Reverse circulation channel-type double stage reamer

Abstract

The invention provides a reverse circulation channel-type double stage reamer comprising a reverse circulation assembly. The reverse circulation channel-type double stage reamer is characterized in that the reverse circulation assembly comprises a mandrel whose inner portion is provided with a reverse circulation structure; both ends of the mandrel are internal thread joints; a front centralizer,a first level reaming base, a second level reaming base, a rear centralizer and a slag suction bucket are welded on the shell of the mandrel; a front spiral blade is welded on the shell of the front centralizer while a rear spiral blade is welded on the shell of the rear centralizer; the slag suction bucket is welded on the shell of the mandrel and located between the first level reaming base andthe second reaming base; the slag suction bucket is communicated with the mandrel through a slag suction pipe; a reinforcing rib is respectively welded on the shell of the mandrel and the end surfaceof the rear centralizer; tooth palms and double rows of PDC (polycrystalline diamond compact) blades are respectively fixed on the first level reaming base and the second level reaming base; the end portion of the tooth palms is connected with a cone. The reverse circulation channel-type double stage reamer has the advantages of being applicable to different geology, having large cross section insingle reaming and high reaming efficiency, and achieving the effects of quick replacement of cutting edges, reducing costs and prolonging service life.

Description

technical field [0001] The invention belongs to the technical field of horizontal directional drilling, and in particular relates to a hole reaming tool suitable for crossing projects of horizontal directional drilling. Background technique [0002] Large-diameter and long-distance crossing are the key points and difficulties in the current horizontal directional drilling construction process. Roller cone reamers are commonly used for long-distance complex formation crossing. At present, there is no unified industry standard for the processing and manufacturing of commonly used cone reamers, with poor quality, fast wear, high consumption, generally low service life, and many in-hole accidents such as broken teeth, broken cones, and tooth loss. [0003] In the process of horizontal directional crossing, the conventional roller reamer has many disadvantages, such as: small single crushing area, low efficiency of slag discharge by positive circulation, welding roller, non-repl...

AI Technical Summary

Problems solved by technology

At present, there is no uniform industry standard for the processing and manufacturing of commonly used roller reamers, poor quality, fast wear, high consumption, generally low service life, and many in-hole accidents such as broken teeth, broken teeth, and tooth loss.

[0003] In the process of horizontal directional crossing, the conventional roller reamer has many disadvantages, such as: small single crushing area, low efficiency of slag discharge by positive circulation, welding roller, non-replaceable teeth, high cost, etc., at the same time For long-distance reaming, conventional reamers still face the problems of poor guiding ability, large swing of drill pipe and drilling tools, and large inclination angle under the action of gravity of drill tool assembly

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