RSC Advances
·
2022
·Vol. 12
·期 15
·9077-9086
·
IF 4.036
Quan Hongping,Zhen Xuele,Lu Qiangying,Wang Linyuan,Jiang Silong
Acidizing retarders are used to reduce the reaction rate between hydrochloric acid (HCl) and carbonates to increase the efficiency of acidification of oil and gas wells and increase oil and gas recovery. We synthesized two polymeric acidizing retarders (AR-1 and AR-2) to explore ways to improve the efficiency of this process. Retarder AR-1 is based on acrylamide (AM) and allyl polyethylene glycol (APEG-1000), and retarder AR-2 is composed of AM, APEG-1000, and octadecyl dimethyl allyl ammonium chloride (C-18). The molecular structures of AR-1 and AR-2 were characterized by Fourier transform infrared (FT-IR) and 1H nuclear magnetic resonance (1H-NMR). The retarding performance and acid–rock reaction rates of AR-1 and AR-2 were evaluated, and the experimental results indicated that AR-2 had a better retarding performance than AR-1, and the acid–rock reaction rate of AR-1 was higher than AR-2. This could be because AR-2 with its hydrophobic chains forms a thicker adsorbed film. This was confirmed by X-ray photoelectron spectroscopy (XPS) and adsorption behavior studies. The scanning electron microscope (SEM) images, contact angle, and XPS results showed that both retarders form adsorption films on the surface of rocks, indicating that the introduction of AM and APEG-1000 makes the retarder adsorb on rock surfaces. The introduction of hydrophobic chains for AR-2 enhanced the thickness of adsorbed film, indicating that adding hydrophobic chains to the acidizing retarder significantly improves its retarding performance.
研究领域:
石油工程
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
·
2024
·
IF 2.7
Qiuyun Guan,Xudong Guo,Yali Sun,Xiaoming Liu,Shouqian Zhao
A simple method was developed for the determination of REEs, Zr, Hf, Th and U in ultramafic rocks by inductively coupled plasma-mass spectrometry with a combination of RE and UTEVA extraction resins for their separation and pre-concentration. Ultramafic rocks were digested with HNO 3 -HF-HClO 4 and finally turned into 11 mol l −1 HCl solutions together with H 3 BO 3 to remove insoluble fluorides. The removal of matrix elements was achieved during the loading procedure. Following this, REEs on RE resin, and Zr, Hf, Th and U on UTEVA resin were eluted with 10 ml of 0.24 mol l −1 HCl, with recoveries better than 94.4%. This method was validated using reference materials JP-1, DTS-2B, OKUM, UB-N, MUH-1 and DZΣ-2, and the measurement results for target analytes were comparable to literature values, indicating its applicability to the determination of REEs, Zr, Hf, Th and U at ultra-trace level in ultramafic rocks.
研究领域:
地球化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 10
·1412
·
IF 3.236
Jianrui Zha,Yaoqi Gu,Shuya Wei,Huarui Han,Ankun Wang,Qinglin Ma
Being inspired by nature, a series of experiments was carried out to deposit a calcium oxalate layer on the surface of the stone by the reaction between carbonate rock and oxalate salt. To increase the anti-dissolution properties of the calcium oxalate layer, the use of mixed oxalate solution has been proposed in the literature by two main routes: (1) adding acid agent to ammonium oxalate, which has the advantage of changing the particle structure and reducing layer porosity, and (2) using neutral methyl oxalate solution, which has the advantage of surface coverage due to slowly hydrolysis. In this study, we investigated the sequential application of ammonium oxalate, methyl oxalate, neutral mixed, and calcium acetate acid mixed solution. With this method, calcium carbonate and calcium oxalate solution can react inside the stone to reinforce it. The protective film’s coverage area can then be increased using dimethyl oxalate neutral mixed solution, and the crystal morphology can be modified with calcium oxalate acid mixed solution. The anti-dissolution properties of the coating were investigated using both a custom-designed apparatus and a selective outdoor environment. The coating displayed good acid resistance properties at pH 2–4. After one year of exposure, the coating is firmly bonded with the stone.Keywords:carbonate rock;sequential application;whewellite
研究领域:
地质学
·
文物保护
✓ 已验证
产品关联
DOI
高影响因子
Petroleum Research
·
2025
·
IF 4
Chengxi Deng,Min Chen,Changsong Liu,Yinfeng Xu,Yonghui Du,Hua Dong
Rock surface wettability plays a crucial role in gas flooding for oil recovery. Natural rock surfaces are usually oleophilic, resulting in high flooding resistance and low recovery in gas flooding. This study explores the regulation of the wettability of sandstone rock surfaces by modifying them with 1H,1H,2H,2H-perfluorodecyltrimethoxysilane or its mixtures with hexyltrimethoxysilane to achieve oil contact angles ranging from 0° to 93.2°. Simulated gas flooding experiments, with N 2 as model gas, reveal that reducing the oleophilicity of rock surfaces improves gas flooding efficiency. Compared to the unmodified superoleophilic rocks, the final oil recoveries in the cores with neutral oil wettability significantly increases and the pressure differential for gas flooding significantly decreases. In cases of cores with permeability of 22 mD, 0.88 mD and 0.09 mD, the increases in oil recovery are from 28.5% to 37.5%, from 20.2 to 27.3% and from 9.1% to 15.4%, respectively; and the reductions of pressure differential for gas flooding are from 53 kPa to 41 kPa, from 323 kPa to 272 kPa, from 1054 kPa to 935 kPa, respectively. These results highlight the critical influence of wettability regulation on gas flooding efficiency, offering valuable insights for optimizing oil recovery strategies.
