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→Methods for determining fluid contacts
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| Pressure profiles: [[Repeat formation tester|RFT]] tests
| Pressure profiles: [[Repeat formation tester|RFT]] tests
| Estimates free-water surface from inflections in pressure versus depth curve
| Estimates [[free-water surface]] from inflections in pressure versus depth curve
| Little affected by lithology or coning
| Little affected by lithology or [[Production problems#Water-gas coning|coning]]
| Imprecise; data usually require correction
| Imprecise; data usually require correction
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| Only useful for thick HC columns
| Only useful for thick hydrocarbon columns
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