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Productivity Prediction Model of Perforated Horizontal Well Based on Permeability Calculation in Near-Well High Permeability Reservoir Area

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Energy Engineering 2024年第1期121卷 59-75页

作者： Shuangshuang Zhang Kangliang Guo Xinchen Gao Haoran Yang Jinfeng Zhang Xing Han College of the Earth Science Yangtze UniversityWuhan430100China petrochina changqing oilfield fifth oil production plant Xi’an710201China Sinopec Jianghan oilfield Information Center Wuhan430100China

To improve the productivity of oil wells,perforation technology is usually used to improve the productivity of horizontal wells in oilfield *** the perforation operation,the perforation channel around the wellbore will form a near-well high-permeability reservoir area with the penetration depth as the radius,that is,the formation has different permeability characteristics with the perforation depth as the dividing ***,the permeability is measured by the permeability tester,but this approach has a high workload and limited *** this paper,according to the reservoir characteristics of perforated horizontal wells,the reservoir is divided into two areas:the original reservoir area and the near-well high permeability reservoir *** on the theory of seepage mechanics and the formula of open hole productivity,the permeability calculation formula of near-well high permeability reservoir area with perforation parameters is *** to the principle of seepage continuity,the seepage is regarded as the synthesis of two directions:the horizontal plane elliptic seepage field and the vertical plane radial seepage field,and the oil well productivity prediction model of the perforated horizontal well is established by *** model comparison demonstrates that the model is reasonable and *** calculate and analyze the effect of oil well production and the law of influencing factors,actual production data of the oilfield are substituted into the oil well productivity *** can effectively guide the technical process design and effect prediction of perforated horizontal wells.

关键词： Perforated horizontal well permeability productivity model sensitivity analysis

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Prediction on Failure Pressure of Pipeline Containing Corrosion Defects Based on ISSA-BPNNModel

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Energy Engineering 2024年第3期121卷 821-834页

作者： Qi Zhuang Dong Liu Zhuo Chen petrochina changqing oilfield Company The Second Gas Production PlantXi’an710000China petrochina changqing oilfield Company Safety and Environmental Supervision Department Co.Ltd.Xi’an710000China Sinopec Northwest oilfield Company The Second Oil Production Plant Co.Ltd.Urumqi830016China

oil and gas pipelines are affected by many factors,such as pipe wall thinning and pipeline *** prediction of failure pressure of oil and gas pipelines can provide technical support for pipeline safety *** at the shortcomings of the BP Neural Network(BPNN)model,such as low learning efficiency,sensitivity to initial weights,and easy falling into a local optimal state,an Improved Sparrow Search Algorithm(ISSA)is adopted to optimize the initial weights and thresholds of BPNN,and an ISSA-BPNN failure pressure prediction model for corroded pipelines is *** 61 sets of pipelines blasting test data as an example,the prediction model was built and predicted by MATLAB software,and compared with the BPNN model,GA-BPNN model,and SSA-BPNN *** results show that the MAPE of the ISSA-BPNN model is 3.4177%,and the R2 is 0.9880,both of which are superior to its comparison *** the ISSA-BPNN model has high prediction accuracy and stability,and can provide support for pipeline inspection and maintenance.

关键词： oil and gas pipeline corrosion defect failure pressure prediction sparrow search algorithm BP neural network logistic chaotic map

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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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Geometry and formation mechanism of tension gashes and their implication on the hydrocarbon accumulation in the deep-seated strata of sedimentary basin:A case from Shunnan area of Tarim Basin

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Petroleum Science 2024年第1期21卷 87-99页

作者： Yan-Nan Du Kong-You Wu Yin Liu Yan-Ying Li Zi-Cheng Cao You-Wei Cui Jun Liu Key Laboratory of Deep oil and Gas School of GeosciencesChina University of Petroleum(East China)Qingdao 266580ShandongChina Exploration and Development Research Institute SINOPEC Northwest Oilfield BranchUrumqi 830011XinjiangChina The fifth Gas production plant Changqing OilfieldPetroChinaXi'an 710018ShaanxiChina

With the theoretical and technological developments related to cratonic strike-slip faults,the Shuntuoguole Low Uplift in the Tarim Basin has attracted considerable attention *** by multi-stage tectonic movements,the strike-slip faults have controlled the distribution of hydrocarbon resources owing to the special fault characteristics and fault-related *** contrast,the kinematics and formation mechanism of strike-slip faults in buried sedimentary basins are difficult to investigate,limiting the discussion of these faults and hydrocarbon *** this study,we identified the characteristics of massive sigmoidal tension gashes(STGs)that formed in the Shunnan area of the Tarim ***-resolution three-dimensional seismic data and attribute analyses were used to investigate their geometric and kinematic ***,the stress state of each point of the STGs was calculated using seismic curvature ***,the formation mechanism of the STGs and their roles in controlling hydrocarbon migration and accumulation were *** results suggest that:(1)the STGs developed in the Shunnan area have a wide distribution,with a tensile fault arranged in an enéchelon pattern,showing an S-shaped *** STGs formed in multiple stages,and differential rotation occurred along the direction of strike-slip stress during formation.(2)Near the principal displacement zone of the strike-slip faults,the stress value of the STGs was higher,gradually decreasing at both *** shallow layer deformation was greater than the deep layer deformation.(3)STGs are critical for connecting source rocks,migrating oil and gas,sealing horizontally,and developing efficient *** study not only provides seismic evidence for the formation and evolution of super large STGs,but also provides certain guidance for oil and gas exploration in this area.

