Novel horizontal directional drilling crossing percussive rotary drilling method

Abstract

The invention discloses a novel horizontal directional drilling crossing percussive rotary drilling method, and belongs to the technical field of oil and gas pipeline horizontal directional drilling crossing and oil gas drilling and production. According to the novel horizontal directional drilling crossing percussive rotary drilling method, a loose stratum area can be determined after explorationand analysis of a crossing terrain, an existing drill rod is equipped with a corresponding number of retractable setting rods, after drilling to the loose stratum area, the retractable setting rods go deep into an upper terrain and trigger and unfold setting action by launching the retractable setting rods vertically upward, a plurality of setting triggering hands extend from the retractable setting rods to the surrounding area, the gripping force of the terrain is improved, effective connection of upper and lower areas of the loose stratum is realized, the stability of drill hole walls is improved, the risk of hole collapse is obviously reduced, the terrain strength near a pipeline is improved when the pipeline is reamed and dragged back, the risk of pipeline settlement is reduced, and the safety and stability of construction are greatly improved.

Description

technical field [0001] The invention relates to the technical field of horizontal directional drilling crossing of oil and gas pipelines and oil and gas drilling and production, and more specifically relates to a novel horizontal directional drilling crossing impact rotary drilling method. Background technique [0002] Horizontal directional drilling rig is a construction machine for laying various underground utilities (pipes, cables, etc.) without excavating the ground surface. In paving construction, it is suitable for sandy soil, clay, and other ground conditions, and it can be constructed in most non-hard rock areas in my country if the groundwater level is high and the pebble stratum is not suitable. The working environment temperature is -15℃~+45℃. Horizontal directional drilling technology is a new construction technology that combines directional drilling technology in the petroleum industry with traditional pipeline construction methods. It has the advantages of fa...

AI Technical Summary

Problems solved by technology

[0004] However, in the stages of drilling, reaming and dragging back, the wall of the borehole is only supported by liquid mud, and it is difficult to keep the wall of the borehole stable for a long time in the loose stratum, and the step-by-step reaming will increase the disturbance to the stratum and prolong the The self-stabilization time of drilling increases the risk of crossing failure caused by hole collapse. At the same time, in the process of crossing, only mud is used in the prior art to carry the dual functions of cuttings and stabilizing the hole wall. It is necessary to increase the viscosity of the mud and reduce the fluidity of the mud. On the other hand, it is necessary to reduce the viscosity of the mud so that the mud can flow under a lower pressure. In order to solve this contradiction, the only way to improve the performance of the mud is to increase the amount of bentonite and additives. , so as to increase the construction cost, and the effect of mud stabilizing the hole wall is relatively limited, and its effect is weak in loose formations, resulting in increased construction difficulty

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