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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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770 Drilling and Well Completions<br />

. .. .<br />

Dbmond 811<br />

(Plowing I<br />

Grinding)<br />

Roller Cone Bit<br />

(Crushing)<br />

. , . :_.<br />

Oirmond Compact PCD<br />

Bit<br />

(Shearing 1<br />

Figure 4-135. Rock cutting mechanics of different bit types [43A]. (Courtesy<br />

Hughes Christensen.)<br />

Figure 4-1 36. 1987 IADC roller bit classification chart.<br />

and designate soft, soft to medium, medium, hard, and extremely hard formations,<br />

respectively.<br />

Types. There are four grades of hardness in each series. These four grades (or<br />

types) are numerically 1, 2, 3 and 4.<br />

Features. Seven categories of bearing design and gauge protection are defined<br />

as features. Features 8 and 9 are reserved for future use.

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