关键词： Tarim Basin Sigmoidal tension gashes Seismic attributes Shear stress calculation Formation mechanism Reservoir control

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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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Provenance and paleogeography of Carboniferous-Permian strata in the Bayanhot Basin:Constraints from sedimentary records and detrital zircon geochronology

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Geoscience Frontiers 2021年第3期12卷 113-131页

作者： Junfeng Zhao Yijun Zhou KeWang Xuan Li Zhanrong Ma Zhengzhong Ruan DongWang Rui Xue State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an710069China changqing Branch of Geophysical Research Institute BGPCNPCXi'an 710021China Exploration and Development Research Institute Changqing Oilfield Company of PetroChinaXi'an 710021China Twelfth oil production plant Changqing Oil Field Company of PetroChinaHeshui 745400China

The Bayanhot Basin is a superimposed basin that experienced multiple-staged tectonic movements;it is in the eastern Alxa Block,adjacent to the North China Craton(NCC)and the North Qilian Orogenic Belt(NQOB).There are well-developed Paleozoic-Cenozoic strata in this basin,and these provide a crucial window to a greater understanding of the amalgamation process and source-to-sink relationships between the Alxa Block and surrounding tectonic ***,due to intensive post-depositional modification,and lack of subsurface data,several fundamental issues-including the distribution and evolution of the depositional systems,provenance supplies and source-to-sink relationships during the Carboniferous-Permian remain unclear and thus hinder hydrocarbon exploration and limit the geological understanding of this *** integrated outcrop surveys,new drilling data,and detrital zircon dating,this study examines the paleogeographic distribution and evolution,and provenance characteristics of the Carboniferous-Permian strata in the Bayanhot *** results show that the Bayanhot Basin experienced a long-term depositional evolution process from transgression to retrogression during the Carboniferous-late *** transgression extent could reach the central basin in the early *** maximum regional transgression occurred in the early Permian and might connect the Qilian and North China seas with each ***,a gradual regression followed until the end of the *** northwestern NCC appeared as a paleo-uplift area and served as a sediments provenance area for the Alxa Block at that *** NCC,Bayanwula Mountain,and NQOB jointly served as major provenances during the *** was no ocean separation,nor was there an orogenic belt between the Alxa Block and the NCC that provided sediments for both sides during the *** accretion of the Alxa and North China blocks should have been completed before t

关键词： Carboniferous-Permian Detrital zircon geochronology Paleogeography Bayanhot Basin Alxa Block North China Craton

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Reservoir formation conditions and key technologies for exploration and development in Qingcheng large oilfield

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Petroleum Research 2020年第3期5卷 181-201页

作者： Suotang Fu Jinhua Fu Xiaobing Niu Shixiang Li Zhiyu Wu Xinping Zhou Jiangyan Liu National Engineering Laboratory for Exploration and Development of Low-Permeability oil&Gas Fields Xi’an City710018China petrochina changqing oilfield Company Xi’an City710018China No.11 oil production plant PetroChina Changqing Oilfield CompanyXifeng745000China China University of Petroleum(East China) Qingdao266580China Exploration and Development Research Institute PetroChina Changqing Oilfield CompanyXi’an710018China

The Qingcheng oilfield,the largest shale oil field in China,was discovered in 2019 in source rock of Chang 7 Member of Mesozoic Yanchang Formation,changqing oilfield in Ordos Basin,with newly increased proven geological reserves of 358 million tons,predicted geological reserves of 693 million tons,and a total of 1.051 billion tons of shale oil *** achieves a historic breakthrough in exploration of shale oil in Chang 7 *** recent years,focusing on key issues,such as whether there develop sweet spots in source rock,whether commercial oil production capacity can be formed,and whether scale-effective development can be achieved,studies about geological conditions for shale oil accumulation have been continuously carried out,key supporting technologies have been developed,and a series of theoretical innovations and technological breakthroughs have been achieved in oil exploration in source *** results indicate that shale oil accumulation in Chang 7 Member is controlled by following ***,lacustrine black shale,dark mudstone and other high-quality source rocks lay a material foundation for shale oil ***,sandy deposits intercalated within black shale and dark mudstones are exploration sweet spots,and sandbody combination types are controlled by morphology of bottom of the lacustrine ***,reservoir properties are good due to development of micro-nano pore ***,reservoirs with high oil saturation and high gas-oil ratio are formed due to high-intensity oil charging in source *** matching of multiple factors is a key for shale oil accumulation in Chang 7 Member in Ordos *** innovation of key supporting technologies,exploration and development technologies for shale oil are developed,and substantial breakthrough on exploration and development of shale oil is *** first application of logging-seismic combination technology in loess plateau improves significantly quality of 3D seismic

