Well-drilling redressing and reaming device

Abstract

The invention relates to a well-drilling redressing and reaming device. The well-drilling redressing and reaming device comprises a pilot hole redressing device located at the lowermost end of a drillstring, an explosive reaming device is connected to the upper portion of the pilot hole redressing device, and a variable-diameter hole grinding device is connected to the upper portion of the explosive reaming device; the pilot hole redressing device comprises a redressing drill string, and the redressing drill string comprises a redressing device female connector, a redressing upper cone, a redressing cylinder and a redressing lower cone which are sequentially connected into a whole from top to bottom and are coaxial; the lower end of a female thread of the redressing device female connector is provided with a redressing device liquid flowing channel extending downwards; a plurality of redressing spiral bands are evenly distributed on the outer circumferences of the redressing upper cone, the redressing cylinder and the redressing lower cone; and redressing scrapers are embedded in all the redressing spiral bands; the bottom of the redressing lower cone is connected with a pilot hole spherical head, a plurality of redressing device water holes are formed in the bottom of the pilot hole spherical head, and all the redressing device water holes communicate with the redressing device liquid flowing channel through redressing water-hole hole channels correspondingly. The well-drilling redressing and reaming device is high in reaming speed and low in downhole risk, repeated tripping operation is avoided, and the well-drilling efficiency is greatly improved.

Description

technical field [0001] The invention relates to a reaming and reaming device for drilling, which belongs to the technical field of petroleum drilling equipment. Background technique [0002] When the drill string is going down the well, reaming must be carried out first. Traditional reaming tools generally use milling toothed roller cone bits. When the milling toothed roller cone bit is blocked from descending, it is necessary to pull out the drill and lower the pilot tool. The general collar tools mainly include the collar male cone and the collar scraper. The structure of the collar male cone is to weld the blade on the cone on the basis of the male cone, which consists of a female buckle joint, a blade, a guide rod and a horseshoe-shaped end It consists of four parts; the structure of the eye scraper is to weld the blade on the stepped cylindrical body, which is composed of a female buckle joint, a blade, a body, and a guide column. After the drilling is completed, the m...

AI Technical Summary

Problems solved by technology

[0005] Due to the influence of the compaction strength of the reaming formation, rock hardness and wellbore inclination, conventional hydraulic reamers have problems such as broken blades of the reamer, long reaming time, large reaming torque, and heavy drilling tools. High risk, poor reaming effect, etc.

Reaming while drilling with a double-center drill has problems such as long reaming time, large reaming torque, and short life of the drill bit.

Especially in the leakage and easy-to-collapse formations, the reaming operation is difficult and risky, and the reaming accuracy cannot be guaranteed sometimes, which largely limits the next step of drilling operations

Images