Frontiers in Energy Research
·
2023
·
IF 3.4
Liu Yong,Zhao Fajun,Niu Ruixia,Cao Sheng,Liu Lei,Song Yarui
This study examined an enhanced foam-flooding system incorporating nanoparticles and polymers under geological conditions of a reservoir of the Shu 16 block in the Yushulin oilfield. The system is mainly comprised of an anionic foaming agent (CQS-1) and a nonionic surfactant (FH-1). We screened 17 foams by evaluating their foaming volumes and foam half-lives using a Waring-blender and dynamic foam analysis methods, and nanoparticles were selected after examining each foam’s concentration, the ratio of the main agent to the auxiliary agent, and the dosage of the foam stabilizer. Then, we analyzed the selected system’s microstructure and rheological properties, including the adaptability of the reservoir to its temperature resistance, salt tolerance, and adsorption resistance. As a result, this study supports the field application of CO2 foam flooding.
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
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
FUEL
·
2023
·
IF 7.4
Liping Du,Binfei Li,Teng Lu,Boliang Li,Zhaomin Li,Jiqian Wang
To address problematic low reservoir recovery rates, a new porous SiO 2 aerogel nanosuspension (NS) with emulsifying effects was developed, and its microstructure and flow characteristics were analysed with physical property and rheological tests. Moreover, macro- and microlevel flooding experiments were carried out to explore the mechanism for enhanced oil recovery (EOR). The results showed that the final recovery rates were 58.23% and 60.68% with 0.8 PV NS and NS foam slug, respectively, which were 10.03% and 13.62% higher than those of secondary oil recovery. Oil-water emulsions with different emulsification degrees were generated after sufficiently oscillating the NS and condensate oil mixture. NS flooding exhibited evident nonpiston characteristics in the early stage, and particles were transferred from water into the oil phase, which resulted in differential emulsification of the oil. The oil flow status was altered from flakes to droplets due to emulsification and the changing passage cross-section caused by particle accumulation. With NS foam flooding, the oil was first replaced by coherent large bubbles and then migrated under the effects of multiple systems. A particle circumfluence layer around the foam absorbed oil to generate an adhesive oil film.
研究领域:
石油工程
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材料科学
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流体力学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Xiaomin Liu,Zhao Chen,Zhenggang Cui
Foam flooding can significantly improve the sweep efficiency of gas flooding by avoiding or weakening gas segregation, viscous fingering and gas channeling through areas of high permeability. However, most conventional anionic surfactants are not suitable to be used as foaming agents due to low tolerance to either high salinity or high temperature. In this paper, an anionic-nonionic combined surfactant , fatty alcohol polyoxyethylene (3) ether sulfonate (AEO 3 -HS) was synthesized, and its foaming performances at different conditions were examined. The results show that the foaming performance of the AEO 3 -HS is sensitive to crude oil which behaves as a defoaming agent. But this can be improved by mixing with cetyl dimethyl hydroxypropyl sulfobetaine (C 16 HSB). In mild reservoir conditions such as dissolved in simulated Daqing connate water (45 ℃, total salinity of 6778 mg/L, pH = 8–9) the AEO 3 -HS/C 16 HSB binary mixture at an optimal mole fraction ratio (0.6/0.4) and an optimal total concentration (4 mM) gives the maximum composite foaming index of 1100 Ls by shaking 10 mL solution with 0.25 g oil in a 100 mL cylinder. Moreover, the AEO 3 -HS/C 16 HSB binary mixture is well soluble in brine with 5000 mg/L CaCl 2 + 100,000 mg/L NaCl at 60 °C, and does not hydrolyze in aqueous solution when stored at 90 °C for 3 months. In addition, the AEO 3 -HS and C 16 HSB molecules show attraction in mixed monolayer and the crude oil can be easily emulsified as small oil droplets dispersed in foaming solution during foaming process, which ensures the stabilization of the pseudo-emulsion films and thereby the foam stability in the presence of crude oil. The AEO 3 -HS synthesized is therefore a good candidate as foaming agent for high salinity and high temperature reservoirs.
研究领域:
石油工程
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2021
·Vol. 24
·期 4
·683-696
·
IF 1.902
Xiaomin Liu,Zhao Chen,Zhenggang Cui
In foam flooding, foams stabilized by conventional surfactants are usually unstable in contacting with crude oil, which behaves as a strong defoaming agent. In this article, synergistic effects between different surfactants were utilized to improve foam stability against crude oil. Targeted to reservoir conditions of Daqing crude oil field, China (45 °C, salinity of 6778 mg L −1 , pH = 8–9), foams stabilized by typical anionic surfactants fatty alcohol polyoxyethylene ether sulfate (AES) and sodium dodecyl sulfate (SDS) show low composite foam index (200–500 L s) and low oil tolerance index (0.1–0.2). However, the foam stability can be significantly improved by mixing the anionic surfactant with a sulfobetaine surfactant, which behaves as a foam stabilizer increasing the half-life of foams, and those with longer alkyl chain behave better. As an example, by mixing AES and SDS with hexadecyl dimethyl hydroxypropyl sulfobetaine (C 16 HSB) at a molar fraction of 0.2 (referring to total surfactant, not including water), the maximum composite foaming index and oil tolerance index can be increased to 3000/5000 L s and 1.0/4.0, respectively, at a total concentration between 3 and 5 mM. The attractive interaction between the different surfactants in a mixed monolayer as reflected by the negative β s parameter is responsible for the enhancement of the foam stabilization, which resulted in lower interfacial tensions and therefore negative enter (E), spreading (S), and bridging (B) coefficients of the oil. The oil is then emulsified as tiny droplets dispersed in lamellae, giving very stable pseudoemulsion films inhibiting rupture of the bubble films. This made it possible to utilize typical conventional anionic surfactants as foaming agents in foam flooding.
研究领域:
石油工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2021
·
IF 4.346
Qi Liu,Yusong Zhang,Xuesong Zhao,Hang Ye,Dan Luo
Nanoparticles (NPs) could enhance the stability of foam to allow recovery of greater amounts of residual oil during foam flooding . However, conventional nanoparticles are non-recyclable and affect the quality of the produced oil. Magnetic nanoparticles could respond to magnetic field and be recycled for reuse, thus reducing the cost for enhanced oil recovery (EOR) process and improving the quality of the produced oil. In this study, Fe 3 O 4 nanoparticles were used as foam stabilizer. The Fe 3 O 4 nanoparticles were modified with tetraethyl orthosilicate (TEOS) and n -dodecyltrimethoxysilane (WD-10) to make them hydrophobic. The optimal nanoparticles were Fe 3 O 4 @SiO 2 -700 with a contact angle of 68.5°. Foam was generated by sodium dodecyl sulphate (SDS) surfactant and the longest drainage half-life time was 746 s in the 1 wt% NPs+0.23 wt% SDS+3 wt% NaCl foam system . After evaluating foam stability, the nanoparticles were recycled and reused to stabilize foam again, and the results indicated that recycling nanoparticles three times was optimal. Finally, the core flooding experiments showed that the nanoparticles stabilized foam EOR rate was 17.4% and the system obtained a greater pressure drop to improved sweep area. These results indicated that the magnetic nanoparticles could stabilize foam effectively and could be recycled by magnetic field to reuse in stabilizing foam. This study suggested directions for further studies concerned with the application of magnetic nanoparticles for enhanced oil recovery .
研究领域:
石油工程
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纳米技术
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材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）