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Proppant transport in rough fracture networks using supercritical CO2 Pet. Sci. (IF 5.6) Pub Date : 2024-03-29 Yong Zheng, Meng-Meng Zhou, Ergun Kuru, Bin Wang, Jun Ni, Bing Yang, Ke Hu, Hai Huang, Hai-Zhu Wang
Proppant transport within fractures is one of the most critical tasks in oil, gas and geothermal reservoir stimulation, as it largely determines the ultimate performance of the operating well. Proppant transport in rough fracture networks is still a relatively new area of research and the associated transport mechanisms are still unclear. In this study, representative parameters of rough fracture surfaces
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Morphological complexity and azimuthal disorder of evolving pore space in low-maturity oil shale during in-situ thermal upgrading and impacts on permeability Pet. Sci. (IF 5.6) Pub Date : 2024-03-28 Jun Liu, Yan-Bin Yao, Derek Elsworth
In-situ thermal upgrading is used to tune the pore system in low-maturity oil shales. We introduce fractal dimension (), form factor () and stochastic entropy () to quantify the heating-induced evolution of pore morphological complexity and azimuthal disorder and develop a model to estimate the impact on seepage capacity via permeability. Experiments are conducted under recreated in-situ temperatures
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Syntheses and properties of associative acrylamide copolymers containing short hydrophobic chains used in a friction reducer for slick-water fracturing Pet. Sci. (IF 5.6) Pub Date : 2024-03-26 Ya-Xing Dai, Xian-Li Zhang, Si-Yuan Liu, Feng-Run-Ze Zhang, Yi-Xi Zhang, Yu-Tong Sang, Jing-Xi Zheng, Zhao-Sheng Liu, Peng Zhang
Two allyldimethylalkyl quaternary ammonium salt (AQAS) monomers, ,-dimethylallylphenylpropylammonium bromide (AQAS1) and ,-dimethylallylnonylammonium bromide (AQAS2), were synthesized and used to prepare modified polyacrylamide materials. Two new drag reducers were synthesized from acrylamide (AM), sodium acrylate (NaAA) and a cationic modified monomer (AQAS1 or AQAS2) via aqueous solution polymerization
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Supramolecular polymer-based gel fracturing fluid with a double network applied in ultra-deep hydraulic fracturing Pet. Sci. (IF 5.6) Pub Date : 2024-03-22 Yong-Ping Huang, Yong Hu, Chang-Long Liu, Yi-Ning Wu, Chen-Wei Zou, Li-Yuan Zhang, Ming-Wei Zhao, Cai-Li Dai
A gel based on polyacrylamide, exhibiting delayed crosslinking characteristics, emerges as the preferred solution for mitigating degradation under conditions of high temperature and extended shear in ultralong wellbores. High viscosity/viscoelasticity of the fracturing fluid was required to maintain excellent proppant suspension properties before gelling. Taking into account both the cost and the potential
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Effect of low-speed waterjet pressure on the rock-breaking performance of unsubmerged cavitating abrasive waterjet Pet. Sci. (IF 5.6) Pub Date : 2024-03-20 Chen-Xing Fan, Deng Li, Yong Kang, Hai-Tao Zhang
Unsubmerged cavitating abrasive waterjet (UCAWJ) has been shown to artificially create a submerged environment that produces shear cavitation, which effectively enhances rock-breaking performance. The shear cavitation generation and collapse intensity depend on the pressure difference between the intermediate high-speed abrasive waterjet and the coaxial low-speed waterjet. However, the effect of the
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Application of sparse S transform network with knowledge distillation in seismic attenuation delineation Pet. Sci. (IF 5.6) Pub Date : 2024-03-19 Naihao Liu, Yuxin Zhang, Yang Yang, Rongchang Liu, Jinghuai Gao, Nan Zhang
Time-frequency analysis is a successfully used tool for analyzing the local features of seismic data. However, it suffers from several inevitable limitations, such as the restricted time-frequency resolution, the difficulty in selecting parameters, and the low computational efficiency. Inspired by deep learning, we suggest a deep learning-based workflow for seismic time-frequency analysis. The sparse
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Hole cleaning evaluation and installation spacing optimization of cuttings bed remover in extended-reach drilling Pet. Sci. (IF 5.6) Pub Date : 2024-03-16 Shuo Peng, Wen-Jun Huang, De-Li Gao
In extended-reach or long-horizontal drilling, cuttings usually deposit at the bottom of the annulus. Once cuttings accumulate to a certain thickness, complex problems such as excessive torque and drag, tubing buckling, and pipe stuck probably occur, which results in a lot of non-productive time and remedial operations. Cuttings bed remover can efficiently destroy deposited cuttings in time through
