Zona invadida

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FIG. I-6. Invaded zone. (Courtesy Schlumberger.)

Porcion alrededor del agujero de pozo en el que el fluido de perforacion ha penetrado, desplazando los fluidos de la formacion. Invasion hasta de un metro de diametro ocurre in zonas porosas y permeables debido a que la presion del lodo de perforacion is mayor que la de los fluidos de formacion. Vease la Figura I-6.

Conforme el lodo de perforacion penetra la formacion, porciones de dicho lodo ("mudcake") se emplazan en la pared de dicha formacion, limitando el flujo del fluido de perforacion (filtracion) dentro de la formacion.

Directly behind the mud cake is a flushed zone from which almost all of the formation water and most of the hydrocarbons have been displaced by filtrate.

The invasion alters the distribution of resistivities and other properties and consequently the values that logs read. The depth of invasion is the equivalent depth in an idealized model rather than the maximum depth reached by filtrate.

In oil-bearing intervals, the filtrate may push a bank of formation water ahead of it to produce a relatively low-resistivity annulus, which is especially important with deep-investigation induction logs.


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