America United Petroleum

Specifications

Standard Sizes, Bores, and Connections for Drill Collars (API Spec 7)

DRILL COLLAR NUMBER OR SIZE TYPE MINUMUM OD BORE TOL.+1/16 (B) LENGTH (FT) TOL.+6" (C) BENDING STRENGTH RATIO (2) APPROX.WEIGTH OF 31 FT DRILL COLLAR (LB)
8 5/8 REG. (1) 11 3 30 2.78:1 8970 (3)
N.C. 26-35 (2 3/8 I.F.) 3 1/2 1 1/2 30 2.42:1 800 (3)
N.C. 31-41 (2 7/8 I.F.) 4 1/8 2 30 2.43:1 1040 (3)
N.C. 38-47 (3 1/2 I.F.) 4 3/4 2 1/4 31 1.85:1 1450
N.C. 38-50 (3 1/2 I.F.) 5 2 1/4 31 2.38:1 1650
N.C. 44-60 6 2 1/4 31 2.49:1 2650
N.C. 44-60 6 2 13/16 31 2.84:1 2350
N.C. 44-62 6 1/4 2 1/4 31 or 32 2.91:1 2810
N.C. 46-62(4 I.F.) 6 1/4 2 13/16 31 or 32 2.63:1 2600
N.C. 46-65 (4 I.F.) 6 1/22 1/4 31 or 32 2.76:1 3090
N.C. 46-65 (4 I.F.) 6 1/2 2 13/16 31 or 32 3.05:1 2880
N.C. 46-67 (4 I.F.) 6 3/4 2 1/4 31 or 32 3.18:1 3360
N.C. 50-70 (4 1/2 I.F.) 7 2 1/4 31 or 31 2.54:1 3640
N.C.50-70 (4 1/2 I.F.) 7 2 13/16 31 or 32 2.73:1 3440
N.C.50-72 (4 1/2 I.F.) 7 1/4 2 13/16 31 or 32 3.12:1 3710
6 5/8 REG 8 2 13/16 31 or 32 2.60:1 4680
6 5/8 REG 8 1/4 2 13/16 31 or 32 2.93:1 5020
7 5/8 REG. 9 1/2 3 31 or 32 2.81:1 6730
7 5/8 REG. (1) 9 3/4 3 31 or 32 3.09:1 7130
8 5/8 REG. (1) 11 3 30 2.78:1 8970 (3)

Optional feature include cold rolled thread roots, modified bore back boxes and API stress relief grooved pins, and slip and elevator recesses. Mill chemical and physical certification with each order upon customer request.

    1. Low torque face.
    2. Ratio of box to pin section modulus See API Spec RP 7G for Explanation.
    3. 30-foot length drill collar

All dimensions in inches, unless otherwise specified.