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1.Flow Characteristic of Aqueous Dispersion System of Nano/micron-sized Polymer Particles Through Microporous Membrane

作  者: LIU Qipeng 1, JING Hong 1, YANG Baisong 2, LONG Yunqian 3, SONG Fuquan 3
出  处: Proceedings of The 4th International Symposium —Multi-field Coupling Theory of Rock and Soil Media and its Applications (2018)
书  号: 978-0-9924140-4-7
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发表日期: 2014年05月
关 键 词: Nano/micron-sized polymer particles, Microporous membrane, Flow characteristic, Plugging, Deep profile control
摘  要: To evaluate percolation ability of aqueous dispersion system of nano/micron-sized polymer particles in porous media, the flow characteristic and its influence factors were studied by laser particle size analyzer and filtration device of microporous membranes which were simulated to reservoir pore throat. The results show that at the same hydration time, plugging capacities of nano/micron-sized polymer particles gradually increase as their average particle sizes increasing; at the different hydration time, plugging capacities of nano/micron-sized polymer particles show a trend of increasing first and then decreasing with increasing average particle sizes. With increasing pressure differentials, the plugging capacities of nano/micron-sized polymer particles gradually decrease and their deep profile control capacities gradually increase. When pore sizes of microporous membrane decrease, the plugging capacities of nano/micron-sized polymer particles rapidly increase and their deep profile control capacities quickly decrease. When the particle concentrations increasing, the plugging capacities of nano/micron-sized polymer particles increase and their deep profile control capacities decrease.

2.Coupled Analysis of Thermo-Hydro-Mechanical Field for Huashixia Roadbed

作  者: LIU Naifei 1, 2, LI Ning 1, 2, WANG Liping 1, XU Shuanhai 3
出  处: Proceedings of The 4th International Symposium —Multi-field Coupling Theory of Rock and Soil Media and its Applications (2019)
书  号: 978-0-9924140-4-7
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发表日期: 2014年05月
关 键 词: Coupled model, Thermo-hydro-mechanical, Roadbed, Numerical result, Measured data
摘  要: Multi-field coupling is one of the important forward subjects in geotechnical engineering and the coupled analysis of thermo-hydro-mechanical field is one of the most important parts of the multi-field coupling. Based on the thermo-hydro-mechanical coupling model for frozen soil and the 3G2012 software developed by the coupling theory, the temperature field, deformation field and stress field are investigated in this paper and the numerical results has been compared with the measured data which are well agreed with each other. The results indicated that the deformation of roadbed can be divided into two parts: frost heaving and thaw-settlement. Frost heaving period is from middle of November to next April and thaw-settlement period is from the beginning of May to the next beginning of November. This research result has directive significance to the similar project.

3.Research of Composite Oil Displacement Effect of Ma 20

作  者: LIU Yikun, YANG Ming, FAN Meng, WANG Xueming, WANG Fengjiao
出  处: Proceedings of The 4th International Symposium —Multi-field Coupling Theory of Rock and Soil Media and its Applications (2020)
书  号: 978-0-9924140-4-7
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发表日期: 2014年05月
关 键 词: Interfacial tension, Viscoelasticity, Surfactant/polymer system, Displacement characteristics
摘  要: This paper selected the Daqing Refining & Chemical polymer whose relative molecular mass is 1,900?04, the concentration of the polymer solution is 1,500mg/L, the SS (petroleum sulfonate) alkali free binary system, and the sodium carbonate ternary system are concentration components to achieve ultra-low interfacial tension, and on this basis the viscoelastic properties, viscosity and oil displacement experiments were simulated. Research shows that the concentration of the surfactant in ASP system is 0.3%, the alkali concentration is 1.2%, and the interfacial tension can reach 10-3mN/m; surfactant concentration of the binary system is 0.3%, which can reach 10-3mN/m. Because of the absence of alkali, the viscoelastic properties of the monomer are higher than that of the composite system. In the composite systems, elastic properties of the binary system are better than the ternary system. Artificial heterogeneous oil displacement experiment results show that recovery rate of the alkali free binary system reached 30.1%, which is 6.7 percentage points higher than the single polymer, and 2.7 percentage points higher than the ASP composite system.

4.Chromatographic Separation and Its Effect on the Efficient Length of ASP Slug

作  者: YAO Tongyu 1, LI Jishan 2
出  处: Proceedings of The 4th International Symposium —Multi-field Coupling Theory of Rock and Soil Media and its Applications (2021)
书  号: 978-0-9924140-4-7
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发表日期: 2014年05月
关 键 词: ASP flooding, Chromatographic separation, Multiple adsorption factors, Efficient length
摘  要: Because of the different adsorptions and different mass transfer rules of each chemical, chromatography separation is very serious, resulting in high interfacial tension and low recovery of ASP flooding, so laboratory experiments were conducted to study the chromatography separation. Results show that the concentration changes (c/c0) of different chemicals are different: the c/co of polymer decreases most slowly, while that of surfactant decreases fastest. The slug of the ASP is longer, the chromatography separation is weaker, and the interfacial tension is lower. According to interfacial tension, the efficient length of ASP slug is discussed, and the longer slug has larger efficient length. 

