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Unlocking the potentials of gel conformance for water shutoff in fractured reservoirs: Favorable attributes of the double network gel for enhancing oil recovery

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Petroleum Science 2023年第2期20卷 1005-1017页

作者： Qian-Hui Wu ji-jiang ge Lei Ding Gui-Cai Zhang School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China Laboratoire Sciences et Ingénierie de la Matière Molle ESPCI ParisPSL University75005ParisFrance Total Energies SE. E&PPôle d’Etudes et Recherche de LacqBP 47LACQ64170France

The double-network prepared with an in-situ monomer gel and a fast-crosslinked Cr(III) gel is introduced to develop a thixotropic and high-strength gel (THSG), which is found to have many advantages over the traditional gels. The THSG gel demonstrates remarkable thermal stability, and no syneresis is observed after 12 months with high salinity brine (95,500 mg/L). Moreover, the SEM and XRD results indicate that the gel is intercalated into the lamellar structures of Na-MMT, where the gel can form a uniform and compact structure. In addition, the THSG gel has an excellent swelling behavior, even in the high salinity brine. In the slim tube experiments, the THSG gel exhibits high rupture pressure and improves blocking capacity after being ruptured. The core flooding results show that a layer of gel filter cake is formed on the face of the fracture, which may be promoted by a high matrix permeability, a small aperture fracture, and a high injection rate. After the gel treatment, the fracture can be completely blocked by the THSG gel. It is found that a high incremental oil recovery (65.3%) can be achieved when the fracture was completely blocked, compared to 40.2% if the gel is ruptured. Although the swelling of ruptured gel can improve oil recovery, part of the injected brine may be channeled through the gel-filled fractures, resulting in a decrease in the sweep efficiency. Therefore, the improved blocking ability by gel swelling (e.g., in fresh water) may be less efficient to contribute to an enhancement of oil recovery. It is also found that the pressure gradient and residual resistance factor to water (Frrw) are higher if the matrix is less permeable, indicating that the fractured reservoir with lower matrix permeability may require a higher gel strength for treatment. The findings of this study may provide novel insights on designing robust double network gels for water shutoff in fractured reservoirs.

关键词： Double network structure gel swelling Rupture pressure Fractured core Oil recovery factor

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The effect of betaine surfactants on the association behavior of associating polymer

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Petroleum Science 2021年第5期18卷 1441-1449页

作者： ji-jiang ge Tian-Ci Zhang Yi-Ping Pan Xuan Zhang College of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina

The interfacial properties and rheological behavior of surfactant/polymer complex systems were measured to investigate the association behavior of the associating *** with the pure surfactant solution,there are two inflection points in the surface tension curve for the surfactant/polymer complex *** two inflection points are dependent on the surfactant type and polymer *** effect of surfactant on the rheological behavior of polymer can be divided into two ***,the addition of short-chain betaine surfactant is detrimental to the viscosity of polymer solution due to the electrostatic shielding ***,long-chain betaine surfactant also reduces the viscosity of polymer solutions at low ***,when the concentration of the long-chain betaine surfactant is relatively high,the long-chain betaine surfactant could form worm-like micelles that promote the intermolecular association and thus increase the number of associating junctions,thereby resulting in the augmentation of *** it is necessary to apply the long-chain betaine surfactant to build the polymer/surfactant flooding *** interaction model between surfactant and polymer is proposed,which is different from the traditional‘Three-Region Model’.

关键词： Betaine surfactant Associating polymer Surface tension Viscosity Intermolecular association

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Self-healing elastomer modified proppants for proppant flowback control in hydraulic fracturing

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Petroleum Science 2022年第1期19卷 245-253页

作者： jian-Da Li Gui-Cai Zhang ji-jiang ge Wen-Li Qiao Ping jiang Hai-Hua Pei School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China

To address proppant flowback issues during post-fracturing treatments and production,self-healing elastomer modified proppants(SMPs)are *** to their inherent self-aggregation behavior,the SMPs can aggregate together spontaneously to prevent proppant flowback and increase the pack *** is noteworthy that the SMPs have a firm and dry self-healing elastomer(SE)coating,making their storage,transport and use as conventional proppants *** SE synthesized through polymerization is rich in amidogens and carbonyl groups as characterized by Fourier transform infrared spectroscopy and the proton nuclear magnetic *** and thermomechanical properties of the SE coating are revealed by the thermogravimetric analysis,the differential scanning calorimetry and the rheological *** self-aggregation behavior of the SMPs is demonstrated by the adhesion force *** reversible hydrogen bonding interactions in SE coating contribute to the self-aggregation behavior of the SMPs,which is revealed by the thixotropy test and the FTIR analysis at different *** the self-aggregation behavior,the crushed proppants can aggregate in situ to form a stable structure again and therefore reduce the threat of narrowing down the fracture and proppant flowback,which has an important practical significance during oil and gas production.

