Self-repairing multi-soap based composite bearing lubricating grease and preparation method thereof

Abstract

The related composite poly-soap self-repair bearing lubricating grease comprises the basic liquid, composite calcium sulfonate, composite Ca-Li-base thickener, non-oxidizing anti-corrosion additive, metal deactivator, tungsten disulfide extreme pressure additive, wear-well additive, self-repair additive, and structural modifier; has well anti-oxidation ability and bearing capacity, can repair wore part on condition of extreme pressure and high temperature to supply the silver-plating lacking on bearing radial surface effectively, prolongs bearing service time on maximum limit, and has special application in oil drilling exploration.

Description

field of invention [0001] The invention relates to a composite multi-soap base self-repairing bearing lubricating grease and a preparation method thereof, in particular to a composite multi-soap base self-repairing bearing lubricating grease used for roller cone bits in the field of petroleum geological exploration and drilling and a preparation method thereof. Background of the invention [0002] The main problems faced by the roller cone bit bearing grease used for petroleum geological exploration and drilling are the early wear and failure of the bearing caused by extreme pressure, heavy load, high temperature, and high impact and vibration. The harsh environment of underground drilling will cause the bearing of the roller cone bit to face extremely high frictional heat generation. The generation of a large amount of frictional heat will easily cause early failure of the grease. Failure to clean the secondary surface in a timely manner will accelerate the rate of wear and...

AI Technical Summary

Problems solved by technology

[0002] The main problem faced by the roller cone bit bearing grease used for petroleum geological exploration and drilling is the early wear and failure of the bearing caused by extreme pressure, heavy load, high temperature, and high impact and vibration.

The harsh environment of underground drilling will cause the bearing of the roller cone bit to face extremely high frictional heat generation. The generation of a large amount of frictional heat will easily cause early failure of the grease. Failure to clean the secondary surface in a timely manner will accelerate the rate of wear and eventually lead to premature failure of the bit bearing, thereby jeopardizing the life of the roller cone bit

[0003] In relevant patents at home and abroad, in Chinese patent document CN200410036957, the thickener adopts calcium sulfonate and polyurea composite, wherein polyurea has the problem of insufficient colloidal stability, and calcium sulfonate soap cannot make up for this defect, so its Oxidation performance and load-carrying performance cannot be guaranteed at the same time, and because the reasonable compatibility of solid additives and wear self-repairing function additives that determine the ultimate extreme pressure and wear resistance of the grease is not considered, the overall performance of the entire grease cannot meet the extreme pressure and high temperature resistance. Grinding self-repair function, there is a problem that a single performance is outstanding but the overall performance is insufficient

Among the relevant patents in the United States are US5589443 and US5668092 involving complex calcium soap base grease or calcium sulfonate soap. Like the relevant domestic patents, either calcium sulfonate soap or calcium complex soap is used, and calcium sulfonate and compound calcium soap are not used. The mixed soap type of calcium, in the selection of additives, does not consider the additives that can repair the wear on the shaft diameter of the bit cone and the surface of the sealing ring. Most of them use molybdenum disulfide solid additives as solid extreme pressure additives, so the friction coefficient of grease is high. Poor wear resistance, no effect on repairing the worn surface