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HDD Machine common cases and solutions 06

Problems and solutions during construction of ultra-long-distance horizontal directional drilling through pipelines 1

(1) Oriented construction: When faced with ultra-long-distance horizontal directional drilling, the internationally advanced directional hole dual-drilling rig synchronization construction technology is adopted; the dual-drilling rigs are synchronized and coordinated at both ends of the excavation point and the soil entry point to solve the long-distance crossing In the pilot hole construction, the drill pipe is unstable and the strength is insufficient.

(2) Reaming construction: Each entry point is equipped with a drilling rig, one provides torque and the other provides tension, which avoids the problem of out of control of the reamer caused by the excessively long drill rod, reduces the risk of reaming construction, and improves Reaming speed.

Hole washing: After each reaming construction, the hole should be washed with a twisting cage. If satisfactory results cannot be obtained from one washing of the holes, the holes should be washed 2 to 3 times to thoroughly clean the gravel and the holes in the holes. Impurities.

(3) Drag-back construction: The “two-by-one” construction method is adopted to reduce the friction during the drag-back process, and solve the construction problems of excessive drilling rig thrust and easy damage to the pipeline in the long-distance pipeline drag-back.

 

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