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Improving the Quality of Petroleum Casing Pipe Application to the Worksites by Reducing the Thread Gluing

Cao Zhong  
After the analysis of experiments about making- up and breaking- out of casing pipes under 13 different conditions, it is ex- pounded that the experimental result is affected by the factors involving the thread sealant, the excess torque, the deformation of collar under the force and the thread alternating while making up. Meanwhile, it is pointed out that the smearing of the thread sealant and its quality have a great effect on making- up and breaking- out of casing pipes, sealing property and gluing tendency, whereas the ex- cess torque, deformation of collars and the thread alternating will result in the serious thread gluing.
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