The relationships among perforation diameter, density, phase and casing strength are clarified.
明确了射孔直径、密度及相位等与套管强度的关系。
The result indicates that the initiation fracture pressure can be obviously reduced by raising the perforation diameter and depth;
计算结果发现，增加射孔直径、深度可以显著降低起裂压力；
The perforation diameter, speed as well as the power supply required are closely related to physical and mechanical properties of soil stratum.
它的穿孔直径和穿孔速度所需动力都与土层的各种物理力学参数有密切关系。
The technology uses deep penetration perforation charge with high perforation density and large perforation diameter and surging perforation with greater pressure differential.
它采用高孔密大孔径深穿透射孔弹和大压差抽吸炮眼清洗技术，不仅能提高油井产能，解除近井带污染，还可以改善防砂完井效果。
The law conversation of energy and the hole diameter formula of jet perforating are employed to deduce the relationship of diameter and velocity of jet for cylindrical hole of perforation concrete.
文中根据能量守恒原理及侵彻孔径公式，推导了获得圆柱形穿孔的射流直径与速度的关系。
The minimum injection rate of gravel pack increases while increasing the diameter of perforation tune, the perforation density, the perforated thickness and the critical velocity.
射孔密度、射开厚度、孔眼直径及临界流速增加时，砾石充填最小排量也增加。
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。
The perforations have a relatively large diameter and the perforation tunnel is deep.
射孔孔眼具有相对较大的直径，而且射孔孔道很深。
The perforations have a relatively large diameter and the perforation tunnel is deep.
射孔孔眼具有相对较大的直径，而且射孔孔道很深。
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