Field Trials of the New DFIT-Flowback Analysis (DFIT-FBA) for Accelerated Estimates of Closure and Reservoir Pressure and Reservoir Productivity

Zanganeh, Behnam; Clarkson, Christopher R.; Côté, Alexander; Richards, Brenton

doi:10.15530/urtec-2020-2838

Cited by 9 publications

(3 citation statements)

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“…There are different flow regimes during flowback. A log-log plot of rate normalized pressure (RNP) with respect to material balance time (MBT) can be used to identify the different flow regimes (Zanganeh et al 2020).…”

Section: Closure Stress Evaluation From a Plot Of Rate Normalized Pressure Versus Materials Balance Timementioning

confidence: 99%

“…If a boundary-dominated flow is observed, the flowing material balance method can be used to estimate the "initial water-in-place in the fluid bank region" (Zanganeh et al 2020). For the boundary-dominated flow, the flowing material balance equation can be written in the form of a straight line as (Clarkson and Williams-Kovacs 2019) where PNR denotes pressure normalized rate, m f is the slope of the flow material balance plot, b f is the intercept, and c t is the compressibility including both the water compressibility and the formation compressibility.…”

Section: Reservoir Compressibility Evaluation Through Flowing Materials Balance Analysismentioning

confidence: 99%

“…Ideally, pumpin/flowback methods can reduce the operational time, and therefore serve as a substitute for unreasonably long shutin periods in Diagnostic Fracture Injection Testing (DFIT). In addition to inferring in-situ stresses, pump-in/flowback methods can also be used to assess formation permeability (permeability thickness product), formation compressibility, and reservoir pressure (Zanganeh et al 2020). This study presented pump-in/flowback data for Well 58-32 at the FORGE site.…”

Section: Introductionmentioning

confidence: 99%

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Flowback Test Analyses at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE) Site

et al. 2021

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In 2017 and 2019, injection testing was carried out in three zones in a vertical well in granite at the Frontier Observatory for Research in Geothermal Energy site near Milford, Utah, USA. In several injection cycles, flowback was implemented rather than shut-in. The goal was to explore an alternative to prolonged shut-in periods for inferring closure stress, formation compressibility, and formation permeability (permeability thickness product). The flowback procedures involved a cyclic flowback/shut-in, while pressure decreased. The flowback data are presented, and analyses are shown. The inferred closure stress(es) from flowback analyses are lower than for equivalent injection cycles that were strictly shut-in. Relatively high formation compressibility obtained from the flowback analyses indicates an extensive, fractured system. This study also includes numerical simulation of the flowback events. The numerical model shows that the rebound pressure is not necessarily the lower bound of the minimum principal stress. The signature of stiffness change can be identified as the process when the depletion mainly transitions from hydraulic fracture to natural fractures from numerical analysis. Overall, flowback potentially has advantages over shut-in because of the reduced time to closure.

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Section: Closure Stress Evaluation From a Plot Of Rate Normalized Pressure Versus Materials Balance Timementioning

confidence: 99%

Section: Reservoir Compressibility Evaluation Through Flowing Materials Balance Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flowback Test Analyses at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE) Site

et al. 2021

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Rate-transient analysis as a tool to assist with exploration and field development optimization

Clarkson

2021

Unconventional Reservoir Rate-Transient Analysis

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Application of DFIT-FBA Tests Performed at Multiple Points in a Horizontal Well for Advanced Treatment Stage Design and Reservoir Characterization

Zeinabady

Zanganeh

Shahamat³

et al. 2021

Day 2 Wed, May 05, 2021

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The DFIT flowback analysis (DFIT-FBA) method, recently developed by the authors, is a new approach for obtaining minimum in-situ stress, reservoir pressure, and well productivity index estimates in a fraction of the time required by conventional DFITs. The goal of this study is to demonstrate the application of DFIT-FBA to hydraulic fracturing design and reservoir characterization by performing tests at multiple points along a horizontal well completed in an unconventional reservoir. Furthermore, new corrections are introduced to the DFIT-FBA method to account for perforation friction, tortuosity, and wellbore unloading during the flowback stage of the test. The time and cost efficiency associated with the DFIT-FBA method provides an opportunity to conduct multiple field tests without delaying the completion program. Several trials of the new method were performed for this study. These trials demonstrate application of the DFIT-FBA for testing multiple points along the lateral of a horizontal well (toe stage and additional clusters). The operational procedure for each DFIT-FBA test consists of two steps: 1) injection to initiate and propagate a mini hydraulic fracture and 2) flowback of the injected fluid on surface using a variable choke setting on the wellhead. Rate transient analysis methods are then applied to the flowback data to identify flow regimes and estimate closure and reservoir pressure. Flowing material balance analysis is used to estimate the well productivity index for studied reservoir intervals. Minimum in-situ stress, pore pressure and well productivity index estimates were successfully obtained for all the field trials and validated by comparison against a conventional DFIT. The new corrections for friction and wellbore unloading improved the accuracy of the closure and reservoir pressures by 4%. Furthermore, the results of flowing material balance analysis show that wellbore unloading might cause significant over-estimation of the well productivity index. Considerable variation in well productivity index was observed from the toe stage to the heel stage (along the lateral) for the studied well. This variation has significant implications for hydraulic fracture design optimization, particularly treatment pressures and volumes.

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Field Trials of the New DFIT-Flowback Analysis (DFIT-FBA) for Accelerated Estimates of Closure and Reservoir Pressure and Reservoir Productivity

Cited by 9 publications

References 0 publications

Flowback Test Analyses at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE) Site

Flowback Test Analyses at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE) Site

Rate-transient analysis as a tool to assist with exploration and field development optimization

Application of DFIT-FBA Tests Performed at Multiple Points in a Horizontal Well for Advanced Treatment Stage Design and Reservoir Characterization

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