A method of horizontal directional drilling through percussion rotary drilling

Abstract

The invention discloses a horizontal directional drilling crossing impact rotary drilling method, which belongs to the technical field of oil gas pipeline horizontal directional drilling crossing and oil gas drilling and production. A horizontal directional drilling crossing impact rotary drilling method can realize the exploration and analysis of crossing terrain Finally, determine the loose stratum area, equip the existing drill pipe with a corresponding number of telescopic shaping rods, and launch the telescopic shaping rods vertically upwards after drilling to the loose stratum area, so that the telescopic shaping rods can penetrate into the upper layer The shape-setting action is triggered in the terrain, and multiple shape-setting tentacles are extended from the telescopic shaping rod to the surrounding area to improve the grip on the formation, so as to realize the effective connection of the upper and lower areas of the loose formation and improve the stability of the drilling hole wall It can significantly reduce the risk of hole collapse, and increase the strength of the formation near the pipeline when reaming and pulling back the pipeline, reduce the risk of pipeline settlement, and greatly improve the safety and stability of construction.

Description

technical field [0001] The invention relates to the technical field of horizontal directional drilling for crossing oil and gas pipelines and oil and gas drilling and production, and more specifically relates to a horizontal directional drilling crossing percussion 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 fas...

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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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