Oilfield drill collar / oil drilling collar API standard
oil drill collar
Descriptions of oil drill collar:
1) Standard: API 7-1
2) Size: 3 1/8"--11"
3) Length: 10'--31'
4) Material: AISI 4145H,AISI4145H mod, Mon-mag material
The spiral drill collars are made of 4145H modified chromium-molybdenum alloy steel according to API Spec.7 and SY/T5144.All threads can be phosphated, copperized or cold worked.All threads are machined with CNC Lathed-Double-shouldered and a special thread, the max diameter of drill collar is 14 inch.
The details of oil drill collar:
1. Material: Non magnetic steel
2. Shape: It is the round pipe with smooth surface and thick wall, and the both ends are machined screw
thread for connection.
3. Use: It is mainly used for the inspection in the process of petroleum drilling.
4. Standard: API Spec 7-1 or SY/T5144 Standard.
5. Inspection&Test: When producing, traceability are maintained from the receipt of raw material to completion of final products, and serial numbers are die-stamped on each workpiece body. During each manufacturing process, inspection and test are performed.
6. Magnetic permeability(MPS=1×105/4∏A/m)
1). Average: Ur<1.010.
2). Magnetic Field Gradient: ΔB≤0.05μT
Main specifications of oil drill collar
Depth of cut
Depth of cut
4 1/2~5 1/8
5 1/4~5 3/4
5 7/8~6 3/8
7 1/8~7 7/8
Note:spiral drill collars has spiral grooves, right hand, well distributes
Oil drill collar
1.We will keep track of each customer to get the feedback of product quality and service. And we will make an amendment according to your feedback.
2.If the product size is wrong, we will send the right one freely.
3.We guarantee the high quality. Please feel free to contact us if you found any damage. We will solve the
4.We can provide product repair services.
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1. How to order the products?
Send the inquiry with detail item description or with Model number.
If there is no packing demand we take it as sea-way packing.
If possible please attach one reference picture to avoid any misunderstanding or any links from our website for we get a better understanding.
2. About lead time and shipping time?
The lead time depend on quantity of order. Usually shipped by sea, small order or urgent order we can send you by air after received your agreement.
According the distance from china to your port, usually from China to European about 25 days. To West of American 20 days.
3.Can I expect a quality products?
Yes. All our activities are accredited to ISO 9001:2008 and API, both in products and services, at the same time, mature production technology ensuring the quality satisfy international request.
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