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Viscoacoustic generalized screen propagator in constant-Q model Pet. Sci. (IF 5.6) Pub Date : 2024-03-15 Zhong-Kui Dai, Jia-Chun You, Xing-Guo Huang, Wei Liu
When seismic waves propagate through the geological formation, there is a significant loss of energy and a decrease in imaging resolution, because of the viscoacoustic properties of subsurface medium. This profoundly impacts seismic wavefield propagation, imaging and interpretation. To accurately image the true structure of subsurface medium, the consensus among geophysicists is to no longer treat
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Sedimentary paleoenvironment and its control on organic matter enrichment in the Mesoproterozoic hydrocarbon source rocks in the Ordos Basin, southern margin of the North China Craton Pet. Sci. (IF 5.6) Pub Date : 2024-03-15 Zhi-Chen Wu, Ju-Ye Shi, Tai-Liang Fan, Ming Jiang
The black shale of the Mesoproterozoic Cuizhuang Formation in the Changcheng System in Yongji city, North China Craton, is a potential source rock. Understanding the organic matter enrichment mechanism is crucial for evaluating source rock resources and understanding oil and gas accumulation mechanisms. In this study, we evaluated the sedimentary paleoenvironment and organic matter enrichment mechanisms
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Prediction and quantification of effective gas source rocks in a lacustrine basin: Western Depression in the Liaohe Subbasin Pet. Sci. (IF 5.6) Pub Date : 2024-03-15 Si-Bo Yang, Mei-Jun Li, Hong Xiao, Fang-Zheng Wang, Guo-Gang Cai, Shuang-Quan Huang
Due to limited data on the geochemical properties of natural gas, estimations are needed for the effective gas source rock in evaluating gas potential. However, the pronounced heterogeneity of mudstones in lacustrine successions complicates the prediction of the presence and geochemical characteristics of gas source rocks. In this paper, the Liaohe Subbasin of Northeast China is used as an example
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Reactive transport modeling constraints on the complex genesis of a lacustrine dolomite reservoir: A case from the Eocene Qaidam Basin Pet. Sci. (IF 5.6) Pub Date : 2024-03-14 Ying Xiong, Bo Liu, Xiu-Cheng Tan, Zheng-Meng Hou, Jia-Shun Luo, Ya-Chen Xie, Kai-Bo Shi, Kun-Yu Wu
Reactive transport modeling (RTM) is an emerging method used to address geological issues in diagenesis research. However, the extrapolation of RTM results to practical reservoir prediction is not sufficiently well understood. This paper presents a case study of the Eocene Qaidam Basin that combines RTM results with petrological and mineralogical evidences. The results show that the Eocene Xiaganchaigou
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New model of linkage evolution for the transtensional fault systems in the Nanpu Sag of Bohai Bay Basin: Insight from seismic interpretation and analogue modelling Pet. Sci. (IF 5.6) Pub Date : 2024-03-11 Yu-Heng Wang, Fu-Sheng Yu, Bao-Yin Zhao, Ling-Jian Meng
The evolution of faults within the same stress field is frequently influenced by numerous factors, involving the reactivation of pre-existing structures, stress transmission through ductile detachment layers, and the growth, interaction, as well as linkage of new fault segments. This study analyses a complex multi-phase oblique extension fault system in the Nanpu Sag (NPS) of the Bohai Bay Basin (BBB)
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Study of inter-well interference in shale gas reservoirs by a robust production data analysis method based on deconvolution Pet. Sci. (IF 5.6) Pub Date : 2024-03-08 Wen-Chao Liu, Cheng-Cheng Qiao, Ping Wang, Wen-Song Huang, Xiang-Wen Kong, Yu-Ping Sun, He-Dong Sun, Yue-Peng Jia
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Paleoenvironmental reconstruction and organic matter accumulation of the paleogene shahejie oil shale in the Zhanhua Sag, Bohai Bay Basin, eastern China Pet. Sci. (IF 5.6) Pub Date : 2024-03-07 Xiao-Lin Wang, Xiao-Min Zhu, Jin Lai, Xing-Yue Lin, Xiang Wang, Yu-Shan Du, Chao Huang, Yu-Rui Zhu
The controlling factors of organic-rich shale accumulation is essential for the exploration and development of shale oil and gas resources. The sedimentary environment plays a vital role in the formation of organic-rich sediments in lacustrine facies. This article unravels the mineralogy, geochemistry, and paleoenvironmental evolution during the deposition of the Paleogene Shahejie Formation (Es).
