what is gas liberation give some examples in equitions...
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Sufficient evidence exists to suggest that misinterpretation of wellsite gas detection data is quite common. The question is often asked, "How big a gas show should I expect to get from a zone that will make a well?" Such misunderstanding may often be traced to a lack of familiarity with the fundamental principles of gas detection and interpretation.
To illustrate these fundamental principles, a drilling model is presented to demonstrate the effects of bit penetration. The model is analyzed to explain theoretical gas detection response to the penetration of a hydrocarbon bearing zone. Gas show characteristics, as transmitted to the surface by the drilling fluid, are specifically related to bit penetration. A careful analysis for the drilling model derives four
classifications of gas present in the drilling fluid. These are:
Liberated gasProduced gasRecycled gasContamination gas
A strong case is presented to show that all drilling fluid hydrocarbons may be classified into one of the four categories.
Definitions are provided for each type of gas.
Liberated gas is defined as gas mechanically liberated by the bit into the drilling fluid as the bit penetrates the formation.Produced gas is defined as gas produced into the drilling fluid from a specific zone in response to a formation pressure which exceeds the opposing effective hydrostatic pressure.Recycled gas is defined as gas which has been pumped back down the hole to appear a second time at the surface.Contamination gas is defined as gas artificially introduced to the drilling fluid system from a source other than the rock formations.
To illustrate these fundamental principles, a drilling model is presented to demonstrate the effects of bit penetration. The model is analyzed to explain theoretical gas detection response to the penetration of a hydrocarbon bearing zone. Gas show characteristics, as transmitted to the surface by the drilling fluid, are specifically related to bit penetration. A careful analysis for the drilling model derives four
classifications of gas present in the drilling fluid. These are:
Liberated gasProduced gasRecycled gasContamination gas
A strong case is presented to show that all drilling fluid hydrocarbons may be classified into one of the four categories.
Definitions are provided for each type of gas.
Liberated gas is defined as gas mechanically liberated by the bit into the drilling fluid as the bit penetrates the formation.Produced gas is defined as gas produced into the drilling fluid from a specific zone in response to a formation pressure which exceeds the opposing effective hydrostatic pressure.Recycled gas is defined as gas which has been pumped back down the hole to appear a second time at the surface.Contamination gas is defined as gas artificially introduced to the drilling fluid system from a source other than the rock formations.
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