Exploration of Case Histories of DAS Fiber-Based Microseismic and Strain Data, Monitoring Horizontal Hydraulic Stimulations Using Various Tools to Highlight Physical Deformation Processes (Part A)

Hull, Robert; Meek, Robert; Bello, Hector; Miller, Douglas E.

doi:10.15530/urtec-2017-2695282

Cited by 46 publications

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“…The use of DAS for monitoring borehole seismic and acoustic signals has migrated from early field demonstration to commercial use within a span of 5 years [12,13,14,15,16]. The general principals of DAS are explained in the review by Miah and Potter [17] and the text by Hartog [18].…”

Section: Methodsmentioning

confidence: 99%

Distributed Acoustic Sensing of Strain at Earth Tide Frequencies

Becker

Coleman²

2019

Sensors

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The solid Earth strains in response to the gravitational pull from the Moon, Sun, and other planetary bodies. Measuring the flexure of geologic material in response to these Earth tides provides information about the geomechanical properties of rock and sediment. Such measurements are particularly useful for understanding dilation of faults and fractures in competent rock. A new approach to measuring earth tides using fiber optic distributed acoustic sensing (DAS) is presented here. DAS was originally designed to record acoustic vibration through the measurement of dynamic strain on a fiber optic cable. Here, laboratory experiments demonstrate that oscillating strain can be measured with DAS in the microHertz frequency range, corresponding to half-day (M2) lunar tidal cycles. Although the magnitude of strain measured in the laboratory is larger than what would be expected due to earth tides, a clear signal at half-day period was extracted from the data. With the increased signal-to-noise expected from quiet field applications and improvements to DAS using engineered fiber, earth tides could potentially be measured in deep boreholes with DAS. Because of the distributed nature of the sensor (0.25 m measurement interval over kilometres), fractures could be simultaneously located and evaluated. Such measurements would provide valuable information regarding the placement and stiffness of open fractures in bedrock. Characterization of bedrock fractures is an important goal for multiple subsurface operations such as petroleum extraction, geothermal energy recovery, and geologic carbon sequestration.

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Section: Methodsmentioning

confidence: 99%

Distributed Acoustic Sensing of Strain at Earth Tide Frequencies

Becker

Coleman²

2019

Sensors

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“…Distributed fiber-optic sensing (DFOS) techniques have been applied in hydraulic fracture characterization and calibration in unconventional reservoirs for fracturing propagation and geometry observation in the near-and far-field over the past two decades since the first DFOs were installed in 1993 [45], which generally are categorized into distributed acoustic sensing (DAS) (Figures 15 and 16a) and distributed temperature sensing (DTS) (Figure 16b). Usually, a permanent fiber-optic-cable system is placed and cemented externally on the monitor wellbore casing or through wirelines to obtain DAS and DTS measurements for clusters and stage efficiency [46,47]. DTS and DAS can be applied to interpret wellbore, near-wellbore and far-field regions.…”

Section: Fracture Propagation Modelingmentioning

confidence: 99%

Fracture Modeling of Shale Oil and Gas Reservoirs in Texas

Gao,

Ali,

Soliman

2023

Energies

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Formation fracturing is the method of choice for developing shale oil and gas reservoirs that constitute a gigantic resource in the U.S.A. and many other countries but are characterized by a low permeability in the nano-Darcy range. The oil production of Texas has increased by about 5 million B/D in 15 years as a result of shale exploitation by massive multistage hydraulic fracturing. The mathematical modeling of this fracturing process is complex and can be approached in several ways. This paper first gives a concise description of the fracturing process as carried out in Texas. Included are the ranges of the key reservoir properties, as well as the injection fluid volumes and pressure, the composition of the injected fluid, proppant type, and volume, and other relevant data. Also included are the number of fracture stages, methods of zonal isolation, and diagnostic techniques used. An important variable considered is flowback, in particular, fluid retention and oil and gas production. High-salinity water production is discussed. Given the above variables, the currently used fracture simulators are briefly considered and compared, both the geomechanics-based and fracture-propagation-based. No single simulator can model the complete process. The directions currently being followed are briefly described. Also discussed is the simulation of the re-fracturing process and its range of success in increasing oil recovery from about the original ~5% to ~8%. Future processes such as plasma fracturing are mentioned, and their future applicability is discussed for further increasing oil recovery.

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“…Early applications of conventional detection algorithms to DAS were relatively unsuccessful. For example, for monitoring hydraulic stimulation [ 101 ], 31 DAS events were found compared to 785 with conventional geophones. In [ 102 ], the DAS-based detection event count is reported to be 10% of the geophone-based one.…”

Section: Seismic Monitoringmentioning

confidence: 99%

“…The ability to deploy DAS fibers in wells located inside unconventional hydrocarbon reservoirs offers unprecedented opportunities in reservoir monitoring [ 101 , 104 , 113 ]. DAS is a broadband instrument whose response function reaches frequencies lower than 0.001 Hz [ 48 ].…”

Section: Reservoir Characterizationmentioning

confidence: 99%

Seismic Applications of Downhole DAS

Lellouch

Biondi

2021

Sensors

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Distributed Acoustic Sensing (DAS) is gaining vast popularity in the industrial and academic sectors for a variety of studies. Its spatial and temporal resolution is ever helpful, but one of the primary benefits of DAS is the ability to install fibers in boreholes and record seismic signals in depth. With minimal operational disruption, a continuous sampling along the trajectory of the borehole is made possible. Such resolution is highly challenging to obtain with conventional downhole tools. This review article summarizes different seismic uses, passive and active, of downhole DAS. We emphasize current DAS limitations and potential ways to overcome them.

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Exploration of Case Histories of DAS Fiber-Based Microseismic and Strain Data, Monitoring Horizontal Hydraulic Stimulations Using Various Tools to Highlight Physical Deformation Processes (Part A)

Cited by 46 publications

References 0 publications

Distributed Acoustic Sensing of Strain at Earth Tide Frequencies

Distributed Acoustic Sensing of Strain at Earth Tide Frequencies

Fracture Modeling of Shale Oil and Gas Reservoirs in Texas

Seismic Applications of Downhole DAS

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