21 JANUARY 2024 WorldWide Drilling Resource® Why Use PDC Bits? Adapted from Information by Infinity Tool Mfg. PDC bits, also known as polycrystalline diamond compact bits, have been used with great success in the oil field. Recently, drill operators in the construction, geothermal, mining, water well, and horizontal directional drilling industries, have discovered the many benefits of operating with PDC bits and reamers. The main reason drill operators run with PDC bits is for the increased production. When run properly, a PDC bit can increase penetration rates 50-250%. This translates into faster project completion, fuel savings, and reduced labor cost per hole. Another benefit of running PDC is how little stress they place on drill rigs. They do not require the enormous amount of weight on bit (WOB) roller cones require. As a general rule of thumb, PDC bits and reamers require less than half of the push/pull a roller cone would. Less torque means less stress and vibration on the drilling rods. PDC products also have no moving parts and clean holes with a more consistent cutting size. In fact, some PDC bits are made from a one-piece steel body for strength and durability. Here are some general operating guidelines for PDC bits: Bit Preparation - Care needs to be taken with the diamond cutting elements. Always place the bit on softer surfaces; for example, wood, rubber mat, or plastic. Installation of Nozzles - Nozzle holes should be inspected and free of debris before installation. Install the seal into the bottom of the nozzle port while making sure they remain flat on the sealing surface. Don’t forget to apply thread lock to all the threads of nozzles and tighten them with a nozzle wrench. Make-up Torque - Visually inspect thread pin for any debris. Apply antiseize thread compound. Upon reentry of an existing hole, one should see an increase on torque as well as WOB which will indicate either contact with bottom of hole, or preexisting cuttings. PDC bits usually show an increase of torque before WOB appears. Always avoid high WOB when in old cuttings as this will cause bit balling. As soon as previous cuttings have been reached, continue to rotate to the bottom of hole at full circulation until you are certain the drill has reached the true bottom of the hole. The WOB should not exceed 1000 pounds per inch of bit at a rotational rate of 60-80 RPM. Reaming - Tripping in the Hole - Trip slowly. If major hole issues are present, running a separate cleanup to help straighten the hole may be necessary. Please remember, while tripping the hole, PDC bits are susceptible to damage - especially cutter damage. Bits with smaller junk slots (the groove between cutter blades) may produce surge pressures due to the restrictive space. Pumping drilling fluid downhole can help with hang ups and help flush the junk slots clean, making it easier to retract the bit. Recommendation is to ream 80-90 feet at reaming speed with full circulation. Infinity’s rock drilling tooling is manufactured in its state-of-the-art facility in Benton, Illinois, using the highest quality materials and international quality standards. G&O Phone: 845-278-1892 E-mail: NEWWEXPO@gmail.com newwassociation.org Contact: ____________________________________________________________ Address: ____________________________________________________________ State/Zip Code: ______________________________________________________ Phone & Fax : _______________________________________________________ E-mail: ______________________________________________________________ *Preregistration - $25 per person On-site Registration - $30 Spouse & Children under 16 years - FREE Registrant(s) Names: ________________________________________________ ____________________________________________________________ ____________________________________________________________ Credit Card Type ________________________ Expiration Date _ _ / _ _ Credit Card # ____________________________________________________________ Complete this form and fax to: (845) 278-1899 or mail to: NEWWA c/o Markets Beyond Inc. 7 Bailey Lane, Brewster NY 10509 Preregistration NEWWA New England Water Well Assoc. Expo March 8-9, 2024 Best Western - Marlborough, Massachusetts *Preregistration Deadline: March 1, 2024
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