Audited Supplier
API 7-1 Drilling String petroleum Spiral oil well Drill well Non Magnetic Drill Collar
A. Slick Drill Collar
Note: Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity. The Drill collar are manufactured strictly from API Spec7-1 and SY5411 standard.
B. Spiral Drill Collar
Note: Spiral drill collar is used to reduce contact area with hole so as to avoid efficiently bit sticking from diffirential pressure. The drill collars are manufactired strictly according to API Spec7-1 and Standard SY5144
C. Spiral Drill Collar With Elevator Groove And Slip Groove
Note: Elevator groove and slip groove made on box thread face of slick drill collar or spiral drill collar can be used as lifting sub and safety slip when trip out. The technical parameters for elevator groove and slip groove is as per API SPEC7-1. Hardbanding is optional at customers' requests.
D. Non-magnetic Drill Collar
The as cold rooled finish on both ID and OD surface with unique technical process strengthen the structure and ensures the tools with optimal resistance to stress,corrosion,cracking and the mechanical performance is greatly enganced.
| Drill collar Model | O.D | I.D | Length | Shoulder chamfer diameter | Reference bend | ||||
| mm | in | mm | in | mm | in | mm | in | Bending strength ratio | |
| NC26-35 | 88.9 | 2003/1/2 | 38.1 | 2001/1/2 | 9150 | 30 | 82.9 | 3-17/64 | 2.42:1 |
| NC31-41 | 104.8 | 2004/1/8 | 50.8 | 2 | 9150 | 30/31 | 100.4 | 3-61/64 | 2.43:1 |
| N038-50 | 127 | 5 | 57.2 | 2002/1/4 | 9150 | 30/31 | 121 | 4-49/64 | 2.38:1 |
| NC46-62 | 158.8 | 2006/1/4 | 71.4 | 2-13/16 | 9150/9450 | 30/31 | 150 | 5-29/32 | 2.63:1 |
| NC46-65 | 165.1 | 2006/1/2 | 57.2 | 2002/1/4 | 9150/9450 | 30/31 | 154.8 | 6-3/32 | 2.76:1 |
| NC46-65 | 165.1 | 2006/1/2 | 71.4 | 2-13/16 | 9150/9450 | 30/31 | 154.8 | 6-3/32 | 3.05:1 |
| NC46-67 | 171.4 | 2006/3/4 | 57.2 | 2002/1/4 | 9150/9450 | 30/31 | 159.5 | 6-9/32 | 3.18:1 |
| NC50-70 | 177.8 | 7 | 57.2 | 2002/1/4 | 9150/9450 | 30/31 | 164.7 | 6-31/64 | 2.54:1 |
| NC50-70 | 177.8 | 7 | 71.4 | 2-13/16 | 9150/9450 | 30/31 | 164.7 | 6-31/64 | 2.73:1 |
| NC56-80 | 203.2 | 8 | 71.4 | 2-13/16 | 9150/9450 | 30/31 | 190.1 | 7-31/64 | 3.02:1 |
| 6-5/8REG | 209.6 | 2008/1/4 | 71.4 | 2-13/46 | 9150/9450 | 30/31 | 195.7 | 7-45/64 | 2.93:1 |
| 7-5/8REG | 241.3 | 2009/1/2 | 76.2 | 3 | 9150/9450 | 30/31 | 223.8 | 8-13/16 | 2.81;1 |
| 8-5/8REG | 279.4 | 11 | 76.2 | 3 | 9150/9450 | 30/31 | 266.7 | 2010/1/2 | 2.84:1 |
| Drill collar thread type: NCXX- digital type; REG-normal type. | |||||||||
Dongying TIANRUI PETROLEUM Technology Co., Ltd., established in November 2003 and located in the Dongying Economic Development Zone, is an investment project in Dongying City. It is mainly engaged in the research, design, manufacturing and technical services of oil drilling and workover tools. The company consists of six departments and two workshops, namely the design department, the quality inspection department, the market operation department, the comprehensive department, the technical service department, the financial department, the processing workshop and the assembly workshop. It possesses rich R & D and design capabilities as well as manufacturing capabilities in oil drilling and workover tools.
1. How do we guarantee quality?
Pre-production samples are always available before mass production;
Always carry out final inspection before shipment;
2. What can you buy from us?
Aluminum plate, aluminum coil, aluminum foil, carbon steel, alloy steel, stainless steel, copper galvanizing, etc
4. What services can we provide?
Accepted delivery conditions: FOB, CIF, FAS, DDP, express;
Accepted payment currencies: US dollar, Australian dollar, Euro and RMB;
Payment types accepted: T/T, L/C, MoneyGram, credit card, PayPal, Western Union remittance, cash;
5.After-sales service: 24-hour online maintenance guidance service.
6.Language: English, Chinese and Other.
