FUEL
·
2025
·
IF 7.5
Songtao Wu,Modi Guan,Xiaohan Wang,Jing Zhang,Yuhang Zhou,Xiu Huang,Bin Pan
Wettability is a pivotal parameter to determine hydrocarbon reserves and production in shale reservoirs, typically characterized quantitatively by shale-oil-brine contact angles. This parameter is a complex function of shale composition, fluid properties, temperature etc. and is therefore very difficult for conventional theoretical methods to predict accurately and efficiently. Therefore, herein machine learning methods [eXtreme gradient boosting (XGBoost) and the Shapley additive explanations (SHAP)] were integrated to predict this parameter and analyze its sensitivity. To make up the shortage of available data in literature (only 162 data points), another 100 data points about shale/mineral-alkane-water contact angles were measured under in-situ reservoir conditions using the sessile droplet method, thus totally 262 data points were used for machine learning. Experimental results showed that shale, quartz, mica and albite became more hydrophilic with increasing temperature from 25 ℃ to 70 ℃, while K-feldspar and dolomite demonstrated the opposite trend; shale-alkane-water contact angle increased from 60° to 149° (thus wettability shifted from water-wet to oil-wet) with increasing TOC content from 1.9 wt% to 10 wt%. The XGBoost model demonstrated superior predictive accuracy than the gradient boosting regressor and support vector machine models (e.g. R 2 is 0.913, 0.876 and 0.623, respectively). The SHAP sensitivity analysis revealed that brine ionic strength, TOC content, calcite content and quartz content were the four most influential factors affecting wettability. This work presents an efficient artificial intelligence method for shale wettability prediction, which is beneficial for hydrocarbon reserves estimation and production in shale reservoirs.
研究领域:
石油工程
·
地质学
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2021
·
IF 2.826
Zhenzhen Yu,Kangle Ding,Chao Han,Yi Wu,Mei Zou,Yan Liu,Fujia Guan
A natural mud shale (MS) from Yichang Area, China was for the first time experimentally examined for its potential application to oily effluents treatment. The mineralogical compositions, surface structures and pore size distribution of the prepared MS particles were characterised using various advanced analytical technologies, respectively. The performance of the MS particles during the model diesel oil wastewater treatment was examined based on the designed adsorption experiments. Isothermal and kinetic features were investigated according to a variety of adsorption models. The results showed that some pores, cavities and fractures were distributed on the surface of MS particles. The efficiency of MS particles for removing diesel oil from the model oily effluent was associated closely with experimental conditions including the mass of MS particles, initial diesel levels, residence time and pH values. Equilibrium adsorption isotherms conformed to Langmuir model, indicating that the adsorption of diesel oil onto MS particles tended to monolayer adsorption. Kinetics of adsorption of diesel oil on MS complied with the pseudo-second-order model. This suggested that the whole oil removal rate was mainly controlled by chemisorption. Results of our study indicates potential utilisation of unmodified MS particles as an abundant and inexpensive adsorbent for low-concentration diesel oil wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MARINE AND PETROLEUM GEOLOGY
·
2021
·
IF 4.348
Wenqing Wang,Chiyang Liu,Wenhui Liu,Xiaofeng Wang,Pei Guo,Jianqiang Wang,Zuodong Wang,Zhongping Li,Dongdong Zhang
Organic-rich shales are generally characterized by high uranium (U) contents. The effects of U irradiation on evolution and hydrocarbon generation of organic matter (OM) have attracted substantial attention. However, details on the generation mechanisms of products and the identification of dominant reactions occurring during OM radiolysis remain understudied. In this study, γ ray was used to irradiate immature kerogen and bitumen, and electron beam was for decane. The contents and carbon (C) isotopic compositions of gaseous products, the liquid products of decane, and the functional groups alterations of kerogens and bitumen were detected. The results showed that, the product generation corresponded well to the structural alteration of OM during radiolysis. C–H and R–CH 3 rupture contributed to H 2 and CH 4 generation, respectively. O-containing group cleavage caused CO 2 generation, and O 2 presence could enhance the oxidation of OM by joining in the structure of OM or by facilitating the formation of new oxides. H 2 O addition could not only provide O, enhancing the oxidation of OM, but could also provide H, thus promoting H 2 generation. We identified cracking, cross-linking, and oxidation reactions during the OM radiolysis. C isotopic composition changes in solid OM could facilitate identification of dominant reactions. Non-closed geological environment of shales promoted the occurrence of cracking reaction. The substantial radiation energy generated from U decay in U-rich shales was significant for OM evolution via decrease in H/C, increasing O/C, and via enhancement of dealkylation, aromatization and unsaturation, which were similar to the thermal effects. Moreover, U irradiation could also promote conventional gas and immature gas generation and could provide exogenous H for hydrocarbon generation of OM, especially for OM in an over mature stage. It is essential to consider the effects of U irradiation on the evolution, hydrocarbon generation, and resources assessment of U-rich shales.
