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Petroleum 2018年第1期4卷 50-55页

作者： Shengwang Yuan The second oil production plant of Daqing oilfield Daqing163318China

Aiming at the actual demand of Guan 109-1 block in Dagang oilfield,by means of instrumental analysis,chemical analysis,modern physical simulation,viewing polymer viscosity and seepage characteristic as evaluation index,the experimental research on the influence of water disposal method on the property of chemical oil-displacement agent was carried *** showed that through adding scaling agent,scale was formed because of the reaction between scaling agent and Ca^2+,Mg^2+ in the flooding water,which could enhance the viscosity of polymer *** comparing the resistance factor and residual resistance factor of polymer solution which was respectively prepared with flooding water,softened water and scale,the resistance factor and residual resistance factor of polymer solution with scale was the largest,that of polymer solution prepared with softened water was second and that of polymer solution prepared with flooding water came ***,scaling agent weakened the gelling effect between cross-linking agent Cr^3+ and polymer molecule *** earlier the crosslinking agent Cr^3+ was added,the larger the polymer viscosity,resistance factor and residual resistance factor of Cr3t polymer were.

关键词： Seepage characteristic Water disposal Scaling agent Resistance factor and residual resistance factor

Gas-Water production of a Continental Tight-Sandstone Gas Reservoir under Different Fracturing Conditions

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Fluid Dynamics & Materials Processing 2024年第6期20卷 1165-1180页

作者： Yan Liu Tianli Sun Bencheng Wang Yan Feng Southwest oil and Gas Company SINOPECChengdu610041China The second Gas production plant of Southwest Branch SINOPECNanchong637455China

A numerical model of hydraulic fracture propagation is introduced for a representative reservoir(Yuanba continental tight sandstone gas reservoir in Northeast Sichuan).Different parameters are considered,i.e.,the interlayer stress difference,the fracturing discharge rate and the fracturing fluid *** results show that these factors affect the gas and water production by influencing the fracture *** interlayer stress difference can effectively control the fracture *** greater the stress difference,the smaller the dimensionless reconstruction volume of the reservoir,while the flowback rate and gas production are lower.A large displacement fracturing construction increases the fracture-forming efficiency and expands the fracture *** larger the displacement of fracturing construction,the larger the dimensionless reconstruction volume of the reservoir,and the higher the fracture-forming efficiency of fracturing fluid,the flowback rate,and the gas *** viscosity fracturing fluid is suitable for long fractures,while high viscosity fracturing fluid is suitable for wide *** an increase in the fracturing fluid viscosity,the dimensionless reconstruction volume and flowback rate of the reservoir display a non-monotonic behavior,however,their changes are relatively small.

关键词： Tight sandstone gas reservoir fracture propagation flowback rate gas production law water production law influencing factor

Application of binding theory for seepage of viscoelastic fluid in a variable diameter capillary

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Journal of Hydrodynamics 2017年第4期29卷 621-631页

作者：杨二龙谷婷婷王梅李欢 Key Laboratory on Enhanced oil and Gas Recovery of the Ministry of Education Northeast Petroleum University Daqing oilfield of China National Petroleum Corporation School of Computer and Information Technology Northeast Petroleum University second oil production plant of Daqing oilfield of CNPC

The polymer solution for polymer flooding is a viscoelastic fluid. There exist both shear flow and elongational flow when the polymer solution flows in a porous medium, where an additional dissipation is involved. The additional dissipation caused by elongational deformation is often ignored while studying the flow of the fluid in a porous medium. For a complex polymer solution, the generated elongational pressure drop cannot be ignored. In a capillary of fixed diameter, the polymer solution is only impacted by the shear force, and its rheological property is pseudoplastic. Therefore the variable diameter capillary and the converging-diverging flow model with different cross sections are required to describe the flow characteristics of the polymer solution in porous media more accurately. When the polymer solution flows through the port, we have the elongational flow and the polymer molecules undergo elongational deformation elastically. By using the mechanical energy balance principle and the minimum energy principle, a mathematical model of non-Newtonian fluid inlet flow was established by Binding. On the basis of the Binding theory, with the application of the theory of viscoelastic fluid flow in the circular capillary and the contraction-expansion tube, the relations between the viscoelastic fluid flow rate and the pressure drop are obtained.

