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套管内侧钻中短半径水平井，由于造斜率比常规的中半径水平井要高得多（１°／ｍ 以上） ；因此，结构弯角必然较大，这就提出了这种钻具在套管内能否顺利下入的问题。文中根据最小变形能原理对钻具在套管内下入过程中的变形进行分析，解决了变形过程中边界待定问题，并对１２０ 双弯螺杆钻具和９５ 双弯螺杆钻具在１７８套管内的下入作了验证和验算，证实了能量法分析的可行性和有效性，并将原方案的１２０ 双弯螺杆钻具改为９５双弯螺杆钻具，以适应在１７８ 套管内通过。
Because of the much higher slope (1 ° / m or more) than the conventional mid-radius horizontal well, the casing is drilled with short-radius horizontal wells. Therefore, the angle of the structure must be larger, Whether the casing can be successfully entered under the problem. According to the principle of the minimum deformation energy, the deformation of the drilling tool in the process of entering the casing is analyzed to solve the problem of the boundary to be determined in the deformation process. In addition, the deformation of the 120 double bending screw drilling tool and the 95 double bending screw drilling tool at 178 Under the casing to verify and check, confirmed the feasibility and effectiveness of the energy analysis, and the original program 双 120 biconcave screw drill 95 biconcave screw drill to adapt to 在 178 Through the casing.