研究领域:
地质学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Li Wang,Jixiang Guo,Yu Zhou,Xiaojun Zhang,Chenhao Gao,Ruiying Xiong,Hanxuan Song,Xiangwei Chen,Junjie Luo
Current oil shale extraction technologies face significant challenges, including high heating costs, slow pyrolysis reaction rates, and low efficiency, which hinder effective resource exploitation. To address these issues, this study synthesized three types of metal-doped carbon quantum dot (M/CQD) catalysts—Co/CQDs, Ni/CQDs, and Mn/CQDs—and tested their effects on the pyrolysis of oil shale. The introduction of these catalysts resulted in a notable enhancement of the pyrolysis process, reducing the required activation energy by approximately 40 % and lowering the initiation temperatures for Co/CQDs, Ni/CQDs, and Mn/CQDs by 64 °C, 62 °C, and 94 °C, respectively. Consequently, the yield of shale oil increased significantly by 23.1 %, 13.3 %, and 19.8 % for each catalyst. Kinetic and product analyses indicate that these catalysts facilitate electron transfer from organic molecules, promoting the formation of free radicals and the cleavage of C–C bonds. This enhancement leads to an increased production of short-chain hydrocarbons and a reduction in oxygenates and esters, thereby improving the quality of the shale oil. Further insights from Density Functional Theory (DFT) calculations suggest that the catalysts enhance pyrolysis by promoting the formation of carbocations and synergizing with radicals released from the shale, intensifying the pyrolysis process. This study not only elucidates the catalytic mechanisms that enhance oil shale pyrolysis but also offers a promising approach to overcome technological challenges in shale resource recovery, such as high heating costs and low efficiency, paving the way for more efficient and cleaner shale oil production.
研究领域:
化学工程
·
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Xuexin Chen,Hui Wang,Baijun Yan
In order to recover vanadium from vanadium-bearing black shale efficiently, a hydrometallurgical process is developed in this paper to treat the concentrate beneficiated from stone coal ore, in which the vanadium mainly occurs in the form of Fe 3- x V x O 4 spinel. At the first step, the leaching behaviors of Fe and V from the concentrate by using sulfuric acid solution are investigated in detail. The extraction rates of vanadium and iron could reach 92.5% and 98.5% respectively under the optimum leaching conditions of leaching temperature of 90 °C, sulfuric acid concentration of 25 wt%, leaching time of 90 min, L/S mass ratio of 30 and stirring speed of 600 rpm. Secondly, the iron impurity in the pregnant solution is removed efficiently by the precipitation method with Fe 2 O 3 as nucleating agent. The effect of pH value, the amount of Fe 2 O 3 nucleating agent and the precipitating time on the removal of iron and losing of vanadium are systematically investigated, and thereby >99.7% iron impurity can be removed with the loss rate of vanadium not higher than 2.5%. Finally, vanadium is precipitated from the purified leach solution as ammonium poly-vanadate by adding ammonium sulfate , and then the product of V 2 O 5 is obtained by calcining the ammonium poly-vanadate. The purity of V 2 O 5 powder can reach 92.0% approximately.
研究领域:
冶金学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Pei Li,Jinchuan Zhang,Reza Rezaee,Wei Dang,Xuan Tang,Haikuan Nie,Shijing Chen
The variation in pore water distribution within gas shale reservoirs has a significant effect on gas content, and thus on resource evaluation. However, the characteristics of water micro-distribution and its effects on pore parameters are still not well understood due to the mixed wettability of shale and the complexity of the pore structure . In this study, six lower Permian transitional shale samples from the southern North China Basin, humidified at four levels up to a relative humidity of 98%, were selected for moisture-equilibrated experiments and low-pressure N 2 gas adsorption measurements. The results indicate that the adsorbed moisture in transitional clay-rich shales can be divided into capillary condensation water in the micropores and monolayer–multilayer adsorbed water in the non-micropores. Moreover, thermal maturity (VR o ), total organic carbon , clay, and carbonate are positively correlated with the adsorbed moisture and micro-/mesopores, indicating that water in shales could be hosted in inorganic pores as well as in organic pores. Furthermore, the distribution of adsorbed moisture is mainly controlled by the VR o , component wettability (i.e., organic matter, clay, pyrite, and carbonate), and pore structure (micro-/mesopore distribution). In addition, a subtle adsorbed moisture may significantly reduce both the pore volume (PV) and specific surface area (SSA) of micropores, and the effect on micropores and SSA is more pronounced than that on the respective non-micropores and PVs. Additionally, the mechanism of clay swelling and pore expansion in clayey shale can provide certain insights for water–methane competitive adsorption, identifying clay type and pore size, and the formation of organo-mineral complexes.
