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Jiang W, Lv W, Jia N, Cheng K, Wan Y, Wang K. Molecular Insights into Soaking in Hybrid N 2-CO 2 Huff-n-Puff: A Case Study of a Single Quartz Nanopore-Hydrocarbon System. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:14922-14940. [PMID: 38990799 DOI: 10.1021/acs.langmuir.4c00989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/13/2024]
Abstract
Hybrid N2-CO2 huff-n-puff (HnP) has been experimentally demonstrated to be a promising approach for improving oil recovery from tight/ultratight shale oil reservoirs. Despite this, the detailed soaking process and interaction mechanisms remain unclear. Adopting molecular dynamic simulations, the soaking behavior of hybrid N2-CO2 HnP was investigated at the molecular and atomic levels. Initially, the soaking process of fluid pressure equilibrium after injection pressure decays in a single matrix nanopore connected to a shale oil reservoir is studied. The study revealed that counter-current and cocurrent displacement processes exist during the CO2 and hybrid N2-CO2 soaking, but cocurrent displacement occurs much later than counter-current displacement. Although the total displacement efficiency of the hybrid N2-CO2 soaking system is lower than that of the CO2 soaking system, the cocurrent displacement initiates earlier in the hybrid N2-CO2 soaking system than in the CO2 soaking system. Moreover, the N2 soaking process is characterized by only counter-current displacement. Next, the soaking process of fluid pressure nonequilibrium before the injection pressure decays is investigated. It was discovered that counter-current and cocurrent displacement processes initiate simultaneously during the CO2, N2, and hybrid N2-CO2 soaking process, but cocurrent displacement exerts a dominant influence. During the CO2 soaking process, many hydrocarbon molecules in the nanopore are dissolved in CO2 while simultaneously exhibiting a substantial retention effect in the nanopore. After pure N2 injection, there is a tendency to form a favorable path of N2 through the oil phase. The injection of hybrid CO2-N2 facilitates the most significant cocurrent displacement effect and the reduction in residual oil retained in the nanopore during the soaking process, thus resulting in the best oil recovery. However, the increase rate in total displacement efficiencies of the different soaking systems over time (especially the hybrid N2-CO2 soaking system) was significantly larger before than after injection pressure decays. Additionally, the displacement effect induced by oil volume swelling is significantly restricted before the injection pressure decays compared to the soaking process after the injection pressure decays. This study explains the role of CO2-induced oil swelling and N2-induced elastic energy played by hybrid N2 and CO2 at different stages of the hybrid N2-CO2 soaking process before and after pressure decays and provides theoretical insights for hybrid gas HnP-enhanced recovery. These pore-scale results highlight the importance of injection pressure and medium composition during the soaking process in unconventional oil reservoirs.
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Affiliation(s)
- Wen Jiang
- College of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China
- Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, P. R. China
| | - Weifeng Lv
- Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China
- State Key Laboratory of Enhanced Oil and Gas Recovery, Beijing 100083, China
- Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, P. R. China
| | - Ninghong Jia
- State Key Laboratory of Enhanced Oil and Gas Recovery, Beijing 100083, China
- Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, P. R. China
| | - Kai Cheng
- Beijing Key Laboratory for Greenhouse Gas Storage and CO2-EOR Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, P. R. China
| | - Yidi Wan
- Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, P. R. China
- School of Earth and Space Sciences, Peking University, Beijing 100871, P. R. China
| | - Kai Wang
- College of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China
- Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, P. R. China
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Chen K, Jing X, Zhang H, Wang Y, Wang Y, Xie W, Shuai C, Wen B, Zhang N, Zhang P, Wu H, Li S, Wang L. Interfacial behaviour of short-chain fluorocarbon surfactants at the n-hexane/water interface: a molecular dynamics study. Acta Crystallogr C Struct Chem 2024; 80:284-290. [PMID: 38888891 DOI: 10.1107/s205322962400528x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Accepted: 06/04/2024] [Indexed: 06/20/2024] Open
Abstract
The utilization of long-chain fluorocarbon surfactants is restricted due to environmental regulations, prompting a shift in the focus of research towards short-chain fluorocarbon surfactants. The present study employs molecular dynamics techniques to model the behaviour of potassium perfluorobutylsulfonate (PFBS) at the n-hexane/water interface, aiming to investigate the efficacy of short-chain fluorocarbon surfactants in enhancing oil recovery. The findings suggest that ionized PFBS- has the ability to autonomously migrate to the oil/water interface, forming a layered thin film, with the sulfonic acid group being submerged in water, while the fluorocarbon chain is oriented towards the oil phase. This phenomenon aligns with the fundamental concept of surfactants in reducing interfacial tension between oil and water. The spontaneous dispersion process is supported by changes in the number of water molecules surrounding each PFBS- anion, as is well indicated by the number density distribution within the simulation box. Based on the analysis conducted by IGMH (Independent Gradient Model based on Hirshfeld partition), it was determined that sulfonic acid molecules are capable of forming hydrogen bonds with water molecules, whereas the interaction between fluorocarbon chains and the oil phase is predominantly characterized by weak van der Waals interactions.
