TY - GEN
T1 - Geochemical Investigation of Water Composition Effect on Formation Damage and Related Oil Recovery in Carbonates
AU - Khurshid, Ilyas
AU - Al-Shalabi, Emad W.
AU - Alameri, Waleed
N1 - Funding Information:
The authors wish to acknowledge Khalifa University of Science and Technology for funding this research. This publication is based upon work supported by the Khalifa University of Science and Technology under Award No. [FSU-2018-26]. We appreciate David L. Parkhurst of the USGS for his support in coupling IPhreeqc with Matlab.
Publisher Copyright:
Copyright 2022, Society of Petroleum Engineers.
PY - 2022
Y1 - 2022
N2 - Several benefits of low salinity/engineered water injection (LSWI/EWI) have been reported in the literature including its ability to increase oil recovery at low cost and with least environmental impact. However, the related reservoir-engineering problems to these techniques such as formation damage and fluid mobility control are still uncertain and have not been thoroughly investigated. This study investigates the effect of water composition on formation damage and the related oil recovery from a geochemical prospective. The study presents coupling of the IPhreeqc geochemical engine with Matlab to simultaneously solve the oil-water multiphase flow and the related geochemical reactions. Using this coupling technique, the geochemical capabilities of Phreeqc were successfully incorporated in a multiphase flow simulator. The latter enabled modeling of reactive transport and formation damage in subsurface multiphase reservoir. The results showed that the temperature, sulfate concentration, and dilution of injection water have a pronounced effect on formation dissolution and precipitation during LSWI/EWI. Also, anhydrite scale is the main controlling solid specie for formation damage. In addition, high temperature water injection should be avoided in carbonate reservoirs due to the likelihood of anhydrite precipitation and formation damage. This precipitation occurs because of the low-solubility of anhydrite at high temperature. Moreover, water dilution could decrease the scale formation while sulfate spiking might increase scale precipitation. Hence, sulfate concentration should be optimized as a wettability alteration agent to enhance oil recovery while avoid formation damage. Furthermore, as a sequence of anhydrite precipitation by sulfate spiking, oil production is expected to decrease by around 23% in the selected case study. The dissolution and precipitation mechanisms during LSWI are very case-dependent and subject of pore distribution, crude oil/brine/rock compositions, and thermodynamic conditions. Hence, the findings of this study cannot be generalized.
AB - Several benefits of low salinity/engineered water injection (LSWI/EWI) have been reported in the literature including its ability to increase oil recovery at low cost and with least environmental impact. However, the related reservoir-engineering problems to these techniques such as formation damage and fluid mobility control are still uncertain and have not been thoroughly investigated. This study investigates the effect of water composition on formation damage and the related oil recovery from a geochemical prospective. The study presents coupling of the IPhreeqc geochemical engine with Matlab to simultaneously solve the oil-water multiphase flow and the related geochemical reactions. Using this coupling technique, the geochemical capabilities of Phreeqc were successfully incorporated in a multiphase flow simulator. The latter enabled modeling of reactive transport and formation damage in subsurface multiphase reservoir. The results showed that the temperature, sulfate concentration, and dilution of injection water have a pronounced effect on formation dissolution and precipitation during LSWI/EWI. Also, anhydrite scale is the main controlling solid specie for formation damage. In addition, high temperature water injection should be avoided in carbonate reservoirs due to the likelihood of anhydrite precipitation and formation damage. This precipitation occurs because of the low-solubility of anhydrite at high temperature. Moreover, water dilution could decrease the scale formation while sulfate spiking might increase scale precipitation. Hence, sulfate concentration should be optimized as a wettability alteration agent to enhance oil recovery while avoid formation damage. Furthermore, as a sequence of anhydrite precipitation by sulfate spiking, oil production is expected to decrease by around 23% in the selected case study. The dissolution and precipitation mechanisms during LSWI are very case-dependent and subject of pore distribution, crude oil/brine/rock compositions, and thermodynamic conditions. Hence, the findings of this study cannot be generalized.
UR - http://www.scopus.com/inward/record.url?scp=85127990326&partnerID=8YFLogxK
U2 - 10.2118/200249-MS
DO - 10.2118/200249-MS
M3 - Conference contribution
AN - SCOPUS:85127990326
T3 - Society of Petroleum Engineers - SPE Conference at Oman Petroleum and Energy Show, OPES 2022
BT - Society of Petroleum Engineers - SPE Conference at Oman Petroleum and Energy Show, OPES 2022
T2 - 2022 SPE Conference at Oman Petroleum and Energy Show, OPES 2022
Y2 - 21 March 2022 through 23 March 2022
ER -