关键词： Binding theory viscoelastic fluid abrupt contraction capillary permeability rule

Molecular Dynamics Numerical Simulation of Adsorption Characteristics and Exploitation Limits in Shale oil Microscopic Pore Spaces

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Fluid Dynamics & Materials Processing 2024年第8期20卷 1915-1924页

作者： Guochen Xu Taizhou oil production plant Sinopec East China Oil and Gas CompanyTaizhou225300China

Microscopic pore structure in continental shale oil reservoirs is characterized by small pore throats and complex *** adsorption behavior of hydrocarbons on the pore walls exhibits unique physical and chemical ***,studying the adsorption morphology of hydrocarbon components in nanometer-sized pores and clarifying the exploitation limits of shale oil at the microscopic level are of great practical significance for the efficient development of continental shale *** this study,molecular dynamics simulations were employed to investigate the adsorption characteristics of various single-component shale oils in inorganic quartz fissures,and the influence of pore size and shale oil hydrocarbon composition on the adsorption properties in the pores was *** results show that different molecules have different adsorption capacities in shale oil pores,with lighter hydrocarbon components(C6H14)exhibiting stronger adsorption *** the same adsorbed molecule,the adsorption amount linearly increases with the increase in pore diameter,but larger pores contribute more to shale oil *** shale pores,the thickness of the adsorption layer formed by shale oil molecules ranges from 0.4 to 0.5 nm,which is similar to the width of alkane *** oil in the adsorbed state that is difficult to be exploited is mainly concentrated in the first adsorption *** them,the volume fraction of adsorbed shale oil in 6 nm shale pores is 40.8%,while the volume fraction of shale oil that is difficult to be exploited is 16.2%.

关键词： Shale oil utilization limit micro adsorption molecular dynamics simulation

Prediction Model of Wax Deposition Rate in Waxy Crude oil Pipelines by Elman Neural Network Based on Improved Reptile Search Algorithm

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Energy Engineering 2024年第4期121卷 1007-1026页

作者： Zhuo Chen Ningning Wang Wenbo Jin Dui Li The second oil production plant Sinopec Northwest Oilfield CompanyUrumqi830011China Yingmaili oil and Gas production Management Area PetroChina Tarim Oilfield CompanyKorla841001China College of Petroleum Engineering Xi’an Shiyou UniversityXi’an710065China

A hard problem that hinders the movement of waxy crude oil is wax deposition in oil *** ensure the safe operation of crude oil pipelines,an accurate model must be developed to predict the rate of wax deposition in crude oil *** at the shortcomings of the ENN prediction model,which easily falls into the local minimum value and weak generalization ability in the implementation process,an optimized ENN prediction model based on the IRSA is *** validity of the new model was confirmed by the accurate prediction of two sets of experimental data on wax deposition in crude oil *** two groups of crude oil wax deposition rate case prediction results showed that the average absolute percentage errors of IRSA-ENN prediction models is 0.5476% and 0.7831%,***,it shows a higher prediction accuracy compared to the ENN prediction *** fact,the new model established by using the IRSA to optimize ENN can optimize the initial weights and thresholds in the prediction process,which can overcome the shortcomings of the ENN prediction model,such as weak generalization ability and tendency to fall into the local minimum value,so that it has the advantages of strong implementation and high prediction accuracy.

关键词： Waxy crude oil wax deposition rate chaotic map improved reptile search algorithm Elman neural network prediction accuracy

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

Structural geometrical analysis and simulation of decollement growth folds in piedmont Fauqi Anticline of Zagros Mountains, Iraq

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Science China Earth Sciences 2016年第9期59卷 1885-1898页

作者： OU ChengHua CHEN Wei LI ChaoChun ZHOU WenJiang State Key Laboratory of oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University State-owned Asset Management Office Southwest Petroleum University Zhundong oil production plant Xinjiang Oilfield Company

This study carried out detailed structural analyses of the plane structural deformation pattern and sectional structural deformation styles of the Fauqi Anticline by the 3D seismic section with full cover collection, and carried out the kinematical simulation of the Fauqi anticlinal deep decollement coupling shallow growth folds and faults based on the fault decollement fold model and the forward balanced geological section technique. The study subsequently evaluated the differentiated petroleum enrichment mechanism of the Fauqi Anticline by utilizing the results of the structural analysis and combining the spatial-temporal relationship analysis of the source, the reservoir, and the caprock. The results showed that the differentiated plane structural deformation pattern and hierarchical sectional structural deformation style were developed by the superposed coupling of deep decollement, syntectonic sedimentation of shallow growth strata, and the compression of the south-west horizontal tectonic stress from the Zagros Mountains. It was found that the differentiated structural deformation caused the differentiated enrichment of petroleum in the Fauqi Anticline. It was also found that the horizontal slip distance of the Fauqi Anticlinal Folds reached around 3.5 km by the simulation of deep decollement coupling the movement of the shallow growth folds and the faults.

