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Oil Drill Pipe

Oil Drill pipe Product Description The drill stem / drill string including DP (drill pipe), HWDP (heavy weight drill pipe), DC (drill collar), Kelly etc. The accessories, such as tool joint, drilling tool lifting sub, cross-over sub and so on are also available according to customers'...

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Oil Drill pipe

Product Description

The drill stem / drill string including DP (drill pipe), HWDP (heavy weight drill pipe), DC (drill collar), Kelly etc. The accessories, such as tool joint, drilling tool lifting sub, cross-over sub and so on are also available according to customers' detailed requirements.

Drill pipe, is hollow, thin-walled, steel or aluminium alloy piping that is used on drilling rigs. It is hollow to allow drilling fluid to be pumped down the hole through the bit and back up the annulus. It comes in a variety of sizes, strengths, and wall thicknesses, but is typically 27 to 32 feet in length (Range 2). Longer lengths, up to 45 feet, exist (Range 3).

Drill stem must be designed to transfer drilling torque for combined lengths that often exceed several miles down into the Earth's crust, and also must be able to resist pressure differentials between inside and outside (or vice versa), and have sufficient strength to suspend the total weight of deeper components. For deep wells this requires tempered steel tubes that are expensive, and owners spend considerable efforts to reuse them after finishing a well. A used drill stem is inspected on site, or off location. Ultrasonic testing and modified instruments similar to the spherometer are used at inspection sites to identify defects from metal fatigue, in order to preclude fracture of the drill stem during future well boring. Drill pipe is classed as new (N class), becoming premium (P-class) and finally down to C (C 1 to 3) as fatigue is accumulated and as the outside diameter is worn down by usage. Eventually the drill pipe will be graded as scrap and marked with a red band.

Drill pipe is a portion of the overall drill string. The drill string consists of both drill pipe and the bottom hole assembly (BHA), which is the tubular portion closest to the bit. The BHA will be made of thicker walled heavy weight drill pipe (HWDP) and drill collars, which have a larger outside diameter and provide weight to the drill bit and stiffness to the drilling assembly. Other BHA components can include a mud motor, measurement while drilling (MWD) apparatus, stabilizers, and various specialty downhole tools. The drill stem includes the entire drill string, plus the kelly that imparts rotation and torque to the drill pipe at the top.

See Drilling rig (petroleum) for a diagram of a drilling rig.


Manufacturing Process

Modern drill pipe is made from the welding of at least three separate pieces: box tool joint, pin tool joint, and the tube. The green tubes are received by the drill pipe manufacturer from the steel mill. The ends of the tubes are then upset to increase the cross sectional area of the ends. The tube end may be externally upset (EU), internally upset (IU), or internally and externally upset (IEU). Standard max upset dimensions are specified in API 5DP, but the exact dimensions of the upset are proprietary to the manufacturer. After upsetting, the tube then goes through a heat treating process. Drill pipe steel is commonly quenched and tempered to achieve high yield strengths (135 ksi is a common tube yield strength).

The tool joints (connectors) are also received by the manufacturer as green tubes. After a quench and temper heat treat, the tool joints are cut into box (female) and pin (male) threads. Tool joints are commonly 120 ksi SMYS, rather than the 135 ksi of the tube. They generally are stiffer than the tube, increasing the likelihood of a fatigue failure at the junction. The lower SMYS on the connection increases the fatigue resistance. Higher strength steels are typically harder and more brittle, making them more susceptible to cracking and subsequent stress crack propagation.

Tubes and tool joints are welded using rotary inertia or direct drive friction welding. The tube is held stationary while the tool joint is revolved at high RPMs. The tool joint is the firmly pressed onto the upset end of the tube while the tool joint is rotating. The heat and force during this interaction weld the two together. Once the "ram horns" or excess material is removed, the weld line can only be seen under a microscope. Inertia friction welding is the traditional proven method. Direct drive friction welding is controlled and monitored up to 1000 times a second, resulting in a fine quality weld that does not necessary need a full heat treat quench and temper regime.