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Characterization of chemical composition of high viscosity heavy oils: Macroscopic properties, and semi-quantitative analysis of molecular composition using high-resolution mass spectrometry Pet. Sci. (IF 5.6) Pub Date : 2024-03-04 Jian-Xun Wu, Shuo-Fan Li, Qi-Fu Li, Feng Yan, Qi-Lin Zhou, Shuai Ma, Ya-He Zhang, Suo-Qi Zhao, Quan Shi
Heavy oil is an important resource in current petroleum exploitation, and the chemical composition information of heavy oil is crucial for revealing its viscosity-inducing mechanism and solving practical exploitation issues. In this study, the techniques of high-temperature gas chromatography and high-resolution mass spectrometry equipped with an electrospray ionization source were applied to reveal
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Combinatorial reasoning-based abnormal sensor recognition method for subsea production control system Pet. Sci. (IF 5.6) Pub Date : 2024-03-01 Rui Zhang, Bao-Ping Cai, Chao Yang, Yu-Ming Zhou, Yong-Hong Liu, Xin-Yang Qi
The subsea production system is a vital equipment for offshore oil and gas production. The control system is one of the most important parts of it. Collecting and processing the signals of subsea sensors is the only way to judge whether the subsea production control system is normal. However, subsea sensors degrade rapidly due to harsh working environments and long service time. This leads to frequent
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Oilfield analogy and productivity prediction based on machine learning: Field cases in PL oilfield, China Pet. Sci. (IF 5.6) Pub Date : 2024-03-01 Wen-Peng Bai, Shi-Qing Cheng, Xin-Yang Guo, Yang Wang, Qiao Guo, Chao-Dong Tan
In the early time of oilfield development, insufficient production data and unclear understanding of oil production presented a challenge to reservoir engineers in devising effective development plans. To address this challenge, this study proposes a method using data mining technology to search for similar oil fields and predict well productivity. A query system of 135 analogy parameters is established
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Reliability analysis of carbon fiber rod-reinforced umbilical cable under tension using an improved sampling method Pet. Sci. (IF 5.6) Pub Date : 2024-03-01 Yu Zhang, Hong-Yu Zhang, Ran Xia, Siao Jiang, Fang Wang
The umbilical cable is a vital component of subsea production systems that provide power, chemical agents, control signals et al., and its requirement for reliability is exceedingly high. However, as the umbilical cable is a composite structure comprising multiple functional units, the reliability analysis of such cables involves numerous parameters that can impact calculation efficiency. In this paper
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Deep learning CNN-APSO-LSSVM hybrid fusion model for feature optimization and gas-bearing prediction Pet. Sci. (IF 5.6) Pub Date : 2024-02-28 Jiu-Qiang Yang, Nian-Tian Lin, Kai Zhang, Yan Cui, Chao Fu, Dong Zhang
Conventional machine learning (CML) methods have been successfully applied for gas reservoir prediction. Their prediction accuracy largely depends on the quality of the sample data; therefore, feature optimization of the input samples is particularly important. Commonly used feature optimization methods increase the interpretability of gas reservoirs; however, their steps are cumbersome, and the selected
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Analysis of mechanical strengths of extreme line casing joint considering geometric, material, and contact nonlinearities Pet. Sci. (IF 5.6) Pub Date : 2024-02-27 Ji-Yun Zhang, Chi Peng, Jian-Hong Fu, Quan Cao, Yu Su, Jian-Yun Pang, Zi-Qiang Yu
To address the challenges associated with difficult casing running, limited annular space, and poor cementing quality in the completion of ultra-deep wells, the extreme line casing offers an effective solution over conventional casings. However, due to its smaller size, the joint strength of extreme line casing is reduced, which may cause failure when running in the hole. To address this issue, this
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Reshaping force for deformed casing repairing with hydraulic rolling reshaper and its influencing factors Pet. Sci. (IF 5.6) Pub Date : 2024-02-26 Hong-Fei Li, Min Luo, Ting-Ting Xu, Qiao-Zhen Li, Cong-Jian Huang
Hydraulic rolling reshaper is an advanced reshaping tool to solve the problem of casing deformation, which has been widely used in recent years. When it is used for well repair operation, the reshaping force provided by ground devices is generally determined by experience. However, too large reshaping force may destroy the deformed casing, and too small reshaping force may also prolong the construction
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An efficient data-driven global sensitivity analysis method of shale gas production through convolutional neural network Pet. Sci. (IF 5.6) Pub Date : 2024-02-22 Liang Xue, Shuai Xu, Jie Nie, Ji Qin, Jiang-Xia Han, Yue-Tian Liu, Qin-Zhuo Liao
