Drill with flexible nozzle

Abstract

The invention relates to a drill bit with a flexible nozzle that is used in drilling engineering. The drill bit can be washed and cooled better; the drill bit can clean well-bottom rock debris and assist rock breaking better. The technical solution comprises that the flexible nozzle is connected with the drill bit at the nozzle hole of the bit; the flexible nozzle is provided with a drilling liquid spraying hole which communicates the internal flow channel of the drill bit with the external space of the drill bit; the flexible nozzle consists of a joint connected with the drill bit and a flexible spray pipe; the flexible spray pipe comprises one of a metal tube, a rubber tube and a plastic tube; or the flexible spray pipe is formed by compounding two or three tubes above. The flexible nozzle employs a tube with continuous tube wall or a tube with incontinuous tube wall. The flexible nozzle of the invention can obviously shorten the distance between the drill bit nozzle outlet and the well bottom, thereby reducing energy loss of drilling liquid jet current; the flexible nozzle of the invention can enlarge working area of the jet current at the well bottom and cause pulsation effectat the well bottom; the nozzle outlet direction can be adjusted to realize functions such as positioned ejection and insequent ejection; and the flexible nozzle has excellent anti-breaking capabilityand high reliability.

Description

technical field [0001] The invention relates to a drill bit equipped with a flexible nozzle used in drilling engineering in the fields of oil and gas, mining engineering, foundation engineering construction, geology, water lines and the like. Background technique [0002] The drill bit is a rock-breaking tool used in drilling engineering to break rock and form a wellbore. The drill bit is usually equipped with nozzles before entering the well. The nozzle is an auxiliary component installed on the drill bit. It is connected with the drill bit at the nozzle hole of the drill bit. The nozzle is provided with a drilling fluid injection hole that connects the inner flow channel of the drill bit with the outer space of the drill bit. The purpose of installing nozzles on the drill bit is to increase the jet velocity of the drilling fluid so that it can better clean and cool the drill bit, remove the bottom hole cuttings, and use the energy of the drilling fluid jet to assist in b...

AI Technical Summary

Problems solved by technology

[0004] Although these three methods are effective, they also have the following limitations: First, the fracture resistance of high-hardness nozzles decreases with the increase of their length. , it is prone to fracture when it is hit by collision. Once the fracture occurs, the consequence is not only the failure of the nozzle, but more seriously, the nozzle that falls into the bottom of the well will damage the drill bit, which will have a very adverse effect on the drilling process.

Secondly, when the length of the nozzle exceeds a certain range, it may increase the difficulty of drill manufacturing and nozzle installation

Third, the position of the nozzle on the drill bit and the jet flow direction have been determined during the design. Once the nozzle is installed on the drill bit, its position and jet flow direction are fixed and cannot be adjusted, which is determined by the rigidity of the nozzle structure

Due to the existence of these three limitations, the full play of the nozzle efficiency is limited.

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