Perforation quality is continuously puzzled by the accuracy of perforation depth.
如何提高射孔深度的精度一直是射孔质量控制的难题。
The purpose of perforation is penetrating the casing tube, cement sheath and a certain depth of the formation and forming unhindered channels for oil and gas flowing into the well casing.
射孔目的就是射穿套管、水泥环和地层内一定的深度，为地层的油气流入至井筒，形成一个顺畅的通道。
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；
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