URTeC

Join us at URTeC July 24-26 in booth 833 to learn more about our Distributed Fiber Optic Sensing (DFOS) and how it helps you monitor cluster efficiency and cross-well strain in real time to optimize fracture stimulation and reservoir understanding.
Our DFOS technology offers borehole seismic acquisition, hydraulic fracture profiling and production flow monitoring in real time, from a single system. Using Distributed Acoustic Sensing (DAS) technology, this system enables operators to characterize the reservoir, ensure successful completion operations, monitor fracture performance and cluster efficiency, and optimize future well designs.

Stop by and see us to learn more about our real-time cluster efficiency or read more about our capabilities online.

Technical Program

Our experts will be participating in this years technical program. Drop by to learn more about our many innovations in fiber optic sensing.

DAS Microseismic Monitoring and Integration With Strain Measurements in Hydraulic Fracture Profiling

  • Tuesday July 25
  • 2:40 pm – 3:05 pm
  • Room 16AB
Hydraulic fracturing operations in unconventional reservoirs are monitored using fiber-optic distributed acoustic sensing (DAS) located in treatment wells. A variety of physical effects, such as temperature, strain and microseismicity were measured and correlated with the treatment curves in the injected subsurface area to enhance our understanding of the reservoir.

A fiber-optic cable was installed in a treatment well in the Meramec Shale covering the entire length of the well from surface to target depth, resulting in approximately 1000 recorded channels. The large number of channels, combined with the wide aperture, allowed us to record and locate microseismic events and compare them to traditional DAS measurements such as crosswell strain.

During the treatment of two wells, temperature, strain, and microseismic activity were measured. During treatment of the well containing the fiber, three stages were recorded, and despite significant treatment-related noise, hundreds of events were detected and mapped. While treating a nearby well, 30 stages were recorded, resulting in over 4000 detected and mapped events due to the increased signal to noise ratio.

For a few stages, an independent standard borehole seismic multi-well microseismic monitoring program detected common events. These common events were typically in the magnitude range of -0.4 to -2. The DAS events showed highly complex wave forms within the frac zone indicating the temporal evolution of the rupturing process. The mapped locations of DAS events extended to a maximum of about 1500 feet from observation well, although the majority of DAS events were detected in the inter-well space and close to the treatment well due to the lower sensitivity of the fiber recording.

While we used a standard range of frequencies for microseismic analysis, at a lower frequency range we could measure crosswell strain, though temperature and strain effects can be intermingled. Specialized data processing was applied to remove temperature effects as much as possible and enhance the strain signatures. After obtaining differential strain estimates, we successfully correlated those signatures to the evolution of microseismic events in time and space.

The analysis of this DAS data set demonstrates that current fiber-optic technology can provide enough sensitivity to detect a significant number of microseismic events which we can integrate with temperature and strain data for an improved reservoir description.

Spotlight Capabilities

Our DFOS provides reservoir insight for the life of an asset. From characterizing the reservoir to profiling fracture completions and monitoring production levels in real time, these applications enable critical decisions to be made faster and with confidence. Discover more about the capabilities we will spotlight in our booth.

Distributed fiber optic sensing enables uniform fracture stimulation

Studies have shown that plug-and-perf completions often produce under-performing perforation clusters and undesired inter-well communication. To address under-performing perforation clusters, operators are combining fiber optic DAS and DTS measurements to calculate the amount of fluid and proppant placed in each cluster on the fly to enable optimized decision-making throughout a project ensure more effective fracturing on current and future wells.

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