研究领域:
石油工程
·
油藏模拟
·
表面化学
·
提高采收率
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Chengzhen Sun,Mei Liu,Shijing Xu,Shaohua Zhu,Jiazhong Wu,Bofeng Bai
We experimentally study the influence of inorganic salt ions on the wettability of originally oil-wet rock surfaces, formed by adsorbing polar molecules via polar interactions. It is found that the ions can alter the surface to a more water-wet state with a reduction in the water contact angle of about 20° at most. At lower concentrations, the effect of CaCl 2 solutions is more obvious than that of NaCl solutions, and Na 2 SO 4 solutions are more effective than NaCl solutions. Through a series of characterization, underlying mechanisms are revealed as: (1) the octadecylamine protonates at oil–water interface and attracts with the anions, reducing oil–water interfacial tension; (2) the cations are adsorbed on the negatively charged quartz surface, weakening the electronegativity of quartz surface and replacing the adsorbed octadecylamine molecules. Finally, a quantitative theoretical model is established based on the Young equation to predict the dependence of contact angle on the ion concentration.
研究领域:
石油工程
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Ernest Peter Maiki,Renyuan Sun,Shaoran Ren,Ayman Mutahar AlRassas
In this study, we explore the impact of monovalent (NaCl) and divalent (CaCl2) brines, coupled with sodium dodecyl sulfate (SDS) surfactant at varying low concentrations, on the detachment and displacement of oil from sandstone rock surfaces. Employing the sessile drop method and molecular dynamics simulations, we scrutinize the behavior of the brine solutions. Our findings reveal that both low salinity and low-salinity surfactant solutions induce a gradual shift in rock wettability toward a more water-wet state. This wettability transformation is not instantaneous but evolves over time, as observed through meticulous molecular motion analyses. Through contact angle measurements and molecular dynamics simulations, we delve into the molecular motion at subpore and micropore scales on sandstone/quartz surfaces. The adsorption of surface-active agents from the oil to the oil–brine interface results in a reduced interfacial tension, significantly contributing to oil displacement. Notably, low salinity concentrations ranging from 1000 to 10,000 ppm exhibit the lowest contact angles within 30 min across all solutions. However, higher concentrations deviate from this declining trend, especially with divalent ions like Ca2+, which bridge polar molecules onto the rock surface, resulting in an increased oil-wetting state. This research unveils the intricate molecular motions involved in employing low-salinity surfactant solutions for oil detachment from surfaces. Furthermore, it provides valuable insights into the underlying forces driving oil detachment and wettability alteration.
