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The existing drilling efficiency-monitoring model based on the theory of mechanical specific energy is only applicable to vertical wells. When it is used to monitor the drilling efficiency of horizontal wells, the impact of high friction in horizontal wells is not considered, so the monitored specific energy of the machine is not real Specific energy of horizontal wells. Based on the previous research results, this dissertation uses the micro-element method to segment the drill string into micro-elements, and considers the influence of the friction torque of the horizontal well. For the existing horizontal wells, rotary drilling, sliding drilling and the characteristics of compound drilling have derived the mechanical specific energy calculation models of horizontal wells based on these three different drilling conditions for real-time monitoring of drilling efficiency of horizontal wells.

Accurate Calculation Method for Mechanical Specific Energy of Horizontal Well