The success of pressure transient analysis often depends on the accurate measurement or estimation of the bottom hole pressure. Measurements can be accomplished by a descending probe. Estimation may be realized via a calculation method.

Although a pressure survey may be a more desireable mode, it is nevertheless time consuming and costly. In the case of a geothermal well, two additional shortcomings are obvious high temperature and frequent presence of highly corrosive noncondensable gases. The latter may render expensive pressure ìbombsì obsolete.

A calculation method for predicting bottom hole pressures bases on easily obtainable well head parameters is therefore not only desirable, but necessary. Several correlations are presently available, This paper presents four calculation procedures for the estimation of bottom hole pressures. analysis, while the remaining two are for flowing wells.

In both cases, the first procedure is the established, classic technique followed by a novel correlation, tailored to suit wells that operate at either saturated or slightly superheated conditions. These correlations are particularly applicable to the reservoirs in The Geysers area, where the properties of the geothermal fluid closely match the assumptions in this paper.

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