钻井液用润滑剂与螺杆橡胶的配伍性

对钻井液用润滑剂与螺杆橡胶在高温深井条件下的配伍性开展了实验研究。在不同温度和钻井液处理剂浓度条件下，对比评价油田在用8款橡胶与钻井液处理剂接触后的体积增加率、质量增加率和拉伸强度变化情况。实验结果表明，橡胶样品在添加了润滑剂R-1和R-3的钻井液中变化较大（添加R-1的体积变化率分布在56%～175%，添加R-3的体积变化率分布在49%～148%），随着润滑剂浓度升高，2种类型的橡胶质量变化率和体积变化率随之升高，橡胶溶胀增大。说明润滑剂原料油为螺杆橡胶溶胀的关键影响因素。通过气质联用技术对其进行分析，发现原料油以中质芳香烃为主的润滑剂对橡胶溶胀影响相对较大；并结合润滑剂的应用性能优选出适用于高温深井的钻井液用润滑剂。在台盆区三开和目的层暂停使用中质不饱和烃含量高的润滑剂，螺杆脱胶现象得以明显改善。据统计，该区块每月平均脱胶次数由11井次/月降为0.5井次/月，显著减少了起下钻趟数，提高了生产效率。

Study on Compatibility of Drilling Fluid Lubricants and Screw Rubbers

This paper discusses the experimental studies on the compatibility of drilling fluid lubricants with screw rubbers at high temperature and deep well conditions. At different temperatures and additive concentrations, eight kinds of rubbers were tested for rates of volume increment, rates of mass increment and changes in tensional strength when they were in contact with drilling fluid additives, and the test results were compared and evaluated. The experimental results show that the rubber sample has big changes in drilling fluids treated with the lubricants R-1 and R-3; in the drilling fluid treated with R-1, the rates of volume increment of the rubbers were distributed between 56% and 175%, while in the drilling fluid treated with R-3, the rates of volume increment were distributed between 49% and 148%. When the concentrations of the lubricants were increased, the rates of volume and mass increments of the two rubbers are all increased, and the rubbers swell at higher rates. These results indicate that the raw oil of a lubricant is the key factor affecting the swelling of rubber. Using GC-MS technology, the raw oils were analyzed, and it was found that a lubricant whose raw oil has high content of aromatics has relatively large influence on the swelling of the rubbers. Based on the application properties of the lubricants, some lubricants suitable for use in high temperature deep well drilling were selected. The selected lubricants were used to replace those lubricants with high contents of unsaturated hydrocarbons in the third interval and the reservoir section of the wells drilled in the Taipen block, and rubber disintegration from the screw was significantly reduced. Statistic data showed that times of rubber disintegration was reduced from 11 well times/month in the past to 0.5 well times/month, and this greatly reduced the number of times of tripping and improved the productive efficiency.