旋挖钻机在特殊工况中的减压钻进研究

Rotary drilling with reduced WOB under special working conditions

摘要:

为解决旋挖钻机在脆性岩层或者软硬交替地层等特殊工况中加压钻进出现的钻机高频高幅振动和钻孔极易倾斜等问题，对旋挖钻机入岩的碎岩机理进行分析，找出加压钻进产生问题的原因。对减压钻进施工工艺进行研究，提出实现方式及适用范围，并进行实际工程应用，验证了旋挖钻机使用减压钻进施工的可行性。应用结果表明，特殊工况下减压钻进对降低设备的入岩振动、提高设备的结构稳定性以及保证成孔质量都具有重要作用。

Abstract:

In order to solve the problems of high-frequency and high-amplitude vibration and easy deviation of drilling holes with rotary drilling at increased WOB under special working conditions， such as brittle rock， soft and hard alternate formation， this paper analyzes the rock crushing mechanism of rotary drilling rig to find out the causes of the drilling problems at increased WOB. Study was conducted on the drilling process at increased WOB with the implementation plan and applicable scope put forward. Field application of the process was performed to verify its feasibility， and the results showed that rotary drilling at reduced WOB was of great significance to reduce drilling vibration， improve the structural stability of equipment and ensure the borehole quality.