The shale gas development process is complex in terms of its flow mechanisms and the accuracy of the production forecasting is influenced by geological parameters and engineering parameters. Therefore, to quantitatively evaluate the relative importance of model parameters on the production forecasting performance, sensitivity analysis of parameters is required. The parameters are ranked according to
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Influence of tectonic preservation conditions on the nanopore structure of shale reservoir: A case study of Wufeng-Longmaxi Formation shale in western Hubei area, south China Pet. Sci. (IF 5.6) Pub Date : 2024-02-21 Meng Xiang, Shang Xu, Ya-Ru We, Qi-Yang Gou, Bing-Chang Li
Tectonism is one of the dominant factors affecting the shale pore structure. However, the control of shale pore structure by tectonic movements is still controversial, which limits the research progress of shale gas accumulation mechanism in the complex tectonic region of southern China. In this study, 34 samples were collected from two exploratory wells located in different tectonic locations. Diverse
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A molecular insight into coke formation process of vacuum residue in thermal cracking reaction Pet. Sci. (IF 5.6) Pub Date : 2024-02-20 Ji-Guang Li, Xin Guo, Huan-Di Hou
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A novel fracture-cavity reservoir outcrop geological knowledge base construction method considering parameter collection and processing, mutual transformation of data-knowledge, application and update Pet. Sci. (IF 5.6) Pub Date : 2024-02-20 Qi-Qiang Ren, Jin-Liang Gao, Peng Zhu, Meng-Ping Li, Jian-Wei Feng, Qiang Jin, San Zhang
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Experimental investigation on pyrolysis products and pore structure characteristics of organic-rich shale heated by supercritical carbon dioxide Pet. Sci. (IF 5.6) Pub Date : 2024-02-16 Bai-Shuo Liu, Chuan-Jin Yao, Jia-Long Qi, Ya-Qian Liu, Liang Xu, Jing-Xuan Hou
The efficient pyrolysis and conversion of organic matter in organic-rich shale, as well as the effective recovery of pyrolysis shale oil and gas, play a vital role in alleviating energy pressure. The state of carbon dioxide (CO) in the pyrolysis environment of shale reservoirs is the supercritical state. Its unique supercritical fluid properties not only effectively heat organic matter, displace pyrolysis
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Regulating metal-acid double site balance on mesoporous SiO2-Al2O3 composite oxide for supercritical n-decane cracking Pet. Sci. (IF 5.6) Pub Date : 2024-02-15 Liu-Ling Chen, Jun Zhang, Chun-Guang Li, Li-Qun Fei, Bo Wang, Chen-Qi Zhang, Yi Jiao, Jian-Li Wang
The balance between metal and acid sites directly affects the preparation of high-performance cracking catalysts with high heat sink and low coking. Nevertheless, how to control acid-metal sites balance and its relationship with cracking performance are reported scarcely. In this work, a series of Pt/AlO-SiO dual sites catalysts with different metal to acid active sites ratio () were constructed by
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A multi-mechanism numerical simulation model for CO2-EOR and storage in fractured shale oil reservoirs Pet. Sci. (IF 5.6) Pub Date : 2024-02-12 Yuan-Zheng Wang, Ren-Yi Cao, Zhi-Hao Jia, Bin-Yu Wang, Ming Ma, Lin-Song Cheng
Under the policy background and advocacy of carbon capture, utilization, and storage (CCUS), CO-EOR has become a promising direction in the shale oil reservoir industry. The multi-scale pore structure distribution and fracture structure lead to complex multiphase flow, comprehensively considering multiple mechanisms is crucial for development and CO storage in fractured shale reservoirs. In this paper
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A reweighted damped singular spectrum analysis method for robust seismic noise suppression Pet. Sci. (IF 5.6) Pub Date : 2024-02-11 Wei-Lin Huang, Yan-Xin Zhou, Yang Zhou, Wei-Jie Liu, Ji-Dong Li
(Multichannel) Singular spectrum analysis is considered as one of the most effective methods for seismic incoherent noise suppression. It utilizes the low-rank feature of seismic signal and regards the noise suppression as a low-rank reconstruction problem. However, in some cases the seismic geophones receive some erratic disturbances and the amplitudes are dramatically larger than other receivers
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Fractures interaction and propagation mechanism of multi-cluster fracturing on laminated shale oil reservoir Pet. Sci. (IF 5.6) Pub Date : 2024-02-10 Jia-Xin Lv, Bing Hou
The continental shale reservoirs of Jurassic Lianggaoshan Formation in Sichuan Basin contain thin lamina, which is characterized by strong plasticity and developed longitudinal shell limestone interlayer. To improve the production efficiency of reservoirs by multi-cluster fracturing, it is necessary to consider the unbalanced propagation of hydraulic fractures and the penetration effect of fractures
