大位移井高温水基钻开液用抗高温润滑剂的研制与应用

Development and Application of High Performance Lubricants High Temperature Resistant for High Temperature Water Based Drilling-in Fluids in ERD Wells

针对大位移井高温储层水基钻开液高负荷、高盐度、高温条件下液体润滑剂润滑性能不足问题,基于润滑剂作用机理分析,通过油性剂组分和极压抗磨组分的筛选,开发了适用于大位移井高温钻开液的高温润滑剂。采用极压润滑仪评价了润滑剂在高温钻开液中润滑性能,结果表明加入1%LUBE HT高温钻开液热滚前和热滚后的摩擦系数分别降低了95%和82%;采用润滑模拟评价装置(LEM)评价了润滑剂在高温钻开液中150℃高温下的润滑性能,结果表明加入1%LUBE HT高温钻开液摩擦系数降低了67%。渤海油田渤中区块某井五开6"井段高温钻开液中加入15kg/m3 LUBE HT,钻进扭矩由加入前23~25kN·m降至19~21kN·m,空转扭矩由加入前17~19kN·m降至12~14kN·m,保障了后续作业顺利高效完成,这说明LUBE HT具有优良的降摩减阻性能。

Generally,the lubricity of Water Based Drilling-in Fluids originated from liquid lubricants is not enough under high load,high salinity,and high temperature conditions in extended reach wells.A unique high-temperature lubricant compatible for high-temperature drilling fluids in extended reach wells was developed through the screening of oil-based agent components and verified by extreme pressure anti-wear instrument.The lubrication performance of lubricants in high-temperature Drilling-in fluids was verified by EP lubrication instrument.The results showed that the mixing of 1%LUBE HT in high-temperature Drilling-in fluid reduced the friction coefficients before and after hot rolling by 95%and 82%,respectively.The performance of lubricants in high-temperature Drilling-in fluid at 150℃was proved using a lubrication simulation evaluation device(LEM),and the results showed that the mixing of 1%LUBE HT in high-temperature Drilling-in fluid reduced the friction coefficient by 67%.15 kg/m3 LUBE HT was mixed to the high-temperature Drilling-in fluid in the 6"section of block Bozhong in Bohai Bay,China,The drilling torque decreased from 23~25 kN·m before addition to 19~21 kN·m,the idle torque decreased from 17~19 kN·m before addition to 12~14 kN·m,ensuring the smooth and efficient completion of subsequent operations,this indicates that LUBE HT has excellent friction and drag reduction performance.