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Geofluids
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2017
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Article
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Tab 1
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Research Article
Research on Rapid Identification and Evaluation Technology for Gas Formation during Underbalanced Drilling
Table 1
Evaluation criteria for gas zone.
Effective porosity (%)
Density decrease (%)
Temperature decrease (%)
Result
>8
>15
>10
Gas zone
5–8
8–15
5–10
Poor gas zone
<5
3–8
3–5
Gas-water zone