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A micro-crosslinked amphoteric hydrophobic association copolymer as high temperature- and salt-resistance fluid loss reducer for water-based drilling fluids Pet. Sci. (IF 5.6) Pub Date : 2024-02-06 Jian Li, Yu-Xi Ji, Xiao-Xiao Ni, Kai-He Lv, Xian-Bin Huang, Jin-Sheng Sun
During ultradeep oil and gas drilling, fluid loss reducers are highly important for water-based drilling fluids, while preparing high temperature- and salt-resistance fluid loss reducers with excellent rheology and filtration performance remains a challenge. Herein, a micro-crosslinked amphoteric hydrophobic association copolymer (i.e., DADC) was synthesized using N,N-dimethyl acrylamide, diallyl dimethyl
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Overview of computation strategies on the dispersion analysis for explicit finite difference solution of acoustic wave equation Pet. Sci. (IF 5.6) Pub Date : 2024-02-06 Jian-Ping Huang, Wei-Ting Peng, Ji-Dong Yang, Lu-Feng Lou
Finite-difference (FD) method is the most extensively employed numerical modeling technique. Nevertheless, when using the FD method to simulate the seismic wave propagation, the large spatial or temporal sampling interval can lead to dispersion errors and numerical instability. In the FD scheme, the key factor in determining both dispersion errors and stability is the selection of the FD weights. Thus
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Exploring the mechanisms of calcium carbonate deposition on various substrates with implications for effective anti-scaling material selection Pet. Sci. (IF 5.6) Pub Date : 2024-02-05 Lu Gong, Fei-Yi Wu, Ming-Fei Pan, Jun Huang, Hao Zhang, Jing-Li Luo, Hong-Bo Zeng
The unexpected scaling phenomena have resulted in significant damages to the oil and gas industries, leading to issues such as heat exchanger failures and pipeline clogging. It is of practical and fundamental importance to understand the scaling mechanisms and develop efficient anti-scaling strategies. However, the underlying surface interaction mechanisms of scalants (e.g., calcite) with various substrates
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A novel dandelion-based bionic proppant and its transportation mechanism in different types of fractures Pet. Sci. (IF 5.6) Pub Date : 2024-02-05 Jun Li, Ming-Yi Wu, Xu Han, Si-Yuan He, Ze-Yu Lin
Low-permeability reservoirs are generally characterized by low porosity and low permeability. Obtaining high production using the traditional method is technologically challenging because it yields a low reservoir recovery factor. In recent years, hydraulic fracturing technology is widely applied for efficiently exploiting and developing low-permeability reservoirs using a low-viscosity fluid as a
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An Analytical model to estimate the time delay to reach spontaneous ignition considering heat loss in oil reservoirs Pet. Sci. (IF 5.6) Pub Date : 2024-02-05 J. Sheng, E. Yang
During air injection into an oil reservoir, an oxidation reaction generates some heat to raise the reservoir temperature. When the reservoir temperature reaches an ignition temperature, spontaneous ignition occurs. There is a time delay from the injection to ignition. There are mixed results regarding the feasibility of spontaneous ignition in real-field projects and in laboratory experiments. No analytical
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Performance and enhanced oil recovery efficiency of an acid-resistant polymer microspheres of anti-CO2 channeling in low-permeability reservoirs Pet. Sci. (IF 5.6) Pub Date : 2024-02-04 Hai-Zhuang Jiang, Hong-Bin Yang, Ruo-Sheng Pan, Zhen-Yu Ren, Wan-Li Kang, Jun-Yi Zhang, Shi-Long Pan, Bauyrzhan Sarsenbekuly
CO flooding is a vital development method for enhanced oil recovery in low-permeability reservoirs. However, micro-fractures are developed in low-permeability reservoirs, which are essential oil flow channels but can also cause severe CO gas channeling problems. Therefore, anti-gas channeling is a necessary measure to improve the effect of CO flooding. The kind of anti-gas channeling refers to the
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Securing offshore resources development: A mathematical investigation into gas leakage in long-distance flexible pipes Pet. Sci. (IF 5.6) Pub Date : 2024-02-01 Xiang-An Lu, Liang-Liang Jiang, Jian-Sheng Zhang, Min-Gui Wang
Gas flexible pipes are critical multi-layered equipment for offshore oil and gas development. Under high pressure conditions, small molecular components of natural gas dissolve into the polymer inner liner of the flexible pipes and further diffuse into the annular space, incurring annular pressure build-up and/or production of acidic environment, which poses serious challenges to the structure and
