By Don W. Dareing
Box operations of drillstrings and marine risers are advanced and require the ability of specialists with engineering wisdom and adventure. the target of this booklet is to supply analytical instruments to aid in designing and working those lengthy tubulars. Closed shape recommendations are emphasised all through. This e-book is meant for early-career and complex engineers and their managers desirous about offshore drilling Read more...
summary: box operations of drillstrings and marine risers are complicated and require the ability of specialists with engineering wisdom and adventure. the target of this e-book is to supply analytical instruments to help in designing and working those lengthy tubulars. Closed shape ideas are emphasised all through. This publication is meant for early-career and complex engineers and their managers curious about offshore drilling and petroleum-extraction operations. it is going to function a reference for the practising engineer in addition to a textual content for brief classes designed for carrying on with schooling education
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Also, P = p0A0 – pi Ai. Direct integration gives d 2y + b y = C1x + C2 dx2 (2-39) where b= F -P EI The symbol, b, is chosen to be consistent with an effective tension term, which will be introduced later. 42 • Mechanics of Drillstrings and Marine Risers The particular solution to Eq. (2-39) is yp = 1 (C1x + C2 ) b (2-40) The complimentary solution is yc (x ) = C3 sin b x + C4 cos b x (2-41) The total solution to Eq. (2-38) is therefore y(x ) = C1 x + C2 + C3 sin b x + C4 cos b x (2-42) Assuming the pipe is structurally pinned at top and bottom end, boundary conditions, are y(0) = 0 y(L ) = 0 d 2y (0) = 0 dx2 d 2y ( L) = 0 dx2 Applying these boundary conditions to Eq.
Of Petroleum Technology, 1960. 54. William C. , Tulsa, OK, 1980. Chapter 2 MECHANICS OF LONG BEAM COLUMNS Beam columns are defined as structural beams subjected to axial and transverse loads. Buckling of columns is often analyzed separately in consideration of boundary conditions. Axial forces are assumed to be constant throughout. Beam response to these loads, whether considered separately or combined, is well documented [1,2]. Mechanics of long vertical beam columns is similar but complicated by linear changes in internal axial forces (caused by gravity) and variations in fluid pressure (internal and external) applied along the beam (pipe).
This tool was the industry’s first measurement-while-drilling (MWD) tool. Downhole data was obtained at several drilling location in West Texas, Oklahoma, Louisiana, and Alberta, Canada during the early 1960s [27]. The data was unique and special and much credit is due those who planned, designed, built and tested this tool over a 3 year period. An example of real time bit force and torque, as measured by EPRCo’s downhole recording tool, is shown in Fig. 1-5. Rotary speed was between 80 and 90 rpm.