Chokes are one of the most important components of downhole flow-control equipment. The particle erosion mathematical model, which considers particle-particle interaction, was established and used to simulate solid pa...Chokes are one of the most important components of downhole flow-control equipment. The particle erosion mathematical model, which considers particle-particle interaction, was established and used to simulate solid particle movement as well as particle erosion characteristics of the solid-liquid two-phase flow in a choke. The corresponding erosion reduction approach by setting ribs on the inner wall of the choke was advanced. This mathematical model includes three parts： the flow field simulation of the continuous carrier fluid by an Eulerian approach, the particle interaction simulation using the discrete particle hard sphere model by a Lagrangian approach and calculation of erosion rate using semiempirical correlations. The results show that particles accumulated in a narrow region from inlet to outlet of the choke and the dominating factor affecting particle motion is the fluid drag force. As a result, the optimization of rib geometrical parameters indicates that good anti-erosion performance can be achieved by four ribs, each of them with a height （H） of 3 mm and a width （B） of 5 mm equaling the interval between ribs （L）.展开更多
In article the expediency of application of methods of protection soils from erosion and in general principles of the antierosion organization of territory of land tenure for adaptation of territories to changes of a ...In article the expediency of application of methods of protection soils from erosion and in general principles of the antierosion organization of territory of land tenure for adaptation of territories to changes of a climate is considered.The expediency of updating of these methods in connection with new results of supervision for runoff on slopes and the new purposes of their application is shown.In particular,it is shown,that antierosion constructions need to be placed above a place of concentration of a runoff,instead of on it as the probability of destruction of a construction in this place is great.Application the soil-water-security systems of agriculture provides regulation of a microclimate of territory(reduction of warming up of a surface),allows to lower peak of a high water from downpours,translating a part of a superficial runoff in intrasoil and underground and to these to prevent losses from them including loss of a fertile layer of soils,saturation by a moisture of a zone of aeration favorably influences development of forest vegetation and agricultural crops.展开更多
基金supported by the Fund of Innovation Research Group of National Natural Science Foundation of China (Grant NO.5052160450323001)Major Program of National Natural Science Foundation of China (Grant No.50536020)
文摘Chokes are one of the most important components of downhole flow-control equipment. The particle erosion mathematical model, which considers particle-particle interaction, was established and used to simulate solid particle movement as well as particle erosion characteristics of the solid-liquid two-phase flow in a choke. The corresponding erosion reduction approach by setting ribs on the inner wall of the choke was advanced. This mathematical model includes three parts： the flow field simulation of the continuous carrier fluid by an Eulerian approach, the particle interaction simulation using the discrete particle hard sphere model by a Lagrangian approach and calculation of erosion rate using semiempirical correlations. The results show that particles accumulated in a narrow region from inlet to outlet of the choke and the dominating factor affecting particle motion is the fluid drag force. As a result, the optimization of rib geometrical parameters indicates that good anti-erosion performance can be achieved by four ribs, each of them with a height （H） of 3 mm and a width （B） of 5 mm equaling the interval between ribs （L）.
文摘In article the expediency of application of methods of protection soils from erosion and in general principles of the antierosion organization of territory of land tenure for adaptation of territories to changes of a climate is considered.The expediency of updating of these methods in connection with new results of supervision for runoff on slopes and the new purposes of their application is shown.In particular,it is shown,that antierosion constructions need to be placed above a place of concentration of a runoff,instead of on it as the probability of destruction of a construction in this place is great.Application the soil-water-security systems of agriculture provides regulation of a microclimate of territory(reduction of warming up of a surface),allows to lower peak of a high water from downpours,translating a part of a superficial runoff in intrasoil and underground and to these to prevent losses from them including loss of a fertile layer of soils,saturation by a moisture of a zone of aeration favorably influences development of forest vegetation and agricultural crops.
