Usage:Drill collars are used to provide weight on bit so that drill pipes are kept in tension. Especially drill collars can keep drill bits centralized and hole track by large rigidity
Material: AISI 4145H, 4145H Mod and Non-magnetic material.
Standard:API Spec7, API Spec7-1 and SY/T Standard.ALSO WE CAN SUPPLY DS-1 and NS-1 STANDARD.
Type:Slick drill collar
Spiral drill collar
Non-magnetic material.
Hard band: Arnco100XT, Arnco200XT and Arnco300XT; Botn1000, Botn3000, TCS8000, TCS-Titanium, Armacor M etc. Also we can make according to customers’ requirements.
Size:OD: 3 1/8”~~11”; ID: 1 1/2”Min. Length:10’~~31’
Detail specification
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Standard size ,bores and connection for Drill Collar
|
|
Style of connection
|
OD
|
ID
|
Length
|
Bevel
|
Bending strength Ratio
|
|
mm
|
in
|
mm
|
in
|
mm
|
diameter mm
|
|
NC23-31
|
79.4
|
3 1/8
|
31.8
|
1 1/4
|
9150
|
76.2
|
2.57:1
|
|
NC26-35(23/8IF)
|
88.9
|
3 1/2
|
38.1
|
1 1/2
|
9150
|
82.9
|
2.42:1
|
|
NC31-41(27/8IF)
|
104.8
|
4 1/8
|
50.8
|
2
|
9150
|
100.4
|
2.43:1
|
|
NC35-47
|
120.7
|
4 3/4
|
50.8
|
2
|
9150
|
114.7
|
2.58:1
|
|
NC3850(31/2IF)
|
127.0
|
5
|
57.2
|
2 1/4
|
9150
|
121.0
|
2.38:1
|
|
NC44-60
|
152.4
|
6
|
57.2
|
2 1/4
|
9150or9450
|
144.5
|
2.49:1
|
|
NC44-62
|
158.8
|
6 1/4
|
57.2
|
2 1/4
|
9150or9450
|
149.2
|
2.91:1
|
|
NC46-62(4IF)
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158.8
|
6 1/4
|
71.4
|
2 13/16
|
9150or9450
|
150.0
|
2.63:1
|
|
NC46-65(4IF)
|
165.1
|
6 1/2
|
57.2
|
2 1/4
|
9150or9450
|
154.8
|
2.76:1
|
|
NC46-65(4IF)
|
165.1
|
6 1/2
|
71.4
|
2 13/16
|
9150or9450
|
154.8
|
3.05:1
|
|
NC46-67(4IF)
|
171.4
|
6 3/4
|
57.2
|
2 1/4
|
9150or9450
|
159.5
|
3.18:1
|
|
NC50-67(41/2IF)
|
171.4
|
6 3/4
|
71.4
|
2 13/16
|
9150or9450
|
159.5
|
2.37:1
|
|
NC50-70(41/2IF)
|
177.8
|
7
|
57.2
|
2 1/4
|
9150or9450
|
164.7
|
2.54:1
|
|
NC50-70(41/2IF)
|
177.8
|
7
|
71.4
|
2 13/16
|
9150or9450
|
164.7
|
2.73:1
|
|
NC50-72(41/2IF)
|
184.2
|
7 1/4
|
71.4
|
2 13/16
|
9150or9450
|
169.5
|
3.12:1
|
|
NC50-77
|
196.8
|
7 3/4
|
71.4
|
2 13/16
|
9150or9450
|
185.3
|
2.70:1
|
|
NC50-80
|
203.2
|
8
|
71.4
|
2 13/16
|
9150or9450
|
190.1
|
3.02:1
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|
6 5/8REG
|
209.6
|
8 1/4
|
71.4
|
2 13/16
|
9150or9450
|
195.7
|
2.93:1
|
|
NC61-90
|
228.6
|
9
|
71.4
|
2 13/16
|
9150or9450
|
212.7
|
3.17:1
|
|
7 5/8REG
|
241.3
|
9 1/2
|
76.2
|
3
|
9150or9450
|
223.8
|
2.81:1
|
|
NC70-97
|
247.6
|
9 3/4
|
76.2
|
3
|
9150or9450
|
232.6
|
2.57:1
|
|
NC70-100
|
254.0
|
10
|
76.2
|
3
|
9150or9450
|
237.3
|
2.81:1
|
|
8 5/8REG
|
279.4
|
11
|
76.2
|
3
|
9150or9450
|
266.7
|
2.84:1
|
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Mechanical Property of Drill Collar
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|
OD
|
Yield Strength
|
Tensile Strength
|
Elongation
|
Brinell Hardness HB
|
Charpy
|
|
mm
|
in inch
|
σ 0.2 Mpa
|
σ b Mpa
|
4%
|
AKVJ
|
|
79.4-171.4
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3 1/8-6 3/4
|
≥758
|
≥965
|
≥13
|
285-341
|
≥54
|
|
177.8-279.4
|
7-11
|
≥689
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≥930
|
|
Stress Relief Groove for Thread Connection
|
|
Style of Connection
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Length between Inner Thread Shoulder and the last Dens
|
Diameter of Inner Thread
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Taper of the Hole nest to inner Thread
|
Outer Thread Diameter
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Length between alternative Inner Thread Shoulder and Stress Relief Groove
|
|
±1.59mm
