Cement sheath modification using nanomaterials for long-term zonal isolation of oil wells: Review

Jafariesfad, Narjes; Geiker, Mette Rica; Gong, Yi; Skalle, P.; Zhang, Zhiliang

doi:10.1016/j.petrol.2017.06.047

Cited by 73 publications

(19 citation statements)

References 88 publications

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“…The majority of research on the mechanical performance of cement sheaths has focused on conventional cement stone properties 15 : compressive strength, tensile strength, and triaxial compressive strength 16‐19 . However, cement sheaths are subjected to pressures from the casing and formation in the wellbore; these pressures cause radial and tangential stresses inside the sheath, resulting in a complex stress state and failure 20‐22 …”

Section: Introductionmentioning

confidence: 99%

Deformation and damage of cement sheath in gas storage wells under cyclic loading

Li¹,

Tang³

et al. 2021

Energy Science & Engineering

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The mechanical damage and failure of cement sheaths in gas storage wells under cyclic loading have been studied extensively. However, because the test device cannot restore the wellbore condition, most studies have been theoretical or regular experimental. If the load‐bearing mode and stress environment in a test device differ from those in a wellbore, then the damage and failure modes will deviate from what occurs in the actual wellbore. Therefore, it is necessary to explore a method that restores the wellbore condition and design a wellbore simulation device that reveals the deformation and damage of the cement sheath. In this study, the development laws of microannulus and microcracks in the cement sheath were studied by triaxial cyclic loading, low‐field nuclear magnetic resonance imaging, and scanning electron microscopy. A device to evaluate cement sheath integrity was then developed. A stress equivalence method was proposed, based on the principle that the stresses at the first and second interfaces of the device are equal to those of the wellbore cement sheath. This method was used to design material, size, and experimental conditions to simulate the load‐deformation law of a cement sheath in a gas storage well. The damage failure mechanism was investigated using the simulation results and computed tomography. Micropores and microcracks in the cement sheath increased continuously under cyclic loading. Damage accumulated, causing strength failure as the period of the cyclic loading increased. Plastic deformation of the cement sheath occurred under cyclic loading, but interfacial peeling did not. The reason is that the cement sheath is under compressive stress during loading and unloading, and the interface between the cement sheath and the outer wall is not damaged. This study provides a new method for studying the mechanical failure of a cement sheath under complex wellbore conditions.

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Section: Introductionmentioning

confidence: 99%

Deformation and damage of cement sheath in gas storage wells under cyclic loading

Li¹,

Tang³

et al. 2021

Energy Science & Engineering

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“…Such condition requires sufficient flexible cement system with high tensile strength to Young's modulus and compressive strength to Young's modulus ratios. The OPC-based system is brittle in nature and may show a weak performance at downhole condition by forming radial cracks when it is subjected to an excessive load [3][4][5]. Therefore, researchers and technology providers continuously attempt to improve the quality of set cement and the cementing operation by either new cementing techniques or introducing alternative cementitious materials for the situations that OPC has limitations [6,7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Hydraulic Sealability and Shear Bond Strength of Cementitious Barrier Materials

Kamali

Khalifeh

Eid

et al. 2021

Journal of Energy Resources Technology

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In this experimental study, two different cementitious materials including (i) a class of expansive cement currently used for plug and abandonment (P&A) operations, and (ii) a non-cement-based naturally occurring rock, known as geopolymer are selected to examine the hydraulic bond strength and shear bond strength. Clean machined steel and rusty corroded steel were selected to represent the casing. The test samples were cured at 90 °C considered as bottom-hole static temperature (BHST) and under elevated pressure of 17.2 MPa for one week. The hydraulic sealability of the barrier materials tested up to 3.4 MPa of differential pressure. The results indicated that additives used in slurry preparation impact the hydraulic sealability of the material. Additionally, the rusty corroded streel provided a better hydraulic sealability comparing to the clean machined steel for the same cementitious material. The shear bond strength test was performed by running the push-out test. According to the present test observations, no correlation was found between the shear bond and hydraulic bond strength of different barrier materials. The geopolymer showed the lowest shear bond strength, while it provided the highest hydraulic sealability.

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“…In oil and gas well cementing, the cement slurry is filled outside the casing pipes (Li et al 2017). Thus, the sheath modification is required to maintain the well integrity behind the casing (Zeng et al 2019) and provide longterm zonal isolation to ensure the safety and prevention of environmental problems (Jafariesfad et al 2017). However, the variation of subsurface conditions such as temperature in the oilwell poses a challenge of degradation to the use of ordinary Portland cement that compromises the strength development (Omosebi et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Coupled effects of hydrophilic nano silica oxide and anatase nano titanium oxide on strengths of oilwell cement

Mabeyo

2021

Tanz. J. Sci.

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The life of oil wells depends on the stability of cement sheath and bond strength with the formation and casing. Extreme subsurface conditions cause substantial stresses on the cement sheath resulting in a serious impact on well integrity. The recommended API cement for oilwell fails to provide the required durability of the cemented well due to such conditions. Supplementary cementitious materials such as nanoparticles are added to improve the cement for long-lasting zonal isolation. In this study, the compressive and shear bond strengths of oilwell cement containing nano-SiO2 and nano-TiO2 were studied at 80 °C for 3, 7, 14, and 28 days of hydration. The XRD, TG, and DSC were used for the analysis of cement hydration products. The results revealed that both nano-SiO2 and nano-TiO2 increased strength evolution. A ternary system made with 2% nano-SiO2 and 2% nano-TiO2 improved compressive strength by 22.6 and 48.4%, while the shear bond strength increased by 110.6 and 55% at age of 3 days and 28 days, respectively, compared to their corresponding binary systems. Therefore, these results remark the potential of replacing an appropriate proportion of oilwell cement with coupled nano-SiO2 and nano-TiO2 to ensure cement sheath structure durability in the annular and long-lasting zonal isolation. Keywords: Nano-silica, nano-titanium, compressive strength, shear bond strength, oilwell cement

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Cement sheath modification using nanomaterials for long-term zonal isolation of oil wells: Review

Cited by 73 publications

References 88 publications

Deformation and damage of cement sheath in gas storage wells under cyclic loading

Deformation and damage of cement sheath in gas storage wells under cyclic loading

Experimental Study of Hydraulic Sealability and Shear Bond Strength of Cementitious Barrier Materials

Coupled effects of hydrophilic nano silica oxide and anatase nano titanium oxide on strengths of oilwell cement

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