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Exploring the impact of economic growth and energy consumption on SO2 emissions in China based on the Environmental Kuznets Curve hypothesis Pet. Sci. (IF 5.6) Pub Date : 2024-01-30 Bing-Jie Xu, Yi-Fei Shen, Hui Qiao, Zhi Gao
This study aims to analysis the influence of economic growth (EG) and energy consumption (EC) on sulfur dioxide emissions (SE) in China. Accordingly, this study explores the link between EG, EC, and SE for 30 provinces in China over the span of 2000–2019. This study also analyzes cross-sectional dependence tests, panel unit root tests, Westerlund panel cointegration tests, Dumitrescu-Hurlin (D-H) causality
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Impact of volcanism on the formation and hydrocarbon generation of organic-rich shale in the Jiyang Depression, Bohai Bay Basin, China Pet. Sci. (IF 5.6) Pub Date : 2024-01-21 Jia-Hong Gao, Xin-Ping Liang, Zhi-Jun Jin, Quan-You Liu, Chang-Rong Li, Xiao-Wei Huang, Ju-Ye Shi, Peng Li
Globally, most organic-rich shales are deposited with volcanic ash layers. Volcanic ash, a source for many sedimentary basins, can affect the sedimentary water environment, alter the primary productivity, and preserve the organic matter (OM) through physical, chemical, and biological reactions. With an increasing number of breakthroughs in shale oil exploration in the Bohai Bay Basin in recent years
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A multiscale adaptive framework based on convolutional neural network: Application to fluid catalytic cracking product yield prediction Pet. Sci. (IF 5.6) Pub Date : 2024-01-22 Nan Liu, Chun-Meng Zhu, Meng-Xuan Zhang, Xing-Ying Lan
Since chemical processes are highly non-linear and multiscale, it is vital to deeply mine the multiscale coupling relationships embedded in the massive process data for the prediction and anomaly tracing of crucial process parameters and production indicators. While the integrated method of adaptive signal decomposition combined with time series models could effectively predict process variables, it
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Full waveform inversion based on hybrid gradient Pet. Sci. (IF 5.6) Pub Date : 2024-01-20 Chuang Xie, Zhi-Liang Qin, Jian-Hua Wang, Peng Song, Heng-Guang Shen, Sheng-Qi Yu, Ben-Jun Ma, Xue-Qin Liu
The low-wavenumber components in the gradient of full waveform inversion (FWI) play a vital role in the stability of the inversion. However, when FWI is implemented in some high frequencies and current models are not far away from the real velocity model, an excessive number of low-wavenumber components in the gradient will also reduce the convergence rate and inversion accuracy. To solve this problem
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Analysis of sensitivity to hydrate blockage risk in natural gas gathering pipeline Pet. Sci. (IF 5.6) Pub Date : 2024-01-19 Ao-Yang Zhang, Meng Cai, Na Wei, Hai-Tao Li, Chao Zhang, Jun Pei, Xin-Wei Wang
During the operational process of natural gas gathering and transmission pipelines, the formation of hydrates is highly probable, leading to uncontrolled movement and aggregation of hydrates. The continuous migration and accumulation of hydrates further contribute to the obstruction of natural gas pipelines, resulting in production reduction, shutdowns, and pressure build-ups. Consequently, a cascade
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The impact of heterogeneity and pore network characteristics on single and multi-phase fluid propagation in complex porous media: An X-ray computed tomography study Pet. Sci. (IF 5.6) Pub Date : 2024-01-20 Shohreh Iraji, Tales Rodrigues De Almeida, Eddy Ruidiaz Munoz, Mateus Basso, Alexandre Campane Vidal
This study investigates the impact of pore network characteristics on fluid flow through complex and heterogeneous porous media, providing insights into the factors affecting fluid propagation in such systems. Specifically, high-resolution or micro X-ray computed tomography (CT) imaging techniques were utilized to examine outcrop stromatolite samples of the Lagoa Salgada, considered flow analogous
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Probing the interaction between asphaltene-wax and its effects on the crystallization behavior of waxes in heavy oil via molecular dynamics simulation Pet. Sci. (IF 5.6) Pub Date : 2024-01-19 Yong Hu, Xi Lu, Hai-Bo Wang, Ji-Chao Fang, Yi-Ning Wu, JianFang Sun
High content of asphaltenes and waxes leads to the high pour point and the poor flowability of heavy oil, which is adverse to its efficient development and its transportation in pipe. Understanding the interaction mechanism between asphaltene-wax is crucial to solve these problems, but it is still unclear. In this paper, molecular dynamics simulation was used to investigate the interaction between
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A robust viscoelastic surfactant tolerating 20% HCl up to 150 °C for oil well stimulation Pet. Sci. (IF 5.6) Pub Date : 2024-01-19 Ji Wang, Ning Qi, Hong-Yao Yin, Yu-Jun Feng
