WorldWide Drilling Resource

41 WorldWide Drilling Resource ® FEBRUARY 2019 GROUNDWATER WEEK 2018 Dealmakers Send your deals to: michele@worldwidedrillingresource.com Troy and Jim with Eijkelkamp North America were pleased to show Gregg Drilling & Testing’s new rig with Mike and Kristen. Eijkelkamp North America Todd of Grassroots Drilling seals a deal with Jim of Eijkelkamp North America. Eric of Terra Testing in Washington, Pennsylvania, was happy to display the new rig from Eijkelkamp North America. PumpMan NorCal of Santa Rosa, California, sent Ron and Jason to show off their new video inspection van from Aries Industries of Waukesha, Wisconsin. Aries Industries A group from Holt Services of Milton, Washington, celebrate the purchase of a rig from Mobile Drill Intl of Indianapolis, Indiana. Mobile Drill Intl The Letts & Demery Pump and Drilling crew enjoyed the event while showing their new pump hoist with Albin of Pulstar Mfg/ PreferredPumpof Dodge, Nebraska. Pulstar Mfg/Preferred Pump Michael, Michael, and Edward with Central Valley Pump of Turlock, California, stand with Randy and Albin of Pulstar Mfg/Preferred Pump of Dodge, Nebraska. Frequently-Used Geological Terms Part 78 Glossary Adapted from the Dictionary of Geological Terms R Reaction Rim - A peripheral zone around a mineral, composed of another mineral species and represents the reaction of the earlier solidified mineral with the surrounding magma. Reaction Series - A series of minerals in which any early-formed mineral phase tends to react with the melt, later in the dif- ferentiation, to yield a new mineral further down in the series. For example, early-formed crystals of olivine react with later liquids to form pyroxene crystals, which may react with still later liquids to form amphiboles. This concept is often referred to as Bowen’s reaction series , after N.L. Bowen who first proposed it, or as the reaction principal. Realgar - A bright red to orange red monoclinic mineral. It occurs as nodules in ore veins and as a massive or granular deposit from some hot springs, and is frequently associated with orpiment. Recharge - The processes involved in the addition of water to the zone of saturation, also the amount of water added. Recovery - In mining, it refers to the percentage of valuable material derived from an ore, or of coal from a coal seam; also used as a measure of mining efficiency. In water wells, it indicates the rise in static water level in a well which occurs when discharge from that well or a nearby well, is stopped. In structural petrology, any process through which the number of grain dislocations (strain energy) produced during rock deformation can be reduced. Recovery Factor - A measure of the percentage of oil in place which can be recovered. It depends on porosity, per- meability, type of reservoir energy, and past experience under similar conditions. Recrystallization - The formation essentially in the solid state, of new crystalline mineral grains in a rock. It is the way in which a deformed crystal aggregate releases stored strain energy due to deformation. The new grains are generally larger than the original grains and may or may not have the same mineralogical composition. Red Beds - Sedimentary strata composed largely of sandstone, siltstone, and shale. They are predominantly red due to the presence of ferric oxide (hematite) coating individual grains. Examples include the Permian and Triassic sedimentary rocks of the western U.S. and the Old Red Sandstone facies of the European Devonian. Look for more terms next month! Realgar sample from Nevada. DIR