By S.S. Rahman and G.V. Chilingarian (Eds.)
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5C3, 1989). There are other loads, however, that may be of equal or greater importance and are often limiting factors in the selection of casing grades. These loads include" wear, corrosion, vibration and pounding by drillpipe, the effects of gun perforating and erosion. In this chapter, the sources and characteristics of the loads which are important to the casing design and the formulas to compute them are discussed. R O'u ~y ELASTIC LIMIT STRESS L v STRAIN Fig. 1" Elastoplastic material behavior with transition range.
SPE, pp. 132-172. R. , 1962. Well Design" Drilling and Production. J, USA, pp. 108-109. , 1987. Fundamentals of Casing Design. Graham & Trotman, London, UK, pp. 1-2:]. , 1984. How loading affects tubular thread shoulder seals. Petrol. Engr. , 56" 43-52. This Page Intentionally Left Blank 27 Chapter 2 PERFORMANCE P R O P E R T I E S OF C A S I N G UNDER LOAD C ONDITIONS Casing is subjected to different loads during landing, cementing, drilling, and production operations. The most importaI:t loads which it must withstand are: tensile, burst and collapse loads.
2 7 ) dx 2 Combining Eqs. 28) E1 From Fig. 4, the bending moment Mx at any distance x (where x < lj, the joint length) is given by: x 2 Mx - Ms + Fay + Fwx - H/~ "2 sin 0 - lk~ x y' cos 0. 29) where: & = F~ = Ms = y and y' = axial force, lbf. force exerted by the borehole wall at the couplings, lbf. bending moment at O, ft-lbf. 4. The last two terms of Eq. 29 are small and for simplicity they are neglected. Similarly, the axial tension, Fa, is considered to be constant throughout the pipe. Thus, substituting Eqs.