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The analysis and interpretation of water-oil-ratio performance in petroleum reservoirs
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Our goal in this work is to develop and validate a multivariate relation for the behavior of the water-oil-ratio (WOR) and/or water cut (f) functions, where this relation would incorporate the reservoir and fluid properties for both phases (oil and water). The only significant assumption that we make in this work is that pseudosteady-state flow conditions must exist in the entire reservoir system. Our proposed model is an extension of traditional (i.e., steady-state) methods for the case of pseudosteady-state flow - for both the oil and water phases. In this work, the pseudosteady-state model reproduces observed field performance substantially better than any of the steady-state models. We believe that this approach can be applied to any reservoir system undergoing waterflood. The specific tasks achieved in this work include: 1. Development of a rigorous model for the simultaneous flow of oil and water at pseudosteady-state flow conditions. This model has been validated against 28 different field cases (all cases are included in Appendices A and B), and in all cases, the new model gives an excellent representation of the data. 2. Development of a "reciprocal rate plot" for the estimation of both the original oil-in-place (N), as well as the "movable oil" (N) at current producing conditions. This approach requires a plot of the reciprocal rate (1/q) versus the "oil material balance time," (N/q). 3. Development of a diagnostic technique for assessing (qualitatively) the efficiency/ effectiveness of a waterflood. This technique involves the use of the following log-log format plots: (the "associated functions" include the WOR-derivative, the WOR-integral, and the WOR-integral-derivative functions) -- WOR and WOR associated functions versus production time. WOR and WOR associated functions versus N/q. WOR and WOR associated functions versus (N+W)/ (q+q). 4. Application/interpretation of the following extrapolation methods for the water-oil-ratio (WOR) and the water cut (f) functions: q versus N. log(f) versus N. 1/f versus N. f versus N. log(WOR) versus N. Unfortunately, the formulation of the two-phase (oil-water), pseudosteady-state flow relation does not provide for a simple extrapolation formula for the estimation of movable fluids. This is an area for further investigation.
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Includes bibliographical references (leaves 79-80).
Issued also on microfiche from Lange Micrographics.
Bondar, Valentina (2001). The analysis and interpretation of water-oil-ratio performance in petroleum reservoirs. Master's thesis, Texas A&M University. Available electronically from
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