5.Effect Study of Cr3+ on Polymer Molecular Aggregate and Seepage Flow Characteristics

作  者: LU Xiangguo1, WANG Rongjian1, CHEN Xin1, LIU Yigang2
出  处: Proceedings of The 4th International Symposium —Multi-field Coupling Theory of Rock and Soil Media and its Applications (2022)
书  号: 978-0-9924140-4-7
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发表日期: 2014年05月
关 键 词: Polymer, Organic chromium, Aggregate, Permeability characteristics, Mechanism analysis
摘  要: Bohai oilfield is characterized by thick layers, high average permeability, serious heterogeneity, high viscosity crude oil and injection water salinity, which resulted in poor water-flooding recovery. So there is an urgent need to take new technologies to improve the water-flooding efficiency. Based on the theories of reservoir engineering, physical chemistry and polymer materials, by means of chemical analysis, instrumental detection and physical modeling, set evaluating indicators of polymer molecular aggregate, viscosity, resistant coefficient and residual resistance factor, set the LD10-1 oilfield reservoir conditions as the study object, conduct performance evaluation and mechanism analysis of the “salt-resistant” polymer solution and the “high molar mass” Cr3+ polymer gel. The results showed that at the early time of adding cross-linking agents to the polymer solution, Cr3+ mainly leads to the cross-linking reaction of different branches (carboxyl) on the same polymer molecular chain. Polymer molecular chains in the polymer gel are mainly “local reticular” aggregate. At that time, polymer molecular clew dimension increase is not big, and the viscosity hardly increases. As time went on, Cr3+ begins to actuate the cross-linking reaction among branched chains (carboxyl) on different polymer molecules, and polymer molecule chains in the polymer gel are mainly “local reticular” aggregate, the viscosity increases prominently, and its compatibility with the oil reservoir becomes poor. Compared with the molecular chain in the salt-resistant polymer solution presenting “linear and branched” aggregate, flexibility of the “local reticular” aggregate in the Cr3+ polymer gel becomes weak, and its rigidity increases, which showed excellent fluid steering capability. What’s more, when Cr3+ polymer gel was diluted by injected water, its molecular clew dimension would increase, and its blocking effect to rock pore was enhanced, which made the residual resistance factor higher than the resistance factor, and showed peculiar permeability characteristics from common polymer solution.

6.Research on Coupling Law of Stress Field-Seepage Field Between Oil and Water Phase in Gaoqianbei Oil Field

作  者: WU Junxian
出  处: Proceedings of The 4th International Symposium —Multi-field Coupling Theory of Rock and Soil Media and its Applications (2023)
书  号: 978-0-9924140-4-7
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发表日期: 2014年05月
关 键 词: Gaoqianbei oil field, Seepage field, Stress field, Fluid-solid coupling, Mathematical model, Numerical simulation
摘  要: On the basic theory of rock mechanics, permeation fluid mechanics, geomechanics and computational mechanics, the mathematical model of stress field-seepage field coupling between oil and water phase in the porous media is established. The coupling law of stress field-seepage field between oil and water phase in Gaoqianbei oil field is researched with ANSYS. The result shows that the strain of reservoir rock affects the production performance in two aspects. Firstly, the rock contraction affected by the descend of fluid pressure in pores increases the energy of elastic-driving, which is benefit for enhancing oil recovery; secondly, the rock contraction destroys the pore structure of rock, reduce the ability of seeping and oil accumulating, being harm for production performance. The most important is that the influence affected by rock contraction is serious than elastic energy. The descendent of permeability and pore because of coupling make the production a decrease in various degrees, comparing with non-coupling model. So we must analyze the adverse effect on the production because of coupling effect and draft corresponding production measures, in order to decrease the changing velocity of drawdown pressure and ensure the extent of the damage of the ability of seeping and oil accumulating is the minimum. This paper is the finite element analysis of coupling law of stress field / seepage field in permeable stratum medium.

7.Experimental Study on the Law for Permeability of Coal Bed Methane Considering Coupling Effect of Heat and Stress

作  者: LIU Jie, ZHANG Yongli, SU Chang, ZHANG Yao, CUI Hongda, CAO Zhu
出  处: Proceedings of The 4th International Symposium —Multi-field Coupling Theory of Rock and Soil Media and its Applications (2024)
书  号: 978-0-9924140-4-7
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发表日期: 2014年05月
关 键 词: Permeability, Heat, Stress, Coupling effect
摘  要: The law for permeability of coal body containing methane considering coupling effect of heat and stress has been experimentally researched in this article. Permeability measurement experiment has been done under different axial compression, confining pressure, pore pressure, and temperature by using the Triaxial Permeameter. Through analysis of the experimental results, the permeability of coal presents an increasing trend with the increase of pore pressure, and the increasing trend is more significant with the increase of temperature; the permeability of coal presents a decreasing tendency with the increase of effective stress, and the decreasing tendency is more significant with the increase of the temperature.

