Water weakening of chalk— Mechanical effects of water–glycol mixtures

Risnes, Rasmus; Madland, Merete Vadla; Hole, Malcolm; Kwabiah, N. K.

doi:10.1016/j.petrol.2005.04.004

Cited by 140 publications

(130 citation statements)

References 7 publications

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“…As water injection into chalk reservoirs is an important method for enhanced oil recovery (EOR), chalk-water interactions have received considerable attention recently due to reservoir compaction [144]. Reservoirs of this sort may undergo large and unexpected deformations which cannot be simulated accurately by poroelastic models which justifies using a coupled flow and poroplasticity model [3].…”

Section: Literature Review 121 Geomechanicsmentioning

confidence: 99%

Domain Decomposition Methods in Geomechanics

Florez

Wheeler

Rodríguez

2013

SPE Reservoir Simulation Symposium

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Dedicated to the memory of my beloved mother Emma Guzman and mysister Aura E. Florez-Guzman. AcknowledgmentsI would like to express my sincere appreciation for my advisor, Professor Mary F. Wheeler. She practically brought me from Venezuela for giving me the opportunity to attend graduate school at US. This ultimately opened new avenues to insert myself successfully in a country with a different language and culture. I will always appreciate this opportunity. She introduced me to topics such as mixed finite elements, discontinuous Galerkin schemes, domain decomposition and mortar methods. I am also thankful for her financial support, enthusiasm, and persistence on pursuing cutting-edge research.

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Section: Literature Review 121 Geomechanicsmentioning

confidence: 99%

Domain Decomposition Methods in Geomechanics

Florez

Wheeler

Rodríguez

2013

SPE Reservoir Simulation Symposium

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“…Warm air contains quantities of water vapor, and lowering the temperature induces water condensation. Wetness and water saturation can decrease the value of the rock strength of porous limestones near the fracture tip by 20 to 70% (e.g., Rutter, 1972;Parate, 1973;Vutukuri, 1974;Atkinson, 1979;Atkinson and Meredith, 1987;Homand and Shao, 2000;Rhett and Lord, 2001;Gueguen and Boutéca, 2004;Risnes et al, 2005;Ghabezloo and Pouya, 2006) especially at low temperatures (0-10 • C). Strength of porous limestones may decrease by almost 50% when their degree of saturation reaches only 10%, and their tensile strength may be as low as 500 kPa at the sample scale (Ghabezloo and Pouya, 2006).…”

Section: Action Of Fluids and Frostmentioning

confidence: 99%

Pre-failure behaviour of an unstable limestone cliff from displacement and seismic data

Got

Mourot

Grangeon

2010

Nat. Hazards Earth Syst. Sci.

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Abstract. We monitored the displacement and seismic activity of an unstable vertical rock slice in a natural limestone cliff of the southeast Vercors massif, southeast France, during the months preceding its collapse. Displacement measurements showed an average acceleration of the movement of its top, with clear increases in the displacement velocity and in the discrete seismic event production rate during periods where temperature falls, with more activity when rainfall or frost occurs. Crises of discrete seismic events produce high amplitudes in periodograms, but do not change the high frequency base noise level rate. We infer that these crises express the critical crack growth induced by water weakening (from water vapor condensation or rain) of the rock strength rather than to a rapid change in applied stresses. Seismic noise analysis showed a steady increase in the high frequency base noise level and the emergence of spectral modes in the signal recorded by the sensor installed on the unstable rock slice during the weeks preceding the collapse. High frequency seismic noise base level seems to represent subcritical crack growth. It is a smooth and robust parameter whose variations are related to generalized changes in the rupture process. Drop of the seismic noise amplitude was concomitant with the emergence of spectral modes -that are compatible with high-order eigenmodes of the unstable rock sliceduring the later stages of its instability. Seismic noise analysis, especially high frequency base noise level analysis may complement that of inverse displacement velocity in earlywarning approaches when strong displacement fluctuations occur.

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“…Chemical effects due to reactions between the chalk framework and the injected water are one of the major mechanisms in the so-called water weakening processes (Newman, 1983;Rhett and Teufel, 1991;Teufel and Rhett, 1992;Piau and Maury, 1994;Risnes and Flaageng, 1999;Risnes et al, 2005;Madland et al, 2011). Chemical dissolution precipitation have been investigated through various approaches such as numerical simulations (Pietruszczak et al, 2006;Lydzba et al, 2007;Hueckel and Hu, 2007), experimental studies (Hellmann et al, 2002b), as well as microscopic studies (Hellmann et al, 2002a).…”

Section: Introductionmentioning

confidence: 99%

Mechanical and physical behavior of high-porosity chalks exposed to chemical perturbation

Megawati

Madland

Hiorth

2015

Journal of Petroleum Science and Engineering

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Extensive study on the effect of dissolution-precipitation on mechanical behavior of various high-porosity outcrop chalks (Liége, Aalborg, Kansas, Stevns Klint, and Mons) flooded with simplified aqueous chemistry at 130 °C under isotropic stress beyond the yield is performed.Chemical effects induced by injection of 0.219 M MgCl2 solutions into impure chalks (Liége, Aalborg, Kansas) lead to an immediate enhancement on the macroscopic creep with more than a factor of 2 larger than that of exposed to 0.657 M NaCl solutions. In pure chalks The chemical effects are also demonstrated by marked reduction in the permeability. The porosity-permeability relationship measured at the end of creep test is shifted down from the initial correlation, indicating a dramatic increase in the chalk specific surface area.

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Water weakening of chalk— Mechanical effects of water–glycol mixtures

Cited by 140 publications

References 7 publications

Domain Decomposition Methods in Geomechanics

Domain Decomposition Methods in Geomechanics

Pre-failure behaviour of an unstable limestone cliff from displacement and seismic data

Mechanical and physical behavior of high-porosity chalks exposed to chemical perturbation

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