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Line 84:
Line 84: + + + + + − − [[file:pressure-transient-testing_fig6.png|thumb|{{figure number|6}}Fetkovich's type curve for analyzing long-term production data. (After <ref name=pt09r8>Fetkovich, M. J., 1980, Decline curve analysis using type curves: Journal of Petroleum Technology, June, p. 1065–1077.</ref>.)]] Line 94:
Line 97: − − [[file:pressure-transient-testing_fig7.png|left|thumb|{{figure number|7}}Actual production data matched on a Fetkovich type curve.]] − − [[file:pressure-transient-testing_fig8.png|thumb|{{figure number|8}}History match of production data and forecast of future performance.]]
→Long-term production tests
==Long-term production tests==
==Long-term production tests==
<gallery mode = packed>
file:pressure-transient-testing_fig6.png|thumb|{{figure number|6}}Fetkovich's type curve for analyzing long-term production data. After Fetkovich.<ref name=pt09r8>Fetkovich, M. J., 1980, Decline curve analysis using type curves: Journal of Petroleum Technology, June, p. 1065–1077.</ref>
file:pressure-transient-testing_fig7.png|left|thumb|{{figure number|7}}Actual production data matched on a Fetkovich type curve.
file:pressure-transient-testing_fig8.png|thumb|{{figure number|8}}History match of production data and forecast of future performance.
</gallery>
The same information is available from long-term production tests as from short-term flow tests, including permeability, skin factor, and distance to boundaries. Hydrocarbons in place in the tested well's drainage area can frequently be estimated from these test data. Once boundaries have affected the test data, long-term production data can be extrapolated to provide a forecast of future production to the economic limit and can thus provide a reserve estimate for the well.
The same information is available from long-term production tests as from short-term flow tests, including permeability, skin factor, and distance to boundaries. Hydrocarbons in place in the tested well's drainage area can frequently be estimated from these test data. Once boundaries have affected the test data, long-term production data can be extrapolated to provide a forecast of future production to the economic limit and can thus provide a reserve estimate for the well.
===How the tests are run===
===How the tests are run===
These “tests” are applicable at any time. The data are most readily analyzable if the well is produced at approximately constant BHP or when BHP and flow rate are known continuously as functions of time.
These “tests” are applicable at any time. The data are most readily analyzable if the well is produced at approximately constant BHP or when BHP and flow rate are known continuously as functions of time.
===How the tests are analyzed===
===How the tests are analyzed===
The simplest of these tests—those with production data from wells produced at constant BHP or with smoothly changing rates and BHP—can be analyzed with simple type curves, such as Fetkovich's, illustrated in [[:file:pressure-transient-testing_fig6.png|Figure 6]]. Formation properties are obtained from matches of actual field data to the type curve. Forecasts are made by projecting future performance along the type curve that matches post-production performance.
The simplest of these tests—those with production data from wells produced at constant BHP or with smoothly changing rates and BHP—can be analyzed with simple type curves, such as Fetkovich's, illustrated in [[:file:pressure-transient-testing_fig6.png|Figure 6]]. Formation properties are obtained from matches of actual field data to the type curve. Forecasts are made by projecting future performance along the type curve that matches post-production performance.