Standard drill pipes are long tubular sections of pipe that make up the majority of the drill string. They are typically a 31-foot long section of tubular pipe but may be anywhere from 18 to 45 feet in length.

Heavy weight drill pipe (HWDP) is a tubular pipe that adds weight or acts as a transitional piece in the drill string. As a transitional section of the drill string, it is placed between the drill collar and standard drill pipe to reduce fatigue failures.

In other applications, the HWDP is used as an additional weight to weigh down the drill string.

Drill collars are a component of the drill string that makes up part of the BHA. They are thicker-walled, heavier, and more rigid than drill pipes and are primarily used to weigh down the drill bit while dampening vibration and impact forces.

API 5DP Drill Pipe Standard and Grades:
API 5DP Grade DZ50,
General Grade of Drill Pipe API 5DP Grade E75,
General Grade of Drill Pipe API 5DP Grade R780,
Medium high grade of Drill Pipe API 5DP Grade X95,
High-grade Drill Pipe API 5DP Grade G105,
High-grade Drill Pipe API 5DP Grade S135

API RP 5A5 – This International Standard specifies requirements and gives recommendations for field inspection and testing of oil country tubular goods (OCTG). This International Standard covers the practices and technology commonly used in field inspection; however, certain practices may also be suitable for mill inspections.

Range of Sizes: 2 3/8” to 5 1/2”
Range of Thickness: 6.5mm to 12.7mm
Length: R1, R2, R3

Range 1 (R1) is shortest in length, more common for sizing production tubing or casing, and ranges from 18 to 22 ft.

Range 2 (R2) is considered the standard length for drill pipe and ranges from 27 to 31 ft.

Range 3 (R3) is common in the casing and is also deployed in deepwater drilling applications. The increased length decreases the number of tool joints in each stand of drill pipe.

The fallback is that the load exerted on each tool joint is greater increasing wear and reducing the expected life of the drill pipe. R3 ranges from 38 to 45 ft.

The drilling tool is a connected drill rod for transferring power. The drill string is usually part are a drill, drill collars, drill pipe, stabilizers, special connectors, and Kelly.

The basic role of the drill string are: (1)control the drill bit; (2) imposed WOB; (3) transmission of power; (4) transporting drilling fluid; (5) special operations: extrusion of cement, handling underground accidents.

API 5DP drill pipe is trailing with screw thread for connecting the drilling rig located at the bottom of surface drilling equipment and mill equipment or bottom outlet device.

The purpose is to drill the drilling mud delivered to the drill bit and drill with the increase, decrease, or rotating bottom outlet means.

Drill pipe must be able to withstand great external pressure, twisting, bending, and vibration. In the mining and oil and gas refining process, the drill pipe can be used multiple times.