Unlocking the Versatility of Drag Bits Across Various Drilling Applications
Drag Bits
Drag bits stand out as indispensable tools in an array of drilling endeavors, spanning environmental projects, exploration ventures, geothermal explorations, water well installations, road construction undertakings, and both natural gas and oilfield drilling operations.
These specialized drill bits shine brightest in softer, unconsolidated formations, encompassing clays, shale, sands, and soft limestone, perfectly suited to tackle a myriad of geological formations.
Two predominant styles dominate the drag bit landscape: the step type and chevron type bits, each engineered to cater to distinct drilling requirements and formations.
Step Drag Bits Excel in Overburdens and Soft Formations
Embark on overburden drilling ventures, navigate through sands, clays, and soft formations with the formidable step drag bit.
Renowned for its aggressive cutting structure, this variant generates larger cuttings and achieves higher Rates of Penetration (ROP). However, its durability is comparatively lower when compared to a chevron bit.
For optimal drilling performance, maintain rotary table speeds ranging from 60 to 80 rpm, coupled with a light Weight on Bit (WOB) strategy.
Leading manufacturers like Kay Rock Bit and Blue Streak offer an extensive array of step type bits across various sizes, ensuring tailored solutions for diverse drilling projects.
Chevron Drag Bit
Tackle abrasive formations such as soft sandstones and shales with the resilient chevron-type drag bit.
Boasting a robust cutting structure, this bit delivers enhanced durability while penetrating at a slower pace.
To maximize drilling efficiency, sustain rotary table speeds between 50 and 60 rpm, accompanied by light to medium WOB. Harder formations may necessitate higher WOB.
Blue Streak and Kay Rock Bit present premium chevron-style drag bits, meticulously crafted for water well and oilfield drilling applications. Each manufacturer offers unique features, so reach out to us to discuss your specific drilling requirements.
3 wing, 4 wing, or Step?
We’ve created the following table to help you decide which type of drag bit is needed for your application.
| 3 Wing | 4 Wing | Step | |
| Very hard rock/ coarse gravel | no | no | no |
| Pilot holes | yes | yes | yes |
| Highest ROP | yes | ||
| Sand, clay, soft formations | yes | ||
| Unconsolidated formations | yes | yes | yes |
| Hardest formation | yes | ||
| Medium formation | yes | ||
| Cuttings need to be logged | yes | yes | yes |
| Lowest ROP | yes | ||
| Greatest hole stability | yes | ||
| Least WOB | yes |
Simply put, 4 wing bits are the most durable BUT have the lowest ROP. When making a decision on which bit to buy, however, don’t purchase a 3 wing or step just to be able to drill faster. Always remember that damaged carbide cutters slow penetration rates.
Kelly Bits
Kelly bits emerge as go-to choices for table drive rigs, featuring common threads like 2 3/8 IF, Mayhew regular, Failing, or Mayhew Junior. Renowned for their elongated gauges, these bits adeptly condition the hole for seamless drilling operations.
