When 20 "casing depth is attained, displace hole volume with high viscosity mud."
钻达20英寸套管深度时，用高粘度泥浆替满井眼。
Traditional design methods and design methods to improve integration of the two design and comparison of results are given every reasonable under the casing depth interval.
将传统设计方法与改进设计方法结合，并将两个设计结果进行比较，给出每层套管的合理下入深度区间。
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。
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