研究领域:
地质学
·
能源科学
✓ 已验证
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Haifeng Jiang,Wenpeng Hong,Yu Zhang,Sunhua Deng,Jie Chen,Chen Yang,Haoshu Ding
In this work, the effects of the coupling between montmorillonite and CoCl 2 ·6H 2 O on pyrolysis behavior, products distribution and characteristics of liquid fuel were investigated by the combination of pyrolysis experiment and kinetic analysis. The mass fraction of the MMT in oil shale was 3–9%, and the mass fraction of CoCl 2 ·6H 2 O was 10–25%. The results showed that the coupling effect promoted the formation of shale oil. The maximum yield of shale oil (17.75 wt%) was obtained at 20CoCl 2 ·6H 2 O5MMT. Catalytic pyrolysis behavior and kinetic analysis indicated that the presence of CoCl 2 ·6H 2 O and montmorillonite led to the prominent advance of kerogen decomposition temperature and the decrease of apparent activation energy. Significantly, the addition of the 20CoCl 2 ·6H 2 O5MMT led that the average apparent activation energy was decreased by about 122.42 kJ/mol compared to the catalyst-free pyrolysis. The strong cracking ability produced by their coupling effect was considered to be the main reason. Montmorillonite and CoCl 2 ·6H 2 O enhanced the decarboxylation and free-radical reaction, resulting in a decrease of acids yield and an increase of aliphatic hydrocarbons yield. The relative content of aliphatic hydrocarbons increased from 41.55% to 51.27%. These results demonstrated that the combined use of montmorillonite and CoCl 2 ·6H 2 O was beneficial to the generation of saturated hydrocarbon production.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Natural Gas Science and Engineering
·
2015
·
IF 2.157
Hanyi Zhong,Zhengsong Qiu,Dong Sun,Daoming Zhang,Weian Huang
Polyetheramines as shale hydration inhibitors in water-based drilling fluids have attracted great interests in recent years. In this paper, in order to clarify the relationship between inhibitive properties and molecular structures of polyetheramines, several inhibitive experimental methods including bentonite inhibition test, shale cuttings hot-rolling dispersion test, sedimentation volume measurement, and API filtration measurement were adopted to evaluate the inhibition variation of different polyetheramines. Furthermore, a series of analytical methods such as surface tension determination, zeta potential measurement, XRD , contact angle measurement , and water adsorption test were performed to identify the relationship between the inhibitive performance and molecular structures. The factors including molecular weight , number of amine group, and molecular chain affecting the interaction between polyetheramines and clay particles were analyzed. Polyetheramine with molecular weight of 230 and oxypropylene segment can reduce the interlayer spacing of the hydrated clay to the minimum and exhibit the best performance in comparison with others. The coordination of electrostatic adsorption with monolayer arrangement, hydrogen bonding, and hydrophobic shielding effect contributed to the top level of inhibition.
