Integrated Interpretation of Interwell Connectivity Using Injection and Production Fluctuations |
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| Authors: | Ali A Yousef Jerry L Jensen Larry W Lake |
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| Institution: | (1) Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, Austin, TX 78712, USA;(2) Saudi Aramco, Dhahran, Saudi Arabia;(3) Department of Chemical and Petroleum Engineering, The University of Calgary, 2500 University Drive NW, Calgary, AB, T2N 1N4, Canada |
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| Abstract: | A method to characterize reservoirs, based on matching temporal fluctuations in injection and production rates, has recently
been developed. The method produces two coefficients for each injector–producer pair; one parameter, λ, quantifies the connectivity and the other, τ, quantifies the fluid storage in the vicinity of the pair. Previous analyses used λ and τ separately to infer the presence of transmissibility barriers and conduits in the reservoir, but several common conditions
could not be easily distinguished. This paper describes how λ and τ can be jointly interpreted to enhance inference about preferential transmissibility trends and barriers. Two different combinations
are useful: one is a plot of log (λ) versus log (τ) for a producer and nearby injectors, and the second is a Lorenz-style flow capacity (F) versus storativity (C) plot. These techniques were tested against the results of a numerical simulator and applied to data from the North Buck
Draw field. Using the simulated data, we find that the F–C plots and the λ–τ plots are capable of identifying whether the connectivity of an injector–producer well pair is through fractures, a high-permeability
layer, multiple-layers or through partially completed wells. Analysis of data from the North Buck Draw field shows a reasonable
correspondence between τ and the tracer breakthrough times. Of two possible geological models for Buck Draw, the F–C and λ–τ plots support the model that has less connectivity in the field. The wells in fluvial deposits show better communication
than those wells in more estuarine-dominated regions. |
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| Keywords: | Lorenz plot North Buck Draw field Reservoir characterization Capacitance model |
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