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Affiliation(s)
- Ke Chen
- Sichuan Shale Gas Exploration and Development Co. Ltd, Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610065, People's Republic of China
| | - Xianwu Jing
- Research Institute of Natural Gas Technology, PetroChina Southwest Oil and Gasfield, Chengdu, Sichuan 610213, People's Republic of China
| | - Huali Zhang
- Sichuan Shale Gas Exploration and Development Co. Ltd, Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610065, People's Republic of China
| | - Yujie Wang
- Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610056, People's Republic of China
| | - Yezhong Wang
- Sichuan Shale Gas Exploration and Development Co. Ltd, Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610065, People's Republic of China
| | - Wuping Xie
- Sichuan Shale Gas Exploration and Development Co. Ltd, Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610065, People's Republic of China
| | - Chungang Shuai
- Sichuan Shale Gas Exploration and Development Co. Ltd, Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610065, People's Republic of China
| | - Bo Wen
- Sichuan Shale Gas Exploration and Development Co. Ltd, Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610065, People's Republic of China
| | - Nanqiao Zhang
- Sichuan Shale Gas Exploration and Development Co. Ltd, Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610065, People's Republic of China
| | - Peiyu Zhang
- Sichuan Shale Gas Exploration and Development Co. Ltd, Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610065, People's Republic of China
| | - Hao Wu
- Sichuan Shale Gas Exploration and Development Co. Ltd, Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610065, People's Republic of China
| | - Shan Li
- Sichuan Shale Gas Exploration and Development Co. Ltd, Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610065, People's Republic of China
| | - Lijia Wang
- Sichuan Shale Gas Exploration and Development Co. Ltd, Petrochina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610065, People's Republic of China
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Jiang W, Lv W, Jia N, Lu X, Wang L, Wang K, Mei Y. Study on the Effects of Wettability and Pressure in Shale Matrix Nanopore Imbibition during Shut-in Process by Molecular Dynamics Simulations. Molecules 2024; 29:1112. [PMID: 38474624 DOI: 10.3390/molecules29051112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 02/18/2024] [Accepted: 02/27/2024] [Indexed: 03/14/2024] Open
Abstract
Shut-in after fracturing is generally adopted for wells in shale oil reservoirs, and imbibition occurring in matrix nanopores has been proven as an effective way to improve recovery. In this research, a molecular dynamics (MD) simulation was used to investigate the effects of wettability and pressure on nanopore imbibition during shut-in for a typical shale reservoir, Jimsar. The results indicate that the microscopic advancement mechanism of the imbibition front is the competitive adsorption between "interfacial water molecules" at the imbibition front and "adsorbed oil molecules" on the pore wall. The essence of spontaneous imbibition involves the adsorption and aggregation of water molecules onto the hydroxyl groups on the pore wall. The flow characteristics of shale oil suggest that the overall push of the injected water to the oil phase is the main reason for the displacement of adsorbed oil molecules. Thus, shale oil, especially the heavy hydrocarbon component in the adsorbed layer, tends to slip on the walls. However, the weak slip ability of heavy components on the wall surface is an important reason that restricts the displacement efficiency of shale oil during spontaneous imbibition. The effectiveness of spontaneous imbibition is strongly dependent on the hydrophilicity of the matrix pore's wall. The better hydrophilicity of the matrix pore wall facilitates higher levels of adsorption and accumulation of water molecules on the pore wall and requires less time for "interfacial water molecules" to compete with adsorbed oil molecules. During the forced imbibition process, the pressure difference acts on both the bulk oil and the boundary adsorption oil, but mainly on the bulk oil, which leads to the occurrence of wetting hysteresis. Meanwhile, shale oil still existing in the pore always maintains a good, stratified adsorption structure. Because of the wetting hysteresis phenomenon, as the pressure difference increases, the imbibition effect gradually increases, but the actual capillary pressure gradually decreases and there is a loss in the imbibition velocity relative to the theoretical value. Simultaneously, the decline in hydrophilicity further weakens the synergistic effect on the imbibition of the pressure difference because of the more pronounced wetting hysteresis. Thus, selecting an appropriate well pressure enables cost savings and maximizes the utilization of the formation's natural power for enhanced oil recovery (EOR).
