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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 filtered sand and inner tubes adhered with sand.(a) Filtered building sand. (b) inner tubes adhered with sand of different size.
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pone.0130892.g005: The filtered sand and inner tubes adhered with sand.(a) Filtered building sand. (b) inner tubes adhered with sand of different size.

Mentions: The interfacial shear strength adopted in this study refers to the shear stress when the casing-cement interface slips. The principles and materials are shown in Fig 4, the model is composed of two cemented tubes and an annular base. The inner and outer tube diameter and height are 73mm, 120mm and 140mm, 100mm. The inner diameter of the annular base is 83mm which is slightly larger than the diameter of inner tube. During the model preparation, the surface of inner tube should be adhered with filtered building sand (Fig 5) and make sure the two tubes were concentric and aligned in one end before cementing. Shengwei G-cement of 0.44 water-cement ratio was injected into the annulus between inner and outer tubes, having time of curing 24 hours at room temperature and normal pressure, another 4 days at 75°C and normal pressure. After cement setting, the model was put on the annular base, and fixed by the groove. Then pressed the model on the press machine (Fig 6B) and record the maximum force when the inner tube slipped. The press machine NYL-300 with maximum range of 300KN adopted is shown in Fig 6A.


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 filtered sand and inner tubes adhered with sand.(a) Filtered building sand. (b) inner tubes adhered with sand of different size.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0130892.g005: The filtered sand and inner tubes adhered with sand.(a) Filtered building sand. (b) inner tubes adhered with sand of different size.
Mentions: The interfacial shear strength adopted in this study refers to the shear stress when the casing-cement interface slips. The principles and materials are shown in Fig 4, the model is composed of two cemented tubes and an annular base. The inner and outer tube diameter and height are 73mm, 120mm and 140mm, 100mm. The inner diameter of the annular base is 83mm which is slightly larger than the diameter of inner tube. During the model preparation, the surface of inner tube should be adhered with filtered building sand (Fig 5) and make sure the two tubes were concentric and aligned in one end before cementing. Shengwei G-cement of 0.44 water-cement ratio was injected into the annulus between inner and outer tubes, having time of curing 24 hours at room temperature and normal pressure, another 4 days at 75°C and normal pressure. After cement setting, the model was put on the annular base, and fixed by the groove. Then pressed the model on the press machine (Fig 6B) and record the maximum force when the inner tube slipped. The press machine NYL-300 with maximum range of 300KN adopted is shown in Fig 6A.

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