Drill Rod Material Properties

Small rotary drilling rigs often use drill rod as a drill pipe substitute. Drill rod is used in mining, environmental, and geotechnical drilling operations. These rods are available in 2 ft, 5 ft, and 10 ft lengths. They are used in both mud (or water) and air drilling operations. There are two types of drill rods, wireline drill rods, and conventional drill rods.

Wireline Drill Rod

Figure 3-23 shows a schematic profile of wireline drill rod. This type of drill rod has no change in inside diameter at the connections (smooth bore over entire length). This allows wireline coring to proceed through the drill rod. The outside of the rod is also smooth with no increase in outside diameter at the tool joints. The connections are not API but are shouldered connections which give adequate strength in shallow rotary drilling operations.

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Awj Drill Rod

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Figure 3-23: Wireline drill rod schematic profile of rod body, and box and pin connections (courtesy Boart Longyear Incorporated).

Table 3-4 gives dimensions and mechanical properties for AQ, BQ, NQ, and HMQ wireline drill rod. Wireline drill rod is available in 5 ft and 10 ft lengths (and custom lengths). This drill rod type is used in the rotary drilling operations where core retrieval is the principal objective. These are usually shallow small diameter boreholes. This drill rod type was originally developed for mining drilling operations but is now used extensively in environmental and geotechnical drilling operations.

Table 3-4: Wireline drill rod dimensions and mechanical properties (courtesy of Boart Longyear Incorporated).

AQ

BQ

NQ

HMQ

Rod Body OD

1.75 in

2.19 in

2.75 in

3.50 in

ID

1.38 in

1.81 in

2.38 in

3.06 in

Wt/ft

3.14 lb/ft

4.02 lb/ft

5.24 lb/ft

7.69 lb/ft

Max OP Torque

240 ft-lb

340 ft-lb

560 ft-lb

1,100 ft-lb

Max MU Torque

350 ft-lb

470 ft-lb

710 ft-lb

1,200 ft-lb

Wall Profile

Parallel

Parallel

Parallel

Parallel

Standard Conventional Drill Rod

Figure 3-24 shows a schematic profile of standard conventional drill rod. This type of drill rod has a much stronger connection (an abrupt change in inside diameter at the tool joint). The outside of the rod is smooth with no increase in outside diameter at the tool joints. The connections are API threaded shouldered connections.

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Figure 3-24: Standard conventional drill rod schematic profile of rod body, and box and pin connections (courtesy Boart Longyear Incorporated).

Table 3-5 gives dimensions and mechanical properties for AWJ, AWJ Lightweight, and NWJ standard conventional drill rod. Standard conventional drill rod is available in 2 ft, 5 ft and 10 ft lengths (and custom lengths). The standard conventional rod type is used in shallow small diameter borehole drilling operations. These drilling rods are used exclusively for direct circulation operations. These rods have been traditionally used in mining and geotechnical drilling operations, but there is increased use of this drill rod type for drilling shallow small diameter environmental monitoring wells.

Table 3-5: Standard conventional drill rod dimensions and mechanical properties (courtesy of Boart Longyear Incorporated).

AWJ

AWJ-LT

NWJ

Rod Body OD

1.75 in

1.75 in

2.63 in

ID

1.375 in

1.50 in

2.250 in

Tool Joint OD

1.75 in

1.75 in

2.63 in

ID

0.63 in

0.63 in

1.13 in

Wt/ft (approx.)

3.22 lb/ft

2.35 lb/ft

5.18 lb/ft

Max OP Torque

300 ft-lb

300 ft-lb

650 ft-lb

Max MU Torque

300 ft-lb

300 ft-lb

580 ft-lb

Wall Profile

Internal Upset

Internal Upset

Internal Upset

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  • alison
    What is a nwj drill rod connection?
    8 years ago

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