Design of spherical/conical seal structure for tubing or casing remium threaded connections based on Hertz theory
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By using Hertz theory, the location of yielding and the expression of contact center pressure are obtained after interferencefit of the spherical/conical seal structure of premium threaded connections. Combined with the structural characteristics ofpremium threaded connections, the expression of contact pressure is calculated. The magnitude of contact length and contactpressure of spherical/conical seal for premium threaded connections are calculated by using the Herz theory and the resultsare compared with those obtained by the finite element method. According to the calculation results, a CBS4 premiumthreaded connections with a new spherical/conical sealing structure is designed, and finally a machining test is conducted toprove the feasibility of the method. New premium threaded structure is obtained with small errors compared to the resultsof Hertz theory and finite element simulations, which is similar to experimental tests. The research results are applicable toa certain range of tubing or casing premium thread connector.
Abstract
By using Hertz theory, the location of yielding and the expression of contact center pressure are obtained after interferencefit of the spherical/conical seal structure of premium threaded connections. Combined with the structural characteristics ofpremium threaded connections, the expression of contact pressure is calculated. The magnitude of contact length and contactpressure of spherical/conical seal for premium threaded connections are calculated by using the Herz theory and the resultsare compared with those obtained by the finite element method. According to the calculation results, a CBS4 premiumthreaded connections with a new spherical/conical sealing structure is designed, and finally a machining test is conducted toprove the feasibility of the method. New premium threaded structure is obtained with small errors compared to the resultsof Hertz theory and finite element simulations, which is similar to experimental tests. The research results are applicable toa certain range of tubing or casing premium thread connector.