Viscoelastic surfactants (VES) are often used as viscous diverters in acidizing stimulation to prolong the acid consumption time and maximize zonal coverage of the acid for improving well productivity. However, the ceiling temperature of commercial VES cannot exceed 120 °C in practical use because of the poor thermal stability and fragile molecular structure, hindering their implementation in high-temperature
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Inter-layer interference for multi-layered tight gas reservoir in the absence and presence of movable water Pet. Sci. (IF 5.6) Pub Date : 2024-01-11 Tao Zhang, Bin-Rui Wang, Yu-Long Zhao, Lie-Hui Zhang, Xiang-Yang Qiao, Lei Zhang, Jing-Jing Guo, Hung Vo Thanh
Due to the dissimilarity among different producing layers, the influences of inter-layer interference on the production performance of a multi-layer gas reservoir are possible. However, systematic studies of inter-layer interference for tight gas reservoirs are really limited, especially for those reservoirs in the presence of water. In this work, five types of possible inter-layer interferences, including
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Micromechanism and mathematical model of stress sensitivity in tight reservoirs of binary granular medium Pet. Sci. (IF 5.6) Pub Date : 2024-01-12 Jian-Bang Wu, Sheng-Lai Yang, Qiang Li, Kun Yang, Can Huang, Dao-Ping Lv, Wei Zhou
Research on reservoir rock stress sensitivity has traditionally focused on unary granular structures, neglecting the binary nature of real reservoirs, especially tight reservoirs. Understanding the stress-sensitive behavior and mathematical characterization of binary granular media remains a challenging task. In this study, we conducted online-NMR experiments to investigate the permeability and porosity
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Mechanisms of fracture propagation from multi-cluster using a phase field based HMD coupling model in fractured reservoir Pet. Sci. (IF 5.6) Pub Date : 2024-01-09 Yun-Jin Wang, Bo Wang, Hang Su, Tu Chang, Ren-Cheng Dong, Li-Zhe Li, Wei-Yu Tang, Ting-Xue Jiang, Fu-Jian Zhou
Natural fractures (NFs) are common in shale and tight reservoirs, where staged multi-cluster fracturing of horizontal wells is a prevalent technique for reservoir stimulation. While NFs and stress interference are recognized as significant factors affecting hydraulic fracture (HF) propagation, the combined influence of these factors remains poorly understood. To address this knowledge gap, a novel
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Self-adaptive gas flow and phase change behaviors during hydrate exploitation by alternate injection of N2 and CO2 Pet. Sci. (IF 5.6) Pub Date : 2024-01-11 Bo-Jian Cao, Yi-Fei Sun, Hong-Nan Chen, Jin-Rong Zhong, Ming-Long Wang, Ming Wang, Chang-Yu Sun, Guang-Jin Chen
Since hydrate resources play a part of the stratigraphic framework structure in sediments, establishing a safe and economic method for hydrates exploitation remains the primary challenge to this day. Among the proposed methods, the spontaneous displacement of CH from hydrate cages by CO seems to be a perfect mechanism to address gas production and CO storage, especially in today's strong demand for
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Molecular investigation into the transformation of recalcitrant dissolved organic sulfur in refinery sour water during stripping process Pet. Sci. (IF 5.6) Pub Date : 2024-01-10 Yu-Guo Li, Chen He, Chun-Mao Chen, Fan Liu, Quan Shi
Refinery sour water primarily originates from the tops of towers in various units and coker condensate, and cannot be discharged directly to a wastewater treatment plant due to high levels of chemical oxygen demand (COD) and organic sulfur contents. Even after the recovery of HS from the sour water by the stripping process, the effluent still contains a high concentration of dissolved organic sulfur
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Microfacies and diagenetic alteration in a semi-deep to deep lacustrine shale: The Yanchang formation in the Ordos basin, China Pet. Sci. (IF 5.6) Pub Date : 2024-01-08 Bin Bai, Jingyue Hao, Ling Fu, Yuxi Liu, Jianpeng Wang, Lan Wang, Kevin G. Taylor, Lin Ma
The mineralogical development and diagenetic sequence of lacustrine shales in the Chang 7 Member of the Yanchang Formation in the Ordos Basin are detailed studied to predict exploration potential of shale oil in that area. A model of their depositional system and a diagenetic diagram are proposed in this study. Through detailed petrographic, mineralogical, and elemental analyses, four distinct shale
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Linearized waveform inversion for vertical transversely isotropic elastic media: Methodology and multi-parameter crosstalk analysis Pet. Sci. (IF 5.6) Pub Date : 2024-01-08 Ke Chen, Lu Liu, Li-Nan Xu, Fei Hu, Yuan Yang, Jia-Hui Zuo, Le-Le Zhang, Yang Zhao
