The Effect of Fluid Content on the Mechanical Behaviour of Fractures in Chalk

Gutierrez, Marte; Øino, L. E.; Höeg, Kaare

doi:10.1007/s006030050037

Cited by 45 publications

(1 citation statement)

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“…However, more recent studies pointed out that chemistry of a saturating fluid plays an important role in the water weakening of chalk. By comparison of mechanical properties of the outcrop Lagerdorf chalk samples saturated with water and synthetic oil, Høeg et al (2000) suggested that water-chalk interactions are governed by both capillary forces and chemical or physico-chemical processes.…”

Section: Mechanisms Of W Mechanisms Of W Mechanisms Of W Mechanisms Of Water Weakening Of Chalkmentioning

confidence: 99%

Mechanisms of smart waterflooding in carbonate oil reservoirs - A review

Hao

Mohammadkhani

Shahverdi

et al. 2019

Journal of Petroleum Science and Engineering

109

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Section: Mechanisms Of W Mechanisms Of W Mechanisms Of W Mechanisms Of Water Weakening Of Chalkmentioning

confidence: 99%

Mechanisms of smart waterflooding in carbonate oil reservoirs - A review

Hao

Mohammadkhani

Shahverdi

et al. 2019

Journal of Petroleum Science and Engineering

109

View full text Add to dashboard Cite

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The effect of fluid composition, salinity, and acidity on subcritical crack growth in calcite crystals

et al. 2016

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Chemically activated processes of subcritical cracking in calcite control the time‐dependent strength of this mineral, which is a major constituent of the Earth's brittle upper crust. Here experimental data on subcritical crack growth are acquired with a double torsion apparatus to characterize the influence of fluid pH (range 5–7.5) and ionic strength and species (Na2SO4, NaCl, MgSO4, and MgCl2) on the propagation of microcracks in calcite single crystals. The effect of different ions on crack healing has also been investigated by decreasing the load on the crack for durations up to 30 min and allowing it to relax and close. All solutions were saturated with CaCO3. The crack velocities reached during the experiments are in the range 10−9–10−2 m/s and cover the range of subcritical to close to dynamic rupture propagation velocities. Results show that for calcite saturated solutions, the energy necessary to fracture calcite is independent of pH. As a consequence, the effects of fluid salinity, measured through its ionic strength, or the variation of water activity have stronger effects on subcritical crack propagation in calcite than pH. Consequently, when considering the geological sequestration of CO2 into carbonate reservoirs, the decrease of pH within the range of 5–7.5 due to CO2 dissolution into water should not significantly alter the rate of fracturing of calcite. Increase in salinity caused by drying may lead to further reduction in cracking and consequently a decrease in brittle creep. The healing of cracks is found to vary with the specific ions present.

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Experimental Investigation on the Time Dependent Behaviour of a Multiphase Chalk

Priol

Gennaro

Delage

et al.

Springer Proceedings in Physics

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Summary. A series of high pressure oedometer compression tests were carried out on samples of Lixhe chalk (Belgium) containing various pore fluids: water, air (dry sample), oil (Soltrol) and oil/water under a controlled suction of 200 kPa. Strain curves with respect to time of tests carried out under a constant load were examined in a purpose of investigating the time dependent behaviour of chalk. A simple empirical exponential law able to account for the combined effects of stress and suction is proposed. Experiments show that it provides satisfactory results to predict a feature of multiphase chalk behaviour that is important in the study of the behaviour of oilfields.

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The Effect of Fluid Content on the Mechanical Behaviour of Fractures in Chalk

Cited by 45 publications

References 0 publications

Mechanisms of smart waterflooding in carbonate oil reservoirs - A review

Mechanisms of smart waterflooding in carbonate oil reservoirs - A review

The effect of fluid composition, salinity, and acidity on subcritical crack growth in calcite crystals

Experimental Investigation on the Time Dependent Behaviour of a Multiphase Chalk

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