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A review of SAGD technology development and its possible application potential on thin-layer super-heavy oil reservoirs

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Geoscience Frontiers 2022年第4期13卷 1-10页

作者： Guodong Cui Ting Liu Jingyu Xie Guanghui Rong Lihong Yang Faculty of engineering China University of GeosciencesWuhan 430074China The 2th oil production plant of PetroChina Changqing oilfield Company Qingyang 710021China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China The 12th oil production plant of PetroChina Changqing oilfield Company Xi’an 710000China Sinopec Petroleum Exploration and production Research Institute Beijing 100083China

Super-heavy oil is a significant unconventional energy source,and more than 30 years of research have shown that steam-assisted gravity drainage(SAGD)technology is suitable for thick super-heavy oil ***,more and more thin-layer super-heavy oil reservoirs have been discovered in China,while their deep buried depth and serous heterogeneity make the existing SAGD technology difficult to apply,so it is urgent to improve the existing SAGD technology for the thin-layer super-heavy *** this end,this paper focuses on the enlightenment of field application in SAGD ***,based on typical SAGD field projects,the development history of SAGD technology in the world was reviewed,and the influence of reservoir physical properties on the application of SAGD technology in thin-layer superheavy oil reservoirs was ***,the well pattern,wellbore structure,pre-heating,artificial lift,and monitor technique of SAGD were detailed described,and their adjustment direction was expounded for the development of thin-layer super-heavy oil ***,the gas-and solventassistant SAGD were comprehensively evaluated,and their application potential in thin-layer superheavy oil reservoirs was *** research results can provide theoretical guidance for the application of SAGD technology in thin-layer super-heavy oil reservoirs.

关键词： SAGD Thin-layer super-heavy oil Development technology Multimedia assisted SAGD

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On the localised corrosion of carbon steel induced by the in-situ local damage of porous corrosion products

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Journal of Materials Science & technology 2020年第19期54卷 95-104页

作者： Lin Pang Zhengbin Wang Yugui Zheng Xueming Lai Xu Han CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and engineering University of Science and Technology of ChinaHefei230026China Dagang oilfield oil production technology Research Institute of China National Petroleum Corporation Tianjin300280China Third oil production plant of Dagang oilfield Company Cangzhou061723China

The effect of in-situ local damage of uniform porous corrosion products on the localised corrosion of carbon steel is investigated using the wire beam electrode technique(WBE)combined with morphology characterisation and electrochemical *** WBE measurements demonstrate that the localised corrosion is enhanced by the in-situ local removal of porous corrosion products,supported by the morphology characterisation and electrochemical *** enhanced localised corrosion does not originate from the damaged wire in WBE where the corrosion products are removed but from the other undamaged wires,which is reported for the first time.A mechanism is proposed that the intensive anodic polarisation effect of the damaged wire on the undamaged wires could account for the enhanced localised corrosion,which is due to the protective corrosion products newly formed on the damaged surface and the increase in the potential of damaged wire.

关键词： Carbon steel Localised corrosion Wire beam electrode Corrosion products

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A new evaluation method of gel's dynamic sealing characteristic in porous media

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Journal of Central South University 2014年第8期21卷 3225-3232页

作者：吴志伟岳湘安李立峰张义杨志国 Key Laboratory of Petroleum engineering of Ministry of Education(China University of Petroleum) Petroleum engineering Faculty China University of PetroleumBeijing 1st oil production plant of Jiangsu oilfield (SINOPEC) Zakum oil Development Company

Water shutoff through injection wells is one of the most important techniques used for water injection profile control and modification in severely heterogeneous reservoirs,aiming at stabilizing oil *** has been widely reported that the effectiveness and efficiency of water shutoff using gel is mostly dependent on the gel dynamic sealing properties in the porous *** the gelation strength and gelation time of polymer gel were ***,core flowing experiments were conducted before and after gelation in a 32 m long sand *** addition,water flooding core experiments were also carried out in a long core of 80 cm before and after injecting gel system to check the reliability of this evaluation *** experimental results show that moderate-strength gel can be formed at 65 °*** to the integrated evaluation of the plugging coefficient,plugging strength and water breakthrough time,the gel particles are capable of migrating to a distance of 7.47 m from the injection point of the 32 m long sand pack during the water injection process after *** on sands gelation status and effluent analyses,the effective migration distance of the gel particles is 4-14 *** the core flooding experiments using the 80 cm heterogeneous core,it is evidenced that the gel can be formed in the deep reservoir(40.63% of total length) with the plugging strength as high as 6.33 MPa/m,which leads to extra oil recovery of 10.55% of original oil in place(OOIP) by water flooding after gel treatment.

