Strictly: Drilling and oil-field services Message Board

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Gold/Mining/Energy : Strictly: Drilling and oil-field services

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To: Sidney Reilly who wrote (12237)	2/20/1998 11:44:00 PM
From: Douglas V. Fant	Read Replies (1) of 95453

Bob, Did anyone explain "fracc-ing" to you yet? Just in case no.... Well underground formations opposite of which the oil/gas well bore has been pierced usually flow naturally into the wellbore for recovery. Now the target reservoir's oil/gas flow potential is measured in two factors porosity and permeability (and actually the thickness of the source rock-but that is not relevant here). "Porosity" means how much oil/gas the little indentations in the source rock formation holds. "Permeability" refers to how well that trapped oil/gas may flow through the source rock formation and toward the wellbore for recovery. You need both porosity and permeability for a good well. Now companies that "frac" wells try to improve the permeability of the downhole formation usually in one of two ways: either flushing acids down the hole and into the formation in order to eat into the source rock and improve flow; or hydraulically-i.e. forcing water or a water /chemical/sand mix downhole and into the formation to fracture it through hydraulic pressure, witht he idea that oil/gas will flow toward the wellbore along these newly created cracks/channels in the source rock Fraccing may be done right after a well is drilled by the drill crew, or later in a well's life by a workover rig..... Sincerely, Doug F.

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