Abstract
Abstract During the past few decades, the technologies of the higher-shot densities, larger perforating guns and tubing-conveyed perforation (TCP) combined well testing have been used widely used for well completions. This results in a large increase of impact loads in the tubing during TCP. The safety of the tubing is directly related to the success of perforation combined well test,which is the key link in the oil and gas production. In this study, the influence factors of perforating impact load have firstly been analyzed. Also the dynamic response of tubing during TCP in three dimensions has been studied by numerical simulation. According to the computing results, the vulnerable parts of tubing during TCP have been found, where the axial impact load is the strongest and it is concluded that the axial shock absorber has the optimal installation position to achieve the best shock absorption effect, which is verified by the case. This study proposes a novel method for the safety analysis of the tubing, which has important significance to provide guidance for the design of field perforating operations and to improve security.
Highlights
During the past few decades, the technologies of the higher-shot densities, larger perforating guns and tubing-conveyed perforation (TCP) combined well testing have been used widely used for well completions
According to the computing results, the vulnerable parts of tubing during TCP have been found, where the axial impact load is the strongest and it is concluded that the axial shock absorber has the optimal installation position to achieve the best shock absorption effect, which is verified by the case
The theory analysis shows that the number of bullets, the charge, the size of the pipe string, the initial wellbore pressure are the factors affecting perforating impact load
Summary
Abstract: During the past few decades, the technologies of the higher-shot densities, larger perforating guns and tubing-conveyed perforation (TCP) combined well testing have been used widely used for well completions. It is indicated that the effect of all perforating design elements and dimensions could be analyzed, such as the length of perforated interval and guns loading strategy, types and sizes of guns and shaped charges, cable type and size, wellbore fluid properties and initial pressure, reservoir pressure and properties, position of packers and production tubing size, size and length of conveyance, type and number of shock absorbers and rathole length [6,7,8] These studies set a foundation for further research on the shock damage of perforating impact load. The effects of charge quantity of perforating bullet, the number of shock absorbers, and the length of oil tube on the dynamic response of oil tube and packer were investigated [16] In these studies, the focus was put on the impact load on the string system. The research has great significance on understanding the influence of impact load on tubing during perforating, providing guidance for the design of perforation, and improving the security of operations
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