ENERGY & FUELS
·
2024
·
IF 5.2
Xuening WANG,Long HE,Peng XUE,Yachao FENG,Yan HUANG,Xuefeng WANG
In recent years, low-salinity waterflooding and nanofluid flooding have been regarded as the new technologies for enhanced oil recovery and research (EOR). Research on the mechanisms behind the improvement in the recovery rate has garnered significant attention. However, little attention has been given to the mechanism of low-salinity water within the high-salinity range and the synergistic mechanism between low-salinity water and nanoparticles. In the salinity range of 0–22,0,000 mg/L, the interfacial properties of different concentrations of Na+, Mg2+, Ca2+, and SO42– were investigated. The following conclusions were drawn: interfacial tension (IFT) gradually decreased at elevated temperatures, reaching a minimum value of 14.9 mN/m for 2000 mg/L low-salinity water at 60 °C. The contact angle decreased significantly at increased temperatures, reaching a minimum value of 64.8° for the contact angle of 2000 mg/L low-salinity water at 60 °C, indicating water-wet wettability. Electrostatic repulsion was the highest for 5000 mg/L low-salinity water, with a zeta potential value of −12.56 mV. Furthermore, Na+ significantly affected IFT and zeta potential values at low concentrations, while Ca2+ exhibited a more significant effect on wettability at low concentrations. Additionally, when utilizing 2000 mg/L low-salinity water as the dispersion medium for ZrO2 nanoparticles, increasing the particle concentration negatively impacted the stability of the nanofluid. As the temperature increased, IFT decreased, reaching a minimum value of 14.27 mN/m at a concentration of 0.01 wt % at 60 °C. Similarly, as the temperature increased, the contact angle decreased, with nanofluids at a concentration of 0.014 wt %, exhibiting the lowest contact angle of 51° at 60 °C, indicating increased water-wet wettability of the rock surface. This study offered a fundamental understanding of interfacial phenomena involving low-salinity water and nanoparticles, indicating their potential for EOR technology.
研究领域:
石油工程
·
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2025
·Vol. 13
·期 2
·457
·
IF 2.8
Li Wang,Hong He,Hua Wu,Zhi Luo,Zhongchen Gao,Jun Peng,Haixia Yin,Hao Lei
Water flooding is one of the most widely used secondary oil recovery methods for enhanced oil recovery (EOR). However, as a reservoir matures, excessive water production often accompanies oil production. To address this issue, the injection–production coupling technique (IPCT) has been proposed to control water production and improve oil recovery. Despite its practical application, the underlying mechanisms governing the injection–production process remain unclear. To investigate this, a transparent heterogeneous sand pack model and a visualization micro-model were employed to examine the impact of the injection–production mode on oil recovery and to uncover the mechanisms of enhanced oil recovery. The results indicate that, compared to the conventional continuous injection–production mode, both the fluid flow swept area and incremental oil recovery are significantly higher in the IPCT. Sweep efficiency improves by adjusting the injection–production streamlines and displacement directions. Notably, the oil displacement effect in the “stop injection” mode is more effective than in the “reduce injection” mode. These findings suggest that the coupling injection–production mode can efficiently recover residual oil in low permeability zones, thereby enhancing overall oil recovery.
研究领域:
石油工程
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 47
·51416
·
IF 3.125
Wen Ou,Xinjie Luo,Yujun Feng
Polymer or polymer gels have been widely used to control excessive water during oil production by homogenizing injection profile and reducing water cut in the produced fluids. However, the gels used are generally unable to selectively minimize water production, and face the challenge of syneresis of gels under high temperature and high salinity environment. In this work, melamine-formaldehyde sponge was modified with AlCl 3 solution, rendering a transition from hydrophilic to hydrophobic state with a water contact angle of 130° on the surface of the modified product. Filtration results show that mineral oil and water can be selectively separated with the hydrophobically modified sponge powders. Simulated water shutoff experiments demonstrated the blockage efficiency against water was 30% higher than that against oil, and the oil production was increased 7.4% after blocking. The parallel profile control tests confirmed that the fraction flow of high permeable channel decreased about 75%, accompanied with 60% rise of oil recovery factor. These results indicated that such hydrophobic materials can significantly reduce excessive water production, and this work provided a new idea to offer a low-cost hydrophobic material for conformance control and water shutoff during oil production.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2022
·Vol. 47
·期 9
·11793-11805
·
IF 2.807
Lan Lefang,Lu Xiaobin,Zheng Yancheng,Zhang Guoqing,Cheng Zhe
Cationic Gemini surfactants which were synthesized from long carbon chain alkyl tertiary amines and 1,3-dibromopropane, and polyether ammoniums as clay stabilizers which were synthesized by the reaction of polyether ammine (D230) with formic acid and hydrochloric acid, named as D230FA and D230HC, respectively, were used to preclude hydration expansion and migration of clay minerals in low permeability oilfields, hence facilitating the water injection and oil recovery from the tight reservoirs. The surface tension and interfacial tension (IFT) of surfactants, anti-swelling property of clay stabilizers and the injection performance of the composite system were evaluated in this study. The experimental results show that C14-3-C14 has high interfacial activity and solubility, and the composite system of C14-3-C14 and polyether ammonium salt has good clay stability. The anti swelling rate of Na-clay treated by the solution of 1.5% KCl + 0.1% C14-3-C14 after 10 times of washing with distilled water decreased from 72.6% to 28.0%. While 1% D230FA and 1% D230HC mixed with 0.1% C14-3-C14 + 0.5% KCl have the initially anti swelling rates of 72.1% and 68.3%, and the anti swelling rates after flushing with distilled water reach 61.2% and 58.3%, respectively, indicating good anti-swelling durability . Core flooding experiments show that the injection performance of the composite system depends on the contact angle ( θ ) and the surface tension ( γ ), and the composite system contained 1% D230HC with lower value of γ cos θ has better injection performance than that of 1% D230FA. XRD analysis shows the lower interlayer spacing of clay minerals treated with clay stabilizer solution containing polyether ammonium salts.
研究领域:
石油工程
·
表面化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）