WorldWide Drilling Resource

17 MARCH 2022 WorldWide Drilling Resource® Pitcher Sampler - A Unique Tool for Soil Sampling Adapted from Information by Acker Drill Company Obtaining accurate soil samples in formations too hard for shelby samplers or too brittle, soft, or water sensitive for conventional core barrel samplers can be challenging. The Pitcher Sampler was specifically designed to overcome those challenges. Several years of successful application in virtually every type of “problem” formation prove this sampler not only saves time and money, but also provides exceptional accuracy. The Pitcher Sampler features: j A heavy-duty, triple ball-bearing hanger sealed four ways against drilling fluid to prevent freeze-ups and ensuring long, trouble-free service. j A spring-seated tube which means no more crumpled shelby tubes. Plus, no presetting or surface control is needed. j A sliding valve to direct drilling fluid. j No reaming is necessary, so your borehole remains the same size. j Drilling fluid can’t undercut the shelby tube and erode or contaminate samples even in softest materials. j No core lifter is needed to protect or retain sample. j Sample all materials of a hole - including soft rock - from top to bottom. j Tubes can be changed quickly. j Drill can be stopped, rod rechucked (even raised slightly) without breaking the core. Here’s how it works. As the sampler enters the hole, a sliding valve directs drilling fluid through the shelby tube to the bottom of the hole for thorough preflushing action. As soon as the shelby tube touches bottom, it telescopes into the cutter barrel closing the sliding valve which automatically diverts fluid to the annular space between the shelby tube and cutter barrel. For the remainder of soft formation sampling, drilling fluid can’t touch the sample, yet high fluid velocity is maintained at the cutting bit to clean the hole, delivering rapid cutter penetration. In softer materials, the shelby tube leads the cutting bit by as much as six inches to eliminate the chance of contact between the drilling fluid and sample. The amount of lead is determined by the material hardness. As the formation increases in hardness, the shelby tube telescopes into the outer barrel and compresses a spring which, in turn, exerts greater force on the tube providing adequate lead. In harder formations, the cutter may lead the shelby tube by as much as ½ inch to core out the sample. A sample loaded shelby tube can be removed, an empty tube attached, and sampler started downhole again within 45 seconds. There’s no fumbling, no danger of losing the tube screw. Hex-headed screw turns “in” to release tube; turns “out” to lock tube securely in place. ENV

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