By S.S. Rahman and G.V. Chilingarian (Eds.)
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Extra info for Casing Design Theory and Practice
Axial force. F~, acts to pull apart the pipe of cross-sectional area of As. 1) - - o. 2) 29 where: cry - do - di - minimal yield strength, psi. nominal outside diameter of the pipe, in. inside diameter of the pipe, in. EXAMPLE 2-1" Calculate the pipe-body yield strength for 9g5 in. 472-in. Solution: The minimum yield strength for N-80 steel: cry - 80,000 psi The internal diameter, di" di - 9 . 681in. 57 in. 2 Therefore, from Eq. ,5 % of the gauge length of the specimen. 6 %. Joint strength is the minimal tensile force required to cause the joint to fail.
But the N-grade pipe may exceed 22 Rockwell hardness and is, therefore. not siiital)lr, for H2S service. For sour service. the L-grade pipe w i t h a hardness of 22 or less. or the C-grade pipe can be used. Many non-API grades of pipes are available and widely used i n the drilling industry. 7. These steel grades are used for special applications that require very high tensile strength, special collapse resistance or other propert ies that nnake steel iiiore resistant, to H2S. 6: Strengths of API steel grades.
The two most co11111ioiit Iirratl 17 Thread height . --- Lead --J / / (o) d2 = dl + taper (b) Fig. 7" Basic elements of a thread. The thread taper is the change in diameter per unit distance moved along the thread axis. Thus, the change in diameter. d2 - d l , per unit distance moved along the thread axis. is equal to the taper per unit on diameter. Refer to Figs. 9 and 10 for further clarification. forms are: squared and V-shape. The API uses round and buttress threads which are special forms of squared and \"-shape threads.