Optimization of smart water flooding in carbonate reservoir

Mahmood Fani, Hamoud Al Hadhrami, Peyman Pourafshary, G. Reza Vakili-Nezhaad, Nader Mosavat

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

During smart water injection into carbonates, wettability alteration is subjected to be the main mechanism contributing to incremental oil recovery. Apart from the smart water composition, level of dilution, and the underlying mechanisms, "injection scheme" is of a great importance when developing a field scale flooding project. The pivotal target of this paper is to evaluate the efficiency of smart water injection by deploying tertiary smart water "shock slug" injection within the periods of water flooding. At the first stage, genuine reservoir brine was 10 times diluted. Ion Chromatography analysis was utilized to optimize the composition by adding 2.65 g/ml of MgSO4.7H2O. Core samples were initially flooded by the original high salinity water to reach the residual oil saturation. Smart water shock slugs were chosen in various volumes including, .75, 1, 1.5, and 2 PV. Subsequently, smart water was injected for the selected shock slug sizes. At this stage the procedure was stopped for 12 hours in order to let the smart water interact with rock sample. Afterward the process was followed by the high salinity water injection. To have a comprehensive perspective of the procedure, production data was recorded at all stages of the injection. Also, the contact angle was measured under standard condition by generating a sessile drop of oil on the carbonate surface submerged in the brine environment. The pH of the injection fluids was also measured during contact angle and core flood tests. X-Ray Diffraction inspection was utilized to analyze the mineralogy of the core samples. Evaluating the results of the contact angle measurements, it was obtained that smart water was capable of altering the wettability towards more water wet. pH of smart water was increased after it was kept in contact with the oil-aged rock for two weeks. Core flooding results indicated that the tertiary injection of the smart water as shock slug leads to a considerable amount of incremental oil recovery at tertiary mode and changes the wettability towards more water wet. This is mainly due to the effective ionic exchange which leads to the favorable wettability alteration during smart water injection. This study showed that smaller sizes of smart water shock slug can increase the incremental recovery as effective as larger sizes of smart water shock slug in analogues situation. Hence, the asserted method can be a good alternative for conventional low salinity water flooding due to being less time-consuming and cost-effective.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018
PublisherSociety of Petroleum Engineers
ISBN (Electronic)9781613996324
Publication statusPublished - Jan 1 2019
EventAbu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018 - Abu Dhabi, United Arab Emirates
Duration: Nov 12 2018Nov 15 2018

Other

OtherAbu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018
CountryUnited Arab Emirates
CityAbu Dhabi
Period11/12/1811/15/18

Fingerprint

Carbonates
flooding
carbonate
Water
slug
water
Water injection
wettability
Oils
Wetting
Contact angle
oil
Core samples
Recovery
brine
Rocks
Ion chromatography
fluid injection
Mineralogy
ion chromatography

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology
  • Fuel Technology

Cite this

Fani, M., Al Hadhrami, H., Pourafshary, P., Vakili-Nezhaad, G. R., & Mosavat, N. (2019). Optimization of smart water flooding in carbonate reservoir. In Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018 Society of Petroleum Engineers.

Optimization of smart water flooding in carbonate reservoir. / Fani, Mahmood; Al Hadhrami, Hamoud; Pourafshary, Peyman; Vakili-Nezhaad, G. Reza; Mosavat, Nader.

Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018. Society of Petroleum Engineers, 2019.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Fani, M, Al Hadhrami, H, Pourafshary, P, Vakili-Nezhaad, GR & Mosavat, N 2019, Optimization of smart water flooding in carbonate reservoir. in Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018. Society of Petroleum Engineers, Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018, Abu Dhabi, United Arab Emirates, 11/12/18.
Fani M, Al Hadhrami H, Pourafshary P, Vakili-Nezhaad GR, Mosavat N. Optimization of smart water flooding in carbonate reservoir. In Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018. Society of Petroleum Engineers. 2019
Fani, Mahmood ; Al Hadhrami, Hamoud ; Pourafshary, Peyman ; Vakili-Nezhaad, G. Reza ; Mosavat, Nader. / Optimization of smart water flooding in carbonate reservoir. Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018. Society of Petroleum Engineers, 2019.
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N2 - During smart water injection into carbonates, wettability alteration is subjected to be the main mechanism contributing to incremental oil recovery. Apart from the smart water composition, level of dilution, and the underlying mechanisms, "injection scheme" is of a great importance when developing a field scale flooding project. The pivotal target of this paper is to evaluate the efficiency of smart water injection by deploying tertiary smart water "shock slug" injection within the periods of water flooding. At the first stage, genuine reservoir brine was 10 times diluted. Ion Chromatography analysis was utilized to optimize the composition by adding 2.65 g/ml of MgSO4.7H2O. Core samples were initially flooded by the original high salinity water to reach the residual oil saturation. Smart water shock slugs were chosen in various volumes including, .75, 1, 1.5, and 2 PV. Subsequently, smart water was injected for the selected shock slug sizes. At this stage the procedure was stopped for 12 hours in order to let the smart water interact with rock sample. Afterward the process was followed by the high salinity water injection. To have a comprehensive perspective of the procedure, production data was recorded at all stages of the injection. Also, the contact angle was measured under standard condition by generating a sessile drop of oil on the carbonate surface submerged in the brine environment. The pH of the injection fluids was also measured during contact angle and core flood tests. X-Ray Diffraction inspection was utilized to analyze the mineralogy of the core samples. Evaluating the results of the contact angle measurements, it was obtained that smart water was capable of altering the wettability towards more water wet. pH of smart water was increased after it was kept in contact with the oil-aged rock for two weeks. Core flooding results indicated that the tertiary injection of the smart water as shock slug leads to a considerable amount of incremental oil recovery at tertiary mode and changes the wettability towards more water wet. This is mainly due to the effective ionic exchange which leads to the favorable wettability alteration during smart water injection. This study showed that smaller sizes of smart water shock slug can increase the incremental recovery as effective as larger sizes of smart water shock slug in analogues situation. Hence, the asserted method can be a good alternative for conventional low salinity water flooding due to being less time-consuming and cost-effective.

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