Balanced Reverse-Cleanout Operation: Removing Large and Heavy Particles From a Geothermal Well
- Thomas Reinsch (GFZ German Research Centre for Geosciences) | Stefan Kranz (GFZ German Research Centre for Geosciences) | Ali Saadat (GFZ German Research Centre for Geosciences) | Ernst Huenges (GFZ German Research Centre for Geosciences) | Manfred Rinke (Geothermie Consulting-Engineering-Supervision) | Wulf Brandt (Geothermie Consulting-Engineering-Supervision) | Peter Schulz (H. Anger's Söhne Bohr- und Brunnenbaugesellschaft mbH)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- August 2017
- Document Type
- Journal Paper
- 228 - 237
- 2017.Society of Petroleum Engineers
- geothermal, scaling, airlift, reverse cleanout, Groß Schönebeck
- 3 in the last 30 days
- 283 since 2007
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During production of geothermal brine at the Groß Schönebeck research site, large and heavy solid particles accumulated within the cased reservoir interval of the production well. A wellbore obstruction at a depth of approximately 4100 m (13,452 ft) was caused by copper-, barite-, lead-, and iron-mineral precipitates with a size of up to 1 cm and elongated coating fragments from the production tubing with a length of up to 10 cm. After a failed reverse-cleanout operation by use of 2-in. coiled tubing (CT), lifting the fluid column within the drillstring (DS) was considered to be the most cost-efficient option to clean out the wellbore while simultaneously minimizing fluid invasion into the reservoir. Here, preliminary considerations for the operation and field observations are presented together with a monitoring concept. The field data are used to calibrate a hydraulic model that is then applied to understand hydraulic processes downhole. On the basis of the hydraulic considerations, aspects to optimize the cleanout efficiency are discussed.
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