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Affiliation(s)
- Wen Jiang
- College of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
- Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China
- Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
| | - Weifeng Lv
- Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China
- Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
- State Key Laboratory of Enhanced Oil and Gas Recovery, Beijing 100083, China
| | - Ninghong Jia
- Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
- State Key Laboratory of Enhanced Oil and Gas Recovery, Beijing 100083, China
| | - Xiaoqing Lu
- School of Materials Science and Engineering, China University of Petroleum, Qingdao 266580, China
| | - Lu Wang
- School of Materials Science and Engineering, China University of Petroleum, Qingdao 266580, China
| | - Kai Wang
- College of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
- Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China
- Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
| | - Yuhao Mei
- College of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
- Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China
- Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
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Research of a novel fracturing-production integral fluid based on cationic surfactant. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Liu W, He H, Yuan F, Liu H, Zhao F, Liu H, Luo G. Influence of the Injection Scheme on the Enhanced Oil Recovery Ability of Heterogeneous Phase Combination Flooding in Mature Waterflooded Reservoirs. ACS OMEGA 2022; 7:23511-23520. [PMID: 35847246 PMCID: PMC9281330 DOI: 10.1021/acsomega.2c02007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
With the maturity of waterflooded reservoirs, owing to serious heterogeneity, the fluid will channel through the thief zone, leading to considerable remaining oil unrecovered in the upswept area. To further enhance oil recovery (EOR) after waterflooding, the heterogeneous phase combination flooding (HPCF) was composed of a polymer, branched-preformed particle gel (B-PPG), and surfactant. For the sake of improving the economic efficiency, the influence of the injection scheme on the EOR of HPCF with an equal chemical agent cost was investigated by sand-pack flooding experiments. Then, visual plate sand-pack model flooding experiments were performed to study the swept area of HPCF under different injection schemes. Results demonstrated that the total EOR of HPCF under different injection schemes ranged from 33.5 to 39.3%. Moreover, the EOR of HPCF under the alternation injection (AI) scheme was the highest, followed by the concentration step change injection (CI) scheme, and that of the simultaneous injection (SI) scheme was the least. The visual flooding experimental results showed that the swept area of HPCF after waterflooding under the AI scheme was higher than that of the SI. Moreover, in view of qualitative analysis of remaining oil distribution, the EOR of AI of HPCF was higher than that of SI, which was consistent with the parallel sand-pack flooding results.
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Affiliation(s)
- Wenzheng Liu
- College
of Petroleum Engineering, Yangtze University, Wuhan 430100, China
- Key
Laboratory of Drilling and Production Engineering for Oil and Gas, Hubei Province, Wuhan 430100, China
| | - Hong He
- College
of Petroleum Engineering, Yangtze University, Wuhan 430100, China
- Key
Laboratory of Drilling and Production Engineering for Oil and Gas, Hubei Province, Wuhan 430100, China
| | - Fuqing Yuan
- Research
Institute of Exploration and Development of Shengli Oilfield, SINOPEC, Dongying 257000, China
| | - Haocheng Liu
- Hekou
Oil Production Plant of Shengli Oilfield, Dongying 257000, China
| | - Fangjian Zhao
- Research
Institute of Exploration and Development of Shengli Oilfield, SINOPEC, Dongying 257000, China
| | - Huan Liu
- College
of Petroleum Engineering, Yangtze University, Wuhan 430100, China
- Key
Laboratory of Drilling and Production Engineering for Oil and Gas, Hubei Province, Wuhan 430100, China
| | - Guangjie Luo
- College
of Petroleum Engineering, Yangtze University, Wuhan 430100, China
- Key
Laboratory of Drilling and Production Engineering for Oil and Gas, Hubei Province, Wuhan 430100, China
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6
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Zhao M, Guo X, Wu Y, Dai C, Gao M, Yan R, Cheng Y, Li Y, Song X, Wang X, Chen Z. Development, performance evaluation and enhanced oil recovery regulations of a zwitterionic viscoelastic surfactant fracturing-flooding system. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Shaikh A, Dai C, Sun Y, Foutou V, Zhao M, You Q, Zhao G, Sun X, Ding X, Bakhsh A, Liu J. Formation and rheology of CO 2-responsive anionic wormlike micelles based clear fracturing fluid system. J DISPER SCI TECHNOL 2021. [DOI: 10.1080/01932691.2021.1974472] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Azizullah Shaikh
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, China
- Engineering and Management Sciences, Balochistan University of Information Technology, Quetta, Balochistan, Pakistan
| | - Caili Dai
- Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao, China
| | - Yongpeng Sun
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, China
| | - Varel Foutou
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, China
| | - Mingwei Zhao
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, China
| | - Qing You
- China University of Geosciences, Beijing, China
| | - Guang Zhao
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, China
| | - Xin Sun
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, China
