A drilling tool for horizontal directional drilling and reaming

Abstract

The invention provides a drilling tool for horizontal directional drilling and reaming, comprising: a pilot drill bit, one side of which is connected with a hollow drill rod; a reaming drilling tool, which is sleeved on the drilling rod, and the reaming drilling tool includes: a transmission shaft, The drive shaft is detachably connected to the drill pipe; a tapered cam is set on it; the cuttings guide is rotatably set on one end of the drive shaft, and the end of the cuttings guide is provided with a number of roller cone bits. The inner side of the chip guide is provided with a conical grinding disc; the driving part is arranged at one end of the transmission shaft, which is used to drive the transmission shaft and the cuttings guide to rotate in reverse synchronously; a mud is arranged between the conical cam and the conical grinding disc. Channel, with the rotation of the conical cam, the inner diameter of the mud channel gradually increases or decreases. Through the combination of the conical grinding disc and the conical cam, the grinding part of the mud block is formed. Through the reverse rotation of the conical cam and the conical grinding disc, the reaming soil and cleaning liquid can be ground and mixed into mud, which is helpful for the reaming process. Transportation of mud.

Description

technical field [0001] The invention belongs to the technical field of horizontal directional drilling, and in particular relates to a drilling tool for horizontal directional drilling and reaming. Background technique [0002] Horizontal directional drilling technology is a non-excavation construction technology, which can detect, inspect, replace and lay various underground utilities such as pipelines and cables without excavating the surface. Especially for large-diameter pipeline laying and pipeline repair, it plays a very important role. [0003] During the construction of horizontal directional drilling, it is necessary to install a sensing element at the front end of the drill pipe. By tracking the sensing element on the ground, it is helpful to accurately control the direction and depth of the directional drill bit. After the first drilling is successful, it is necessary to carry out hierarchical reaming on the basis of the first pilot hole, and configure different ...

AI Technical Summary

Problems solved by technology

[0004] However, during the reaming process, the excavated underground soil is difficult to mix with the cleaning fluid transported by the drill pipe to form mud, resulting in difficulty in mud transportation and limiting the progress of reaming; moreover, during reaming operations, drill stuck many times Phenomenon, lead to reaming drilling tool overload, resulting in serious wear, and with the increase of mud pressure inside the tunnel, it will further aggravate the wear of the drilling tool, reduce the service life of the drilling tool, and even tunnel accidents will occur

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