Impregnated Diamond Coreless Bits for Fishing

When drilling accidents occur—stuck pipe, dropped core barrels, or collapsed casing—the last thing you need is a bit that wears out before the fish is cleaned up. Our Impregnated Diamond Coreless Bits are specifically engineered for milling ferrous debris and full-hole drilling in tough conditions, offering a reliable solution for engineering recovery operations.

Unlike standard coring bits, these bits feature a modified matrix hardness and diamond concentration tailored for grinding metal junk and penetrating hard formations without core recovery . The matrix is designed to wear at a rate that continuously exposes sharp diamonds, ensuring efficient cutting through steel fragments, bit shanks, and stubborn downhole obstructions. This results in reduced fishing time and fewer trips, directly lowering your operational downtime.

Available in all standard wireline sizes— AQ, NQ, HQ, PQ, NTW, HTW —these bits integrate seamlessly with your existing drill string, allowing for rapid deployment when every hour counts.

Key Applications:

• Fishing & Milling: Grinding away dropped drill rods, core barrels, or subs.

• Coreless Drilling: Fast penetration through broken, hard, or unconsolidated formations.

• Wellbore Cleanup: Preparing the hole bottom for subsequent fishing tools.

Why Choose Our Bits:

• Optimized Matrix for Metal Cutting: Prevents bit polishing and ensures continuous cutting efficiency.

• Thermal Stability: Withstands the heat generated during dry or low-fluid milling operations.

• Full Size Range: AQ through PQ, plus NTW/HTW thin-wall series, available for immediate dispatch. We can also customize drill bits in various sizes.

FAQ:

Q: What is the best bit for milling a dropped core barrel?
A: Use an impregnated coreless bit with a soft-to-medium matrix and high diamond concentration. Our AQ/NQ milling bits are designed specifically for this.