Varel Oil and Gas releases new directional PDC drill bits


CARROLLTON -- Varel Oil and Gas is staking it’s claim on the curve bit market by utilizing decades of bit design experience with accurate, predictive simulation software to target what directional companies and operators need most: consistent, controllable bits in the curve. Varel focused on designing bits with consistent yield, by managing tool face geometry and optimizing side cutting tendency. In addition, we are collaborating with directional companies to devise unique BHA and operational solutions that benefit the entire team of service companies and operators.


Tool face geometry is managed by cutter back rake schemes and the placement of cutting structure elements that create a combination of a passive tool face during kick-off and increased ROP along the curve as the trajectory is set. The correlation of the simulation software results with actual dulls, aids in this arrangement, allowing bit designers to predict blade, cutter, and tungsten carbide shock stud contact with the formation in different inclinations and ROPs.

An example of collaborating directly with directional companies provided a solution with low depth of cut and the use of higher RPM motors. Smaller cutters and shock studs reduce torque for tool face control and better distribute cutting forces along the active profile. This resulted in consistent yields while maintaining desired ROP through the curve. The combination of design parameters and teamwork with directional companies has allowed for curves being drilled with 60% rotating time and 40% higher yields than planned, outperforming roller cone, PDC/hybrid, and other directional PDC designs across North America.

Varel is proud to introduce MARKSMAN Directional PDC Drill Bits; a product derived with a new direction in the curve, where true value comes from customer success.

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