关键词： polyacrylamide gel sealing characteristic oil recovery

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Copper ions-me diate d dynamic re dox-responsive microgels synergize with silicone for efficient and sustainable antibacterial properties

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Journal of Materials Science & technology 2023年第12期143卷 253-267页

作者： Huali Li Liuqin Zhang Xiaohu Zhang Shuwen Luo Baoshan Yang Min Wu Wei-Hua Li Fa-Qian Liu School of Chemical engineering and technology Sun Yat-sen UniversityZhuhai 519082China School of Materials Science and engineering Sun Yat-sen UniversityGuangzhou 510275China Offshore oil production plant of Sinopec Shengli oilfield Company Dongying 257237China

The antifouling of marine facilities placed below the waterline is a key constraint to the development of the marine ***,commercial Cu_(2)O-based antifouling coatings still have defects such as agglomeration,oxidation,short duration and high *** this reason,we developed for the first time a triple antifouling system consisting of Cu_(2)O@poly(NIPAM-co-DAm)(Cu_(2)O@PND)dynamic redox micro-gels triggered by copper ions and polydimethylsiloxane(PDMS).The catechol groups of PND nanogels can chelate Cu^(2+)and reduce it in situ to obtain Cu_(2)O@PND microgels,which guarantees the stable release of Cu^(+).Furthermore,Cu_(2)O remains stable and free from oxidation because of the electron transfer between PND and Cu^(2+).Finally,superior antifouling performance was achieved by combining the stable Cu^(+)re-leased from Cu_(2)O,in situ conversion of PND to hydrogel,and its oxidation to produce active substances and H_(2)O_(2),and PDMS coating with low surface energy.

关键词： Hydrogel Copper ions Dynamic redox Silicone Efficient-sustainable release Antibacterial

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Seismic Sedimentology Interpretation Method of Meandering Fluvial Reservoir:From Model to Real Data

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Journal of Earth Science 2015年第4期26卷 598-606页

作者： Tao Zhang Xianguo Zhang Chengyan Lin Jingfeng Yu Shouxiu Zhang College of Earth Science and engineering Shandong University of Science and Technology School of Geosciences China University of Petroleum Exploration and Development Research Institute Xinjiang Oilfield Company Dongxin oil production plant Shengli Oilfield Company

Reservoir architecture of meandering river deposition is complex and traditional seismic facies interpretation method cannot characterize it when layer thickness is under seismic vertical reso- lution. In this study, a seismic sedimentology interpretation method and workflow for point bar char- acterization is built. Firstly, the influences of seismic frequency and sandstone thickness on seismic re- flection are analyzed by outcrop detection with ground penetrating radar （GPR） and seismic forward modeling. It is found that （1） sandstone thickness can influence seismic reflection of point bar architecture. With the increasing of sandstone thickness from 1/4 wavelength （λ） to λ/2, seismic reflection geometries various from ambiguous reflection, ＂V＂ type reflection to ＂X＂ type reflection; （2） seismic frequency can influence reservoirs＇ seismic reflection geometry. Seismic events follow inclined lateral aggradation surfaces, which is isochronic depositional boundaries, in high frequency seismic data while the events extend along lithologic surfaces, which are level, in low frequency data. Secondly, strata slice interpretation method for thin layer depositional characterization is discussed with seismic forward modeling. Lastly, a method and workflow based on the above study is built which includes seismic frequency analysis, 90° phasing, stratal slicing and integrated interpretation of slice and seismic profile. This method is used in real data study in Tiger shoal, the Gulf of Mexico. Two episodes of meandering fluvial deposition is recognized in the study layer. Sandstone of the lower unit, which is formed in low base level stage, distributes limited. Sandstone distribution dimension and channel sinuosity become larger in the upper layer, which is high base level deposition.

关键词： point bar reservoir architecture seismic sedimentology stratal slice.

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Quantitative investigation of nanofluid imbibition in tight oil reservoirs based on NMR technique

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Petroleum Science 2022年第5期19卷 2185-2198页

作者： Tian-Tian Zhang Zhi-Ping Li Caspar Daniel Adenutsi Yong-Zhou Wei Zhen-Fu Ma Qing You School of Energy Resources China University of GeosciencesBeijing10083China Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development engineering Beijing10083China Core and Rock Properties Laboratory Department of Petroleum EngineeringFaculty of Civil and Geo-EngineeringKwame Nkrumah University of Science and TechnologyKumasiGhana Binnan oil production plant Shengli Oilfield CompanySINOPECBinzhou256606ShandongChina Hekou oil production plant Shengli Oilfield CompanySINOPECDongying257200ShandongChina