研究领域:
石油工程
·
界面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2025
·
IF 9.4
Si Huang,Kai Liu,Yinping Li,Xilin Shi,Hao Fan,Mingnan Xu,Zirui Jiang,Feiyang Hu,Hongling Ma,Peng Li
The salt cavern flow batteries (SCFBs) system utilizes a saturated NaCl solution as supporting electrolyte, with salt cavern serving as storage location for electrolytes. Unlike conventional flow batteries, where the electrolytes are stored in above-ground tanks made of plastic or metal, the electrolytes in SCFBs directly contact with surrounding rocks and thus face challenges with high temperatures, high pressures, and complex multi-ionic environments. Therefore, understanding the physical and chemical mechanisms of interactions between the surrounding rocks and electrolytes is of prime importance for the electrochemical performance of SCFBs. In this study, the brine and rock cores from a salt mine in Huai'an of China, were used to investigate the interactions. The SCFBs were assembled with N,N,N,2,2,6,6-heptamethylpiperidinyloxy-4-ammonium chloride (TMA-TEMPO) as the catholyte and N,N′-dimethyl-4,4′-bipyridinium dichloride (MV) as the anolyte. The results indicate that the permeability of interlayer samples only increases by one order of magnitude, while the permeability of salt rock samples consistently maintains an order of magnitude of 10 −20 m 2 . Changes in permeability of salt rock and interlayer samples do not affect the tightness of salt caverns. Complex multi-ionic measurements show almost no influence on the redox behaviors of TMA-TEMPO and MV electrolytes, except for a shielding effect of CO 3 2− on TMA-TEMPO. The 0.1–1.5 M TMA-TEMPO/MV SCFBs exhibits a high energy efficiency of 82 % and a low capacity-fade rate of 0.046 %/cycle (0.40 %/day) over 23 days at 40 mA cm −2 . This study provides valuable insights for future site selection and system design of SCFBs systems in China.
研究领域:
能源科学
·
地质学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Geosciences
·
2022
·Vol. 15
·期 8
·1-21
·
IF 0
Oinam Moni,Rajkumar Hemanta Singh,Soibam Ibotombi,Oinam Nishila,Heni Echeni
The Oligocene Barail Group represents a significant lithostratigraphic unit within Paleogene-Neogene successions of northeast India. Integrated sedimentologic and ichnologic analyses along the Old Cachar road, Manipur, have been carried out. Sedimentological investigation reveals a dominance of subarkoses and arkoses, with source rocks being granites, pegmatites, gneiss, and schists, typical of a warm, humid to subhumid palaeoclimate. The ichnofauna points to a depositional environment ranging from upper shoreface through tide-dominated delta front up to the lower shoreface zone, characterized by Teredolites , Glossifungites , Skolithos , Skolithos-Cruziana , and Cruziana ichnofacies. The Barail sequences represent a hyperpycnal-delta-fed sedimentary unit, deposited at the continental margin in the passively rifted western Burma basin which evolved due to magma-poor hyperextension.
研究领域:
地质学
·
沉积学
·
古地理学
·
地球生物学
·
层序地层学
✓ 已验证
DOI
RSC Advances
·
2018
·Vol. 8
·期 15
·7924-7931
·
IF 2.936
Yanling Wang,Yongfei Li,Qian Wang,Qiang Li,Yue Zhang,Lin Yuan
The wettability of a rock’s surface is a vital factor for gas flow and fracturing fluid backflow. As a result of this, novel and effective gas wetting alteration agents are required. In this work, a gas-wetting alteration agent, N,N-bis(perfluorooctyl)imine acetate sodium, was synthesized and characterized by different methods. The wettability of a rock’s surface was evaluated by contact angle and imbibition measurements, the Owens two-liquid method and glass capillary tube rise testing. The results showed that after treatment with 0.5 wt% N,N-bis(perfluorooctyl)imine acetate sodium the contact angles of water and n-hexadecane on the surface of the rock increased from 36° and 0° to 140° and 119°, respectively. The surface free energy rapidly reduced from primeval 72 mN m−1 to 3.4 mN m−1 after treatment with 0.3 wt% N,N-bis(perfluorooctyl)imine acetate sodium. These values agreed with the imbibition measurements and the results of the glass capillary tube rise testing. Moreover, analysis by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that the roughness of the rock surface significantly increased. The above results fully proved that the wettability of the rock surface is altered from its original water-wetting or oil-wetting to gas-wetting. Furthermore, thermal analysis demonstrated that the gas-wetting alteration agent has good thermal stability, which indicates its great potential to be used as a gas-wetting alteration agent for unconventional gas reservoirs under high temperature conditions.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
高影响因子
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
·
2025
·
IF 3.4
Ai-qun Xiao,Pei-pei Zhao,Lu Yin,Bei Xu
A single-column extraction chromatographic purification method for tungsten using the N-benzoyl-N-phenylhydroxylamine (BPHA) resin was investigated in this study. This method greatly simplifies the W purification procedure, and only 10 ml of acid (5 ml 3 mol l -1 HCl-0.1 mol l -1 HF and 5 ml 1 mol l -1 HF) is required to separate W from Ti, Zr, Hf, Ta and other matrix elements. The blank in the separation step was less than 0.1 ng, and the recovery of W was ~ 99%. Six independent digestion measurements of reference materials BHVO-2, BCR-2, RGM-2 and JB-2 yielded μ 182 W values (mean value with intermediate precision, 95% confidence level) of -10.3 ± 4.0 ( n = 6, 2 s )，-1.2 ± 5.3 ( n = 6, 2 s )，-1.4 ± 4.4 ( n = 6, 2 s ) and 0.6 ± 3.8 ( n = 6, 2 s ), respectively, which are in good agreement with the previously reported values.
