Effect of Cleaning the Annular Space on the Adhesion of the Cement Sheath to the Rock

Kremieniewski, Marcin; Błaż, S.; Stryczek, S.; Wiśniowski, R.; Gonet, Andrzej

doi:10.3390/en14165187

Cited by 10 publications

(7 citation statements)

References 41 publications

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“…Additionally, the lack of adhesion also reduces the stabilization of the pipe in the borehole [21]. In [22], the authors focus on determining the impact of cleaning the annular space on the adhesion of the cement sheath to the rock formation. The issues related to the preparation of the borehole for cementation by appropriate cleaning of the rock formation from mud cake residues contribute to the improvement of oil recovery, which contributes to the improvement of drilling works [23].…”

Section: A Short Review Of the Contributions In This Issuementioning

confidence: 99%

Improving the Efficiency of Oil Recovery in Research and Development

Kremieniewski

2022

Energies

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Section: A Short Review Of the Contributions In This Issuementioning

confidence: 99%

Improving the Efficiency of Oil Recovery in Research and Development

Kremieniewski

2022

Energies

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“…Several factors influence the development of leakage pathways during cement placement. − Mud channels can form a potential pathway once they dehydrate, resulting in cracks. Another factor is poor casing cleaning, which might lower the hydraulic bond between the cement and casing, resulting in microannulus development.…”

Section: Literature Reviewmentioning

confidence: 99%

Numerical Modeling of Gas Migration through Cement Sheath and Microannulus

et al. 2021

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Cement sheath is considered an important barrier throughout the life cycle of the well. The integrity of the cement sheath plays a vital role in maintaining the integrity of wells. Cement’s ability to seal the annular space or a wellbore, also known as cement sealability, is an important characteristic of the cement to maintain the well integrity. It is believed that placing cement in the annular space or wellbore can totally prevent any leakage; however, that is debatable. The reason why cement cannot completely prevent fluid leakage is that cement is considered as a porous medium, and also flaws in cement, such as microannuli, channels, and fractures, can develop within the cement sheath. Furthermore, the complexity of casing/cement and cement/formation interaction makes it very difficult to fully model the fluid migration. Hence, fluid can migrate between formations or to the surface. This article presents a numerical model for gas flow in cement sheath, including the microannulus flow. A parametric study of different variables and their effect on the leakage time is carried out, such as the microannulus gap size, cement matrix permeability, cement column length, and cement porosity. In addition, it presents leakage scenarios for different casing/liner overlap length with the existence of microannulus. The leakage scenarios revealed that the cement matrix permeability, microannulus gap size, and cement length can highly impact the leakage time; however, cement porosity has a minimal effect on the leakage time. In addition, modeling results revealed that the casing/liner overlap length should not be less than 300 ft, and the casing pressure duration should be beyond 30 min to detect any leak.

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“…At the top of the bushing, a special piston-shaped "squeezer" with a diameter equal to the internal diameter of the bushing was placed, which exerted pressure on the hardened cement slurry, breaking its adhesion with the steel bushing. The pressure force at which the adhesion of the hardened cement slurry with the bushing was broken determined the amount of adhesion of the hardened cement slurry to the bushing, which in turn determined its degree of washing from the filtercake [9,10], e.g. when the hardened cement slurry slipped out of the bushing spontaneously without any force applied to it, it could be said that filtercake was not removed.…”

Section: Laboratory Researchmentioning

confidence: 99%

Improvement of mud displacement from the annular space of the borehole in terms of the criterion of selecting washing fluids and pre-flushes

Formela

2021

jge

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One of the most important steps in drilling the well is cementing the annular space between casing and rock formations. This process is significant because of the stabilization of the well and effectively separation of the consecutive rock horizons. It is required that cementing ensures durable and effective insulation of the rock mass. The complete displacement of the drilling fluid from the annular space is particularly important due to a number of negative phenomena related to its insufficient extrusion. The cement slurry pressed through the annular space displaces the mud but is not able to sufficiently thoroughly remove the residue left behind. The subject of the laboratory research was to check how selected washer affect the efficiency of displacing drilling fluid from the annular space of the borehole. In addition, the tests included the determination of the optimal washing time and the optimal pumping rate of the washing fluid. Moreover, the tests included the determination of the optimal washing time and the optimal pumping rate of the washing fluid.

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Effect of Cleaning the Annular Space on the Adhesion of the Cement Sheath to the Rock

Cited by 10 publications

References 41 publications

Improving the Efficiency of Oil Recovery in Research and Development

Improving the Efficiency of Oil Recovery in Research and Development

Numerical Modeling of Gas Migration through Cement Sheath and Microannulus

Improvement of mud displacement from the annular space of the borehole in terms of the criterion of selecting washing fluids and pre-flushes

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