Modelling Studies of Injection Capacity Decline Caused by Silica Deposition in Reinjection Wells in Tongonan, Philippines and Otake, Japan
- Location
- Leyte; Otake-Hatchobaru, Japan; Tongonan, Philippines
- Conference
- New Zealand Geothermal Workshop
- Year
- 1991
- Session
- Reservoir Engineering
- Language
- English
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Abstract
Mathematical models of silica deposition are derived using the method of characteristicsfor the problem of constant and variable rate injection into a well producing radially symmetric flow. Solutions are developed using the first order rate equationof silicaprecipitation suggestedby Rimstidt and Barnes (1980). The changes in porosity and permeability resulting from deposition are included in the models. The models developed are successfully applied in simulating the changes in injection capacityof some of the reinjection wells in Tongonangeothermalfield, Philippines and Otake, Japan.
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