关键词： Chang 7 member of Yanchang formation Shale oil Geological conditions for oil accumulation Supporting technologies for exploration and development Qingcheng oilfield Ordos basin

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Characterization of the generalized permeability jail in tight reservoirs by analyzing relative-permeability curves and numerical simulation

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Petroleum Science 2023年第5期20卷 2939-2950页

作者： Feng-Peng Lai Zhi-Ping Li He-Xin Wei Wei Zhang School of Energy Resources China University of GeosciencesBeijing100083China Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering Beijing100083China Changchun oil production plant of Jilin oilfield PetroChinaChangchun130062JilinChina changqing oilfield Company PetroChinaXi'an710018ShaanxiChina

This study comprehensively characterizes the boundary values of generalized permeability jail in tight reservoirs through relative-permeability curve analysis,numerical simulation,and economic evaluation.A total number of 108 relative-permeability curves of rock samples from tight reservoirs were obtained,and the characteristics of relative-permeability curves were *** irreducible water saturation(Swi)mainly ranges from 20% to 70%,and the residual gas saturation(Sgr)ranges from 5% to 15% for 55% of the *** relative-permeability curves are categorized into six types(Category-Ⅰ to Ⅵ)by analyzing the following characteristics:The relative permeability of gas at Swi,the relative permeability of water at Sgr,and the relative permeability corresponding to the isotonic *** relative permeability curves were normalized to facilitate numerical simulation and evaluate the impact of different types of curves on production *** results of simulation show significant difference in production performance for different types of relative-permeability curves:Category-Ⅰ corresponds to the case with best well performance,whereas Categories-Ⅴ and Ⅵ correspond to the cases with least production *** results of economic evaluation show a generalized permeability jail for Categories-Ⅳ,Ⅴ,and Ⅵ,and the permeability jail develops when the relative permeability of gas and water is below *** study further quantifies the range of micro-pore parameters corresponding to the generalized permeability jail for a tight sandstone reservoir.

关键词： Generalized permeability jail Characterization Relative permeability curve Numerical simulation Pore structure

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Numerical Simulation of a Two-Phase Flow with Low Permeability anda Start-Up Pressure Gradient

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Fluid Dynamics & Materials Processing 2023年第1期19卷 175-185页

作者： Xuanyu Dong Jingyao Yang School of Geosciences Yangtze UniversityWuhan430100China Gas production plant 5 Changqing Oilfield Company of PetroChinaXi’an710000China

A new numerical model for low-permeability reservoirs is *** model incorporates the nonlinear characteristics of oil-water two-phase flows while taking into account the initiation pressure *** numerical solutions are obtained using a finite difference *** correctness of the method is demonstrated using a two-dimensional inhomogeneous low permeability ***,the differences in the cumulative oil and water production are investigated for different starting water *** is shown that when the initial water saturation grows,the water content of the block continues to rise and the cumulative oil production gradually decreases.

关键词： Low-permeability reservoirs two-phase flow water cut start-up pressure gradient non-darcy flow

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Distribution Patterns of Calcite Cement in the Turbidite Sandstones of the Shahejie Formation in the Dongying Depression,Eastern China

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 1041-1056页

作者： ZHANG Yongwang QU Zhengyang State Key Laboratory of Petroleum Resources and Prospecting Beijing 102249China College of Geosciences China University of Petroleum-BeijingBeijing 102249China No.4 oil production plant PetroChina Changqing Oilfield CompanyYinchuan 718500China

Calcite cements are volumetrically dominant among the most diagenetic constituents in turbidite sandstones of the Paleogene Shahejie Formation in the Dongying *** results show carbonate cements mainly occur in three phases:Calcite I(pre-compaction),Calcite II(post-compaction)and ankerite in the turbidite *** isotopic composition of Calcite I and Calcite II range from−4.3‰to 4.4‰,−3.5‰to 4.3‰PDB,respectively,suggesting that the calcite cements are mainly derived from the interbedded *** early calcite cement precipitated from the mixing of lacustrine and meteoric waters at 38-69℃.The late-phase calcite precipitated from pore waters modified by water-rock interactions at 64-126℃.Two distribution patterns of calcite cements can be identified,depending on their position within the *** peripheral cementation of the sandstones is near the sand-shale *** development of cement is controlled by sandstone thickness and the properties of the interbedded *** scattered cementation,the distribution of the calcite cement is not controlled by the sand-shale *** cement was preferentially distributed in coarse-grained sandstones,indicating that sandstones with high original permeability are the preferred pathway for the migration of early diagenetic fluids.

关键词： turbidite sandstone calcite cement distribution patterns Dongying Depression

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