Steam injection is a most effective way for improving heavy oil recovery efficiency, and it has academic and practical significance for the mechanism of multi-field synergy oil displacement. Mechanism of “diversified...Steam injection is a most effective way for improving heavy oil recovery efficiency, and it has academic and practical significance for the mechanism of multi-field synergy oil displacement. Mechanism of “diversified” oil displacement which is obtained by traditional study methods in the exploitation territory of oil and gas fields has both respective roles and mutual cross shortages. To describe and analyze the displacement process of multi-field coupling with exergy transfer can simplify this kind of problem by introducing a unified goal-driving exergy. It needs to use the method of theoretical modeling, numerical simulation and experimental validation to study the basic law of exergy transfer in the oil displacement process of multi-field synergy, make a thorough research for the flooding process of steam injection with exergy transfer theory and reveal the oil displacement mechanism in steam injection of multi-field synergy. Thus the theory instruction and technical support can be provided to improve reservoirs producing degree and extraction ratio.展开更多
For most strip-like plastic injection molded parts,whose cross section size is much smaller than their length,the traditional Hele-Shaw model and three-dimensional model do not work well in the prediction of the warpa...For most strip-like plastic injection molded parts,whose cross section size is much smaller than their length,the traditional Hele-Shaw model and three-dimensional model do not work well in the prediction of the warpage because of their special shape.A new solution was suggested in this work.The strip-like plastic part was regarded as a little-curved beam macroscopically,and was divided into a few one-dimensional elements.On the section of each elemental node location,two-dimensional thermal finite element analysis was made to obtain the nonuniform thermal stress caused by the time difference of the solidi fication of the plastic melt in the mold.The stress relaxation,or equivalently,strain creep was dealt with by using a special computing model.On the bases of in-mold elastic stress,the final bending moment to the beam was obtained and the warpage was predicted in good agreement with practical cases.展开更多
文摘Steam injection is a most effective way for improving heavy oil recovery efficiency, and it has academic and practical significance for the mechanism of multi-field synergy oil displacement. Mechanism of “diversified” oil displacement which is obtained by traditional study methods in the exploitation territory of oil and gas fields has both respective roles and mutual cross shortages. To describe and analyze the displacement process of multi-field coupling with exergy transfer can simplify this kind of problem by introducing a unified goal-driving exergy. It needs to use the method of theoretical modeling, numerical simulation and experimental validation to study the basic law of exergy transfer in the oil displacement process of multi-field synergy, make a thorough research for the flooding process of steam injection with exergy transfer theory and reveal the oil displacement mechanism in steam injection of multi-field synergy. Thus the theory instruction and technical support can be provided to improve reservoirs producing degree and extraction ratio.
基金Supported by the Key Program of National Natural Science Foundation of China(11432003)the Key Research Project for Henan Universities(15A430009)
文摘For most strip-like plastic injection molded parts,whose cross section size is much smaller than their length,the traditional Hele-Shaw model and three-dimensional model do not work well in the prediction of the warpage because of their special shape.A new solution was suggested in this work.The strip-like plastic part was regarded as a little-curved beam macroscopically,and was divided into a few one-dimensional elements.On the section of each elemental node location,two-dimensional thermal finite element analysis was made to obtain the nonuniform thermal stress caused by the time difference of the solidi fication of the plastic melt in the mold.The stress relaxation,or equivalently,strain creep was dealt with by using a special computing model.On the bases of in-mold elastic stress,the final bending moment to the beam was obtained and the warpage was predicted in good agreement with practical cases.