关键词： Fauqi Anticline Decollement Growth fold Geometrical analysis of structures Kinematical simulation Petroleum enrichment Zagros Mountains

Reservoir Characteristics of Fine-grained Sedimentary Rocks in Saline Lakes in the Cenozoic Upper Ganchaigou Formation,Southwestern Qaidam Basin,NW China

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 1070-1081页

作者： SHENG Jun LIU Jincheng LI Yunlong ZOU Haiyan LONG Anlin WANG Lin LI Jiyong QI Qingshan YANG Xiaojing LI Yanan Exploration&Development Research Institute of PetroChina Qinghai oilfield Company DunhuangGansu 736200China No.2 oil production plant of PetroChina Qinghai oilfield Company DunhuangGansu 736200China No.1 oil production plant of PetroChina Qinghai oilfield Company DunhuangGansu 736200China

Cenozoic fine-grained sedimentary rocks in the southwestern Qaidam Basin,as typical salinized lacustrine sediments,are significantly different from those in other freshwater lakes under the impact of the high salinity in the *** fine-grained sedimentary rock samples were selected from the lower member of Neogene(N_(1))in the Gaskule oilfield,Qaidam Basin,northwest China,with the aim to analyze and test their petrology,pore structure,and organic geochemical characteristics and determine its genesis and geological *** on previous results,a new genesis of mixed sedimentary rocks is *** Cenozoic lacustrine fine-grained sedimentary rocks in SW Qaidam Basin belong to mixed sedimentary rocks,which can be divided into three types,including carbonate and terrigenous clastic-bearing mudstone,carbonate-bearing to terrigenous clastic mixed sedimentary rocks,and carbonate-terrigenous clastic mixed sedimentary *** geneses of mixing are quite different from that of mixed marine *** to the sedimentary characteristics of the salinized lakes,three new geneses of mixed deposits are proposed:syn-sedimentary mixing,varve interbedded mixing,and biogenic *** reservoir spaces of the Cenozoic lacustrine fine-grained sedimentary rocks in SW Qaidam Basin include residual intergranular pores,intercrystalline pores,microfractures,and minor dissolved *** reservoirs have super-low porosity and ultra-low permeability,with a porosity of 1.82%-21.04%,averaging 7.71%,and permeability of(0.0028-254.86)×10^(−3)μm^(2),averaging 2.82×10^(−3)μm^(2).The test results of total organic carbon(TOC)content show that the highest content of organic carbon reached 1.41%,and those of vitrinite reflectance show that Ro ranges from 0.525%-0.824%,with an average of 0.806%.The organic geochemical characteristics show that the fine-grained mixed sedimentary rocks of SW Qaidam Basin have the potential for self-generation and *** an unconventional re

关键词： energy resources unconventional reservoir sedimentary petrology organic geochemistry salinization lacustrine sediments Neogene

Fracture Mechanism of the Formation with a Natural Flaw Under a Single-Tooth Cutting

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Acta Mechanica Solida Sinica 2020年第5期33卷 719-730页

作者： Siqi Li Wei Li Tie Yan Fuqing Bi Huan Zhao Xin Ling Institute of Petroleum Engineering Northeast Petroleum UniversityDaqing163318HeilongjiangChina The Fifth oil production plant of Daqing oilfield Daqing163513HeilongjiangChina

The process of a single-tooth cutting formation is taken as the representative to analyze the fracture mechanism of the formation with natural flaws under the PDC drill *** modeling of the stress field distribution of the formation under a single tooth is proposed ***,the modeling of the stress intensity factor K,T-stress and the initiation angleθof the flaw under two far-field compressive loads in two cases are presented based on the mode-II ***,the results of theoretical calculations and simulations are given and *** on the analysis undertaken,it can be concluded that the confinement ratioλapplying on the flaw changes nonlinearly with the variation inα+φ.The relationship between the dimensionless ratioβx/βy of T-stress and the rotational polar angleφis a parabola with an upward *** the direction of the cutting force is consistent with the flaw,the stress intensity factor K and the initiation angleθat the tip of the flaw reach the *** addition,the angle between the cutting force and the flaw weakens the T-stress and inhibits the crack initiation and propagation of the *** results of numerical simulations show good agreement with theoretical calculations.

关键词： Single-tooth cutting Stress field Stress intensity factor Initiation angle Extended finite element

A novel method for predicting breakthrough time of horizontal wells in bottom water reservoirs

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Journal of Central South University 2013年第12期20卷 3612-3619页

作者：李立峰岳湘安赵海龙杨志国张立娟 MOE Key Laboratory of Petroleum Engineering in China (University of Petroleum) 1st oil production plant of Jiangsu oilfield Company SINOPEC

Dimensional analysis and numerical simulations were carried out to research prediction method of breakthrough time of horizontal wells in bottom water reservoir. Four dimensionless independent variables and dimensionless time were derived from 10 influencing factors of the problem by using dimensional analysis. Simulations of horizontal well in reservoir with bottom water were run to find the prediction correlation. A general and concise functional relationship for predicting breakthrough time was established based on simulation results and theoretical analysis. The breakthrough time of one conceptual model predicted by the correlation is very close to the result by Eclipse with less than 2% error. The practical breakthrough time of one well in Helder oilfield is 10 d, and the predicted results by the method is 11.2 d, which is more accurate than the analytical result. Case study indicates that the method could predict breakthrough time of horizontal well under different reservoir conditions accurately. For its university and ease of use, the method is suitable for quick prediction of breakthrough time.

关键词： reservoirs with bottom water breakthrough time of horizontal well prediction method dimensional analysis numericalsimulation