Specifications

1. OD:3 1/8'' ~ 11''
2.ID: 1 1/4'' ~ 3''
3. NC23-31 ~ 8 5/8REG
4.Length: 9150 or 9450mm
5.API 7; AISI4145H, SY/T5144

                                                       Drill collar

 

we supply different drill collars and other petroleum equipments,  for more details please kindly contact us.

 

Options:

   *Standard:API 7; AISI4145H, SY/T5144 or Non-Standard.

 

1.Standard size, bores and connections for drill collar.

       Connection: NC23-31 ~ 8 5/8REG

       OD: 3 1/8'' ~ 11'' (79.4 ~ 279.4mm)

        ID: 1 1/4'' ~ 3'' (31.8 ~ 76.2mm)

        Length: 9150 or 9450mm

        Df: 76.2 ~ 266.7mm

        Bending strength ratio: 2.75:1 ~ 2.84:1

2.Spiral size of spiral drill collar.

        OD:3 7/8'' ~ 11'' (98.4 ~ 279.4mm)

        Depth of cut(A) mm: 4.0+/-0.79 ~ 11.9+/-2.37

        Depth of cut(B) mm: 5.6+/-0.79 ~  8.7+/-1.59

        Pitch: 914 ~2037mm

3.Non-maganetic drill collar.

        Sel.:NC23-31 ~ 8 5/8REG

        OD:3 1/8'' ~ 11'' (79.4 ~ 279.4mm)

         ID: 1 1/4'' ~ 3'' (31.8 ~ 76.2 mm)

         Length: 9150 or 9450

         Bending strength ratio: 2.75:1 ~ 2.84:1