| | - Xingxing Ding
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, China
| | - Allah Bakhsh
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, China
- Engineering and Management Sciences, Balochistan University of Information Technology, Quetta, Balochistan, Pakistan
| | - Jiawei Liu
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, China
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8
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Design of facile technology for the efficient removal of hydroxypropyl guar gum from fracturing fluid. PLoS One 2021; 16:e0247948. [PMID: 33661981 PMCID: PMC7932517 DOI: 10.1371/journal.pone.0247948] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 02/16/2021] [Indexed: 11/23/2022] Open
Abstract
With the increasing demand for energy, fracturing technology is widely used in oilfield operations over the last decades. Typically, fracturing fluids contain various additives such as cross linkers, thickeners and proppants, and so forth, which makes it possess the properties of considerably complicated components and difficult processing procedure. There are still some difficult points needing to be explored and resolved in the hydroxypropyl guar gum (HPG) removal process, e.g., high viscosity and removal of macromolecular organic compounds. Our works provided a facile and economical HPG removal technology for fracturing fluids by designing a series of processes including gel-breaking, coagulation and precipitation according to the diffusion double layer theory. After this treatment process, the fracturing fluid can meet the requirements of reinjection, and the whole process was environment friendly without secondary pollution characteristics. In this work, the fracturing fluid were characterized by scanning electron microscopy (SEM), Energy dispersive X-ray (EDX), X-ray diffraction (XRD) and Fourier transformed infrared (FTIR) spectroscopy technologies, etc. Further, the micro-stabilization and destabilization mechanisms of HPG in fracturing fluid were carefully investigated. This study maybe opens up new perspective for HPG removal technologies, exhibiting a low cost and strong applicability in both fundamental research and practical applications.
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9
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Wang P, Kang W, Tian S, Yin X, Zhao Y, Hou X, Zhang X, Yang H. A responsive anionic wormlike micelle using pH-directed release of stored sodium based on polybasic acids. SOFT MATTER 2018; 14:5031-5038. [PMID: 29862407 DOI: 10.1039/c8sm00944a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Responsive wormlike micelles are very useful in a number of applications, whereas it is still challenging to create dramatic viscosity changes in anionic surfactant systems. Here a differential pH-responsive wormlike micelle based on sulfonic surfactants was developed, which is formed by mixing sodium dodecyl trioxyethylene sulphate (SDES) and ethylenediaminetetraacetic acid tetrasodium (EDTA4-·4Na+) at the molar ratio of 1 : 1. The phase behavior, aggregate microstructure and viscoelasticity of the SDES/EDTA4-·4Na+ solution were investigated via macroscopic observation, cryo-TEM and rheological measurements. It was found that the phase behavior of the SDES/EDTA4-·4Na+ solution undergoes transitions from a water-like fluid to viscoelastic upon decreasing the pH. On decreasing the pH from 12.01 to 3.27 by adding HCl, the viscosity of the transparent solutions with wormlike micelles was increased rapidly and reached ∼3100 mPa s. Furthermore, on increasing the pH by adding NaOH, the viscosity was slightly increased due to the addition of Na+. However, the increase in the concentration of Na+ is much smaller than the theoretical addition. The same phenomenon was noted in the sodium citrate solution, but does not exist in the sodium formate system. The viscosity of the micellar solution has a sensitive response to inorganic acids and tolerance to inorganic bases due to the characteristics of polybasic acids.
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Affiliation(s)
- Pengxiang Wang
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, P. R. China.
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10
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Wang P, Kang W, Yang H, Zhao Y, Yin X, Zhu Z, Zhang X. The N-allyl substituted effect on wormlike micelles and salt tolerance of a C 22-tailed cationic surfactant. SOFT MATTER 2017; 13:7425-7432. [PMID: 28967008 DOI: 10.1039/c7sm01322a] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Wormlike micelles (WLMs) have been observed in a wide variety of cationic surfactants. Here we developed WLMs based on an N-allyl substituted cationic surfactant with an unsaturated C22-tail, N-erucamidopropyl-N,N-dimethyl-N-allyl-ammonium bromide (EDAA), and compared them with UC22AMPM at the same concentration. The viscoelasticity, aggregate microstructure and salt tolerance of EDAA solutions were investigated by rheology, surface tension and Cryo-TEM measurements. It was found that EDAA exhibited a higher viscosity and a high salt tolerance. Upon increasing the concentration of NaCl, the viscosity of wormlike micelles in the solutions continuously increased and reached ∼1.10 × 106 mP s at 200 mM. On further increasing the NaCl concentration to 2000 mM, the viscosity remained at ∼106 mP s without any reduction. But the viscosity of UC22AMPM solutions showed a drastic change with the increase of NaCl concentration. This drastic variation in rheological behavior is attributed to the presence of the N-allyl substituent. Besides, the EDAA also shows some advantages such as low overlapping concentration(∼2.2 mM) and stable viscosity over the whole pH range.
