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Subsitute

Substitute

    Substitute is a specialized joint connecting drill string and washover pipe in the washover operation. Profiled joint are divided into plain profiled joint and profiled safety joint .

 

Specification of Plain Profiled Joint

Type

O.D.of

Upper end(mm)

Upper end thread

Lower end two-stage

thread

Type

O.D.of

Upper end(mm)

Upper end thread

Lower end two-stage thread

YJT146

127

NC38

5 3/4ζ̳ݿFJWP

YJT219

178

NC50

8 5/8ζ̳ݿFJWP

YJT194

165

NC50

7 5/8ζ̳ݿFJWP

YJT244

203

6 5/8REG

9 5/8ζ̳ݿFJWP

YJT206

165

NC50

8 1/8ζ̳ݿFJWP

YJT273

203

6 5/8REG

10 3/4ζ̳ݿFJWP

Specification of Profiled Safety Joint

Type

O.D.of

Upper end(mm)

Upper end thread

Lower end two-stage thread

Type

O.D.of

Upper end(mm)

Upper end thread

Lower end two-stage thread

YJT146

127

NC38

5 3/4ζ̳ݿFJWP

YJT219

178

NC50

8 5/8ζ̳ݿFJWP

YJT194

165

NC50

7 5/8ζ̳ݿFJWP

YJT244

203

6 5/8REG

9 5/8ζ̳ݿFJWP

YJT206

165

NC50

8 1/8ζ̳ݿFJWP

YJT273

203

6 5/8REG

10 3/4ζ̳ݿFJWP