Q: Is the temperature gradient for measured or vertical depth? And what value should be used?

A: It is specified relative to vertical depth. Note that this refers to a flowing temperature gradient and not the geothermal gradient. The value for the flowing gradient will always be less than or equal to the geothermal gradient. Newer versions of PC-PUMP allow you the option of entering the flowing wellhead temperature instead of the gradient, if you prefer. In that case, it will display the calculated value for the gradient.

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