摘要
聚磺钻井液体系的钻井废液无害化处理达标难度较大,尤其是过高的COD值和pH值难以控制。采用实验室复配的钾钙基聚磺体系钻井液为试样,处理前COD值高达22 466.4mg/L,pH值为11.45,加入MTH-1、MTH-2、MTH-3、粉煤灰和水泥进行固化处理,并对固化剂配比进行优化实验。结果表明,在2.5%(w)MTH-1+2.5%(w)MTH-2+8%(w)粉煤灰+35%(w)水泥最优化投加量基础上,候凝期用MTH-3调节pH值,固化后浸出液COD值、pH值等各项指标均达标。该配方在3个井场的废弃钻井液的处理中,均能达到良好效果,固化物浸出液各项污染指标达到GB 8978-1996《污水综合排放标准》中一级标准要求。
At present,it is hard to conduct the harmless treatment on the wasted polysulfide drilling fluid to reach the national standard,especially the noticeably high COD and pH value.In this study,the potassium calcium based polymer mud prepared in lab,with COD as high as 22 466.4 mg/L and pH value at 11.45 originally,was taken as the sample.The drilling fluid was solidified by adding MTH-1,MTH-2,MTH-3,fly ash and cement;and tests were conducted to determine the optimal proportions.The results showed that the optimal recipe was 2.5 wt% MTH-1,2.5 wt%MTH-2,8 wt%fly ash and 35 wt%cement while MTH-3 was used to adjust the pH value during the curing period.With the above treatment,COD and pH value of the leachate could meet the'Integrated Wastewater Discharge Standard(GB 8978-1996)'.Field test on wasted drilling mud from three wellsites further confirmed the above conclusion.
出处
《石油与天然气化工》
CAS
北大核心
2017年第5期106-112,共7页
Chemical engineering of oil & gas
基金
四川省科技计划项目"钻井固废不落地处理工艺及综合利用技术研究"(2017FZ0075)
西南石油大学油气田污染治理青年科研创新团队"油气田污染治理"(2013XJZT003)
关键词
聚磺钻井液
无害化
固化技术
配方优化
polysulfide drilling fluid
harmless
solidification technology
recipe optimization
