Assessing Mechanical Integrity of Expanding Cement

Patel, Harshkumar; Salehi, Saeed; Teodoriu, Cătălin

doi:10.2118/195225-ms

Cited by 12 publications

(3 citation statements)

References 20 publications

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“…In order to investigate the influence of pre-stress status caused by the expansion (e. g. mineral brucite formation) on the cement matrix mechanical integrity, Patel et al used the Finite Element Modeling (FEM) method and acquired some perceptive findings (Patel et al, 2019). Their work included two parts: 1) the effect of different pre-stress conditions on the mechanical integrity of set cement; 2) sensitivity analysis between them.…”

Section: Fem Modeling-the Impact Of Pre-stress Resulting From the Expansion On The Mechanical Integrity Of The Cement Sheathmentioning

confidence: 99%

Recent Advances in Magnesia Blended Cement Studies for Geotechnical Well Construction—A Review

et al. 2021

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The current paper presents a literature review on the studies of incorporation of magnesia (magnesium oxide) into Portland cement material from the geotechnical well construction perspective. Starting with a comparison of application conditions between civil construction and geotechnical well cementing, this work reviewed the Portland cement categorizations, magnesia manufacturing routes at first. Then, the physical-chemical-mechanical properties were investigated which includes the reactivity of magnesia, expansion influence from its hydration, and carbonation/dehydroxylation of magnesia blended Portland cement. The development of cement material hydration modeling methods is also summarized. Moreover, the experimental characterization methods have also been elucidated including composition determination, particle size analysis, volumetric variation measurement, compressive strength testing, shear-bond strength testing, transition state analysis, etc. Meanwhile, the results and conclusions were extracted from the literature. Through this route, a comprehensive understanding of the scientific research progress on magnesia blended Portland cement development for geotechnical well construction is derived. Additionally, it is concluded that incorporating magnesia into Portland cement can provide benefits for this material utilization in geotechnical well constructions provided the reasonable tuning among the characteristics of magnesia, the downhole surrounding conditions, and the formulation of the cement slurry. Satisfying these pre-conditions, the effective expansion not only mitigates the micro-annulus issues but also increases the shear bonding strength at the cementing interfaces. Moreover, the caustic magnesia introduction into Portland cement has the potential advantage on carbon dioxide geological sequestration well integrity compared with the Portland cement sheath without it because of the denser in-situ porous matrix evolvement and more stable carbon fixation features of magnesium carbonate. However, since the impact of magnesia on Portland cement strongly depended on its properties (calcination conditions, particle size, reactivity) and the aging conditions (downhole temperature, pressure, contacting medium), it should be noted that some extended research is worth conducting in the future such as the synchronized hydration between magnesia and Portland cement, the dosage limit of caustic magnesia in Portland cement in terms of CO2 sequestration and the corresponding mechanical properties analysis, and the hybrid method (caustic magnesia, Portland cement, and other supplementary cementitious materials) targeting the co-existence of the geothermal environment and the corrosive medium scenario.

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Section: Fem Modeling-the Impact Of Pre-stress Resulting From the Expansion On The Mechanical Integrity Of The Cement Sheathmentioning

confidence: 99%

Recent Advances in Magnesia Blended Cement Studies for Geotechnical Well Construction—A Review

et al. 2021

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“…Expanding cement has also emerged as a promising solution to improve cement bonding by compensating volume shrinkage and micro-annulus formation after the cement has set. Expanding cement has also been shown to improve mechanical integrity of the cement sheath by minimizing the risk of structural failure [26]. Not only can the additives enhance the integrity of the cement sheath but also the quality of water used to prepare the cement slurry [27].…”

Section: Introductionmentioning

confidence: 99%

Analytical and Experimental Investigation of the Critical Length in Casing–Liner Overlap

et al. 2019

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Offshore drilling operations exhibit various difficulties attributed to shallow flows worldwide. One of the most common practices for drilling offshore wells is to use liners and liner hangers rather than using full casing strings. This reduces the cost of drilling operation. Liners and liner hangers are required to pass certain standards prior to their deployment in the field. This ensures their ability to withstand harsh downhole conditions and maintain the integrity of the well. A liner hanger contains an integrated seal assembly that acts as a barrier to prevent fluid migration. The cement that is placed within the casing–liner overlap is also considered a barrier, and it is critical that it maintains the integrity of the well by mitigating fluid migration to other formations and to the surface. The failure of this dual barrier (cement and seal assembly) system to seal the annular space can result in serious problems that might jeopardize a well’s integrity. Typically, in field applications, the length of a casing–liner overlap is chosen arbitrarily. In some cases, shorter overlaps (50 to 200 ft) are chosen because of the lower cost and easy identification of leaks during pressure tests. However, some loss of well control incidents (particularly the incident that motivated this study) have been linked to fluid leakages along the casing–liner overlap. This paper investigates the critical length of the casing–liner overlap by modeling gas leakage through the cement placed within the overlap using analytical and experimental approaches. Leakage scenarios were developed to mimic gas migration within the cement in the casing–liner overlap. The results showed that the longer the casing–liner overlap, the higher the leakage time. The results also showed that the current casing pressure test duration of 30 min may not be adequate to verify the integrity of the cement within the overlap. Based on the results and analyses, it is recommended to increase the pressure test duration to 90 min. In addition, the results suggest that the length of the casing–liner overlap should not be less than 300 ft to maintain the integrity of the well in the case of gas influx. Further details are highlighted in the results section. In practice, the current rationale behind the selection of a casing–liner overlap length is not sustainable. Thus, the major advantage of this study is that with field data, it provides both scientific and research-based evidence that can be used to inform the decision behind the selection of the casing–liner overlap length, especially in gas migration-prone zones.

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Section: Fem Modeling-the Impact Of Pre-stress Resulting From the Expansion On The Mechanical Integrity Of The Cement Sheathmentioning

confidence: 99%

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Assessing Mechanical Integrity of Expanding Cement

Cited by 12 publications

References 20 publications

Recent Advances in Magnesia Blended Cement Studies for Geotechnical Well Construction—A Review

Recent Advances in Magnesia Blended Cement Studies for Geotechnical Well Construction—A Review

Analytical and Experimental Investigation of the Critical Length in Casing–Liner Overlap

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