摘要
以沙颍河水平定向钻2号管穿越工程为例,应用理论分析及数据分析的方法对施工过程中导向孔钻进6次、扩孔扭矩大且耗时长、回拖管道时发生扩孔器断裂事故等问题进行了研究,总结了大直径水平定向钻穿越施工的经验与教训,为今后水平定向钻进技术在南水北调等资源和能源管道项目中的应用提供重要借鉴。研究结果显示:地磁有线控向系统+无线控向系统的双控向系统可有效降低导向孔失败风险;泥浆配制及净化设备不完善是引起沙颍河穿越工程施工不顺利的重要原因;根据地质条件选择合适的钻具可有效提高施工效率;回拖扩孔器断裂的原因是疲劳断裂,采用人工顶管法处理事故有借鉴意义;松散地层中连续施工可降低孔壁失稳风险。
This study takes the Shayinghe River HDD crossing engineering of NO. 2 pipeline as an example, and uses theoretical analysis and data analysis to interprete the issues that have occurred in the construction process such as 6 times of pilot hole drilling, large and time-consuming reaming torque, reamer fraeture ac- cident in the process of pullback. This paper has summarized experiences and lessons obtained in a large di- ameter horizontal directional drilling construction, which will provide important reference for future HDD applications in the North Water Transfer and other resources and energy pipeline projects. The study re- suits show that the dual direction control system of geomagnetic wire system plus wireless system can ef- fectively reduce the risk of failure of the pilot hole and that the imperfect mud preparation and purification equipment can be the main cause for the poor performance of Shayinghe River crossing construction. The results also indicate that the selection of the appropriate drilling tools according to geological conditions can effectively improve the efficiency of construction and the pullback reamer fracture is caused by fatigue frac- ture and that continuous constructions can reduce the risk of destabilizing of borehole wall in loose forma- tions. For this kind of constructions, the treatment of artificial pipe jacking method can be a reference.
出处
《地质科技情报》
CAS
CSCD
北大核心
2016年第4期208-212,222,共6页
Geological Science and Technology Information
关键词
水平定向钻
大口径
导向孔
扩孔
扭矩
管道回拖
扩孔器断裂
horizontal directional drilling
large diameter
pilot hole
reaming
torque
pipeline pullback
reamer fracture
