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DRILL COLLARS
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DRILLING TOOLS
Product description

Drill collars are manufactured from AISI 4145H or 36CrNiMo4 modified steel, and are supplied in the" as rolled" surface finish condition. Alternative surface finishes can be provided.
Trepanning and Heat treatment:
Drill collars are trepanned and drifted to API Spec 7. Full-length heat-treatment processes ensure that mechanical properties meet or exceed API Spec 7 requirements. A hardness range of 285-341, Brinell Hardness and Charpy  notch minimum impact strength of 40 ft-lb at 70OF are guaranteed one inch below the surface.
Connections NC23 NC26and NC31(2 3/8 IF and 2 7/8 IF) have a sufficient steel thickness for machining stress-relief grooves.
Drill collar material and process traceability are maintained from receipt of mill certified raw material to completion of all the manufacturing. Serial numbers are stamped on bar.
Rigid Inspection Procedures:
 We inspect all our drill collars to comply with API standards. These inspections include visual dimensional checks as well as ultrasonic inspections over the entire body of the drill collar.
Cold Rolling: 
Drill collar thread roots, as well as elevator recess upper radii, are cold-rolled. Cold rolling creates a compressive recess upper radii stress condition that increases fatigue life by minimizing crack initiation.
Phosphate-coated or copper plating: 
All connections are phosphate-coated or copper plating to improve resistance to galling.
Slip groove, elevator groove and size:
Our company offers optional slip and elevator recesses to improve handling efficiency and safety. The upper radius of the elevator recess is cold can be used together or separately. Unless otherwise specified, slip and elevator recesses are machined in compliance with API RP 7G guidelines.
Thread protectors:
Our company offers steel and cast steel and plastic steel thread protectors for its drill stem products. 

Standard size ,bores and connection for drill collar

Style of connection

OD

ID

Length
mm

Bevel diameter mm

Bending strength ratio

mm

in

mm

in

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)

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

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

 

Mechanical Property

TTT

Yield strength 0.2Mpa

Tensile strength b Mpa

Elongation 4%

Hardness(Brinell)

IMPACT VALUE(CHAPPY-V)

mm

in inch

79.4-171.4

3 1/8-6 3/4

≥758

≥965

≥13

285-341

≥54

177.8-279.4

7-11

≥689

≥930

 

STRESS-RELIEF SIZES FOR CONNECTION

Style of connection

Length of inner thread shoulder face to last thread scratch Lx
 1.59mm

Diameter of inner thread cylinder D

+0.40,-0mm

Taper of area behind inner thread cylinder20.83mm/m

Diameter of outer thread groove

DRG+0,-0.79mm

Length of alternative inner thread shoulder face to stress-relief groove LRG +0,-3.18mm

NC35

82.6

82.15

166.67

82.15

85.73

NC38(3 1/2IF)

88.9

88.11

166.67

89.30

92.08

NC44

101.6

101.60

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

250.00

134.14

117.48

NC61

127.0

132.95

250.00

149.25

130.18

NC70

139.7

152.00

250.00

171.05

142.88

6 5/8REG

114.3

134.14

166.67

137.72

117.48

7 5/8REG

120.7

133.35

250.00

162.72

123.83

8 5/8REG

123.8

149.25

250.00

184.94

127.00

 

 Order Instructions:

· Type (Slick or Spiral grooved)

· Outside and inside size and overall length

· Connection type and size

· API Stress relief Groove on pin and box ends

· Cast or pressed steel thread protectors

· Other special request, for example: slips or elevator recess and hardbanding style.

Non-MAGNETIC DRILL COLLARS

Materials of the Non-magnetic drill collars are made from chrome manganese, low C alloy obtained by combining a proprietary chemical analysis and a rotary hammer process. The material is resistant to stress corrosion cracking, with high machine ability and no tendency to galling.
Magnetic permeability (when MPS=1105/4Nm)
Relative max:1.010 average: U¦Ìr 1.005
Magnetic field gradient (hot spots)
Max: B 0.05micro tesla/100mm
The non-magnetic drill collars exhibit the mechanical properties indicated below along their entire length. The table is derived from test samples of steel taken from a point 1 below the surface. 

Mechanical Property

OD

Yield strength>0.2

Tensile strength>b

Elongation>。4(%)

mm

in

79.4--171.4

3 1/8--6 3/4

>758

>827

>18

177.8--279.4

7--11

>689

>758

>20

Non-magnetic Properties

· Relative Max: 1.010

· Average: ≤1.005

· Max. B ≤0.05 Micro Tesla/100 mm

Order Instructions

· Size of Non-magnetic Drill Collar

· Length

· Connection Type

· API Stress relief recess

· Other special request.

 

SPIRAL DRILL COLLAR 


Spiral grooves let mud circulate freely around the drill collar to equalize pressure and prevent a seal from forming. The spiral drill collar reduces the occurrence of differential pressure sticking. Spiral prevents differential sticking without spiral.

Spiral collars are wide used because of their maintenance features. The special grooves decrease the volume of the contact between the well side and the pipe, it leads to the decrease of the "tack" of the pipe and to turning of the drill pipe string.
 

The weight of round drill collars will be reduced approximately 4-6% by spiral conversion.

 

 

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QINGDAO OILRIG TRADE CO., LTD. has been dedicating itself to export business of oilfield equipment and components to North/South America, Europe, Middle East, South East Asia .

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OILRIG warrants our products for a period of one year to be free from defective material and workmanship. OILRIG's products equal or exceed the quality and tolerances of the products provided by the original manufacturer. 

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