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Address: No55. Jiucaiyuan road, Furong District, Changsha, Hunan,China
Contact name:Ling Bo
Changsha Sollroc Engineering Equipments Co., Ltd |
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89mm stepped 3 wings Drag Drill Bit 3 1/2 inch for drill pipe 76mm
drag bit is a drill bit usually designed for use in soft formations
such as sand, clay, or some soft rock. However, they will not work
well in coarse gravel or hard rock formations. Uses include
drilling water wells, mining, geothermal, environmental and
exploration drilling. Whenever possible, they should be used to
drill pilot holes because they produce cuttings that are easiest to
log.
Step type bits are the most common type of drag bit used in the
world today. They are primarily designed for soft to medium
formations.
Chevron bits are designed for medium to hard formations and are
used in areas that contain a lot of rock and also in the oilfield
for drilling out concrete casings and plugs.
Three wings stepped drag bits diameter:
| Diameter | Connection thread |
| 3 7/8" - 4 3/4" | 2 3/8" API Pin |
4 7/8" - 5 1/8" | 2 3/8" API Pin |
5 1/4" - 5 1/2" | 2 3/8" API Pin |
4 5/8" - 5" | 2 7/8" API Pin |
5 1/8" - 5 1/2" | 2 7/8" API Pin |
5 5/8" - 6 1/4" | 3 1/2" API Pin |
6 1/2" - 6 3/4" | 3 1/2" API Pin |
7" - 7 1/2" | 3 1/2" API Pin |
7 5/8" - 8" | 3 1/2" API Pin |
