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TORQUE REDUCTION SUB

TECHNICAL SUMMARY

Torque reduction sub is to reduce the excessive torque generated by drilling in short radius horizontal section and large angle well section. According to its structural components, the torque reduction sub is divided into: mandrel body, upper and lower sliding bearings, slip spiral inner sleeve, straight rib outer sleeve, stop collar etc.
Torque reduction sub is mainly connected between short radius horizontal section and large angle well section, propose to connect a torque reduction sub by every 60ft, it can reduce 25%-35% torque after using this tool, it’s slip spiral inner sleeve, straight rib outer sleeve and body mandrel are relatively in non-rotating condition.

ADVANTAGES

1. An isolation point supported by the straight rib outer sleeve can be formed between the drill pipe and the casing, which can reduce the torque of the rotary table.
2. It can effectively prevent the direct contact between the drill pipe and the casing, reduce the wear of the drill pipe and the casing, and protect the casing.
3. Reduce the frictional contact force between the drill pipe and the casing, and reduce the resistance of the drill.
4. Greatly improve the service life of drill Pipe.

SPECIFICATION

To suit drill pipe size

(inch)

3 1/2

3 1/2

3 1/2

4

5

5

5

5

5 1/2

5 1/2

5 1/2

5 1/2

5 1/2

5 1/2

Conn. Type

VX38

NC38

HT38

XT39

HT50

NC50

TT550

VX50

FH

HT55

TT550

VX57

XT54

GPD5

Recommened make-up torque(fb·ls)

19,500

11,700

17,700

22,300

46,500

30,000

59,200

59,700

34,820

46,300

59,200

70,000

49,900

43,700

FEATURES

1. Reduce drill string wear and fatigue
2. Minimizes torque and drag
3. Minimizes casing wear
4. Increase ROP
5. Dampens vibration
6. Enhances drilling efficiency

TORQUE REDUCTION SUB

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