دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: fishing equipment used to recover wireline tools stuck in the hole when the wireline or cable is intact. It consists of a cable hanger, spear point rope socket, spearhead overshot, conventional overshots, drill pipe, and elevators.

n: 1. an injection of water prior to chemical flooding that is used to induce reservoir conditions favorable to the surfactant solution by adjusting reservoir salinity and reducing ion concentrations. A preflush may also be used to obtain advance information on reservoir flow patterns. 2. fluid injected prior to the acid solution pumped into a well in an acid-stimulation treatment;sometimes called a spearhead. Compare overflush.

n: a rope socket with a point on it that mates with a spearhead overshot.

n: see prejlush.

n: A section of special liquid be bumped-in before bumping-in spacer fluid
when cementing ,which used to clear out cake of borehole wall .

n: the small wirelineoperated overshot designed to latch onto a spear point rope socket so that the wireline below the socket can be retrieved.