دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A kind of device. When downhole instrument is lifted through wellbore, the wall is scaned by impulsive sonar with dense spiral. The picture of wall can be produced by converting echo of TV screen. The picture can disclose split and cavern.

a sonic caliper, developed in the late 1960’s, which generated a sonar picture of the wellbore.

n: a natural cavity in the earths crust that is large enough to permit human entry. Commonly formed in limestone by groundwater leaching. Compare vug.

n: a rock formation that contains large open spaces, usually resulting from the dissolving of soluble substances by formation waters that may still be present. See vug.

n: A formation having columinous voids, usually the result of dissolving by formation waters which may or may not be still present.

n: A kind of gyulekhite. Usually coming from olivine alteration in cavernous basalt.

n: The arching, acclive and cavernous surface of whipstock.

n: a stratum of rock that contains large void spaces, i.e., a cavernous or vuggy formation.

n: a rock contains large holes.

n: the loss of quantities of whole mud to a formation owing to caverns,fractures or highly permeable beds,also referred to as lost returns.

n: the quantities of whole mud lost to a formation, usually in cavernous, fissured, or coarsely permeable beds. Evidenced by the complete or partial failure of the mud to return to the surface as it is being circulated in the hole. Lost circulation can lead to a blowout and, in general, can reduce the efficiency of the drilling operation. Also called lost returns. low vapour pressure liquid

n: the loss of quantities of whole mud to a formation owing to caverns,fractures or highly permeable beds,also referred to as lost returns.

during circulation, when less fluid returns to the surface than was injected into the well. Severe lost circulation is the loss of all returns.

n pi: see lost circulation.

n: the loss of quantities of whole mud to a formation owing to caverns,fractures or highly permeable beds,also referred to as lost returns.

loss of returning fluid during circulation of a well.