通常解决连续管在井下遇卡的方法是大力拉拔,断脱后分段打捞,这样易造成连续管报废,同时施工程序复杂且周期较长。为此,研发了热熔式连续管内切割技术。该技术通过电缆将工具下入连续管内卡点附近,通过电缆传输大于500 m A的电流,触发...通常解决连续管在井下遇卡的方法是大力拉拔,断脱后分段打捞,这样易造成连续管报废,同时施工程序复杂且周期较长。为此,研发了热熔式连续管内切割技术。该技术通过电缆将工具下入连续管内卡点附近,通过电缆传输大于500 m A的电流,触发热能发生器内的电热头电阻,产生的热量引燃高能燃料剂,产生高压和强热使其内粒子热运动加剧,进而使所有原子全部电离,利用熔断性进行作业。现场应用结果表明,热熔式内切割工艺解决了连续管遇卡管柱小管径、强弹性、大韧性和无法旋转等打捞难题;避免了大力拉拔和活动解卡带来的连续管塑性变形和屈曲变形等不可逆转的损伤。热熔式内切割工艺为打捞小直径遇卡管柱拓展了思路和方法。展开更多
According to the features of melting process of regenerative aluminum melting furnaces, a three-dimensional mathematical model with user-developed melting model, burner reversing and burning capacity model was establi...According to the features of melting process of regenerative aluminum melting furnaces, a three-dimensional mathematical model with user-developed melting model, burner reversing and burning capacity model was established. The numerical simulation of melting process of a regenerative aluminum melting furnace was presented using hybrid programming method of FLUENT UDF and FLUENT scheme based on the heat balance test. Burner effects on melting process of aluminum melting furnaces were investigated by taking optimization regulations into account. The change rules of melting time on influence factors are achieved. Melting time decreases with swirl number, vertical angle of burner, air preheated temperature or natural gas flow; melting time firstly decreases with horizontal angle between burners or air-fuel ratio, then increases; melting time increases with the height of burner.展开更多
文摘通常解决连续管在井下遇卡的方法是大力拉拔,断脱后分段打捞,这样易造成连续管报废,同时施工程序复杂且周期较长。为此,研发了热熔式连续管内切割技术。该技术通过电缆将工具下入连续管内卡点附近,通过电缆传输大于500 m A的电流,触发热能发生器内的电热头电阻,产生的热量引燃高能燃料剂,产生高压和强热使其内粒子热运动加剧,进而使所有原子全部电离,利用熔断性进行作业。现场应用结果表明,热熔式内切割工艺解决了连续管遇卡管柱小管径、强弹性、大韧性和无法旋转等打捞难题;避免了大力拉拔和活动解卡带来的连续管塑性变形和屈曲变形等不可逆转的损伤。热熔式内切割工艺为打捞小直径遇卡管柱拓展了思路和方法。
基金Project(2009bsxt022)supported by the Dissertation Innovation Foundation of Central South University,ChinaProject(07JJ4016)supported by Natural Science Foundation of Hunan Province,ChinaProject(U0937604)supported by the National Natural Science Foundation of China
文摘According to the features of melting process of regenerative aluminum melting furnaces, a three-dimensional mathematical model with user-developed melting model, burner reversing and burning capacity model was established. The numerical simulation of melting process of a regenerative aluminum melting furnace was presented using hybrid programming method of FLUENT UDF and FLUENT scheme based on the heat balance test. Burner effects on melting process of aluminum melting furnaces were investigated by taking optimization regulations into account. The change rules of melting time on influence factors are achieved. Melting time decreases with swirl number, vertical angle of burner, air preheated temperature or natural gas flow; melting time firstly decreases with horizontal angle between burners or air-fuel ratio, then increases; melting time increases with the height of burner.