Gas Well Testing Handbook
Offering a thorough understanding of gas well test analysis basics, this book focuses on practical field application, where over 100 field examples are presented to illustrate basic methods for analysis.
TABLE OF CONTENTS Gas Well Testing Handbook
Appendix A: Use of SI Units in Gas Well Testing Equations
Example A 1 Converting Metric to English Gas Field Units
Equation A 1 describes the gradual decline in flowing bottom-hole pressure (atmospheres) in a gas or water well as related to time in seconds, when the rate of production is q (reservoir cc/sec). This liquid flow equation is useful generally even when gas is present. The following conversion factors and arithmetic will convert Eq. A 1 to A 2 from metric to English gas field units (however, leaving the t D parameter in Darcy units).
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1 foot = 30 .48 cm
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1 day = 86 ,400 sec
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1 B/D = 1 .84 cm 3/sec
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1mD = 0 .001 D
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1 psi = 1 /14 .65 atm
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in x = 2 .303 log x
Change q to (q ? o ), so that q = tank barrels
| Darcy units | English units | |
|---|---|---|
| h | cm | ft |
| r w | cm | ft |
| t | sec | day |
| q | cm 3/sec | bbl/day |
|
| cP | cP |
| k | D | mD |
| p | atm | psi |
| Field unit | Multiplication factor | Metric (SI) unit | Symbol |
|---|---|---|---|
| Acre | 4.046 856 E+03 | Square meter | m 2 |
| Acre | 4.046 856 E-01 | Hectare | ha |
| Acre-foot | 1.233 482 E+03 | Cubic meter | m |
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