DILUTE SURFACTANT METHODS FOR CARBONATE FORMATIONS

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Description

There are many carbonate reservoirs in US (and the world) with light oil and fracture pressure below its minimum miscibility pressure (or reservoir may be naturally fractured). Many carbonate reservoirs are naturally fractured. Waterflooding is effective in fractured reservoirs, if the formation is water-wet. Many fractured carbonate reservoirs, however, are mixed-wet and recoveries with conventional methods are low (less than 10%). Thermal and miscible tertiary recovery techniques are not effective in these reservoirs. Surfactant flooding (or huff-n-puff) is the only hope, yet it was developed for sandstone reservoirs in the past. The goal of this research is to evaluate dilute ... continued below

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16 pages

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Mohanty, Kishore K. January 1, 2003.

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Description

There are many carbonate reservoirs in US (and the world) with light oil and fracture pressure below its minimum miscibility pressure (or reservoir may be naturally fractured). Many carbonate reservoirs are naturally fractured. Waterflooding is effective in fractured reservoirs, if the formation is water-wet. Many fractured carbonate reservoirs, however, are mixed-wet and recoveries with conventional methods are low (less than 10%). Thermal and miscible tertiary recovery techniques are not effective in these reservoirs. Surfactant flooding (or huff-n-puff) is the only hope, yet it was developed for sandstone reservoirs in the past. The goal of this research is to evaluate dilute (hence relatively inexpensive) surfactant methods for carbonate formations and identify conditions under which they can be effective. We have acquired field oil and core samples and field brine compositions from Marathon. We have conducted preliminary adsorption and wettability studies. Addition of Na{sub 2}CO{sub 3} decreases anionic surfactant adsorption on calcite surface. Receding contact angles increase with surfactant adsorption. Plans for the next quarter include conducting adsorption, phase behavior and wettability studies.

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16 pages

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OSTI as DE00815456

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  • Other Information: PBD: 1 Jan 2003

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  • Report No.: NONE
  • Grant Number: FC26-02NT15322
  • DOI: 10.2172/815456 | External Link
  • Office of Scientific & Technical Information Report Number: 815456
  • Archival Resource Key: ark:/67531/metadc734422

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  • January 1, 2003

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  • Oct. 18, 2015, 6:40 p.m.

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  • Jan. 3, 2017, 2:16 p.m.

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Mohanty, Kishore K. DILUTE SURFACTANT METHODS FOR CARBONATE FORMATIONS, report, January 1, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc734422/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.