大位移井环保型润滑剂的性能评价

Research and Evaluation of Environmental Friendly Lubricants for Large Displacement Wells

阚艳娜

KAN Yanna

冀东油田地处环境敏感区域， 为降低环保风险， 同时满足大位移井钻井需要， 通过考察聚醚多元醇 SYP-2与聚合醇 JLX的生物毒性、 生物降解性及其与常规聚合物钻井液体系的配伍性及润滑性能， 研制了以聚醚多元醇 SYP-2与聚合醇 JLX复配的大位移井环保型润滑剂（2% SYP-2+2% JLX）， 并与常用润滑剂的性能进行了对比。结果表明， SYP-2、 JLX两种处理剂的半最大效应浓度 EC50> 500， 000 mg/L， 均为无毒； SYP-2、 JLX的 BOD5/CODCr分别为 15.59%和 29.2%， 均为可降解材料。该环保型润滑剂（2% SYP-2+2% JLX）与冀东油田常用的聚合物钻井液体系配伍性良好， 流变性能稳定， 润滑系数降低率>70%， 泥岩回收率为 75%， 在满足润滑条件的同时提高了钻井液的抑制性能， 综合性能优于目前在用的润滑剂， 可用于冀东油田大位移井钻井施工。表4参 14

Jidong Oilfield is located in an environmentally sensitive area，in order to reduce environmental risks and meet the needs of large displacement well drilling，through investigating the biological toxicity of the polyether polyol SYP-2 and polyol JLX，biodegradability of SYP-2 and JLX，the conventional system compatibility of the SYP-2 and JLX with the Jidong oilfield polymer drilling fluid and lubrication performance of the SYP-2 and JLX，a kind of environmental protection lubricant for large displacement well，composed of 0.2% SYP-2 and 0.2% JLX，was obtained，and lubrication performance of the obtained lubricant was compared with that of the lubricant in use currently. The results showed that the two kinds of treatment agent are nonpoisonous，because the concentration for 50% of maximal effect（EC50）of SYP-2 and JLX was higher than 500， 000 mg/L. The BOD5/CODCr value of SYP-2 and JLX was 15.59% and 29.2%，respectively，indicating that the SYP-2 and JLX were biodegradable materials.The environmental-friendly lubricant had good compatibility with the polymer drilling fluid system，the rheological properties of the polymer drilling fluid，after adding 0.2% SYP-2 and 0.2% JLX，was stable，the reduction rate of the lubricating coefficient was higher than 70%，and the shale recovery rate was 75%，which indicated that the addition of 0.2% SYP-2 and 0.2% JLX could not only meet the lubrication condition but also improve the inhibition performance of drilling fluid. The compressively performance of the obtained environmental-friendly lubricant was superior to that of the lubricant in use，hence，the lubricant could be used for drilling large displacement wells of Jidong oilfield.

10.19346./j.cnki.1000-4092.2017.04.003