ACS Omega
·
2023
·
IF 4.1
Hongda Hao,Jiaxin Li,Song Deng,Bihua Xian,Zheng Tang,Shuo Yang,Jirui Hou
The high-temperature reservoir (105 °C) in the Liubei block of Jidong Oilfield, with severe longitudinal heterogeneity, has entered a high water-cut stage. After a preliminary profile control, the water management of the oilfield still faces serious water channeling problems. To strengthen water management, N2 foam flooding combined with gel plugging for enhanced oil recovery was studied. In this work, considering a high-temperature reservoir of 105 °C, a composite foam system and starch graft gel system with high temperature resistance were screened out, and displacement experiments in one-dimensional heterogeneous cores were carried out. Through the three-dimensional experimental model and numerical model of a 5-spot well pattern, physical experiments and numerical simulations were carried out respectively to study water control and oil increase. The experimental results showed that the foam composite system had good temperature resistance up to 140 °C and oil resistance up to 50% oil saturation and was helpful to adjust the heterogeneous profile in a high temperature of 105 °C. The starch graft gel system had good injection performance, with a solution viscosity of 18.15 mPa·s, and its gel strength could effectively seal the high-permeability layer, with a gel viscosity of 34950.92 mPa·s. The displacement test results showed that after a preliminary implementation of N2 foam flooding, N2 foam flooding combined with gel plugging could still improve oil recovery by 5.26%. Compared with preliminary N2 foam flooding, gel plugging could control the water channeling in the high-permeability zone near the production wells. The combination of foam and gel made N2 foam flooding and subsequent waterflooding divert to flow mainly along the low-permeability layer, which was conducive to enhance water management and improve oil recovery. This method can be used as an effective technology to manage similar heterogeneous reservoirs.
研究领域:
石油工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Ning Sun,Xue Yao,Zhongzheng Xu,Jiaming Li,Ning Yang,Dongfang Lyu,Guang Zhao,Caili Dai
Foam technology is currently recognized as one of the most promising technical means to further enhance oil recovery. However, the poor stability of foam in harsh reservoirs with high temperatures limits the further application of foam fluids in oil fields. Based on the Pickering emulsion template method, this paper proposed a synthesis strategy for Janus nanographene oxide with aerophilic/hydrophilic characteristics as a novel foam stabilizer. A high-stability foam reinforced by Janus nanographene oxide was constructed. In addition, this paper clarified the relationship between foam stability and the interfacial characteristics of foam and revealed the probable mechanism by which Janus nanographene oxide enhances foam stability. The results showed that the synthesized Janus nanographene oxide has a typical two-dimensional lamellar structure with an obvious asymmetric characteristic. The negatively charged Janus nanographene oxide showed a small particle size, high ζ potential , high thermal stability, satisfactory amphiphilicity, and high interfacial adsorption, which was beneficial for enhancing foam stability at high temperatures. The foam stability was positively correlated with the interfacial viscoelastic modulus of the foam. Janus nanographene oxide was irreversibly adsorbed onto the gas–liquid interface, which increased the interfacial viscoelastic modulus, especially the interfacial elastic modulus increased from 2.94 mN·m −1 to 16.21 mN·m −1 . As a result, the ability of the foam to resist deformation due to external forces was enhanced, which can be reflected in the enhancement of the foam stability. The half-life of foam at high temperature increased from 26 min to 49 min. An appropriate amount of Janus nanographene oxide can form a solid-like film with high mechanical strength on the gas–liquid interface and gradually fill the Plateau boundary of the foam. It can not only effectively reduce the drainage rate of the liquid film but also hinder gas diffusion between adjacent bubbles, which delays the further thinning of the film and coarsening behavior of the foam. Therefore, the constructed reinforced foam can be considered as a promising candidate for further enhancing oil recovery in high-temperature reservoirs, especially for steam channeling control. In addition, this work contributes to a better understanding of the mechanism by which Janus nanomaterials can enhance foam stability and provides theoretical guidance for the further application of foam technology.
研究领域:
石油工程
·
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2021
·
IF 4.346
Tianhong Zhao,Sijia Li,Jiawei Chen,Jie Peng,Wushan Sun,Qiongqiong Guo
For high temperature reservoirs, solid particle foaming stabilizers were commonly used to improve the long-term stability of foam because they were not sensitive to temperature and salinity. Solid particles which could only be dispersed in the solution were easy to agglomerate and sink, and as a result, they could reduce the foaming effect. Consequently, it is necessary to modify the solid particles. The modified solid particles have good dispersion in water, moderate wettability, and can be adsorbed on the gas-liquid interface stably, thus improving the stability of the foam. Nano-silica particles are the most common solid particle foaming stabilizer. The amphiphilic chemically modified nano-silica in this topic was introduced by the reaction of 3-aminopropyltriethoxysilane (APTS) and vapor-phase hydrophilic nano-silica to introduce active amino groups and access the long hydrophobic chain and hydrophilic group on the surface of nano-silica through the substitution reaction. Because amphiphilic molecule was connected to the nano silicon dioxide by chemical bonds, modified nanoparticles adsorption in the bubble liquid film, through the introduction of amphiphilic molecules and foaming agent membrane molecular association, on the one hand, “with” tight liquid film, on the other hand, the “pull” boycott particles flocculated sink, granting the bubble stronger stability. The fabricated nanocomposites were comprehensively characterized including various morphological, compositional and structural characterizations with Fourier Transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and foam performance test under different conditions. Results demonstrated that nanometer SiO 2 was successfully modified, and compared with that before modification, modified SiO 2 had appropriate wettability, better temperature resistance, and the half-life of liquid extract at 100 °C was improved by about 5 min. At last, the enhanced oil recovery of tree distinct foam systems was tested by core flood. The recovery rate of the modified SiO 2 foam system can be increased by 19.8%.