关键词： Proppant flowback Self-healing elastomer Self-aggregation Adhesion force

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Self-aggregating behavior of poly(4-vinyl pyridine)and the potential in mitigating sand production based onπ-πstacking interaction

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Petroleum Science 2022年第5期19卷 2165-2174页

作者： jian-Da Li Gui-Cai Zhang ji-jiang ge Wen-Li Qiao Hong Li Ping jiang Hai-Hua Pei School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China College of Pharmacy Shandong University of Traditional Chinese MedicineJinan250000ShandongPR China

Unconsolidated sandstone reservoirs are most susceptible to sand production that leads to a dramatic oil production *** this study,the poly(4-vinyl pyridine)(P_(4)VP)incorporated with self-aggregating behavior was proposed for sand migration *** P_(4)VP could aggregate sand grains spontaneously throughπ-πstacking interactions to withstand the drag forces *** influential factors on the self-aggregating behavior of the P_(4)VP were evaluated by adhesion force *** adsorption as well as desorption behavior of P_(4)VP on sand grains was characterized by scanning electron microscopy and adhesion force test at different pH *** result indicated that the pH altered the forms of surface silanol groups on sand grains,which in turn affected the adsorption process of P_(4)*** spontaneous dimerization of P_(4)VP molecules resulting from theπ-πstacking interaction was demonstrated by reduced density gradient analysis,which contributed to the self-aggregating behavior and the thermally reversible characteristic of the P_(4)*** sand stabilization test revealed that the P_(4)VP showed wide pH and temperature ranges of *** production of sands can be mitigated effectively at 20-130℃ within the pH range of 4-8.

关键词： Self-aggregating Poly(4-vinyl pyridine) π-πstacking Sand migration control

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Effect of AMPS(2-acrylamido-2-methylpropane sulfonic acid) content on the properties of polymer gels

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Petroleum Science 2022年第2期19卷 697-706页

作者： Tian-Ci Zhang ji-jiang ge Hao Wu Hong-Bin Guo Bao-Lei jiao Zhen Qian School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Petroleum Engineering Institute Northwest Branch of SinopecUrumqi830011XinjiangChina

The BST oilfield in the northwestern Taklamakan Desert is a fractured carbonate reservoir,but issues of water breakthrough are becoming increasingly severe with the development of water ***,the high-temperature and high-salt conditions(130°C,71695 mg/L)of the BST oilfield pose challenges for the development of plugging *** this study,the effects of 2-acrylamido-2-methylpropane sulfonic acid(AMPS)content on AM/AMPS copolymers and gels were studied through viscosity measurements,nuclear magnetic resonance(NMR),and cryo-scanning electron microscope(Cryo-SEM).Moreover,the AMPS stabilization mechanism of the polymers and gels was *** and salt-tolerant gel systems were developed,and their gelation properties,thermal stability,injection capacity,and plugging ability were *** results showed inconsistencies between the effects of AMPS content on the polymers and *** the polymers,the thermal stability increased with increased AMPS content in the ***,excessive AMPS content resulted in poor gelation and low *** developed gel systems with S30 polymer(AMPS content is approximately 26%)exhibited excellent thermal stability,controllable gelation time,good injection capacity,and plugging *** field application results indicated that most production wells had a positive response,with reduced water-cut and increased daily oil production.

