【国外硕士】Inferring Immobile and In-Situ Water Saturation from Laboratory and

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Title:Inferring Immobile and In-Situ Water Saturation from Laboratory and Field Measurements

Author:Rodolfo P. Belen Jr.

Year:2000

Degree:MS

Abstract:

Analysis of experimental data and numerical simulation results of dynamic boiling experiments revealed that there is an apparent correlation between the immobile water saturation and the shape of the steam saturation profile. An elbow in the steam saturation profile indicates the sudden drop in steam saturation that marks the transition from steam to two-phase conditions inside the core during boiling. The immobile water saturation can be inferred from this elbow in the steam saturation profile. Based on experimental results obtained by Satik (1997), the inferred immobile water saturation of Berea sandstone was found to be about 0.25, which is consistent with results of relative permeability experiments reported by Mahiya (1999). However, this technique may not be useful in inferring the immobile water saturation of less permeable geothermal rocks because the elbow in the steam saturation profile is less prominent.

Models of vapor and liquid-dominated geothermal reservoirs that were developed based on Darcyís law and material and energy conservation equations proved to be useful in inferring the in-situ and immobile water saturations from field measurements of cumulative mass production, discharge enthalpy, and downhole temperature. Knowing rock and fluid properties, and the difference between the stable initial, To, and dry-out, Td, downhole temperatures, the in-situ and immobile water saturations of vapor-dominated reservoirs can be estimated. On the other hand, the in-situ and immobile water saturations, and the change in mobile water content of liquid-dominated reservoirs can be inferred from the cumulative mass production, Dm, and enthalpy, hí, data. Comparison with two-phase, radial flow, numerical simulation results confirmed the validity and usefulness of these models.

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