Single cylinder core, can be installed into the mould directly, require smoothness at the connection with the cylinder, high requirement of the hole drilling, smaller volume.
单独气缸芯子，直接安装到模具里面，要求与气缸接触处光滑，开孔要求比较高，体积比较小。
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。
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