研究领域:
石油工程
·
材料化学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Xin Li,Xifan Li,Guijing Chen,Di Zhang,Lun Tian,Jun Chen,Changhui Liu,Bo Li,Alberto Tiraferri,Baicang Liu
To minimize manganese loss during acid leaching and to enhance the lithium adsorption capacity from shale gas wastewater of H 1.33 Mn 1.67 O 4 , this adsorbent material was doped with metallic elements in this study. Doping was achieved using solid-phase synthesis, resulting first in a Li 1.33 R X Mn 1.67−X O 4 (R = Fe, Ni, Al) precursor powder through high-temperature calcination. Then, lithium was leached out under acidic environment to obtain the desired H 1.33 R X Mn 1.67−X O 4 (HMO-R) adsorbents. The equilibrium adsorption capacities of HMO-R powders were measured as 20.7 mg/g, 20.7 mg/g, and 29.0 mg/g, for Fe, Ni, and Al dopants, respectively, surpassing that of the former H 1.33 Mn 1.67 O 4 (13.7 mg/L). Moreover, an average reduction of manganese loss by 30% for HMO-R was observed during lithium recovery/extraction cycles by acid leaching compared to undoped Li 1.33 Mn 1.67 O 4 . Overall, the doped adsorbent exhibited a stable crystal structure and high adsorption capacity, enhanced stability, performance, and efficiency in cycling experiments with respect to the undoped material.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2024
·Vol. 12
·期 12
·2685
·
IF 2.8
Jian Zhu,Fei Wang,Shicheng Zhang,Xinfang Ma
Spontaneous imbibition (SI) effectively enhances oil recovery in shale reservoirs, significantly changing well shut-in and flowback design. This study conducted SI and displacement experiments to simulate the well shut-in and flowback stages so that the mechanism of imbibition and displacement between crude oil and fracture fluid can be discussed. In addition, the relative contribution to oil recovery of different types of pores in various stages and the effect of wettability were determined with low-field nuclear magnetic resonance (LF-NMR) via each sample’s T2transverse relaxation time at each time. The experimental results show that shale has multiscale pore structure characteristics combined with micropores, small mesopores, and mesopores. During the SI process, crude oil is displaced from micropores by fracture fluid at first, and then a large amount of oil production comes from small mesopores. Oil recovery of water-wet core samples is approximately 40.7%. Oil recovery of oil-wet core samples is about 26%. The wettability significantly affects the imbibition and displacement oil recovery of samples. For the process of SI, oil recovered from small mesopores takes the lead in the complete sample recovery. For the displacement process, oil recovered from small mesopores and mesopores take the lead in the complete sample recovery. After displacement, only 12% of fracture fluid flooded from the samples. This research, demonstrating the imbibition and displacement characteristics of terrestrial shale and several relevant affecting factors, contributes to understanding the fracturing fluid retention mechanism in shale reservoirs and provides crucial theoretical foundations for the development of shale oil reservoirs.
研究领域:
石油工程
·
地质学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Xinliang Li,Guancheng Jiang,Lili Yang,Shuanglei Peng
In order to develop a biodegradable and efficient shale inhibitor, gelatin, a biodegradable amino polymer, was introduced as a potential shale inhibitor. The inhibitive properties were evaluated by linear swelling test, hot-rolling recovery test and montmorillonite (MMT) plate soaking test. The results showed that the inhibition of gelatin was better than other common inhibitors. The inhibitive mechanism of gelatin was also investigated via a variety of characterization methods. First of all, gelatin was adsorbed on MMT particles through electrostatic interactions and hydrogen bonds. Then, the negative charge on MMT particles was neutralized and the double electrical layers were suppressed. For the adsorbed gelatin molecules, only a few molecules entered the interlayer space and expelled water. Meanwhile, the main part of gelatin was strongly adsorbed on the surface of MMT particles and formed a polymer film, which made clay surface more hydrophobic. Thus, the polymer formed an effective shield to prevent the invasion of water. Finally, the MMT layers were compressed together in a form of thicker and larger agglomerations and the hydration was well inhibited.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
高影响因子
Water
·
2023
·Vol. 15
·期 3
·439
·
IF 3.4
Yuting Wang,Haoquan Zhang,Ruixue Zhao,Die Wang,Lu Zhou,Le Han
Shale gas wastewater is a hypersaline industrial effluent in demand of efficient treatment or resource recovery. Membrane distillation (MD) is a heat-driven desalination process of high potential to deal with such streams. However, its application is highly limited by the unsatisfactory hydrophobic membranes that involve a trade-off between vapor permeability and fouling/wetting resistance. Our previous studies highlighted the potential role of an intermediate coating layer of a carbon nanotube (CNT) for the superhydrophobic membrane with 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FAS) grafted to address the trade-off issue against synthetic saline oily wastewater. The work herein investigated its application performance in the continuous concentration and water recovery of real shale gas wastewater, with a commercial PVDF membrane as the reference. The modified membrane recycled 48.2% of the total volume as high-quality water and rejected 99% of feed salinity, achieving a superior concentration rate and flux recovery rate compared to PVDF. The value of the COD, total nitrogen, and ammonia nitrogen in the permeate after the modified membrane was less than 50, 20, and 20 mg/L, meeting the local wastewater discharge standard. It was pointed out that the inorganic fouling for the MD membrane was more of a concern in dealing with a real stream, but the modified membrane exhibited excellent fouling resistance. The cost associated with the treatment was estimated at USD 2.2/m3for a production capacity of 2000 m3/d. The proposed superhydrophobic membrane has proven to be a feasible alternative from both technical and economic standpoints, offering the potential to improve MD effluent water quality and mitigate membrane fouling.Keywords:membrane distillation;shale gas wastewater;carbon nanotube;water recovery;membrane fouling
研究领域:
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）