研究领域:
地球化学
·
分析化学
·
同位素地质学
·
质谱分析
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL GEOLOGY
·
2020
·
IF 3.363
Jing-Jing Fan,Jie Li,Qiang Wang,Le Zhang,Jing Zhang,Xiang-Lan Zeng,Lin Ma,Zi-Long Wang
Recent advances in analytical techniques have achieved high-precision (2σ ≤ 0.06‰) determinations of Mo isotopic ratios in silicate rocks but few such data are as yet available, especially for low-Mo (<50 ppb) rocks such as leucogranites . Here we present two low-blank, double-spike, high-yield, ion-exchange chromatographic methods (single- and two-column) for precise determination of Mo isotopic ratios in low-Mo rock samples (10–500 ppb) using multicollector–inductively coupled plasma–mass spectrometry (MC–ICP–MS). The two-column technique involved AG 1-X8 anion-exchange (100–200 mesh) and BPHA chelatin resins, with the latter also used in the single-column procedure. Two USGS reference materials (basalt BIR-1a and diabase W-2a) were analyzed for quality-control purposes. Their δ 98/95 Mo values determined using the two methods are consistent within uncertainties, and with those determined by previously published methods. We provide the first Mo isotopic data for the reference materials of dunite DTS-2b (USGS), GPt-3 (NRCG) and peridotite WPR-1 (CCRMP). δ 98/95 Mo values for DTS-2b and WPR-1 by using two-column procedure are in good agreement with those obtained by single-column separation. Repeated analyses of these standards indicate a long-term external reproducibility of better than ±0.05‰. However, the δ 98/95 Mo values of GPt-3 show poor reproducibility due to either the sample heterogeneity or existing undigested minerals (e.g., spinel). The methods were applied to leucogranites with low Mo contents of 10–74 ppb from the Himalaya orogen and southern Lhasa terrane of Tibet . The isotopic analyses yielded δ 98/95 Mo values of −0.2‰ to 0.34‰ and −0.41‰ to −0.68‰ (against NIST SRM 3134), respectively, within the range of values for igneous crust. Their contrasting Mo isotopic compositions may indicate compositional diversity in their sources or differences in magma evolution .
研究领域:
地质学
·
地球化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yongsheng Tan,Qi Li,Liang Xu,Chikezie Chimere Onyekwena,Tao Yu,Lifeng Xu
Nanoparticles effectively enhance the CO2 geological storage capacity by altering wettability during CO2–brine–rock interactions, which significantly impacts the CO2 residual trapping and migration in reservoirs. However, the effect of nanoparticles on CO2–brine–rock interactions in carbonate formations is poorly understood. Therefore, in this study, the impact of SiO2 nanoparticles (SNPs) on CO2–brine–rock interactions was evaluated under supercritical CO2 conditions (60 °C and 12 MPa) by analyzing wettability, conducting X-ray diffraction, scanning electron microscopy analyses, measuring weight loss, and performing low-field nuclear magnetic resonance (LFNMR) tests. The results indicated that (a) both CO2–brine–rock interactions and SNPs–CO2–brine–rock interactions can alter the wettability of carbonate rock surfaces from oil-wet to water-wet and that the carbonate rock became more water-wet after SNPs addition; (b) CO2–brine–rock interactions primarily involved the dissolution of calcite in carbonate rocks under acidic conditions, but SNPs–CO2–brine–rock interactions were more intense; (c) based on LFNMR analysis, the pores of the carbonate core in this study were divided into small pores (T2 < 5 ms) and large pores (T2 > 5 ms), with CO2–brine–rock interactions occurring mainly in the large pores of the carbonate cores but with enhanced interactions in small pores; (d) CO2 solubility in solution after CO2–brine–rock interactions increased with increasing pressure and eventually reached equilibrium, and this trend was observed both in the CO2–brine–rock system and the SNPs–CO2–brine–rock system. However, the CO2 solubility in the SNPs–CO2–brine–rock system was greater than that in the CO2–brine–rock system.
研究领域:
地质学
·
环境科学
·
材料科学
✓ 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）