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...is preferable. However, if the technique does not yield such an advantage, overbalance perforation becomes the most viable method. ...operated on wireline, if assembly weight allows it. When operators choose overbalance perforation, they should also select the correct high shot density gun for

...the hydrostatic mud column pressure is indicated by an “o.” The degree of overbalance (that is, the difference between the mud and formation pressures) is clearl

...flushing ahead of the coring bit may take place. Thus, one should minimize overbalance, use a low fluid loss drilling fluid, and when possible, employ the new low

...lifts the drilled rock cuttings up the hole. It should be dense enough to overbalance any high-pressure formations encountered while drilling. If it fails in thi

...bined with knowledge of drilling fluid properties (fluid loss or amount of overbalance), may indicate that the calculated permeability is indicative of only the d