden pressures, respectively, for 10 days in order to account for the effects of pressure on the degradation process of cement [high-pressure (HP) experiment]. High-resolution X-ray computed tomography (CT) was used to image several subvolumes extracted from the flow-through cores. The images were processed and thresholded, followed by calculation of porosity. Total porosity was observed to decrease from 26 to 22% after 30 days of exposure in the LP experiment. The HP experiment did not cause any significant change in total porosity, possibly because of the short duration of the experiment.
|File Size||1 MB||Number of Pages||9|
Abell, A.B., Willis, K.L., and Lange, D.A. 1999. MercuryIntrusion Porosimetry and Image Analysis of Cement-Based Materials. J.Colloid Interface Sci. 211 (1): 39-44. http://dx.doi.org/10.1006/jcis.1998.5986.
Bachu, S. and Bennion, D.B. 2009. Experimental assessment ofbrine and/or CO2 leakage through well cements at reservoir conditions. Int.J. Greenhouse Gas Control 3 (4): 494-501. http://dx.doi.org/10.1016/j.ijggc.2008.11.002.
Brandl, A., Cutler, J., Seholm, A., Sansil, M., and Braun, G. 2011. Cementing Solutions for Corrosive Well Environments. SPEDrill & Compl 26 (2): 208-219. 132228-PA. http://dx.doi.org/10.2118/132228-PA.
Duguid, A., Radonjic, M., and Scherer, G. 2005. Degradation of wellcements exposed to carbonated brine. Paper presented at the Fourth AnnualConference on Carbon Capture and Sequestration DOE/NETL, Alexandria,Virginia,USA, 2-5 May.
Hewlett, P. and Lea, F. 2004. Lea's Cement Chemistry ofCement and Concrete, fourth edition. Oxford, UK: Butterworth-Heinemann.
Nelson, E.B. and Guillot, D. 2006. Well Cementing. Sugar Land, Texas:Schlumberger.
Radonjic, M., Yalcinkaya, T., and C.S., W. 2010. Conductivity ofFractures in Oilwell Cement upon Contact with Sequestered CO2. Paper presentedat the 3rd International Conference on Porous Media and its Applications inScience and Engineering, Montecatini Terme, Italy, 20-25 June.
Ravi, K., Bosma, M., and Gastebled, O. 2002. Improve the Economics ofOil and Gas Wells by Reducing the Risk of Cement Failure. Paper SPE 74497presented at the IADC/SPE Drilling Conference, Dallas, 26-28 February. http://dx.doi.org/10.2118/74497-MS.
Van Gerven, T., Cornelis, G., Vandoren, E., and Vandecasteele, C.2007. Effects of carbonation and leaching on porosity in cement-bound waste.Waste Manage. (Oxford) 27 (7): 977-985. http://dx.doi.org/10.1016/j.wasman.2006.05.008.