Improved efficiency Of miscible CO[sub]2 floods and enhanced prospects for CO[sub]2 flooding heterogenous reservoirs: Quarterly technical progress report, January 1, 1997-March 31, 1997

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Task 1: The technical paper, `Assessment of Foam Properties and Effectiveness in Mobility Reduction for C0{sub 2} Foam Floods,` was prepared and presented at the 1997 SPE International Symposium on Oilfield Chemistry. The paper covers five surfactants tested earlier for their foam properties. Work is progressing on evaluating surfactants and their foam properties under high pressure conditions by using a foam durability apparatus. Two surfactants, Witcolate 1259 and Witcolate 1276, were tested in this quarter and the new data were added into our existing database for correlation between foam properties in the bulk phase and in porous media. The new ... continued below

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6 p.

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Grigg, R.B., Schechter, D.S., Chang, Shih-Hsien, Guo, Boyun, Tsau, Jyun-Syung, Casteel, J.F. May 31, 1997.

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Task 1: The technical paper, `Assessment of Foam Properties and Effectiveness in Mobility Reduction for C0{sub 2} Foam Floods,` was prepared and presented at the 1997 SPE International Symposium on Oilfield Chemistry. The paper covers five surfactants tested earlier for their foam properties. Work is progressing on evaluating surfactants and their foam properties under high pressure conditions by using a foam durability apparatus. Two surfactants, Witcolate 1259 and Witcolate 1276, were tested in this quarter and the new data were added into our existing database for correlation between foam properties in the bulk phase and in porous media. The new data support the earlier conclusion that foam stability and interfacial tension correlate with selective mobility reduction. Task 2: The changing permeability of the core during a series of foam tests is a significant factor in determining foam coreflood test parameters. A series of tests often requires hundreds of pore volumes of fluids to pass through the core. During this quarter, a new core was developed that should eliminate this problem and provide a constant base line. We ran a series of tests, which showed that this core has a constant permeability, as anticipated. We continued to examine procedures for history-matching production data from C0{sub 2}-foam oil production. The model mechanisms seen are very sensitive to the reservoir description. We have been examining different methods to develop a reservoir description. Task 3: The technical paper, `A Simple and Accurate Method for Determining Low IFT from Pendant Drop Measurements`, was prepared for and presented at the 1997 SPE International Symposium on Oilfield Chemistry. The paper described a new method for IFT determination developed on the basis of a force balance on the lower half of the pendant drop. The method developed is especially accurate for low-IFT systems where wettability effects often render classical LaPlace methods inaccurate. The investigation of C0{sub 2} gravity drainage in fractured reservoirs continues. We have an ongoing experiment using whole core and crude oil under reservoir conditions to investigate the effect of water saturation on the efficiency of C0{sub 2} gravity drainage. Before C0{sub 2} injection was initiated, the core was waterflooded to model a secondary waterflood, producing oil in the imbibition mode. After C0{sub 2} injection, oil production was lower while water was being produced concurrently, and then increased after water production ceased. We believe that excessive free water in the core hindered oil recovery during the earlier stage due to competing two-phase relative permeabilities. After 167 days, oil recovery reached 0.24 OOIP in a low-permeability reservoir core.

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6 p.

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OSTI as DE97054091

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  • Other Information: PBD: 31 May 1997

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  • Other: DE97054091
  • Report No.: DOE/BC/14977--T1
  • Grant Number: FG22-94BC14977
  • Office of Scientific & Technical Information Report Number: 567405
  • Archival Resource Key: ark:/67531/metadc698967

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  • May 31, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 10, 2015, 9:01 p.m.

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Grigg, R.B., Schechter, D.S., Chang, Shih-Hsien, Guo, Boyun, Tsau, Jyun-Syung, Casteel, J.F. Improved efficiency Of miscible CO[sub]2 floods and enhanced prospects for CO[sub]2 flooding heterogenous reservoirs: Quarterly technical progress report, January 1, 1997-March 31, 1997, report, May 31, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc698967/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.