Turning Geothermal Injection Data into Results High-Resolution DAS-DTS Confirms Targeted Reservoir Containment Across Multiple Cycles

Quantify the thermal response rate of geothermal reservoir intervals following injection through warm-back analysis.
Optimize injection rates using step-rate testing and live downhole surveillance data.
Use distributed acoustic sensing (DAS) and distributed temperature sensing (DTS) data to confirm injection distribution across perforated reservoir intervals, identify out-of-zone injection or crossflow, and assess well integrity.
Characterize thermally induced fractures and reservoir behavior using high-resolution distributed temperature measurements.

Planned an intervention-based capillary DAS/DTS fiber optic deployment by reviewing customer-provided well information and defining the surveillance requirements.
Weatherford experts recommended the MARS™ Mature Asset Rejuvenation by Surveillance system, an advanced thru-tubing intervention and reservoir-intelligence system. Its unified sensors feature real-time DAS and DTS with complementary bottomhole (BHA) sensors for depth calibration and data correction.
Confirmed well access using slickline intervention services before deploying fiber optics in the live geothermal producer.
Acquired continuous real-time acoustic and temperature data from surface to total depth using single-mode and multimode fiber optic lines.
Used bottomhole sensors deployed on the 1/4-in capillary DAS/DTS line, including a casing collar locator, gamma ray, ProTherma™ pressure sensors, and ProTherma™ temperature sensors.
Combined Weatherford field surveillance expertise with capillary and slickline crews to execute the operation safely, collaboratively, and within operational requirements.

Completed a comprehensive one-week DAS/DTS survey across multiple cold- and hot-water injection cycles.
Confirmed injection distribution along the target reservoir and verified that injected fluid remained confined within the intended interval.
The one-week survey performance was faster than the time required for conventional noise logging and production logging tool deployment.
Streamed MARS system data live to the customer’s office for real-time analysis and decision-making.
Provided a dataset that supported optimization of injection rates from the geothermal producing well to the downstream distribution plant, helping reduce cost and save time.
Generated insight considered critical for optimizing existing wells and reservoirs and supporting the design of future geothermal wells.