Oil Drill pipe Specifications

Technical parameter
Norminal Designation Pipe body Tool joint
Size W/T Grade Up-set OD mm Wall RSC type OD mm ID mm Bevel Dia. of shoulder DF(mm) Pin tong Box tong OD of upset neck torsion
2 3/8 6.65 E EU 60.32 7.11 NC26 85.7 45.45 82.95 177.8 203.2 65.09 1.1
X 85.7 45.45 82.95 177.8 203.2 65.09 0.87
G 85.7 45.45 82.95 177.8 203.2 65.09 0.79
2 7/8 10.4 E EU 73.02 9.19 NC31 104.8 53.98 100.41 177.8 228.6 80.96 1.03
X 104.8 50.8 100.41 177.8 228.6 80.96 0.9
G 111.1 50.8 100.41 177.8 228.6 80.96 0.82
S 41.28 100.41 177.8 228.6 80.96 0.82
3 1/2 13.3 E EU 88.9 9.35 NC38 120.7 68.26 116.28 203.2 266.7 98.43 0.98
X 127 65.09 116.28 203.2 266.7 98.43 0.87
G 127 61.91 116.28 203.2 266.7 98.43 0.86
S 127 53.98 116.28 203.2 266.7 98.43 0.8
E 11.4 127 65.09 116.28 203.2 266.7 98.43 0.97
X 127 61.91 116.28 203.2 266.7 98.43 0.83
G 127 53.98 116.28 203.2 266.7 98.43 0.9
15.5 S NC40 139.7 57.15 127.4 177.8 254 98.43 0.87
4 14 E IU 101.6 8.38 NC40 133.4 71.44 127.4 177.8 254 106.36 1.01
X 133.4 68.26 127.4 177.8 254 106.36 0.86
G 139.7 61.91 127.4 177.8 254 106.36 0.93
S 139.7 50.8 127.4 177.8 254 106.36 0.87
E EU NC46 152.4 82.55 145.26 177.8 254 114.3 1.43
X 152.4 82.55 145.26 177.8 254 114.3 1.13
G 152.4 82.55 145.26 177.8 254 114.3 1.02
S 152.4 76.2 145.26 177.8 254 114.3 0.94
4.5 16.6 E IEU 114.3 8.56 NC46 158.8 82.55 145.26 177.8 254 119.06 1.09
X 158.8 72.6 145.26 177.8 254 119.06 1.01
G 158.8 76.2 145.26 177.8 254 119.06 0.91
S 158.8 69.85 145.26 177.8 254 119.06 0.81
20 E 10.92 158.8 76.2 145.3 177.8 254 119.07 1.07
X 158.8 69.85 145.3 177.8 254 119.07 0.96
G 158.8 63.5 145.3 177.8 254 119.07 0.96
S 158.8 57.15 145.3 177.8 254 119.07 0.81
16.6 E EU 8.56 NC50 168.3 95.25 154 177.8 254 127 1.23
X 168.3 95.25 154 177.8 254 127 0.97
G 168.3 95.25 154 177.8 254 127 0.88
S 168.3 88.9 154 177.8 254 127 0.81
20 E 10.92 168.3 92.08 154 177.8 254 127 1.07
X 168.3 88.9 154 177.8 254 127 0.96
G 168.3 88.9 154 177.8 254 127 0.96
S 168.3 76.2 154 177.8 254 127 0.81
5 19.5 E IEU 127 9.19 NC50 168.3 95.25 154 177.8 254 130.18 1.23
X 168.3 88.9 154 177.8 254 130.18 0.97
G 168.3 82.5 154 177.8 254 130.18 0.88
S 168.3 69.85 154 177.8 254 130.18 0.81
25.6 E 12.7 168.3 88.9 154 177.8 254 130.18 1.02
X 168.3 76.2 154 177.8 254 130.18 0.96
G 168.3 69.85 154 177.8 254 130.18 0.86
S 0.87
19.5 E 9.19 51/2FH 177.8 95.25 170.7 203.2 254 130.18 1.53
X 177.8 95.25 170.7 203.2 254 130.18 1.21
G 177.8 95.25 170.7 203.2 254 130.18 1.09
S 184.2 88.9 170.7 203.2 254 130.18 0.98
25.6 E 12.7 177.8 88.9 170.7 203.2 254 130.18 1.21
X 177.8 88.9 170.7 203.2 254 130.18 0.95
G 184.2 88.9 170.7 203.2 254 130.18 0.99
S 184.2 82.55 170.7 203.2 254 130.18 0.83
5 1/2 21.9 E IEU 139.7 9.17 177.8 101.6 170.7 203.2 254 144.46 1.11
X 177.8 95.25 170.7 203.2 254 144.46 0.98
G 184.2 88.9 170.7 203.2 254 144.46 1.02
S 190.5 76.2 180.2 203.2 254 144.46 0.96
24.7 E 10.54 177.8 101.6 170.7 203.2 254 144.46 0.99
X 184.2 88.9 170.7 203.2 254 144.46 1.01
G 184.2 88.9 170.7 203.2 254 144.46 0.92
S 190.5 76.2 180.2 203.2 254 144.46 0.86
6 5/8 25.2 E IEU 168.3 8.38 65/8FH 203.2 127 195.7 203.2 279.4 176.21 1.04
X 203.2 127 195.7 203.2 279.4 176.21 0.82
G 209.6 120.65 195.7 203.2 279.4 176.21 0.87
S 215.9 107.95 195.7 203.2 279.4 176.21 0.86
27.7 E 9.19 203.2 127 195.7 203.2 279.4 176.21 0.96
X 209.6 120.65 195.7 203.2 279.4 176.21 0.89
G 209.6 120.65 195.7 203.2 279.4 176.21 0.81
S 215.9 107.95 195.7 203.2 279.4 176.21 0.8


FAQ

How to order?

Please send us your inquiry with detail item description or with Model number.

If there is no packing demand we take it as our regular exported standard packing.

We will offer you an order form for filling. We will recommend you the most suitable model according to information you offered.

You send us your detail requirement, we provide quotation to you.

Can I expect a quality products?

All the production and processing are strictly according to ISO 9001:2008 and API standard. At the same time, mature production technology ensuring the quality satisfy international request. We also welcome the third party inspection, such as BV, SGS and TUV.

The information you may like to know before Payment:

1. Methods of Payment:

T/T (Telegraphic Transfer) or L/C at sight

2. Shipping way

Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or by air

Bulk order: we suggest by air or by sea.

3. Quality Control

We have our own experienced QC.

There will be strict inspection and testing for every order before shipping out.



ROSCHEN GROUP is professional in manufacturing and supplying quality oil drill pipe as one of the leading manufacturers and suppliers in China. We now bring you high quality oil drill pipe for sale, competitive in its excellent performance and high precision. Please rest assured to buy.
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