INTERFERENCE TEST ANALYSIS AT MENENGAI PHASE I GEOTHERMAL PROJECT, KENYA.

Interference tests are conducted to measure the pressure drawdown at an observation well, caused by the discharge of other wells tapping the reservoir. The main objective of the test is to determine the degree of reservoir continuity and de termine the inter well reservoir properties such as transmissivity (T) and storativity (S) within the field. This paper captures the analysis of interference test done in Menengai Phase I over a ten month period in 2016, involving four observation wells an d five production wells. The reservoir is assumed to be an isothermal, isotropic, homogeneous, porous medium of constant thickness and infinite areal extent. The production well is modeled based on a line source, which fully penetrates the reservoir. Press ure data from the observation well was analyzed with the line source solution by adapting principle of superposition for parameter values of T and S. Different scenarios were run to get the best estimates and yielded parameter values ranging from S= 1.76 x 10 7 to 1.76 x 10 8 m/Pa and T= 1.85 x 10 9 to 2.75 x 10 10 m 3 /Pa.