Investigations on the surface well cement integrity induced by thermal cycles considering an improved overall transfer coefficient

Ichim, Adonis; Teodoriu, Habil Catalin

doi:10.1016/j.petrol.2017.02.013

Cited by 16 publications

(4 citation statements)

References 10 publications

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“…Ref. (Ichim and Teodoriu, 2017) [29] performed an analysis of the cement sheath's sealing failure mechanism in thermal recovery wells, and it was deduced that the thermal recovery well should first consider the influence of temperature on the mechanical properties of cement sheath, and secondly, the sealing failure mechanism of the cement sheath under temperature-cycling conditions should be considered.…”

Section: Introductionmentioning

confidence: 99%

The Failure Mechanism and Countermeasures of Cement Sheath in Vertical Section of Well during Hydraulic Fracturing

Lu,

Li,

Lian

et al. 2023

Processes

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The sustained casing pressure (SCP) phenomenon of shale gas and oil wells occurs frequently after fracturing; therefore, in order to assess the cement sheath’s integrity in the vertical well portion, the cement stones were subjected to a compression test under different temperatures and confining pressures to obtain the mechanical parameters of the cement sheath at different well depths. The integrity of the cement ring between the production casing and the intermediate casing was then investigated using the Moore–Coulomb criterion. We also took into account other elements including pump pressure, production casing wall thickness, and cement ring mechanical properties. The results show that (1) the compressive strength, Poisson’s ratio, and Young’s modulus of cement stone vary obviously under different confining pressures and temperature conditions, and the cement stone shows elastic–brittle failure characteristics at 20 °C. The compressive strength, Poisson’s ratio, and Young’s modulus increase with the confining pressure, but the Young’s modulus and compressive strength gradually decrease with the increase in temperature, while the stress–strain curves show obvious plastic failure characteristics at 80 °C and 130 °C. (2) The tangential tensile stress decreases and depth increases from the wellhead to the intermediate casing shoe, while the radial compressive stress of the cement sheath increases. The stress state of the cement sheath changes abruptly at the position of the casing shoe due to the change in casing layers, and under the intermediate casing shoe, the tangential tensile stress changes from tension to compression. When a conventional cementing slurry system is used, the integrity of the cement sheath above the intermediate casing shoe will fail during fracturing. (3) Reducing the pump pressure and increasing casing wall thickness can reduce the tangential and radial stresses of the cement sheath, but the integrity of cement sheath cannot be fully guaranteed. For the cement sheath’s sealing integrity, it is advantageous to decrease the Young’s modulus and raise its strength.

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Section: Introductionmentioning

confidence: 99%

The Failure Mechanism and Countermeasures of Cement Sheath in Vertical Section of Well during Hydraulic Fracturing

Lu,

Li,

Lian

et al. 2023

Processes

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“…The conditions of elevated temperature are expected in deep wells, geothermal wells, and wells subjected to steam injection for enhanced oil recovery (EOR) applications, since the injected steam is able to decrease the oil viscosity, and hence, increase its mobility and finally enhance the oil production [16]. Currently, thermal oil recovery is a widely used technique around the world to produce heavy oil in many projects, examples are: (a) Kern Field in California, USA; (b) the Athabasca Oil Sands in Alberta, Canada; (c) Mene Grande in Venezuela; (d) Northeast Region in Brazil; and (e) the Surplacul de Barcau Field in Romania, [17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Influence of Nanoclay Content on Cement Matrix for Oil Wells Subjected to Cyclic Steam Injection

et al. 2019

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High-temperature conditions drastically compromise the physical properties of cement, especially, its strengths. In this work, the influence of adding nanoclay (NC) particles to Saudi class G oil well cement (OWC) strength retrogression resistance under high-temperature condition (300 °C) is evaluated. Six cement slurries with different concentrations of silica flour (SF) and NC were prepared and tested under conditions of 38 °C and 300 °C for different time periods (7 and 28 days) of curing. The changes in the cement matrix compressive and tensile strengths, permeability, loss in the absorbed water, and the cement slurry rheology were evaluated as a function of NC content and temperature, the changes in the structure of the cement surfaces were investigated through the optical microscope. The results revealed that the use of NC (up to 3% by weight of cement (BWOC)) can prevent the OWC deterioration under extremely high-temperature conditions. Incorporating more than 3% of NC severely damaged the cement matrix microstructure due to the agglomeration of the nanoparticles. Incorporation of NC particles increased all the cement slurry rheological properties.

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“…Long-term production of oil and gas rely on cementing materials capable of withstanding crack growth and propagation, therefore ensuring the integrity of the cement sheath (Anjos et al, 2013;Costa et al, 2017;Han et al, 2011;Ichim and Teodoriu, 2017;Silva et al, 2018;Mangadlao et al, 2015;Soares et al, 2015;Souza et al, 2018). To that end, the addition of short fibers potentially increases the fracture energy of Portland-based cement materials (Bentur and Mindess, 2007).…”

Section: Introductionmentioning

confidence: 99%

Milled basalt fiber reinforced Portland slurries for oil well applications

Paiva

Ferreira

Martinelli

et al. 2019

Journal of Petroleum Science and Engineering

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Investigations on the surface well cement integrity induced by thermal cycles considering an improved overall transfer coefficient

Cited by 16 publications

References 10 publications

The Failure Mechanism and Countermeasures of Cement Sheath in Vertical Section of Well during Hydraulic Fracturing

The Failure Mechanism and Countermeasures of Cement Sheath in Vertical Section of Well during Hydraulic Fracturing

Influence of Nanoclay Content on Cement Matrix for Oil Wells Subjected to Cyclic Steam Injection

Milled basalt fiber reinforced Portland slurries for oil well applications

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