An EGS Stimulation Experiment Under Low Wellhead Pressures

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Conference Paper: An EGS Stimulation Experiment Under Low Wellhead Pressures


A stimulation experiment was conducted involving Coso injection well 34A-9 as part of the DOE-funded Coso/EGS project. When the well was first drilled, its measured temperatures were among the highest ever recorded within the Coso field, but its permeability was poor. Steam condensate was then injected into the well, resulting in significant and immediate injectivity improvements. 34A-9 was subsequently used for several years as a steam condensate injector, but was shut in due to leaks in the shallow casing. Upon repairing the liner, a second stimulation test was conducted in August 2004, again resulting in injectivity improvements. Significant microseismicity was measured in the vicinity of the well during the early stages of injection. Tracer testing was conducted during a subsequent circulation test, revealing excellent communication with a neighboring production well. The potential for mineral scaling in the reservoir adjacent to 34A-9 was simulated for injection fluids of various compositions. The maximum dissolution of silica and calcite was calculated based upon injection-fluid chemistry and injection flow rate into 34A-9 between

1999 and 2003.

Peter Rose, Jess McCulloch, Mike Adams and Mike Mella

Stanford Geothermal Conference; Stanford, California; 2005/01/31

Stanford University, 2005

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Internet link for An EGS Stimulation Experiment Under Low Wellhead Pressures

Peter Rose,Jess McCulloch,Mike Adams,Mike Mella. 2005. An EGS Stimulation Experiment Under Low Wellhead Pressures. In: Thirtieth Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California. Stanford Geothermal Conference; 2005/01/31; Stanford, California. Stanford, California: Stanford University; p. 6