A unit of frequency measurement equal to one cycle per second. An expression which applies to a method developed for the purpose of logging highly deviated holes and holes with serious bridging problems. At the present time, systems such as this involve the use of drill pipe to carry specially designed well-logging tools through highly deviated boreholes or past wellbore constrictions to a depth where logging can be performed. A survey cable connects the downhole logging instrument to the surface where the measurements are recorded. Examples are Slant-hole Express and Toolpusher .
High explosives are unstable chemical compounds that are sensitive to shock.
High explosives detonate with a violent chemical reaction. Shaped charges and Primacords are high explosives. Compare low explosives . A dipmeter tool which records four high-resolution microresistivity curves and has an additional electrode on one pad which yields another curve at displaced depth. The displaced-depth curve is used to correct for variations on sonde speed.