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。
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