Open Hole Logging

Definition - What does Open Hole Logging mean?

Open Hole Logging is a process of oil well logging that is performed before an oil borehole is cased or cemented. Logs meant for Open Hole Logging are usually run down the wellbore in the initial phase when the oil well has been drilled or is being drilled. This kind of logging helps in getting accurate measurements before getting obstructed by cement or casing. In simple words, Open Hole Logging is carried out in an exposed rock formation.

Petropedia explains Open Hole Logging

Well logging procedure is a technique of analyzing and collecting data of an oil well by using logging tools in the borehole. There are two types of well logging – Open Hole Logging and Cased-hole logging. Open Hole Logging is done when a borehole is penetrated by an open hole log before casing or cementing the wellbore while Cased-hole logging refers to the logging that is done after the wellbore has been cased. In Open Hole Logging, the rock formation inside the wellbore is bare and the measurements and other data can be taken accurately. Open Hole Logging is a common logging technique done either when an oil well is being drilled or after it has been drilled.

This definition was written in the context of Well Testing

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