A hole reamer with self-righting guiding function

Abstract

The invention provides a hole reamer with a self-righting and guiding function. The reamer includes a main shaft, a plurality of cones, a plurality of stabilizing ribs, one or more reinforcing ribs of the cones, and sequentially set and fixed on the main shaft. A base and a centering barrel, wherein the main shaft includes a first medium flow path, a second medium flow path and a shaft body, and the base has an inner cavity, a plurality of cone seats, and the same number as the plurality of cone seats Equal third medium flow path. The multiple cones are fixedly arranged on the multiple cone seats, and the one or more cone reinforcement ribs are arranged on the right side of the base and can connect the base or each cone to the shaft body of the main shaft. connection; the left side of the base and part of the shaft body of the main shaft are sealingly and fixedly connected to the left side of the centralizing bucket to form a gas chamber that can be used to inflate to generate buoyancy; the multiple centralizing ribs are respectively arranged on the outer barrel of the centralizing bucket on the wall. The reamer of the present invention has the advantages of simple structure, self-righting and guiding function, and reduced risk of drill pipe breakage.

Description

technical field [0001] The invention relates to the directional drilling and crossing construction of large long-distance pipelines in the surface construction of oil and gas pipelines in oil and gas fields, and belongs to the technical field of drilling or drilling engineering. Specifically, it relates to a hole reamer with a self-righting guiding function. Background technique [0002] At present, because the horizontal directional drilling mainly traverses the strata within 30m from the ground, the stratum fragmentation is complicated, especially the soil entry and excavation sections close to the ground are mostly weathered or fully weathered strata, which brings great difficulties to the reamer and reaming process. difficulty. However, the existing horizontal directional drilling construction requirements continue to increase, and there are more and more directional drilling projects with a diameter of 1000mm and above, and the requirements for reamers are also increas...

AI Technical Summary

Problems solved by technology

[0003] When common large-scale directional drilling is used for reaming, the existing large-diameter reamers have a tendency to fall when reaming due to their heavy weight, especially when multi-stage reaming has a greater impact on the shape of the channel. Most of them are pear-shaped holes with small top and big bottom. The quality of hole formation is not conducive to the back-tow of the pipeline, which seriously affects the success rate of back-tow and the anti-corrosion layer of the pipeline. Especially for soft geology such as sand and mudstone, the tendency to form pear-shaped holes is more obvious

At the same time, this kind of reamer does not have the function of self-righting and guiding, and an external centralizer is needed to guide the reamer along the axis of the tunnel.

However, the addition of centralizers will increase the weight of the connecting structure and the drill pipe in the hole, increasing the risk of drill pipe breakage

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