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| ©2000 AGI |
Pressure History Exercise
The Lisa No. 1 well was completed at 7,800 ft with an initial pressure of 3,435 psi. The production and pressure depletion over the next several years is shown in the table below. Using this information, input the pressure values shown in the table below into spreadsheet5-2.xls (gas gravity), to generate the gas-compressibility coefficient for each pressure and to complete the table below.
Once you have completed these steps, a material-balance plot will be automatically generated on the basis of your answers. Study this plot to answer the following questions. For additional help, select "Ask the Expert".
- Does the gas-compressibility factor change linearly as pressure decreases?
- What is the estimated original gas in place (OGIP) from this material-balance plot?
- From analyzing the pressure and production history, what reservoir characteristics can be inferred?