研究领域:
石油工程
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材料科学
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界面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 25
·50601
·
IF 3.125
Wenlong Qin,Ruixuan Li,Hanxi Li,Guanfeng Jiang,Guowei Qin,Yang Wang,Jiang Yang
A Fe 3 O 4 nonaparticles coated with acrylamide/2-acrylamido-2-methyl-1-propanesulfonic acid copolymer(Fe 3 O 4 -Polymer NPs) was synthesized by emulsion polymerization. The structure of Fe 3 O 4 -Polymer NPs was then characterized by infrared spectroscopy, thermo-gravimetric analysis, and scanning electron microscopy. Meanwhile, the rheological properties of Fe 3 O 4 -Polymer NPs solution were systematically studied. The results showed that when dosage of hydrophobic Fe 3 O 4 -Oleic NPs is 10%, the synthesized Fe 3 O 4 -Polymer NPs was with the best viscosity enhancement performance, and the maximum saturation magnetization could reach to 20.0 emu/g. The apparent viscosity value of 5000 mg/L magnetic nano-composite solution was 154.6 mPa·s at 30°C. It shows strong viscosity enhancement ability and good temperature performance. Hence, it has great application potential in well stimulation of medium and high temperature oil and gas reservoirs.
研究领域:
材料科学
·
石油工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 47
·
IF 1.866
Wan-Fen Pu,Yang Yang,Cheng-Dong Yuan
Polymer gels have been widely used for water shutoff in mature oil fields. In this paper, polyacrylamide (PAM)–montmorillonite (MMT) nanocomposites (NC) were prepared through in situ intercalative polymerization. Fourier transform infrared spectroscopy and X-ray diffraction were conducted to characterize the prepared PAM/MMT nanocomposites. The gelation performance of poly(ethylene imine) (PEI) crosslinking PAM/MMT nanocomposite gel system (NC/PEI gel system) was systematically investigated by bottle testing and viscosity measurement methods. The results showed that the gelation performance of the NC/PEI gel system was greatly affected by the total dissolved solids, PAM/MMT nanocomposite concentration, and PEI concentration. The NC/PEI gel system exhibited much better thermal stability and gelation performance than the PAM/PEI gel system at the same conditions. The gelation performance after flowing through porous media of the NC/PEI gel system before injection and that of the subsequently injected gel system was different. The gel strength decreased and the gelation time was delayed after the gel system before injection was flowed through porous media. However, the gel strength of the subsequently injected gel system did not decrease, and only the gelation time was delayed after flowing through porous media. This study suggests that the NC/PEI gel system can be used as a potential water-shutoff agent in high-temperature reservoirs. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 44243.
研究领域:
材料科学
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化学工程
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shoufei Lu,Meilong Fu,Yanmin Mi,Guoyou Cui,Xingcai Wu
To address the issues of limited deep migration capacity, low utilization efficiency, and inadequate environmental sustainability of microspheres, a nano-biomass water dispersant was synthesized using surface-modified nanocellulose (12-25 wt%) as the primary component. The dispersant was systematically evaluated for its temperature and salt tolerance, as well as its pore-throat blocking capabilities, under simulated reservoir conditions. Results indicate exceptional stability and swelling behavior in extreme environments. The particle size increased from <100 nm to 1–10 μm within 7 days at 150 °C in simulated formation water (118,913 mg/L), demonstrating long-term stability under hypersaline conditions. Unlike conventional flooding methods, this nano-biomass system introduces an innovative synchronous displacement mechanism. Rather than adjusting first and then flooding, it combines temporary pore-throat blocking with oil displacement, improving the diversion rate in low-permeability zones by 10%. The dispersant also exhibits superior oil-water interfacial activity, achieving an interfacial tension (IFT) of 10 −2 mN/m at a 0.3 wt% concentration through in situ emulsion formation upon contact with crude oil. Field trials in the Chang Qing Oilfield confirmed its adaptability to high-temperature and high-salinity reservoirs. Owing to its unique thermal stability and salinity resistance, this eco-friendly material represents a promising alternative to synthetic polymers for harsh reservoir conditions.
研究领域:
石油工程
·
纳米技术
·
环境科学
·
高分子科学
·
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）