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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 schematic diagram of testing on the relationship between adhesive curing time and bond strength.(a) schematic diagram. (b) materials.
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pone.0130892.g002: The schematic diagram of testing on the relationship between adhesive curing time and bond strength.(a) schematic diagram. (b) materials.

Mentions: A modified bicomponent-epoxy adhesive was adopted in this experiment, which was developed by Shengli Drilling Technology Research Institute of China. The adhesive is made up of epoxy and curing agent, and recommended ratio of epoxy to curing agent is 2.5:1. The merits of the adhesive are low cost, high strength and resistant to heat, water and chemical. In order to determine the levels of adhesive curing time, an additional test has been carried out on the relationship between curing time and bonding strength. In this test, the adhesive was coated on the contact surface of sample and flagstone, and tensile forces which can separate them were measured in different curing time (Fig 2). Each trial was done twice and got the average value. As shown in Fig 3, the adhesive reaches half of the maximum bond strength after 12 hours curing, reaches maximum bond strength after 36 hours curing and no longer increases after 36 hours curing. Some scholars concluded that, running sand-adhering casing before bond strength reaching the maximum could additionally enhance the bond quality. So we determined three levels of adhesive curing time, i.e. 12 hours (half of the maximum bond strength), 36 hours (the maximum bond strength) and 60 hours (fully cured).


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 schematic diagram of testing on the relationship between adhesive curing time and bond strength.(a) schematic diagram. (b) materials.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0130892.g002: The schematic diagram of testing on the relationship between adhesive curing time and bond strength.(a) schematic diagram. (b) materials.
Mentions: A modified bicomponent-epoxy adhesive was adopted in this experiment, which was developed by Shengli Drilling Technology Research Institute of China. The adhesive is made up of epoxy and curing agent, and recommended ratio of epoxy to curing agent is 2.5:1. The merits of the adhesive are low cost, high strength and resistant to heat, water and chemical. In order to determine the levels of adhesive curing time, an additional test has been carried out on the relationship between curing time and bonding strength. In this test, the adhesive was coated on the contact surface of sample and flagstone, and tensile forces which can separate them were measured in different curing time (Fig 2). Each trial was done twice and got the average value. As shown in Fig 3, the adhesive reaches half of the maximum bond strength after 12 hours curing, reaches maximum bond strength after 36 hours curing and no longer increases after 36 hours curing. Some scholars concluded that, running sand-adhering casing before bond strength reaching the maximum could additionally enhance the bond quality. So we determined three levels of adhesive curing time, i.e. 12 hours (half of the maximum bond strength), 36 hours (the maximum bond strength) and 60 hours (fully cured).

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