Nanofluids have been effective chemical additives for enhanced oil recovery(EOR)in tight oil reservoirs due to their special ***,oil imbibition recoveries vary for different *** oil/water distribution in rocks during imbibition using various nanofluids was less discussed in previous *** this study,we systematically examined the imbibition efficiencies of various nanofluids at60℃.Furthermore,the migration of nanofluids and oil distribution in the rock pores were monitored using nuclear magnetic resonance(NMR).The nanofluids were prepared by dispersing silica nanoparticles and five different types of surfactants i.e.,anionic-nonionic,anionic,nonionic,amphoteric and cationic surfactants in deionized(DI)***,interfacial tension(IFT)and contact angle measurements were conducted to reveal the underlying EOR mechanisms of various *** experimental results showed that the EOR potential of the different types of nanofluids was in the order anionic-nonionic>anionic>nonionic>amphoteric>cationic>***-nonionic(sodium lauryl ether sulfate(SLES))and anionic(sodium dodecyl sulfonate(SDS))nanofluids exhibited excellent capability of wettability alteration,and increased oil recovery by 27.96%and 23.08%,respectively,compared to *** NMR results also showed that mesopores(0.1-1μm)were the dominant developed pores in the rocks,and contributed the most to imbibition *** addition,the imbibition of nanofluids initially took place in mesopores and micropores before moving into *** study provides fundamental information on the selection of nanofluids for EOR in tight oil *** study also improved the understanding of oil/water distribution during the imbibition of the proposed nanofluids.

关键词： Nanofluids Spontaneous imbibition Nuclear magnetic resonance(NMR) oil migration Tight oil reservoir

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The effect of silica nanoparticle aggregates on wax dissolution in diesel oil

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Petroleum Science 2011年第2期8卷 207-210页

作者： Sun Renyuan Wang Lei Sun Chao Lin Lei Jiang Hanqiao School of Petroleum engineering China University of Petroleum Qingdao Shandong 266555 China Institute of Drilling ＆ production technology Jidong Oilfield Tangshan Hebei 063004 China Xianhe oil production plant Shengli Oilfield Dongying Shandong 257000 China School of Petroleum engineering China University of Petroleum Beijing 102249 China

In recent years, silica nanoparticle aggregates （SNPAs） have been used to decrease the injection pressure of wells in low permeability reservoirs achieving good results. In order to study the mechanisms for reduction in the injection pressure of low permeability wells by the SNPA-diesel oil system injection, the microstructure of SNPAs was observed with a transmission electron microscope （TEM）. The particle size distribution of SNPAs was also measured by the laser scattering method. The viscosities of diesel oil and SNPA-diesel oil system were measured with a capillary viscometer. The effect of SNPAs on the solubility of wax in the diesel oil was experimentally studied. The influencing factors, including temperature and SNPA concentration in diesel oil, on wax solubility were analyzed. A pore-throat film displacement model （PTFDM） was built for mechanism explanation. The microstructure and size distribution analyses show that the SNPAs are in the nanometer size range. The viscosity of the SNPA-diesel oil system is lower than that of the diesel oil. The solubility of wax in the diesel oil increases greatly due to SNPA addition, the solubility ratio reaches 7.5. The solubility of wax in diesel oil increases with increases in the concentration of SNPAs in the diesel oil and with the temperature. It is proved that the addition of SNPAs to diesel oil helps remove the wax deposited near the wellbore. This maybe one of the main mechanisms for injection pressure decreases in low permeability reservoirs.

关键词： Silica nanoparticle aggregates solubility of wax low permeability reservoir pore-throatfilm displacement model injection pressure

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A Reasonable Approach for the Development of Shale Gas Wells with Consideration of the Stress Sensitivity

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Fluid Dynamics & Materials Processing 2019年第1期15卷 39-51页

作者： Jin Pang Di Luo Haohong Gao Jie Liang Yuanyuan Huang Qi Liu Chongqing University of Science and technology ChongqingChina Shunan Gas production plant PetroChina Southwest Oil&Gasfield CompanyLuzhouChina Southwest Gas production plant PetroChina Zhejiang Oilfield BranchYibinChina Linpan Drilling Branch Sinopec Southwest Petroleum Engineering Co.Ltd.LinpanChina

High-pressure deep shale gas reservoirs are usually highly *** the reasonable production mode of shale gas well is built,the impact of strong stress sensitivity should be fully ***,this study calculated the relationship between permeability and formation pressure under different elastic modulus based on the shale lithology of Long Ma Xi formation in Sichuan Basin by testing and analysing the mechanical parameters of the *** to numerical simulation result,when the elastic modulus exceeds 14.0 GPa,the stress sensitivity of the matrix will slight affect the cumulative gas production of shale ***,the changing relation between fracture conductivity and permeability with fracture pressure and the time of pressure acts were experimentally *** numerical simulation result suggested that the 30-year cumulative gas production considering the stress sensitivity was reduced by 13.5%compared with the 30-year cumulative gas production without considering the stress ***,the production of different production modes under different stress sensitive characteristics was predicted using numerical simulation *** the matrix and fractures are fixed with a same stress-sensitive curve,the initial production allocation will not significantly impact the cumulative gas *** the fractured fractures are subjected to a varying stress sensitive curve,the lower production allocation will result in higher post-production and cumulative gas production.

