Gas well deliverability evaluation and analysis are challenging due to the frequent abnormalities of deliverability test data of gas condensate wells caused by seepage of oil and gas phases in the reservoirs.To this e...Gas well deliverability evaluation and analysis are challenging due to the frequent abnormalities of deliverability test data of gas condensate wells caused by seepage of oil and gas phases in the reservoirs.To this end,based upon the pseudo-single-phase seepage equation and the oilegas two-phase seepage equation,a new deliverability evaluation method was established which is applicable to the following two cases when the flow of a gas well reaches the quasi-steady stage,i.e.,the pseudo-single-phase stable point deliverability evaluation for the case when the formation pressure is above the dew pressure;the gaseliquid two-phase stable point deliverability evaluation for the case when the formation pressure is below the dew pressure.Using this established deliverability evaluation method,based on the basic parameters of the Yaha gas field,Tarim Basin,the IPR curves were first obtained of gas wells do not get this at the same production gaseoil ratio and at the formation pressure above and below the dew point pressure;then,according to the four condensate gas fields,such as Yaha,Tazhong I,Qianmiqiao and Dina 2,the absolute open flow(AOF)potentials of condensate gas wells under different gaseoil production ratios were calculated.Finally,through statistical analysis of the calculation results from typical wells,the following findings were obtained.This new deliverability evaluation method under the two states of condensate gas wells with quasi-single-phase and gaseliquid two-phase stable points can be used to avoid cases due to the oilegas flow in a condensate gas well which has remained unresolved by the classical deliverability evaluation methods.Also,with the increase of gaseoil ratios in gas condensate wells,a variable discrepancy is gradually reduced in AOF potentials calculated respectively by the quasi-single-phase and gaseliquid two-phase stable point deliverability evaluation equations.For the condensate gas wells with high condensate content and low condensate gas production rates,the AOF potentials calculated by the gaseliquid two-phase stable point deliverability equation is more appropriate and reliable compared with that obtained by classical methods.展开更多
Expressway reconstruction and expansion projects are becoming increasingly important in China’s infrastructure construction.Traffic management is pivotal for maintaining con-struction progress and ensuring constructi...Expressway reconstruction and expansion projects are becoming increasingly important in China’s infrastructure construction.Traffic management is pivotal for maintaining con-struction progress and ensuring construction progress,traffic efficiency,and traffic safety.Route guidance is a key method of traffic diversion,but its diversion effectiveness is often difficult to be predicted.This paper proposes a method to analyze the effectiveness of route guidance in expressway reconstruction and expansion projects in China.First,evolutionary game theory is employed to build a decision-making model for drivers facing the route guidance recommendations.Replicated dynamic equation is used to reveal the evolution-ary law of driver decision-making over time.Secondly,the cost matrix is quantified based on the typical conditions of expressway reconstruction and expansion practices in China.Thirdly,the evolutionary stable points are solved and analyzed.The results indicate that two types of stable points emerge in evolutionary games under route guidance.The first type arises when the detour coefficient of the receiving road is excessively high or the road and traffic conditions are exceptionally poor,resulting in an evolutionary stable point of 0,which indicates route guidance failure.The second type occurs when the detour coefficient of the receiving road is relatively low and the road and traffic conditions are good,resulting in an evolutionary stable point between 0 and 1,indicating that route guidance will impact only a subset of drivers.Finally,numerical analysis of results under different parameter values is conducted,and the application value of the research conclusion in expressway reconstruction and expansion is discussed.展开更多
The escalating ecological consequences of state transitions have attracted significant attention in both theoretical and experimental studies,with a focus on determining the stable or equilibrium points of dynamic sys...The escalating ecological consequences of state transitions have attracted significant attention in both theoretical and experimental studies,with a focus on determining the stable or equilibrium points of dynamic systems[1-5].Identifying equilibrium states not only reveals a system's current status but also offers insights into its evolutionary trajectory under specific environmental conditions[6].展开更多