8.Study on the Productivity of Multi-fractured Horizontal Wells in Ultra-Low Permeability Reservoirs

作  者: YANG Chuncheng 1, XU Ziyi 2, YIN Chao 3, ZHONG Huiying 1, YIN Hongjun 1
出  处: Proceedings of The 4th International Symposium —Multi-field Coupling Theory of Rock and Soil Media and its Applications (2025)
书  号: 978-0-9924140-4-7
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发表日期: 2014年05月
关 键 词: Multi-fractured horizontal wells, Ultra-low permeability, Threshold pressure gradient, Productivity
摘  要: Based on the equivalent radius model, a productivity model for ultra-low permeability reservoirs was developed, which considered the influence of the threshold pressure gradient and the variable mass flow in fractures, and the effect of threshold pressure gradient, fracture number, fracture half-length, fracture angel, and fracture distribution on the productivity were analyzed. The results show that the greater the threshold pressure gradient, the greater the effect of it on multi-fractured horizontal well productivity, so the threshold pressure gradient must be accounted to evaluate the productivity in ultra-low permeability reservoirs. With the increase of fracture number, fracture half-length and fracture angel, the productivity increases. In order to obtain higher productivity, the angle between the fracture and horizontal well should be between 75 and 90 degree. When the total half-length of the fracture is certain, reducing the fracture interference, the length of the outer fractures should be bigger than that among the inner fractures. The research results provide a scientific basis for the design of multi- fractured horizontal wells in ultra-low permeability reservoirs.

9.Research on the Fatigue Life of the Wellbore of the Underground Gas Storage Well With Surface Pit Defects

作  者: XIA Rui 1, DONG Shier 1, YANG Dezhi 2, LYU Hengfu 3
出  处: Proceedings of The 4th International Symposium —Multi-field Coupling Theory of Rock and Soil Media and its Applications (2026)
书  号: 978-0-9924140-4-7
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发表日期: 2014年05月
关 键 词: CNG, Underground gas well, Fatigue life, Pit defect, Numerical analysis
摘  要: This paper establishes an appropriate finite element model according to the structure and operating characteristics of gas wells, and then conducts fatigue analysis to wellbore casing containing pit defects. The results show that the fatigue life of the outer surface is slightly longer than that of the inner surface when the pit depth Z is less than 5mm, but both are the same when Z is greater than 5mm. Furthermore, for pits with equal sharpness (the ratio of long axis to depth 2X/Z is equivalent), degree of fatigue failure will be greater if the ratio of depth to wall-thickness ratio (Z/B) is larger. It gives suggestion to define that 2X/Z of shrill pit greater than that of 1.5, Z/B which is greater than 0.6 is a dangerous pit as the judgment standard of critical defects in wellbore detection projects, which provides the basis for the next amendment of specification (SY/T6535-2002).

10.Minimizing Subsurface Geological Uncertainties Using 4-D Seismic Time Lapse Application: A Breakthrough Method for Production Optimization and Water Flooding Surveillance in Widuri Field, Asri Basin, Southeast Sumatera, Indonesia

作  者: SUN Pengxiao, Dwandari Ralanarko, Julius Sunarta
出  处: Proceedings of The 4th International Symposium —Multi-field Coupling Theory of Rock and Soil Media and its Applications (2027)
书  号: 978-0-9924140-4-7
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发表日期: 2014年05月
关 键 词: Production optimization, Water flooding, 4D seismic time lapse
摘  要: Widuri field, one of the major mature fields in South East Sumatra (SES) block, has a cumulative oil production up to 357 MMBO. There are several productive reservoirs, mainly in Talang Akar Formation (TAF). These reservoirs are generally classified into two types of drive mechanism, i.e. water drive and depletion drive. Current recovery factor in depletion drive reservoir is not optimum, and needs to be increased by IOR. Water flooding is one of the effective methods to overcome pressure depletion by injecting water to the reservoir. Water flooding, a very common method of secondary recovery, will improve oil reservoir sweep efficiency and eventually increase reservoir recovery factor. One of challenge in water flooding is establishing reservoir uniformity, connectivity and fluid content. This obstacle can be solved using time lapse 4D seismic. Time lapse 4D seismic has been applied to be effective for monitoring pressure decrease and subsequent water flooding sweep patterns. Practically, this method is used to map differences in seismic response over time attributable to production related processes, especially amplitude response which directly interpreted as replacement of oil by dissolved gas, and also indicating re-pressuring at the reservoir. Comprehensive analysis of time lapse 4D seismic has been well implemented for increasing in fill and injector success ratio, as well as predominating pressure degradation in Widuri field.
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