Drill pipes ltd.
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Special-Purpose Tubing

Integral-joint tubing

Integral-joint tubing is used

  • as drill pipes for running and cementing of liners;
  • for installation of cement plugs and drilling in unstable formations.

Integral-joint tubing are made with externally and internally upset tips for threading and can be easily drilled out by the rock drilling bit.

NON-magnetic drill collars

Non-magnetic integral-joint drill collars are used:

  • as non-magnetic housings and pipes for downhole telemetric system
  • for geophysical surveys inside the drill column with regards to non-magnetic properties of the alloys.

heavy light-alloy tubing WITH INTERNAL END PROTECTOR  

Heavy light-alloy tubing with internal end protector is used:

  • as intermediary element of BHA to vary the rigidity from frill collars to heavy light-alloy tubing with internal end protector;
  • as the damper of longitudinal vibrations with regards to aluminum alloy capacity to absorb and disseminate the elastic vibration energy.

TECHNICAL CHARACTERISTICS OF SPECIAL-PURPOSE TUBING

Parameters

Integral-Joint TubingHeavy Light-Alloy Tubing
without tool-jointwith tool-joint
 Integral-Joint Tubing 146х11Drill Collars 104х25Drill Collars 120х28Drill Collars 172х45Drill Collars 203х56heavy light-alloy tubing with internal end protector 103х16heavy light-alloy tubing with internal end protector 147х25

Pipe length, mm

9600 9000 9000 9000 6000 9300 9300

Pipe body dimensions, mm:

• outside diameter

• wall thickness

• inside diameter

 

146

11

124

 

104

25

54

 

120

28

64

 

172

45

82

 

203

56

90

 

103

16

71

 

147

25

97

Type of thread

З-147 (5 ½ FH) З-86 (NC-31) З-102 (NC-38) З-133 (NC-50) З-152 (6 5/8 Reg) З-102 (NC-38) З-147 5 ½ FH

Pipe weight in air, kg

158 155 200 445 435 135 292
Strength parameters – alloy D16Т/1953Т1

Tensile load, kN

• allowed tensile load (0.8 σт)

• limited tensile load

 

1222 / 1804

1516 / 2240

 

610

760

 

890

1110

 

1750

2185

 

2430

3040

 

1136/1680

1420/2100

 

2310/3410

2885/4260

Thread connection life (number of make-ups and break-outs)

  120-140 120-140 100-120 80-100 400-500 300-400

 

notes

  • The above parameters are given for reference.
  • The parameters are calculated on the basis of the minimal yield strength of the aluminum alloy for the main section of the pipe body.
  • Upon customer request, the pipes can be manufactured with other typical sizes and modified geometrical parameters and threads.

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