The longer the single drill pipe, the lesser the critical compressive force of drill stem.
钻杆的单根长度越长，钻柱所能承受的临界载荷越小。
The research indicated that the critical compressive force of drill stem in horizontal well is closely related with the length of single drill pipe in use.
研究表明，水平井眼中钻柱所能承受的临界载荷和所使用钻杆的单根长度有密切关系。
Analystical or simple accurate approximate formula of critical load of plunger under its weight and compressive force on the end or hydraulic pressure and compressive force on the end are provided.
给出重力与压载、液压与压载下临界压载的解析公式或简便精确的近似公式。
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