关键词： gels 2-Acrylamido-2-methylpropane sulfonic acid Enhanced oil recovery Hydrolysis Syneresis

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Development of self-generated proppant based on modified low-density and low-viscosity epoxy resin and its evaluation

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Petroleum Science 2022年第5期19卷 2240-2252页

作者： jia-Cheng Fan Zhan-Qing Qu Tian-Kui Guo Ning Qi Ming Chen jian Hou ji-jiang ge Xiao-Qiang Liu ji-Wei Wang College of Petroleum Engineering China University of PetroleumQingdao266580ShandongChina Beijing International Center for Gas Hydrate School of Earth and Space SciencesPeking UniversityBeijing100871China

Hydraulic fracturing is a critical technology for the economic development of unconventional oil and gas *** main factor influencing fracture propping and reservoir stimulation effect is proppant *** increasing depth of fractured oil and gas reservoirs is causing growing difficulty in hydraulic ***,the migration of conventional proppants within the fracture is always limited due to small fracture width and rigid proppant ***,proppants with good transportation capacity and fracture propping effects are ***,a novel self-generated proppant based on toughened low-viscosity and low-density epoxy resin was developed to satisfy this ***,proppant performances were ***-viscosity and low-density epoxy resin was generated when the thiol-ene click chemical reaction product of eugenol and 1-thioglycerol reacts with the ***,the resin was toughened with graphite particles to increase its compressive strength from50.8 to 72.1 MPa based on micro-cracking mechanism and crazing-nail anchor *** adduct of diethylene triamine and butyl glycidyl ether and the Si O2 nanoparticles were treated as the curing agent and emulsifier respectively to form the *** emulsion is transformed into solid particles of various sizes within a reservoir to prop the *** shows good migration capacity of this self-generated proppant due to the low density of epoxy resin.

关键词： Low-viscosity and low-density epoxy resin Resin toughening Self-generated proppant Performance evaluation

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Numerical simulation on proppant migration and placement within the rough and complex fractures

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Petroleum Science 2022年第5期19卷 2268-2283页

作者： Tian-Kui Guo Zhi-Lin Luo jin Zhou Yuan-Zhi Gong Cai-Li Dai jin Tang Yang Yu Bing Xiao Bao-Lun Niu ji-jiang ge College of Petroleum Engineering China University of Petroleum(Huadong)Qingdao266580ShandongChina Southwest Oil and Gas Field Company PetroChinaChengdu610051SichuanChina Exploration Division Tarim Oilfield CompanyPetroChinaKorla841000XinjiangChina Dongxin Oil Production Plant Shengli Oil Field BranchSinopecDongying257100ShandongChina Research Institute of Petroleum Exploration and Development PetroChinaBeijing100083China Zhongyuan Petroleum Engineering Company SinopecPuyang457001HenanChina Zhongyuan Oilfield Company SinopecPuyang457001HenanChina

Hydraulic fracturing is a key technology for the development of unconventional hydrocarbon *** proppant placement morphology determines the fracture conductivity,thus affecting the reservoir stimulation *** this paper,the proppant migration and placement within complex fractures was studied by considering the fracture wall roughness through computational fluid mechanics-discrete element method(CFD-DEM)in numerical simulation,which is a key approach to study the proppant migration and *** results show that the proppant placement non-uniformity,proppant migration capacity,and proppant volume filled in the far-end and the secondary branched fracture are enhanced within the rough fracture compared with those within smooth *** proppant migration capacity is increased within the fracture at low inclination angles(ger in the inclined fracture than that in the vertical *** rise of injection rate and fracturing fluid viscosity causes more proppants migrate to far-end or secondary fractures,resulting in a non-proppant area within the near-wellbore *** increase by 1.3 times in the injection rate and 3 times in the fracturing fluid viscosity leads to a decrease by 26.6%and 27%,respectively,in the proppant placement area within the near-wellbore *** staged injection with small size proppants followed by large size proppants increases the proppant placement area in the primary fracture by 13%-26%,and that with large size proppants followed by small size proppants increases the proppant placement area by 19%-25%,which is due to that the latter method facilitates filling of the secondary branched *** injection location mainly affects the proppant filling degree within the near-wellbore *** with the upper injection,the middle and lower injection is not beneficial to filling of proppants within the near-wellbore fracture.

