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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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804 Drilling and Well Completions<br />

term profile is used here to describe the cross-section of the cutter/bottomhole<br />

pattern. This distinction is made because the cutter/bottomhole profile is not<br />

necessarily identical to the bit body profile.<br />

Nine basic bit profiles are defined by arranging two profile parameters-outer<br />

taper (gage height) and inner concavity (cone height)-in a 3 x 3 matrix (Figure<br />

4-159). The rows and columns of the matrix are assigned high, medium and<br />

low values for each parameter. Gage height systematically decreases from top<br />

to bottom. Cone height systematically decreases from left to right. Each profile<br />

is assigned a number.<br />

BIT PR<strong>OF</strong>ILES<br />

LONG TAPER<br />

DEEP CONE<br />

LONG TAPER<br />

MEDIUM CONE<br />

MEDIUM TAPER<br />

DEEP CONE<br />

MEDIUM TAPER<br />

MEDIUM CONE<br />

'DOUBLE CONE'<br />

MEDIUM TAPER<br />

SHALLOW CONE<br />

'ROUNDED'<br />

I<br />

7<br />

I<br />

9<br />

SHORT TAPER<br />

PEEP CONE<br />

INVERTED'<br />

SHORT TAPER<br />

MEDIUM CONE<br />

SHORT TAPER<br />

SHALLOW CONE<br />

'FLAT'<br />

Figure 4-159. Nine basic profiles of fixed-cutter bits [54]. (Courtesy SPE.)

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