Minerals Dissolution Effect on the Mechanical Properties of Synthetic Carbonatic Rocks under a Reactive Fluid Injection

  • Katia Galindo Federal University of Pernambuco, Recife, Pernambuco, Brazil
  • Leonardo Guimarães Federal University of Pernambuco, Recife, Pernambuco, Brazil
  • Cecília Lins Rural Federal University of Pernambuco, Cabo de Santo Agostinho, Pernambuco, Brazil
  • Analice Lima Federal University of Pernambuco, Recife, Pernambuco, Brazil
  • Yago Santos Federal University of Pernambuco, Recife, Pernambuco, Brazil
  • Igor Gomes
Keywords: Synthetic carbonate rock, water-weakening, rock-fluid interaction

Abstract

This research aims to evaluate the change in the stiffness and shear strength of synthetic carbonate rocks submitted to a reactive injection fluid. Therefore, laboratory tests were carried out with two types of cemented carbonatic rock artificially produced. The synthetic rocks were subjected to physical characterization tests (mineralogy, computed tomography, porosity, etc.) and mechanical characterization (uniaxial compressive strength and Brazilian tests) before and after the dissolution process to assess any changes in the samples. The dissolution test was performed in a modified oedometer cell, which allowed for measurements of horizontal displacements. The loading and dissolution phases were conducted using water and an acid solution to evaluate the influence of pH on their initial characteristics of the samples. The X-ray diffraction analysis revealed that the increase in maximum porosity by 57.8% and the increase in permeability were due to the dissolution of minerals. During dissolution, the horizontal stress increased linearly, and the maximum volumetric strain was 12.8%, owing to the loss of mass. This was also reflected in the mechanical characteristics since the samples lost about 72% of the strength after the dissolution with the acid solution. The study carried out in this paper helps explain and estimate changes on a micro-scale, that is, to understand how the dissolution of bonds between grains leads to macro-scale changes, such as the loss of mechanical strength causing irreversible damage to the rock.

References

. THOMAS, José Eduardo. Fundamentos de Engenharia de Petróleo. Rio de Janeiro: Ed Interciência, 2001.

. AHR, W. M. (2008) Summary: Geology of Carbonate Reservoirs, in Geology of Carbonate Reservoirs: The Identification, Description, and Characterization of Hydrocarbon Reservoirs in Carbonate Rocks, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470370650.ch8.

. GUIMARÃES, L.J.N., GOMES, I.F., VALADARES, J.P. (2009). Influence of mechanical constitutive model on the coupled hydro-geomechanical analysis of fault reactivation. In: Reservoir Simulation Symposium - Society of Petroleum Engineers SPE, The Woodlands, 2-4 February 2009, SPE-119168-PP. Texas: EUA.

. AUSTAD, T. et al (2008). Seawater in Chalk: An EOR and Compaction Fluid. Society of Petroleum

Engineers. doi:10.2118/118431-PA.

. KORSNES, R.I.; MADLAND, M.V., VORLAND, K.A.N, HILDEBRAND-HABEL, T.,

KRISTIANSEN, T.G.;HIORTH, A. Enhanced Chemical Weakening of Chalk due to Injection of

CO2 Enriched Water. 29º International Symposium of the Society of Core Analysts, Abu Dhabi. pp.

-12, 2008.

. CIANTIA MO, CASTELLANZA R, DI PRISCO C (2015) Experimental study on the water-induced weakening of calcarenites. Rock Mech Rock Eng 48:441–461.

. TANG, Z. C., ZHANG, Q. Z., PENG, J., JIAO, Y. Y. Experimental study on the water-weakening shear

behaviors of sandstone joints collected from the middle region of Yunnan province, P.R. China.,

Engineering Geology, Volume 258, 2019.

. YANG, F. ZHOU, H. ZHANG, C., JINGJING LU, LU, X. GENG, Y. An analysis method for evaluating the safety of pressure water conveyance tunnel in argillaceous sandstone under water-weakening conditions, Tunnelling and Underground Space Technology, Volume 97, 2020.

. SUGUIO, K. 2003. Geologia Sedimentar. Ed. Edgar Blücher Ltda.