基金supported by the PetroChina Major Science and Technology Project(No.2014E-3203)。
文摘Gas well deliverability evaluation and analysis are challenging due to the frequent abnormalities of deliverability test data of gas condensate wells caused by seepage of oil and gas phases in the reservoirs.To this end,based upon the pseudo-single-phase seepage equation and the oilegas two-phase seepage equation,a new deliverability evaluation method was established which is applicable to the following two cases when the flow of a gas well reaches the quasi-steady stage,i.e.,the pseudo-single-phase stable point deliverability evaluation for the case when the formation pressure is above the dew pressure;the gaseliquid two-phase stable point deliverability evaluation for the case when the formation pressure is below the dew pressure.Using this established deliverability evaluation method,based on the basic parameters of the Yaha gas field,Tarim Basin,the IPR curves were first obtained of gas wells do not get this at the same production gaseoil ratio and at the formation pressure above and below the dew point pressure;then,according to the four condensate gas fields,such as Yaha,Tazhong I,Qianmiqiao and Dina 2,the absolute open flow(AOF)potentials of condensate gas wells under different gaseoil production ratios were calculated.Finally,through statistical analysis of the calculation results from typical wells,the following findings were obtained.This new deliverability evaluation method under the two states of condensate gas wells with quasi-single-phase and gaseliquid two-phase stable points can be used to avoid cases due to the oilegas flow in a condensate gas well which has remained unresolved by the classical deliverability evaluation methods.Also,with the increase of gaseoil ratios in gas condensate wells,a variable discrepancy is gradually reduced in AOF potentials calculated respectively by the quasi-single-phase and gaseliquid two-phase stable point deliverability evaluation equations.For the condensate gas wells with high condensate content and low condensate gas production rates,the AOF potentials calculated by the gaseliquid two-phase stable point deliverability equation is more appropriate and reliable compared with that obtained by classical methods.
基金supported by the Science and Technology Plan of Shandong Transportation Department(No.2021B47)Science and Technology Research Project of Jiangxi Education Department(No.GJJ2200666).
文摘Expressway reconstruction and expansion projects are becoming increasingly important in China’s infrastructure construction.Traffic management is pivotal for maintaining con-struction progress and ensuring construction progress,traffic efficiency,and traffic safety.Route guidance is a key method of traffic diversion,but its diversion effectiveness is often difficult to be predicted.This paper proposes a method to analyze the effectiveness of route guidance in expressway reconstruction and expansion projects in China.First,evolutionary game theory is employed to build a decision-making model for drivers facing the route guidance recommendations.Replicated dynamic equation is used to reveal the evolution-ary law of driver decision-making over time.Secondly,the cost matrix is quantified based on the typical conditions of expressway reconstruction and expansion practices in China.Thirdly,the evolutionary stable points are solved and analyzed.The results indicate that two types of stable points emerge in evolutionary games under route guidance.The first type arises when the detour coefficient of the receiving road is excessively high or the road and traffic conditions are exceptionally poor,resulting in an evolutionary stable point of 0,which indicates route guidance failure.The second type occurs when the detour coefficient of the receiving road is relatively low and the road and traffic conditions are good,resulting in an evolutionary stable point between 0 and 1,indicating that route guidance will impact only a subset of drivers.Finally,numerical analysis of results under different parameter values is conducted,and the application value of the research conclusion in expressway reconstruction and expansion is discussed.
基金supported by the funds from the National Natural Science Foundation of China(42041005 and 32101313)the CAS Strategic Priority Research Programme(A)(XDA20050103)Science&Technology Fundamental Resources Investigation Program(2022FY100100)。
文摘The escalating ecological consequences of state transitions have attracted significant attention in both theoretical and experimental studies,with a focus on determining the stable or equilibrium points of dynamic systems[1-5].Identifying equilibrium states not only reveals a system's current status but also offers insights into its evolutionary trajectory under specific environmental conditions[6].