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Affiliation(s)
- Pengxiang Wang
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, P. R. China.
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11
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Kang W, Wang P, Fan H, Yang H, Dai C, Yin X, Zhao Y, Guo S. A pH-responsive wormlike micellar system of a noncovalent interaction-based surfactant with a tunable molecular structure. SOFT MATTER 2017; 13:1182-1189. [PMID: 28098315 DOI: 10.1039/c6sm02655a] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Responsive wormlike micelles are very useful in a number of applications, whereas it is still challenging to create dramatic viscosity changes in wormlike micellar systems. Here we developed a pH-responsive wormlike micellar system based on a noncovalent constructed surfactant, which is formed by the complexation of N-erucamidopropyl-N,N-dimethylamine (UC22AMPM) and citric acid at the molar ratio of 3 : 1 (EACA). The phase behavior, aggregate microstructure and viscoelasticity of EACA solutions were investigated by macroscopic appearance observation, rheological and cryo-TEM measurements. It was found that the phase behavior of EACA solutions undergoes transition from transparent viscoelastic fluids to opalescent solutions and then phase separation with white floaters upon increasing the pH. Upon increasing the pH from 2.03 to 6.17, the viscosity of wormlike micelles in the transparent solutions continuously increased and reached ∼683 000 mPa s at pH 6.17. As the pH was adjusted to 7.31, the opalescent solution shows a water-like flowing behaviour and the η0 rapidly declines to ∼1 mPa s. Thus, dramatic viscosity changes of about 6 magnitudes can be triggered by varying the pH values without any deterioration of the EACA system. This drastic variation in rheological behavior is attributed to the pH dependent interaction between UC22AMPM and citric acid. Furthermore, the dependence on concentration and temperature of the rheological behavior of EACA solutions was also studied to assist in obtaining the desired pH-responsive viscosity changes.
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Affiliation(s)
- Wanli Kang
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China. and EOR Research Institute, China University of Petroleum (Beijing), Beijing 102249, P. R. China
| | - Pengxiang Wang
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
| | - Haiming Fan
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
| | - Hongbin Yang
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
| | - Caili Dai
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
| | - Xia Yin
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
| | - Yilu Zhao
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
| | - Shujun Guo
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
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12
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Wang P, Kang W, Yang H, Yin X, Zhao Y, Zhu Z, Zhang X. pH-Responsive wormlike micelles based on microstructural transition in a C22-tailed cationic surfactant–aromatic dibasic acid system. RSC Adv 2017. [DOI: 10.1039/c7ra07000d] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
pH-Responsive wormlike micelles based on microstructural transition have been developed by a C22-tailed cationic surfactant and aromatic dibasic acid.
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Affiliation(s)
- Pengxiang Wang
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao 266580
- P. R. China
| | - Wanli Kang
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao 266580
- P. R. China
| | - Hongbin Yang
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao 266580
- P. R. China
| | - Xia Yin
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao 266580
- P. R. China
| | - Yilu Zhao
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao 266580
- P. R. China
| | - Zhou Zhu
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao 266580
- P. R. China
| | - Xiangfeng Zhang
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao 266580
- P. R. China
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13
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Wang K, Liu C, Zhou W. Investigation on the interfacial properties of a viscoelastic-based surfactant as an oil displacement agent recovered from fracturing flowback fluid. RSC Adv 2016. [DOI: 10.1039/c6ra03530b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The utilization of a viscoelastic-based surfactant recovered from fracturing flowback fluid in chemical flooding was investigated in this paper.
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Affiliation(s)
- Kai Wang
- China National Offshore Oil Corporation Research Institute
- Beijing
- People's Republic of China
- State Key Laboratory of Offshore Oil Exploitation
- Beijing
| | - Chen Liu
- China National Offshore Oil Corporation Research Institute
- Beijing
- People's Republic of China
- State Key Laboratory of Offshore Oil Exploitation
- Beijing
| | - Wensheng Zhou
- China National Offshore Oil Corporation Research Institute
- Beijing
- People's Republic of China
- State Key Laboratory of Offshore Oil Exploitation
- Beijing
| |
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