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Injection Improvements in Low Permeability and Negative Skin Wells, using Mechanical Cleanout and Chemical Stimulation,

IntroductionInjection well historiesTR10TR7TR1BAcid Job ProgramsWell Test AnalysisTotal injection projectConclusions. Location of Geothermal Projects. Berlin Geothermal field: 56 MWe, started June-199910 Production wells: -900 to -1000 masl, Average: 8.2 MWe18 Injection wells: -1200 to -1500 masl, Ranging 7-120 kg/sNo injection pumps to force water into injection wellsHot and cold injection lines: Low and high Injection pressures: 15,23 bargSome cases individual injection wells: a1139

JasminFlorian
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Injection Improvements in Low Permeability and Negative Skin Wells, using Mechanical Cleanout and Chemical Stimulation,

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    1. Injection Improvements in Low Permeability and Negative Skin Wells, using Mechanical Cleanout and Chemical Stimulation, Berlin Geothermal Field, El Salvador GRC, 2007 Sparks, Nevada

    2. Introduction Injection well histories TR10 TR7 TR1B Acid Job Programs Well Test Analysis Total injection project Conclusions

    4. Berlin Geothermal field: 56 MWe, started June-1999 10 Production wells: -900 to -1000 masl, Average: 8.2 MWe 18 Injection wells: -1200 to -1500 masl, Ranging 7-120 kg/s No injection pumps to force water into injection wells Hot and cold injection lines: Low and high Injection pressures: 15,23 barg Some cases individual injection wells: alternatively hot and cold injectate, according to the need. Challenge: Increase generation from 49 to 56 MW Introduction

    5. Injection wells intrinsically low permeability therefore permeability later created by hydrofracturing Few fractures encountered Fractures sealed with minerals Presence of dykes filling in the fractures Low permeability by solid particles transported from the production wells and silica fragments from the gathering system. From year 2000-2006, 80% of wells with positive skin, have been cleaned. TR10, TR7 and TR1B �skin wells:cleaned Introduction

    18. TOTAL INJECTION PROJECT Pumping Station in pad TR1�s: Consists in a high pressure pumping station and it has three multistage horizontally axis pumps of 1300 HP each, Its nominal capacity is 220 kg/s and 75 bars. Pumps are controlled by variable frequency drivers located at the same pad. By the end of 2007, all the injection pads will be equipped with filters to keep silica particles from entering the injection wells.

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