- Coverage: Grades, tool joints, OD/ID ranges
- Selection: Upset types, applications, matching collars
- Docs: Spec list, inspection options
- Lead time: 1–4 weeks by size
Related:
Drill Pipe ·
Drill Collars ·
HWDP
Not sure which steel grade (E-75 vs S-135) fits your well depth and torque requirements?
[Ask Our Drilling Engineers] for a customized recommendation.
What is an oil drill pipe?
Drill pipe is a steel pipe with a threaded end that is used to connect the surface equipment of the drilling rig to the drilling. And grinding equipment or bottom hole device locating at the bottom of the drilling rig. The purpose of the drill pipe is to transport drilling mud to the bit and to raise, lower, or rotate the bottom hole device with the bit. The drill pipe must be able to withstand tremendous internal and external pressure, distortion, bending and vibration. In the process of oil and gas extraction and refining, drill pipe can be using many times. Drill pipe is dividing into three categories: kelly pipe, drill pipe and weighted drill pipe. The connection sequence is kelly pipe (1 piece)+ drill pipe (n pieces, determined by the well depth)+ weighted drill pipe (n pieces, determined by the drill assembly design).
The common components of the drill string are: drill bit, drill collar, drill pipe, stabilizer, special joint and kelly pipe.
API standard E75 to S135 steel grades from 2 3/8 “to 6 5/8” outside diameter series of oil drill pipe as well as high torsional resistance double shoulder joint drill pipe. And special steel grade BNK C95S drill pipe for sulfur Wells. It is mainly appliing to the construction of deep Wells. Horizontal Wells and extending reach Wells in the process of oil and gas exploration and development.
Drill pipe is dividing into three categories: kelly pipe, drill pipe and weighting drill pipe. The connection sequence is kelly pipe (1 piece)+ drill pipe (n pieces, determined by the well depth)+ weighted drill pipe (n pieces, determined by the drill assembly design).
Kelly pipe
The kelly pipe is located at the top of the drill string. And has two kinds of square and six square.
Effect:
1.When drilling, the kelly is matching with the bushing. And the turntable bushing to transmit the ground rotating torque to the drill pipe to drive the drill string and bit rotation;
2.Bear the full weight of the drill string;
3.Channel for drilling fluid circulation.
Structure：
Kelly pipe consists of upper and lower joints and pipe body parts. The pipe body part is of two kinds of structure (most of the oil drilling is of four square structure). The upper connector is the left female thread (reverse button), connecting with the faucet, in the rotation process of the left female thread to prevent reverse. The lower joint is right-handing male thread and is connecting with the drill pipe. When working, the upper end of the kelly is always above the turntable surface. And the lower part is below the turntable surface.
Drill pipe
Effect：
Drill pipe is the basic component of drill string. Its main function is to transfer torque and transport drilling fluid, and by gradually lengthening the drill pipe to deepen the hole. Therefore, drill pipe plays a very important role in oil drilling.
Structure：
Drill pipe structure Drill pipe is made of random drilling steel pipe, the wall thickness is generally 9 ~ 11mm; The drill pipe body. And the drill pipe joint are composing of two parts. The pipe body and the joint are welding together by friction welding.
Weighted drill pipe
The weighted drill pipe is similar to the oil drill pipe, which is also a hollow steel column with a length of about 10 meters. However, the single weight is heavier than the oil drill pipe. The wall thickness is 2 to 3 times that of the drill pipe. And the drill pipe is connecting between the drill pipe and the drill collar, the purpose is to prevent the fatigue damage when the drill string cross-section changes, and it can also replace the role of a part of the drill collar, but its suspension is simple, the operation is convenient, and the drilling trip time can be saving.
ELITE Kelly Pipe (RFQ)
Q1: What is the general price range per joint or per ton for API 5DP drill pipes?
A: Drill pipe prices typically range from $40 to $120 per meter (or $1,500 – $2,800 per metric ton), depending heavily on the outer diameter (OD), API steel grade (e.g., E-75 vs. S-135), tool joint connection, and raw material market fluctuations. For a precise factory-direct quote (FOB/CIF), please share your required size, grade, quantity, and destination port with our engineering team.
Q2: Do your drill pipes strictly comply with API Spec 5DP and ISO 9001 standards?
A: Yes. All our drill pipes are manufactured strictly under API Spec 5DP (Monogram License No. 5DP-XXXX) and ISO 11961 / ISO 9001 quality management systems. Every pipe undergoes 100% full-length NDT (Non-Destructive Testing), including ultrasonic inspection, magnetic particle testing on tool joints, and hydrostatic testing before leaving the factory.
Q3: Can we get a Mill Test Certificate (MTC) and arrange 3rd-party inspection before shipment?
A: Absolutely. Every shipment is accompanied by a full EN 10204 3.1 Mill Test Certificate (MTC) detailing chemical composition, tensile strength, impact toughness, and hardness test results. We also fully support third-party pre-shipment inspections by SGS, Bureau Veritas (BV), Intertek, or Lloyd’s Register.
Q4: Do you offer hardbanding and Internal Plastic Coating (IPC) for drill pipes?
A: Yes, we offer premium wear-resistant and corrosion-resistant options:
Hardbanding: Casing-friendly alloys including Arnco 100XT/300XT, TCS-3300, or Duraband NC applied on tool joint shoulders and wear pads.
Internal Plastic Coating (IPC): Smooth epoxy/phenolic coatings (e.g., TK-34P or equivalent) applied to pipe body ID to prevent internal corrosion and optimize mud hydraulic flow.
Q5: Are your tool joint threads interchangeable between API NC and IF connections?
A: Yes. Many API Numbered Connections (NC) share identical thread profiles with traditional Internal Flush (IF) connections. For example:
NC26 = 2 3/8″ IF,NC31 = 2 7/8″ IF,NC38 = 3 1/2″ IF,NC50 = 4 1/2″ IF.
All our thread connections are manufactured to API 7-1 dimensional standards using CNC threading machines and verified with API calibrated master gauges.
Q6: What is the actual length difference between Range 1, Range 2, and Range 3 drill pipes?
A: API Spec 5DP classifies pipe lengths into three standard ranges:
Range 1 (R1): 18.0 to 22.0 ft (5.49 – 6.71 m) — Common for workover and mining operations.
Range 2 (R2): 27.0 to 30.0 ft (8.23 – 9.14 m) — The global standard for over 85% of oil and gas drilling rigs.
Range 3 (R3): 38.0 to 45.0 ft (11.58 – 13.72 m) — Preferred for deepwater drillships to minimize makeup connections.
