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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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760 Drilling and Well Completions<br />

1<br />

/EXTRA<br />

LONG JOINTS<br />

(A) MORE BEARING<br />

AREA REDUCES<br />

WEAR<br />

(6) MORE LENGTH<br />

FOR<br />

RECUTTING<br />

CONNECTIONS<br />

HEAVY WALL TUBE<br />

PROVIDES<br />

MAXIMUM WEIGHT<br />

PER FOOT<br />

HARDFACI NG<br />

ON EIJDS AND<br />

CENTER SEC-<br />

TION (OPTIONAL)<br />

FOR LONGER<br />

LIFE<br />

CENTER UPSET<br />

(A) INTEGRAL PART<br />

<strong>OF</strong> TUBE<br />

(B) REDUCES WEAR<br />

ON CENTER <strong>OF</strong><br />

TUBE<br />

EXTRA LONG JOINTS<br />

(A) MORE BEARING<br />

AREA REDUCES<br />

WEAR<br />

(6) MORE LENGTH<br />

FOR<br />

RECUTTING<br />

CONNECTIONS<br />

Figure 4-134. Drilco's Hevi-Wate' drill pipe [42].<br />

(text continued from page 749)<br />

drilling. However, based on field experience, if a heavy-weight drill pipe above<br />

the drill collars is used, it reduces drill pipe failure. The failure of regular drill<br />

pipe and tool joints is influenced by several factors. Probably the most important<br />

one is a cyclic bending stress reversal resulting from the accidental running of<br />

drill pipe in compression, the centrifugal force effect or passing through short<br />

and sharp dog-legs, or a combination of these factors. In directional drilling, a

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