Junk Subs

Junk Subs capture and trap junk too heavy to circulate. They are designed to be used in the drill collar string just above the rock bit or milling tool. The tool consists of a steel mandrel with an oversized sleeve or "skirt" attached over the mandrel. The "skirt" is welded at the lower end. The "skirt" will trap the large cuttings and junk which are too heavy to be circulated out of the hole. The "skirt" is manufactured with bleed holes to allow the mud to drain once it is brought out of the hole. It is recommended that two junk subs be run in tandem to decrease the possibility of junk bypassing a single junk sub.

Specifications
(dimensions shown in inches)

 

Dressed Dia.

Top and Bottom Connections

Overall Length

Fishing Neck Dia.

Body Dia.Under Sleeve

Bore Dia.

Sleeve Length

Approx Weight
(Ibs.)

3-5/8

2-3/8

33

3-1/16

2

1

12

50

4

2-3/8

33

3-1/2

2-1/2

1-1/4

12

62

4
4-14-1/2/4
955

2-7/8
2-7/8

37
37

3-5/8
3-7/8

2-1/2
2-1/2

1-1/4
1-1/4

12

66

4-1/2

2-7/8

37

3-7/8

2-1/2

1-1/4

12

91

5

3-1/2

38

4-3/8

3-1/4

1-1/2

12

120

5-1/2

3-1/2

38

4-5/8

3-1/4

1-1/2

15

144

6-1/2

4-1/2

48

5-7/8

4-1/2

2

15

261

6-5/8

4-1/2

48

5-7/8

4-1/2

2

15

270

6-3/4

4-1/2

48

5-7/8

4-1/2

2

15

280

7

4-1/2

48

6

4-1/2

2

15

298

8-1/2

6-5/8

50

7-1/2

5-3/4

2-13/16

15

438

8-5/8

6-5/8

50

7-1/2

5-3/4

2-13/16

15

451

9-5/8

6-5/8

50

8-1/2

5-3/4

2-13/16

15

529

10-3/4

7-5/8

51

9-5/8

7-5/8

3

15

806

12-3/4

7-5/8

51

11

7-5/8

3

15

1065

Note:

  1. All dimensions given are in inched unless otherwise stated.
  2. All weights are approximate.
  3. Standard API regular connections. Other sizes, lengths & connections are available on customer request.

Ordering Information:

Please include the following information when ordering junk subs:

  1. Tool size.
   2.Top and Bottom Connections.