Dynamic pressure circulating lubrication roller bit

Abstract

The invention provides a dynamic pressure circulating lubrication roller bit to overcome defects of the traditional lubrication system roller bit. The technical scheme is that: the end part of a palm is provided with a palm small shaft; the back of the palm is provided with a sealing oil storage hole; the top end of the palm small shaft is provided with a small shaft oil pump; and the palm is provided with an oil inlet channel and an oil outlet channel which are connected with a bearing chamber and the sealing oil storage hole. A lubrication dead zone at a sealing ring is eliminated, so that the end part of a plug is more easily seamlessly fitted with a runway of a locking steel ball, and the safety factor of the bit is improved; the traditional pressureless lubrication is changed into pressure lubrication, the dynamic pressure of fluid can timely repair a broken lubricating grease oil film, a pressure-bearing surface of a journal of the bit is supplemented with bit grease instantly, and a bearing cannot be quickly worn due to lubrication failure; and the service life of the bit is greatly prolonged, the rotating speed of the bit can be not under control, and the bit can better meet the requirement of high-pressure high-speed drilling in modern times and even in the future.

Description

technical field [0001] The invention relates to a roller cone bit, in particular to a dynamic pressure circulation lubrication roller cone bit, which realizes the dynamic pressure circulation of lubricating grease and belongs to the field of drilling tools. Background technique [0002] Roller cone bits are widely used in petroleum, natural gas, geology, coal fields, hydrological exploration and mining. Modern advanced drilling technology and equipment, pursuing safe and fast well completion process, the roller cone bit has the advantage of strong adaptability to the formation, and its position in the drilling and production tool cannot be replaced. The main reason for the failure and scrapping of roller cone bits is generally due to the chain reaction of poor lubrication. Poor lubrication is directly reflected in the premature fatigue of the bearing sliding pair or rolling pair, and the bearing cannot withstand high drilling pressure and high speed, resulting in a signific...

AI Technical Summary

Problems solved by technology

Poor lubrication is directly reflected in the premature fatigue of the bearing sliding pair or rolling pair, and the bearing cannot withstand high drilling pressure and high speed, resulting in a significant reduction in drilling speed

The second is that the roller cone bit is poorly lubricated, the temperature in the bearing cavity accumulates, and it cannot be released when the pressure rises, which has a fatal impact on the maintenance of the sealing performance

[0003] In the lubrication system of roller cone bits currently used, the bit grease can only circulate partially in the bearing cavity, and a very small amount of drill bit grease in the bearing cavity is reused, and the lubrication effect is not ideal

Some existing roller cone bits try to use the drill bit grease in the external oil storage hole, but because there is no reasonable circuit for drill bit grease circulation, or the lack of circulation power, the drill bit grease can only fluctuate back and forth within a certain range, and cannot form a complete cycle

Therefore, the roller cone bit of the traditional lubrication system cannot make all the bit grease participate in the lubrication of the bearing pair, and cannot meet the drilling requirements of high drilling pressure and high speed

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