. CASTELLANZA, R., and NOVA, R. (2004). “Oedometric tests on artificially weathered carbonatic soft rocks.” J. Geotech. Geoenviron. Eng., 130(7).

. MERODO, F. J., et al., (2007). Coupling transport of chemical species and damage of bonded geomaterials. Comp. & Geotechnics 34(4). 200-215.

. SHIN, H., & SANTAMARINA, J. C. (2009). Mineral dissolution and the evolution of k 0. Journal of

Geotechnical and Geoenvironmental Engineering, 135(8), 1141-1147.

. CIANTIA MO, HUECKEL T. (2013) Weathering of stressed submerged stressed calcarenites: chemo-mechanical coupling mechanisms. Ge´otechnique 63(9):768–785.

. VIEIRA, K. N. ; JESUS, L. L. ; LIMA, A. ; Guimaraes, L.J.N. (2017). Acid Dissolution Analysis of Artificial Carbonate Rock Cemented With Cp V - Ari. In: 9th Brazilian Congress of Research and Development in Oil and Gas, 2017, Maceió, 2017.

. VALLEJOS, J. A., SUZUKI, K., BRZOVIC, A., IVARS, D. M. Application of Synthetic Rock Mass

modeling to veined core-size samples, International Journal of Rock Mechanics and Mining Sciences, Volume 81, 2016, Pages 47-61.

. FEDRIZZI, R. M. et al., (2018). Artificial carbonate rocks: Synthesis and petrophysical characterization. UENF, BRAZIL.

. NIRAULA, L.D. Development of Modified T-z Curves for Large Diameter Piles/drilled Shafts in Limestone for Fb-pier. M.Sc. thesis University of Florida, Florida (2004), p. 163.

. ZHANG, X.; SPIERS, C. J. Compaction of granular calcite by pressure solution at room temperature and effects of pore fluid chemistry. International Journal of Rock Mechanics & Mining Sciences, v. 42, p. 950-960, 2005.

. SILVA, N.V.S. (2012). Capillary and Chemical Compaction Modeling in Oil Reservoirs. Doctoral thesis. Department of Civil Engineering, Federal University of Pernambuco, Pernambuco, Brazil, 122 p.

. MELO, L. M. P.; Leonardo José do N. Guimarães ; LINS, C. M. M. ; LIMA, A. Experimental numerical analysis of synthetic carbonate rock subjected to the injection of a reactive fluid. In: VIII Brazilian Symposium on Unsaturated Soils, 2015, Fortaleza. ÑSAT 2015 VIII Brazilian Symposium on Unsaturated Soils, 2015

LIMA NETO, I.A., R.M. MISSÁGIA, M.A. CEIA, N.L. ARCHILHA, AND L.C. OLIVEIRA, 2014, Carbonate pore system evaluation using the velocity-porosity–pressure (17) (PDF) Carbonate microporosity aspect ratio and -wave velocity prediction from 2D/3D digital image analysis, using inclusion theory. Relationship, digital image analysis, and differential effective medium theory: Elsevier, Journal of Applied Geophysics 110, 23-33. doi:10.1016/j.jappgeo.2014.08.013.

. LINS, C.M.M.S, GUIMARÃES, L., LIMA A., GOMES, I. (2015) Numerical and Experimental Analysis

of Horizontal Stress Changes and Soil Collapse During Chemical Dissolution in a Modified

Oedometer Cell. International Journal of Geotechnical and Geoenvironmental Engineering, Soils and

Rocks. V.39, n. 1, p 4-12, January 2015.

NBR- ANBT- 12025/12. Ensaio de compressão simples de corpos de prova cilindricos- Método de ensaio.

. SCHOLLE, P.A. & ULMER-SCHOLLE, D.S (2003)., A Color Guide to the Petrography of Carbonate Rocks, Grains, Textures, Porosity, Diagenesis, AAPG Memoir 77, P. 212.

. CIANTIA, M.O., CASTELLANZA, R., DI PRISCO, C., 2014. Experimental study on the water-induced

weakening of calcarenites. Rock Mech. Rock. Eng. http://dx.doi.org/10.1007/s00603-

-0603-z

. De Groot SR (1966) Termodynamics of irriversible processes. Amsterdam, North Holland

Published
2021-04-24
Section
Articles