Top drive gearbox is the key transmission component of top drive drilling system(TDS),which has high requirements on the foam characteristics and temperature control ability of gear oil,and for this reason,top drive gear oil was developed.Through the selection of base oil and compounding agent,as well as the examination of the foam characteristics of the oxidized gear oil,the synthetic top drive gear oil was obtained,consisting of synthetic base oil(PAO4+mPAO+POE),2.5％ of RHY4206 industrial gear oil additive package,and 120 μg/g of composite antifoam agent(20 μg/g of methyl silicone oil+100 µg/g of modified silicone polymer).The foam characteristics(24 ℃,93 ℃,then 24 ℃)were 0 mL/0 mL,0 mL/0 mL,0 mL/0 mL(No.68)and 5 mL/0 mL,10 mL/0 mL,5 mL/0 mL(No.150).The application shows that the operating temperature of the synthetic top drive gear oil is stable between 34.8 ℃ and 49.6 ℃,which is lower than the alarm value of 60 ℃.The developed synthetic top drive gear oil has good foam characteristics and temperature control ability,and can fully meet the lubrication requirements of the top drive gearbox.(Chart 1 Tables5 References2)
polyalphaolefinpolyol esterfoam characteristicstemperature control ability
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