关键词： Hydraulic fracturing Proppant migration and placement Rough fracture wall Complex fracture CFD-DEM coupling

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Composite-mask GAN based on refined optical flow and disparity map for SLAM visual odometry

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Optoelectronics Letters 2025年

作者： ji Yuehui jiang jingwei LIU Junjie SONG Yu GAO Qiang School of Electrical Engineering and Automation， Tianjin University of Technology Tianjin Key Laboratory of Control Theory and Application for Complex Systems

Although deep learning methods have been widely applied in slam visual odometry over the past decade with impressive improvements， the accuracy remains limited in complex dynamic environments. In this paper， a composite mask-based generative adversarial network is introduced to predict camera motion and binocular depth maps. Specifically， a perceptual generator is constructed to obtain the corresponding parallax map and optical flow from between two neighboring frames. Then， an iterative pose improvement strategy is proposed to improve the accuracy of pose estimation. Finally， a composite mask is embedded in the discriminator to sense structural deformation in the synthesized virtual image， thereby increasing the overall structural constraints of the network model， improving the accuracy of camera pose estimation， and reducing drift issues in the Visual Odometer. Detailed quantitative and qualitative evaluations on the KITTI dataset show that the proposed framework outperforms existing conventional， supervised learning and unsupervised depth VO methods， providing better results in both pose estimation and depth estimation.

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Homologous CoS2 interface with directed electron transfer and strong chloridion repulsion for efficient seawater oxidation

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Science China Chemistry 2025年

作者： Yuan Tian jiang-Bo Chen jie Ying ge Tian Yu-Xuan Xiao Yi Lu Si-Ming Wu Wei geng Ling Shen Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering and Shenzhen Research Institute & Laoshan Laboratory Wuhan University of Technology School of Chemical Engineering and Technology Sun Yat-Sen University National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory

Seawater electrolysis is a highly promising method to produce high energy density hydrogen,especially in dry areas that have scarce freshwater ***,application of seawater electrolysis is confronted by two major problems associated with catalysts employed for the anodic oxygen evolution reaction （OER） including the competitive hypochlorite evolution reaction（HCER） and strong chloridion （Cl–） triggered *** studies aimed at overcoming these problems,a facile method has been developed to synthesize a homologous CoS2heterojunction as an OER *** to a difference in work functions at the interface and increased electron density,this material has directed electron transfer and strong chloridion repulsion properties,*** have shown that CoS2achieves low overpotentials of 289 and 322 mV at 10 mA cm-2current density in respective alkaline （1 M KOH） and alkaline simulated seawater ***,the outstanding stability of CoS2is reflected in a negligible decline in activity during promotion of the OER for 100 *** of density functional theory calculations reveal that the homologous CoS2heterojunction promotes directed electron transport for optimizing adsorption/desorption of reactive species and heightens the Cl-adsorption energy for strongly repulsing Cl-,phenomena that enhance OER performance in alkaline simulated seawater.

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Advanced Functional Electromagnetic Shielding Materials:A Review Based on Micro‑Nano Structure Interface Control of Biomass Cell Walls

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Nano-Micro Letters 2025年第1期17卷 98-134页

作者： Yang Shi Mingjun Wu Shengbo ge jianzhang Li Anoud Saud Alshammari jing Luo Mohammed A.Amin Hua Qiu jinxuan jiang Yazeed M.Asiri Runzhou Huang Hua Hou Zeinhom M.El‑Bahy Zhanhu Guo Chong jia Kaimeng Xu Xiangmeng Chen Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037People’s Republic of China State Key Laboratory of Efficient Production of Forest Resourced Beijing Forestry UniversityQinghua East Road 35Haidian DistrictBeijing 100083People’s Republic of China Department of Physics Faculty of Sciences‑ArarNorthern Border UniversityArar 91431Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 1109921944 TaifSaudi Arabia Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr CityCairo 11884Egypt Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products International Joint Research Center for Biomass MaterialsSouthwest Forestry UniversityKunming 650224People’s Republic of China School of Science Henan Agricultural UniversityZhengzhou 450002People’s Republic of China

Research efforts on electromagnetic interference(EMI)shielding materials have begun to converge on green and sustainable biomass *** materials offer numerous advantages such as being lightweight,porous,and *** to their porous nature,interfacial compatibility,and electrical conductivity,biomass materials hold significant potential as EMI shielding *** concerted efforts on the EMI shielding of biomass materials have been reported,this research area is still relatively new compared to traditional EMI shielding *** particular,a more comprehensive study and summary of the factors influencing biomass EMI shielding materials including the pore structure adjustment,preparation process,and micro-control would be *** preparation methods and characteristics of wood,bamboo,cellulose and lignin in EMI shielding field are critically discussed in this paper,and similar biomass EMI materials are summarized and *** composite methods and fillers of various biomass materials were *** paper also highlights the mechanism of EMI shielding as well as existing prospects and challenges for development trends in this field.

关键词： Biomass materials Electromagnetic interference shielding Micro-nano structure interface control Conductivity

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