Seismic migration and inversion are closely related techniques to portray subsurface images and identify hydrocarbon reservoirs. Seismic migration aims at obtaining structural images of subsurface geologic discontinuities. More specifically, seismic migration estimates the reflectivity function (stacked average reflectivity or pre-stack angle-dependent reflectivity) from seismic reflection data. On
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Thickening progression mechanism of silica fume – Oil well cement composite system at high temperatures Pet. Sci. (IF 5.6) Pub Date : 2024-01-05 Hang Zhang, Miao-Miao Hu, Peng-Peng Li, Guo-Qing Liu, Qing-Lu Chang, Jie Cao, Ming Liu, Wen-Hua Xu, Xiu-Jian Xia, Jin-Tang Guo
This work studied the thickening progression mechanism of the silica fume – oil well cement composite system at high temperatures (110–180 °C) in order to provide a theoretical guidance for the rational application of silica fume in the cementing engineering. Results showed that silica fume seldom affected the thickening progression of oil well cement slurry at 110–120 °C, but when temperature reached
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Experimental study on wax deposition of highly paraffinic oil in intermittent gas-oil flow in pipelines Pet. Sci. (IF 5.6) Pub Date : 2024-01-07 Chuan-Shuo Wang, Qian-Li Ma, Xiao-Fang Lv, Jie Zhang, Yang Liu, Shi-Dong Zhou
Oil-gas two phase wax deposition is a fairly common and open-ended question in flow assurance of multiphase transportation pipelines. This paper investigated the two main aspects of oil-gas two phase wax deposition layer: apparent thickness and crystal structure characteristics. A typical highly paraffinic oil in Bohai Sea, China, was used as the experimental material to investigate the wax deposition
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Temperature prediction model in multiphase flow considering phase transition in the drilling operations Pet. Sci. (IF 5.6) Pub Date : 2024-01-06 Yang Zhang, Yong-An Li, Xiang-Wei Kong, Hao Liu, Teng-Fei Sun
The study considers gas compression properties, gas slippage, back pressure (BP), phase transition (PT), well depth, and differences in gas-liquid physical properties. A new temperature model for multiphase flow is proposed by considering phase transition in the drilling process. The mathematical model of multiphase flow is solved using the finite difference method with annulus mesh division for grid
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A hybrid WUDT-NAFnet for simultaneous source data deblending Pet. Sci. (IF 5.6) Pub Date : 2023-12-29 Chao-Fan Ke, Shao-Huan Zu, Jun-Xing Cao, Xu-Dong Jiang, Chao Li, Xing-Ye Liu
Simultaneous source technology, which reduces seismic survey time and improves the quality of seismic data by firing more than one source with a narrow time interval, is compromised by the massive blended interference. Therefore, deblending algorithms have been developed to separate this interference. Recently, deep learning (DL) has been proved its great potential in suppressing the interference.
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The mechanisms of thermal solidification agent promoting steam diversion in heavy oil reservoirs Pet. Sci. (IF 5.6) Pub Date : 2024-01-03 Zhan-Xi Pang, Qian-Hui Wang, Qiang Meng, Bo Wang, Dong Liu
At high cycles of steam huff & puff, oil distribution in reservoirs becomes stronger heterogeneity due to steam channeling. Thermal solidification agent can be used to solve this problem. Its solution is a low-viscosity liquid at normal temperature, but it can be solidified above 80 °C. The plugging degree is up to 99% at 250 °C. The sweep efficiency reaches 59.2%, which is 7.3% higher than pure steam
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Further study on the genesis of lamellar calcite veins in lacustrine black shale - A case study of Paleogene in Dongying depression Pet. Sci. (IF 5.6) Pub Date : 2023-12-30 Guan-Min Wang, Yun-Jiao Zhang, Zi-Yuan Yin, Rui Zhu, Zhi-Yao Hou, Yu Bai
Lamellar calcite veins are prevalent in carbonate-rich, lacustrine dark shale. The formation mechanisms of these veins have been extensively debated, focusing on factors such as timing, depth, material source, and driving forces. This paper examines dark lacustrine shale lamellar calcite veins in the Paleogene strata of Dongying Depression, using various analytical techniques: petrography, isotope
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Evolution of pore systems in low-maturity oil shales during thermal upgrading - Quantified by dynamic SEM and machine learning Pet. Sci. (IF 5.6) Pub Date : 2023-12-30 Jun Liu, Xue Bai, Derek Elsworth
In-situ upgrading by heating is feasible for low-maturity shale oil, where the pore space dynamically evolves. We characterize this response for a heated substrate concurrently imaged by SEM. We systematically follow the evolution of pore quantity, size (length, width and cross-sectional area), orientation, shape (aspect ratio, roundness and solidity) and their anisotropy - interpreted by machine learning