Optimization of enhanced oil recovery using ASP solution
Landson Soares Marques,
Pamela Dias Rodrigues,
George Simonelli,
Denilson de Jesus Assis,
Cristina M. Quintella,
Ana Katerine de Carvalho Lima Lobato,
Olívia Maria Cordeiro de Oliveira,
Luiz Carlos Lobato dos Santos
Affiliations
Landson Soares Marques
Oil, Gas, and Biofuels Research Group (PGBio), Postgraduate Program of Chemical Engineering (PPEQ), Federal University of Bahia (UFBA), R. Prof. Aristides Novis, 2, 2° floor, Federação, CEP 40210-630, Salvador, BA, Brazil; Corresponding author.
Pamela Dias Rodrigues
Institute and Center for Energy and Environment (CIENAM), Federal University of Bahia (UFBA), R. Av. Adhemar de Barros, s/n, 2° floor, Ondina, CEP 40301-110, Salvador, BA, Brazil
George Simonelli
Oil, Gas, and Biofuels Research Group (PGBio), Postgraduate Program of Chemical Engineering (PPEQ), Federal University of Bahia (UFBA), R. Prof. Aristides Novis, 2, 2° floor, Federação, CEP 40210-630, Salvador, BA, Brazil
Denilson de Jesus Assis
Engineering School, Salvador University (UNIFACS), Av. Tancredo Neves, 2131, Caminho das Árvores, CEP 40231-902, Salvador, BA, Brazil
Cristina M. Quintella
Institute and Center for Energy and Environment (CIENAM), Federal University of Bahia (UFBA), R. Av. Adhemar de Barros, s/n, 2° floor, Ondina, CEP 40301-110, Salvador, BA, Brazil
Ana Katerine de Carvalho Lima Lobato
Oil, Gas, and Biofuels Research Group (PGBio), Postgraduate Program of Chemical Engineering (PPEQ), Federal University of Bahia (UFBA), R. Prof. Aristides Novis, 2, 2° floor, Federação, CEP 40210-630, Salvador, BA, Brazil; Engineering School, Salvador University (UNIFACS), Av. Tancredo Neves, 2131, Caminho das Árvores, CEP 40231-902, Salvador, BA, Brazil
Olívia Maria Cordeiro de Oliveira
Postgraduate Program of Geochemistry, Federal University of Bahia (UFBA), R. Av. Adhemar de Barros, s/n, 2° floor, Ondina, CEP 40301-110, Salvador, BA, Brazil
Luiz Carlos Lobato dos Santos
Oil, Gas, and Biofuels Research Group (PGBio), Postgraduate Program of Chemical Engineering (PPEQ), Federal University of Bahia (UFBA), R. Prof. Aristides Novis, 2, 2° floor, Federação, CEP 40210-630, Salvador, BA, Brazil
Many studies have been conducted to focused on developing an optimal alkali/surfactant/polymer (ASP) composition to increase the recovered fraction of oil in reservoirs that have already undergone water injection. To analyze the effect of alkali (Na2CO3), surfactant (lauryl sodium sulfate), and polymer (commercial xanthan gum) concentration on oil recovery, a complete factorial experimental design was performed with combinations of three variables (alkali, surfactant, and polymer) and three central point replications (2³ + 3). The experiments were carried out on a core holder using rock samples from the Botucatu formation. The simulated oil reservoirs have an average permeability of 348 mD and a temperature of 60 °C. The crude oil was acquired from the Carmópolis field, with 25.72 °API. Synthetic production water containing 40,000 mg L−1 of NaCl and 13,000 mg L−1 of Na2SO4 was injected through an HPLC pump to saturate the rock samples and to recover the oil in the secondary step. From the experimental results, it was verified that the surfactant and polymer concentrations are the most statistically significant independent variables and that first-order interactions are not statistically significant for the process. The oil recovery factors in the secondary stage ranged between 30 and 36 % of the OOIP, which are within the range reported in the literature. The optimal composition of the ASP fluid obtained a recovered fraction of oil of 62 % in the advanced step. Other combinations reported in the literature used higher concentrations of alkali, surfactant, and polymer with lower recoveries and higher cost in the injection design. Thus, the present study highlights the necessity to investigate the performance of each component of the ASP solution. In addition, the results obtained in this study are very attractive for possible full-scale applications.