|
Dcb+0.40,-0
|
±20.83
|
DRG+0 -0.79
|
LRG +0 -3.18
|
|
mm
|
mm/m
|
mm
|
mm
|
|
NC35
|
82.6
|
82.15
|
166.67
|
82.15
|
85.73
|
|
NC38(3 1/2IF)
|
88.9
|
88.11
|
166.67
|
89.3
|
92.08
|
|
NC44
|
101.6
|
101.6
|
166.67
|
106.36
|
104.78
|
|
NC46(4IF)
|
101.6
|
106.76
|
166.67
|
109.93
|
104.78
|
|
NC50(4 1/2IF)
|
101.6
|
117.48
|
166.67
|
120.65
|
104.78
|
|
NC56
|
114.3
|
121.84
|
250
|
134.14
|
117.48
|
|
NC61
|
127
|
132.95
|
250
|
149.25
|
130.18
|
|
NC70
|
139.7
|
152
|
250
|
171.05
|
142.88
|
|
6 5/8REG
|
114.3
|
134.14
|
166.67
|
137.72
|
117.48
|
|
7 5/8REG
|
120.7
|
133.35
|
250
|
162.72
|
123.83
|
|
8 5/8REG
|
123.8
|
149.25
|
250
|
184.94
|
127
|
|
Note: The connection of NC23、26、31 and 2 3/8IF are without stress relief groove mould for their thin wall.
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Package:
1.Standard Senwell export package
2.Requested by customers
Our Services:
1.High quality products with favorable price at right delivery
2.Customized products
3.Warranty
When enquiry, please kindly advise below:
1.Size: as above chart
2.Connection
3.Quantity
4.Port of destination if you need CNF or CIF price
5.Your ideal delivery date if you need the goods urgently
Company Profile
Shaanxi Senwell Drilling Equipment Co., Ltd. (SENWELL) is a comprehensive corporation, of which the business scope is manufacture, trade and sale. SENWELL is located in the center of the high development district which is in the east of Xi'an, Shaanxi Province. Supported by abundant technology resources of the high development district, our company is engaged in designing, researching & developing, testing and manufacturing oilfield equipment and providing relative services.
SENWELL's main products cover 220 types and more than 1000 specifications presently. Our business covers non-magnetic products, drilling stem tools, fishing tools, jarring tools, coring tools, cementing tools, milling tools, well head tools, accessory tools, downhole tools, oil mining equipment, drill equipment, well control systems and pipes.
Today, with strong technology and profuse experience, SENWELL not only provides a comprehensive range of oilfield tools, but also provides tools for machinery industry and has decades of production experience. Main products are sand casting, investment casting, forging, centrifugal casting and machining equipment.
We have a great deal of outstanding and seasoned employees. Relying on advanced equipment and techniques, with the scientific management theory and spirit of seriously dealing with matters relating to works, we have established long-term cooperative relationships with more than a hundred famous and large manufacturers in China. Our company creates a steady-going and reliable environment for our product research, development and sale.
We are based on the tenet of providing consistent high quality products and the best services to meet the strict needs of our customers; to create value for our customers and provide our customers with a return on their investment and the business philosophy of people-oriented, customer first and reliability first. Our products have been successfully exported to Europe, America, the Middle East, South Africa and Southeast Asia. In the international market, we have acquired an excellent reputation among the clients.
We welcome new and old customers from all over the world to contact us for future business relationships and achieving mutual success! To benefit from our strong OEM/ODM capabilities and considerate services, contact us today. We believe you will be better with our support!
