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动力压井法是一种非常规井控技术，在动力压井过程中利用井内或环空流体的流动阻力和静液压力来平衡喷井的地层压力，它已在压制强烈井喷中成功使用。文章介绍了确定动力压井所需流量的3种方法：在纯摩阻法计算模型中用单一流体计算流动压降；稳态两相模型表征稳态条件下的流体流动，并考虑两相流体在温度、压力变化条件下的压缩性；瞬态两相流动模型计算泵入压井液过程中两相邻时间段的井底压力变化。不断增加的静液压力与流动阻力加大了对地层的压力,分析与计算结果表明：两相流动模型优于单一流体的纯摩阻计算法。当压井管柱底端不在井底时，可以使用离井底动力压井法。在注入点处压井液液滴的沉降与液体回流是该方法压井成功的关键，因为它们能够增加对井底的有效压力。液滴的最大直径和牵引系数是判断沉降与回流的依据,最大液滴直径可据Weber数确定，而牵引系数是滑脱速度雷诺数的函数。压井液在上升天然气气流中碎裂成液滴是一个由空气动力学与流体力学所决定的复杂过程,尚需进一步研究以得出能更精确地确定离井底动力压井作业中液体回流的条件。

Research on Dynamic Kill Method

Dynamic kill method is an unconventional well control technique. The formation pressure in blowout well can be balanced by the flow resistance of fluids in well bore or annular space and the hydrostatic pressure in the course of dynamic kill. It has been successfully used in con trolling intense well blowout. Three methods of determining the flow rate necessary for dynamic kill are introduced in the paper, i. e. in pure friction calculation model, the single phase fluid is used for calculating flowing pressure; the steady-state two-phase model indicates the fluid flow under stationary condition, in which the compressibility of the two-phase fluid at the change in temperature and pressure is con sidered; and the change in BHP between two successive time intervals in the process of pumping-in killing fluid may be calculated by use of the transient two-phase flow model. The bottom hole flowing pressure increases because of the in crease in the hydrostatic pressure and flow resistance. Through analysis and calculation, it was indicated that the two-phase flow model is better than the pure friction calcula tion model; when the end of killing string is off the bottom hole, the off-bottom dynamic kill method can be used; the kill fluid droplet settling and fluid reflex at the point of injec tion are the key for a successful off-bottom dynamic kill, be cause they can make the BHP's being effectively increased; and the maximum diameter of droplet and drag efficiency are the basis of identifying the settling and reflux, the former being able to be determined by Weber number and the latter being a function of Reynolds number of slip velocity. The breakup of killing fluid into droplets in uplifting natural gas stream is a complicated process controlled by aerodynamics and fluid mechanics, which must be still further studied so as to determine more accurately the fluid reflux conditions in off-bottom dynamic kill operation.