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Gneiss / Schist / Slate Geiger Mueller Counter / Scintillation Detector Metal-to-metal Seal / Ring Gasket / Seal Seal Swelling / Gas Permeation Seismograph / Geophone Shake-out Test / BS&W Test Chalk / Shale Shooting Nipple / Bell Nipple / Lubricator Long String / Short String Shut-in Casing Pressure / Shut-in Tubing Pressure Sill / Dike Sink Hole / Karst Slick Joint / Slip Joint / Safety Joint (Shear joint) Fingering / Slippage Erosion Corrosion / Fretting Corrosion Smectite / Kaolinite / Illite Bow Spring Centralizer / Hydraulic Centralizer / Rigid Centralizer / Screen Centralizer / Solid Body Centralizer Stick Plot / Tadpole Plot