Powered by Indico 

Stimulation of reservoir and induced microseismicity - Zurich, Switzerland, Workshop3
Stimulation of reservoir and induced microseismicity - Zurich, Switzerland, Workshop3
from 29 June 2006 to 01 July 2006 Kartause Ittingen, Switzerland
Stimulation of geothermal wells in basaltic rock in Iceland
Stimulation operations are commonly an integral part of the completion programs of 
geothermal wells drilled in the basaltic environment of Iceland, for high-enthalpy 
as well as low-enthalpy wells.  The purpose is to enhance the output of the wells 
either by improving near-well permeability that has been reduced by the drilling 
operation itself or to open up hydrological connections to permeable zones not 
intersected by the well in question.  The methods most often used involve applying 
massive and/or high-pressure water injection, often through open-hole packers, or 
intermittent cold water injection into high-temperature wells, aimed at causing 
cracking through thermal shocking.  The stimulation of wells through acidizing is in 
its infancy, however.  Stimulation operations are most commonly applied for a few 
hours to a few days while the drill rig is still on location.  In some instances 
stimulation operations have been conducted for several months.  The stimulation 
operations often result in well injectivity, or productivity, being improved by a 
factor of 2-3, while in some instances no improvement is observed.  Emphasis is 
placed on careful reservoir monitoring during stimulation operations but seismic 
monitoring is not commonly applied.  Yet, examples are available where long-term 
water injection has caused a marked change in seismic activity as well situations 
where long-term high-pressure injection has caused no microseismic activity at all.
Id: 5
Place: Kartause Ittingen, Switzerland
CH-8532 Warth TG
Starting date:
29-Jun-2006   14:20
Duration: 20'
Primary Authors: AXELSSON, Gudni (ISOR, Iceland GeoSurvey)
Co-Authors: THORHALLSSON, Sverrir (ISOR, Iceland GeoSurvey)
Presenters: AXELSSON, Gudni
Material: paper Paper
slides Slides

ENGINE | Powered by CERN Indico 0.94 | | Last modified 25 April 2008 16:33 | HELP