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• W4241640216 abstract "Abstract Reservoir deformations associated with large pore pressure drawdowns can play a significant pore pressure drawdowns can play a significant role in the production performance of deep oil and brine reservoirs. In order to evaluate these effects, laboratory measurements were performed at simulated in-situ conditions on core from geopressured production intervals from the T-F&S/DOE Gladys McCall No. 1 Well, Cameron Parish, Louisiana. The test conditions ranged around 15,000 psi (103 MPa) confining pressure, 4000 psi (28 MPa) vertical deviatoric stress, and 13,000 psi (90 MPa) pore pressure at temperatures of 300F (149C). Reservoir drawdown was simulated by reducing the pore pressure at constant lateral strain and overburden stress. Elastic moduli, failure strengths and creep rates were determined from the tests. A number of permeability measurements were also carried out. The effect of reservoir drawdown on the production potential was assessed by combining production potential was assessed by combining these measurements with a simple one-dimensional liquid phase reservoir model. It was found that creep rates considered very low on the laboratory scale may have a significant effect on the production. Recoverable reserves were found to increase by as much as 25–50% due to creep compaction. Introduction The production performance of an underground reservoir is affected by a variety of rock properties as well as the regional geology and the production history. The mechanical deformation characteristics of the reservoir rock play an increasingly important role for reservoirs expected to undergo large pore pressure drawdown. Also, these effects pore pressure drawdown. Also, these effects become more significant for low compressibility reservoirs fully saturated with liquids. Deep oil and brine reservoirs are expected to fall in this category. Geothermal/geopressured aquifers in the U.S. Gulf Coast area are an example of such reservoirs. The Division of Geothermal Energy of the U.S. Department of Energy (DOE/DGE) in cooperation with private industry has been evaluating the technological and commercial feasibility of exploiting the geopressured/geothermal resource in the U.S. Gulf Coast area. An extensive program to design, drill and test wells in this area is being conducted to aid the evaluation process. The Technadril-Fenix and Scisson/DOE (referred to as T-F&S/ DOE) Gladys McCall No. 1 well was drilled in Cameron Parish, Louisiana as a part of this program. The program included a systematic investigation of rock properties in the laboratory on core taken from the reservoir. Geopressured reservoirs are expected to undergo large pore pressure reductions (~5,000 psi, 34 MPa) during their production. The pressure psi, 34 MPa) during their production. The pressure reductions will cause reservoir deformations which may in turn lead to some desirable effects such as compaction drive as well as some undesirable effects such as subsidence and permeability reduction. To identify and to model these effects, it is necessary to evaluate various reservoir properties, which include elastic moduli, time-dependent stress-strain response, permeabilities, and ultimate failure strengths. It is well known that many of the rock properties of interest depend on the state of stress, stress history and temperature. Therefore, laboratory tests were conducted on core material from the horizons of interest under simulated in-situ conditions. The stress paths followed during the tests approximated the pressure changes expected to occur during the reservoir drawdown. This paper describes these tests along with the possible implications of the various measurements on production performance. The production performance of a reservoir is affected by the rock deformations in two ways: on one hand, compaction drive results from fluid compression due to reduction in pore volume leading to pore pressure maintenance and increased recoverable reserves, and on the other hand, wellbore pressure decreases faster for constant rate production due to permeability reduction associated with the decrease in porosity." @default.
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• W4241640216 date "1983-10-05" @default.
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• W4241640216 title "Mechanical Properties of Geopressured Core and Their Influence on Reservoir Performance: T-F and S/DOE Gladys McCall No. 1 Well" @default.
• W4241640216 doi "https://doi.org/10.2118/12191-ms" @default.
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