The flow rate, perforation radius and shot density are the key parameters influencing the pressure drop across gravel pack.
分析结果还表明，油井产量以及射孔孔径和孔密度是影响砾石层压降的重要因素。
Discusses the importance and design scheme of perforating charges with large diameter and perforating guns with high shot density;
描述了大孔径射孔弹和高孔密射孔枪系统的设计；
The shot diameter, shot density and shot phasing related to the collapsing strength coefficient are analyzed, and the result is helpful to the perforation optimum design.
利用推导的抗挤强度系数理论公式分析孔径、孔密及相位角的变化对其抗挤强度系数的影响，其结果为优化射孔设计提供了简便的方法。
Based on the analysis of the perforation applicability, sand production mechanism of formations, and sand control methods in production, a new method of sand control using high shot density was given.
对射孔器和射孔器适用性，地层出砂机理以及目前现场使用的各种防砂方式进行分析，提出了利用高孔密射孔进行防砂的思路。
In Johannesburg, the exact same shot would either fly over the crossbar or hit the wall, as the lower air density reduces both drag and the effect of spin.
在约翰内斯堡，完全相同的射击既可能比球门飞得高也可能撞到人墙，因为更低的空气密度既降低了拖曳力也降低了旋转效应。
In Johannesburg, the exact same shot would either fly over the crossbar or hit the wall, as the lower air density reduces both drag and the effect of spin.
在约翰内斯堡，完全相同的射击既可能比球门飞得高也可能撞到人墙，因为更低的空气密度既降低了拖曳力也降低了旋转效应。
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