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Title: The effect of organic acids on wettability of sandstone and carbonate rocks

Abstract

This paper examines the role of crude oil’s organic acid surface active compounds (SAC) in determining the reservoir wettability over a range of salinities and temperatures. To isolate the effects of individual SACs, this project used model oil mixtures of pure decane and single SACs to represent the oleic phase. Due to the large number of experiments in this study, we used wettability measurement method by the modified flotation technique (MFT) to produce fast, reliable, and quantitative results. The results showed that oil wetting by decane increased with temperature for carbonate rocks. Sandstones oil wetting showed little temperature dependency. The presence of long-chained acids in decane increased oil wetting in sandstone and carbonate rocks as salinity was lowered, while the short-chained acid increased water wetting under the same conditions. The effect of organic acids on wettability was slightly enhanced with increasing temperature for all rock types.

Authors:
 [1];  [2];  [1];  [3]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Engineered Salinity, Laramie, WY (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1429692
Report Number(s):
SAND-2017-12495J
Journal ID: ISSN 0920-4105; PII: S0920410518300421
Grant/Contract Number:
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Petroleum Science and Engineering
Additional Journal Information:
Journal Volume: 165; Journal Issue: C; Journal ID: ISSN 0920-4105
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Mwangi, Paulina, Brady, Patrick V., Radonjic, Mileva, and Thyne, Geoffrey. The effect of organic acids on wettability of sandstone and carbonate rocks. United States: N. p., 2018. Web. doi:10.1016/j.petrol.2018.01.033.
Mwangi, Paulina, Brady, Patrick V., Radonjic, Mileva, & Thyne, Geoffrey. The effect of organic acids on wettability of sandstone and carbonate rocks. United States. doi:10.1016/j.petrol.2018.01.033.
Mwangi, Paulina, Brady, Patrick V., Radonjic, Mileva, and Thyne, Geoffrey. Wed . "The effect of organic acids on wettability of sandstone and carbonate rocks". United States. doi:10.1016/j.petrol.2018.01.033.
@article{osti_1429692,
title = {The effect of organic acids on wettability of sandstone and carbonate rocks},
author = {Mwangi, Paulina and Brady, Patrick V. and Radonjic, Mileva and Thyne, Geoffrey},
abstractNote = {This paper examines the role of crude oil’s organic acid surface active compounds (SAC) in determining the reservoir wettability over a range of salinities and temperatures. To isolate the effects of individual SACs, this project used model oil mixtures of pure decane and single SACs to represent the oleic phase. Due to the large number of experiments in this study, we used wettability measurement method by the modified flotation technique (MFT) to produce fast, reliable, and quantitative results. The results showed that oil wetting by decane increased with temperature for carbonate rocks. Sandstones oil wetting showed little temperature dependency. The presence of long-chained acids in decane increased oil wetting in sandstone and carbonate rocks as salinity was lowered, while the short-chained acid increased water wetting under the same conditions. The effect of organic acids on wettability was slightly enhanced with increasing temperature for all rock types.},
doi = {10.1016/j.petrol.2018.01.033},
journal = {Journal of Petroleum Science and Engineering},
number = C,
volume = 165,
place = {United States},
year = {Wed Feb 21 00:00:00 EST 2018},
month = {Wed Feb 21 00:00:00 EST 2018}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on February 21, 2019
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