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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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Drill String: Composition and Design 749<br />

TAPERED ELEVATOR SHOULDER (SEAT)<br />

HEAT AFFECTED ZONE<br />

(NOT visieu ON DRILL<br />

UPSET DRILL PIPE, SEE SEC. B- I PAGE 9<br />

TONG AREA<br />

HARDFACED<br />

AREA<br />

PIN RELIEF GROOVE ’<br />

OR PIN BASE RADIUS<br />

MAKE L BREAK<br />

SHOULDER<br />

\-SQUARE<br />

ELEVATOR<br />

SHOULDER<br />

(SEAT)<br />

LAST ENCAGED THREAD PIN 7 r- LAST ENGAGED THREAD - BOX<br />

LENGTH <strong>OF</strong> PIN<br />

LENGTH <strong>OF</strong> BOX<br />

Figure 4-133. Tool joint nomenclature [30].<br />

HARDFACING IS AN<br />

OPTIONAL FEATURE<br />

Heavy-Weight Drill Pipe<br />

Heavy-weight drill pipe (with wall thicknesses of approximately 1 in.) is<br />

frequently used for drilling vertical and directional holes (Figure 4134). So far,<br />

there is no sound, consistent, engineering theory of drill string behavior while<br />

(texf continued on page 760)

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