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The Influence of Casing-Sand Adhesion on Cementing Bond Strength.

Zhao X, Guan Z, Xu M, Shi Y, Liao H, Sun J - PLoS ONE (2015)

Bottom Line: However, due to the lack of detailed study of the technique, many questions remain.The priority orders of key factors are: sand grain size, sand coverage, adhesive curing temperature and adhesive curing time.The optimal parameters recommended for application are: 1.6mm~1.9mm sand grain size, 60%~70% sand coverage, 30°C curing temperature and 60 hours curing time.

View Article: PubMed Central - PubMed

Affiliation: College of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong, China.

ABSTRACT
In the petroleum industry, one of the most serious problems encountered during cementing is the failure at the bonding interface. Many measures including casing-sand adhesion have been developed to improve cementing bond strength. However, due to the lack of detailed study of the technique, many questions remain. The primary goal of this study is to investigate the influence of casing-sand adhesion on cementing bond strength, and to optimize parameters. An orthogonal experiment and a supplementary experiment were conducted. The results indicated that casing-sand adhesion can improve the cementing bond strength. The priority orders of key factors are: sand grain size, sand coverage, adhesive curing temperature and adhesive curing time. The optimal parameters recommended for application are: 1.6mm~1.9mm sand grain size, 60%~70% sand coverage, 30°C curing temperature and 60 hours curing time.

No MeSH data available.


Related in: MedlinePlus

The interfacial shear strength under various conditions of casing surface.The results of casing without sand (blue) and casing adhered sand (red).
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pone.0130892.g007: The interfacial shear strength under various conditions of casing surface.The results of casing without sand (blue) and casing adhered sand (red).

Mentions: Fig 7 shows the testing results of casings being dipped into drilling fluid for different durations. From Fig 7, the shear strength is influenced significantly by the surface condition of casing, and the shear strength reaches the maximum value without the casing dipped into drilling fluid. This is because mud cake was formed at casing surface if it was dipped into drilling fluid, and the longer time dipped, the thicker mud cake is. Meanwhile, the shear strength of sand adhered casings is always higher than the casings without sand, with an average of 1.53 times. Therefore, we conclude that casing-sand adhesion can improve the cementing bond strength effectively.


The Influence of Casing-Sand Adhesion on Cementing Bond Strength.

Zhao X, Guan Z, Xu M, Shi Y, Liao H, Sun J - PLoS ONE (2015)

The interfacial shear strength under various conditions of casing surface.The results of casing without sand (blue) and casing adhered sand (red).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4482754&req=5

pone.0130892.g007: The interfacial shear strength under various conditions of casing surface.The results of casing without sand (blue) and casing adhered sand (red).
Mentions: Fig 7 shows the testing results of casings being dipped into drilling fluid for different durations. From Fig 7, the shear strength is influenced significantly by the surface condition of casing, and the shear strength reaches the maximum value without the casing dipped into drilling fluid. This is because mud cake was formed at casing surface if it was dipped into drilling fluid, and the longer time dipped, the thicker mud cake is. Meanwhile, the shear strength of sand adhered casings is always higher than the casings without sand, with an average of 1.53 times. Therefore, we conclude that casing-sand adhesion can improve the cementing bond strength effectively.

Bottom Line: However, due to the lack of detailed study of the technique, many questions remain.The priority orders of key factors are: sand grain size, sand coverage, adhesive curing temperature and adhesive curing time.The optimal parameters recommended for application are: 1.6mm~1.9mm sand grain size, 60%~70% sand coverage, 30°C curing temperature and 60 hours curing time.

View Article: PubMed Central - PubMed

Affiliation: College of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong, China.

ABSTRACT
In the petroleum industry, one of the most serious problems encountered during cementing is the failure at the bonding interface. Many measures including casing-sand adhesion have been developed to improve cementing bond strength. However, due to the lack of detailed study of the technique, many questions remain. The primary goal of this study is to investigate the influence of casing-sand adhesion on cementing bond strength, and to optimize parameters. An orthogonal experiment and a supplementary experiment were conducted. The results indicated that casing-sand adhesion can improve the cementing bond strength. The priority orders of key factors are: sand grain size, sand coverage, adhesive curing temperature and adhesive curing time. The optimal parameters recommended for application are: 1.6mm~1.9mm sand grain size, 60%~70% sand coverage, 30°C curing temperature and 60 hours curing time.

No MeSH data available.


Related in: MedlinePlus