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- W2288219538 abstract "Shale gas reservoirs with multistage hydraulic fractures are commonlycharacterized by analyzing long-term gas production data, but water flowback data isusually not included in the analysis. However, this work shows there can be benefits toincluding post-frac water flowback and long-term water production data in well analysis.In addition, field data indicate that only 10-40% of the frac water is recovered after theflowback. This work addresses two main question: Where is the rest of the injected fracfluid that is not recovered and what is the mechanism that is trapping it? And how can thewater flowback data be used in estimating effective fracture volume using production dataanalysis tools?A number of simulation cases were run for single and two phase (gas/water) formodeling flowback and long-term production periods. Various physical assumptions wereinvestigated for the saturations and properties that exist in the fracture/matrix system afterhydraulic fracturing. The results of these simulations were compared with analyticalsolutions and data from actual wells using diagnostic and specialized plots. The results ofthese comparisons led to certain conclusions and procedures describing possible reservoirconditions after hydraulic fracturing and during production.Past publications have suggested that the lost frac water is trapped in the naturalfracture or imbibed into the rock matrix near the fracture face. Natural fracture spacingcould be a possible explanation of the lost frac water. These concepts are tested and thechallenge of simulating a natural fracture with trapped water without imbibition is solved using a new hybrid relative permeability jail. This concept was tested for the period offlowback, shut-in and production.This work presents the benefits of a new method for combining water flowbackand long-term water production data in shale gas analysis. Water production analysis canprovide effective fracture volume which was confirmed by the cumulative produced water.This will help when evaluating fracture-stimulation jobs. It also shows the benefits ofcombining flowback and long-term water production data in the analysis of shale gaswells. In some cases, the time shift on diagnostic plots changes the apparent flow regimeidentification of early gas production data. This leads to different models of thefracture/matrix system. The presented work shows the importance of collecting andincluding water flowback data in long-term production data." @default.
- W2288219538 created "2016-06-24" @default.
- W2288219538 creator A5086954120 @default.
- W2288219538 date "2014-04-04" @default.
- W2288219538 modified "2023-09-27" @default.
- W2288219538 title "New Advances in Shale Gas Reservoir Analysis Using Water Flowback Data" @default.
- W2288219538 hasPublicationYear "2014" @default.
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