Reverse Cleanout in a Geothermal Well: Analysis of a Failed Coiled-Tubing Operation
- Thomas Reinsch (GFZ German Research Centre for Geosciences) | Simona Regenspurg (GFZ German Research Centre for Geosciences) | Elvira Feldbusch (GFZ German Research Centre for Geosciences) | Ali Saadat (GFZ German Research Centre for Geosciences) | Ernst Huenges (GFZ German Research Centre for Geosciences) | Kemal Erbas (GFZ German Research Centre for Geosciences) | Guenter Zimmermann (GFZ German Research Centre for Geosciences) | Jan Henninges (GFZ German Research Centre for Geosciences)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- November 2015
- Document Type
- Journal Paper
- 312 - 320
- 2015.Society of Petroleum Engineers
- geothermal, coiled tubing, coating, reverse cleanout
- 7 in the last 30 days
- 427 since 2007
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During the production of geothermal brine from a production well in Groß Schönebeck, Germany, an obstruction was observed when logging the reservoir interval of the well. Several bailer runs were performed to identify the cause, and it was discovered that mainly loose precipitates and fragments of coating from the production tubing were obstructing the well. To remove the fill from of the well, a reverse-cleanout operation with coiled tubing was performed. Because of wellbore restrictions, particle size, and the rheology of the fill, only a small portion of the obstruction could be removed. This paper describes the coiled-tubing operation and the application of a simple hydraulic model to explain possible reasons for failing to effectively clean out the well.
|File Size||665 KB||Number of Pages||9|
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