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Title: DILUTE SURFACTANT METHODS FOR CARBONATE FORMATIONS

Abstract

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.

Authors:
Publication Date:
Research Org.:
University of Houston (US)
Sponsoring Org.:
(US)
OSTI Identifier:
815456
DOE Contract Number:  
FC26-02NT15322
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jan 2003
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; ADSORPTION; BRINES; CALCITE; CARBONATES; ENHANCED RECOVERY; FRACTURED RESERVOIRS; FRACTURES; SANDSTONES; SOLUBILITY; SURFACTANTS; WATERFLOODING; WETTABILITY

Citation Formats

Mohanty, Kishore K. DILUTE SURFACTANT METHODS FOR CARBONATE FORMATIONS. United States: N. p., 2003. Web. doi:10.2172/815456.
Mohanty, Kishore K. DILUTE SURFACTANT METHODS FOR CARBONATE FORMATIONS. United States. https://doi.org/10.2172/815456
Mohanty, Kishore K. 2003. "DILUTE SURFACTANT METHODS FOR CARBONATE FORMATIONS". United States. https://doi.org/10.2172/815456. https://www.osti.gov/servlets/purl/815456.
@article{osti_815456,
title = {DILUTE SURFACTANT METHODS FOR CARBONATE FORMATIONS},
author = {Mohanty, Kishore K},
abstractNote = {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.},
doi = {10.2172/815456},
url = {https://www.osti.gov/biblio/815456}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 2003},
month = {Wed Jan 01 00:00:00 EST 2003}
}