关键词： Shale stress sensitivity production mode production allocation fractures matrix

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Heat-fluid-solid coupling mechanism of supercritical carbon dioxide jet in rock-breaking

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Petroleum Exploration and Development 2021年第6期48卷 1450-1461页

作者： LI Mukun WANG Gang CHENG Weimin PU Shijie NI Hongjian SHI Xian College of Safety and Environmental engineering Shandong University of Science and TechnologyQingdao 266590China No.1 oil production plant Qinghai Oilfield CompanyPetroChinaQinghai 816499China School of Petroleum engineering China University of Petroleum(East China)Qingdao 266580China

Aiming at the synergistic rock-breaking mechanism of supercritical carbon dioxide(SC-CO_(2))jet pressure and tem-perature difference,a heat-fluid-solid calculation model of rock-breaking stress was established and verified to be effective,and the variations of jet flow field and rock stress with jet standoff distance of SC-CO_(2),water and nitrogen were *** the increase of jet standoff distance,the jet pressure of SC-CO_(2) decreases and the jet temperature difference *** SC-CO_(2) jet is higher in pressure than the nitrogen jet and differs little from the water *** difference of SC-CO_(2) jet is 5 times that of water jet and more than 2.5 ti mes that of nitrogen jet when the jet standoff distance is larger than *** tem-perature stress is the main reason why SC-CO_(2) jet is superior to water and nitrogen jets in *** rock under the SC-CO_(2) jet has greater rock stress,effective rock-breaking jet standoff distance and rock-breaking *** jet pressure plays a major role in rock-breaking when the jet standoff distance is small,while the jet temperature difference plays a major role in rock-breaking when the jet standoff distance is *** SC-CO_(2) jet is an efficient volume rock-breaking method,which results in tensile and shear failure on the rock surface under short time jet and large area tensile failure inside the rock simultaneously under long time jet.

关键词： supercritical carbon dioxide rock-breaking with jet rock stress jet pr essure jet temperature difference tem-perature stress heat-fluid-solid coupling

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Analysis of gas transport behavior in organic and inorganic nanopores based on a unified apparent gas permeability model

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Petroleum Science 2020年第1期17卷 168-181页

作者： Qi Zhang Wen-Dong Wang Yilihamu Kade Bo-Tao Wang Lei Xiong Key Laboratory of Tectonics and Petroleum Resources China University of GeosciencesWuhan 430074HubeiChina School of Petroleum engineering China University of Petroleum(East China)Qingdao 266580ShandongChina Institute of Ground engineering Engineering Technology Research Institute of PetroChina Xinjiang Oilfield CompanyKaramay 834000XinjiangChina oil production plant 5 of PetroChina Changqing oilfield Company Changqing OilfieldXi’an 710200ShaanxiChina oil production plant 1 of PetroChina Xinjiang oilfield Company Karamay 834000XinjiangChina

Different from the conventional gas reservoirs,gas transport in nanoporous shales is complicated due to multiple transport mechanisms and reservoir *** this work,we presented a unified apparent gas permeability model for real gas transport in organic and inorganic nanopores,considering real gas effect,organic matter(OM)porosity,Knudsen diffusion,surface diffusion,and stress ***,the effects of monolayer and multilayer adsorption on gas transport are ***,we validated the model by experimental *** influences of pore radius,pore pressure,OM porosity,temperature,and stress dependence on gas transport behavior and their contributions to the total apparent gas permeability(AGP)were *** results show that the adsorption effect causes Kn(OM)>Kn(IM)when the pore pressure is larger than 1 MPa and the pore radius is less than 100 *** ratio of the AGP over the intrinsic permeability decreases with an increase in pore radius or pore *** nanopores with a radius of less than 10 nm,the effects of the OM porosity,surface diffusion coefficient,and temperature on gas transport cannot be ***,the surface diffusion almost dominates in nanopores with a radius less than 2 nm under high OM porosity *** the small-radius and low-pressure conditions,gas transport is governed by the Knudsen diffusion in *** study focuses on revealing gas transport behavior in nanoporous shales.

关键词： Gas transport Apparent gas permeability model Gas adsorption Surface diffusion Stress dependence

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