Make-up torque is the most important factor affecting the quality of oil casing and tubing.The torque of the premium connection with a torque shoulder comprises three parts:the thread,sealing surface,and shoulder torq...Make-up torque is the most important factor affecting the quality of oil casing and tubing.The torque of the premium connection with a torque shoulder comprises three parts:the thread,sealing surface,and shoulder torque.According to the thick-wall cylinder theory,the formula for the connection with a torque shoulder is derived by establishing a mathematical model.The results show that the thread interference deviation and shoulder force significantly impact the torque values.The experimental results demonstrate that the derived formula can accurately reflect the actual make-up process and provide a theoretical basis for the precise control of connection make-up.Therefore,it has a great practical significance for oil and gas production safety.展开更多
In order to analyze the sealing performance of a new designed premium threaded connection,this paper studies the sealing reliability and sensitivity of the premium threaded connection at its most dangerous load condit...In order to analyze the sealing performance of a new designed premium threaded connection,this paper studies the sealing reliability and sensitivity of the premium threaded connection at its most dangerous load condition based on Kriging model.The load condition of premium threaded connection in deep well is so complex that the most dangerous load point of premium threaded connection under the typical series loads is studied by finite element analysis(FEA) method firstly.Since the FEA of the premium threaded connection is too time-consuming,Kriging model which is accurate and efficient for multidimensional and highly nonlinear problems is built to calculate the sealing reliability of the premium threaded connection at the most dangerous load point.Finally,the sealing sensitivity analysis of the premium threaded connection is performed by the method of variance-based global sensitivity analysis.The work in this paper could contribute for the analysis and further improvement of the premium threaded connection.展开更多
Premium thread connection tubing and casing products are non-API products that are used in severe oil field conditions, such as deep wells ,ultra deep wells, high pressure gas wells, horizontal wells and steam injecti...Premium thread connection tubing and casing products are non-API products that are used in severe oil field conditions, such as deep wells ,ultra deep wells, high pressure gas wells, horizontal wells and steam injection wells, etc. In order to meet the requirements of oilfields for premium thread connection oil country tubular goods （ OCTG）, Baosteel developed its own series of premium thread connection tubing and casing products that are protected by intellectual property rights. This study introduces the process of developing the premium thread connection tubing and casing products, their characteristics, and their actual application in oil fields. It hopes to give customers a better understanding of Premium thread connection tubing and casing products from Baosteel.展开更多
文摘Make-up torque is the most important factor affecting the quality of oil casing and tubing.The torque of the premium connection with a torque shoulder comprises three parts:the thread,sealing surface,and shoulder torque.According to the thick-wall cylinder theory,the formula for the connection with a torque shoulder is derived by establishing a mathematical model.The results show that the thread interference deviation and shoulder force significantly impact the torque values.The experimental results demonstrate that the derived formula can accurately reflect the actual make-up process and provide a theoretical basis for the precise control of connection make-up.Therefore,it has a great practical significance for oil and gas production safety.
文摘In order to analyze the sealing performance of a new designed premium threaded connection,this paper studies the sealing reliability and sensitivity of the premium threaded connection at its most dangerous load condition based on Kriging model.The load condition of premium threaded connection in deep well is so complex that the most dangerous load point of premium threaded connection under the typical series loads is studied by finite element analysis(FEA) method firstly.Since the FEA of the premium threaded connection is too time-consuming,Kriging model which is accurate and efficient for multidimensional and highly nonlinear problems is built to calculate the sealing reliability of the premium threaded connection at the most dangerous load point.Finally,the sealing sensitivity analysis of the premium threaded connection is performed by the method of variance-based global sensitivity analysis.The work in this paper could contribute for the analysis and further improvement of the premium threaded connection.
文摘Premium thread connection tubing and casing products are non-API products that are used in severe oil field conditions, such as deep wells ,ultra deep wells, high pressure gas wells, horizontal wells and steam injection wells, etc. In order to meet the requirements of oilfields for premium thread connection oil country tubular goods （ OCTG）, Baosteel developed its own series of premium thread connection tubing and casing products that are protected by intellectual property rights. This study introduces the process of developing the premium thread connection tubing and casing products, their characteristics, and their actual application in oil fields. It hopes to give customers a better understanding of Premium thread connection tubing and casing products from Baosteel.
