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Appendix D: Calculating the Differential Pressure at the Start of the Negative Test and the Quality of Foam Cement
Pages 166-169

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From page 166...
... 1. Pressure differential at the start of the negative test: 166
From page 167...
... density of the slurry from 16.74 ppg to 14.5 ppg. The bottom hole pressure is the hydrostatic pressure of 14 ppg mud or 13,321 pounds per square inch gauge (psig)
From page 168...
... Thus, the in situ foam quality is 17.4 percent. Note that the Chevron tests used a 13 percent quality foam, which corresponds to the weight fraction of nitrogen necessary to create a 14.5 ppg density foam at atmospheric conditions.
From page 169...
... 169 Appendix D Tz 13,335.7 Tz VN  0.174  1.925 p 1.71(705)


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