废弃钻井液微生物-固化复合处理技术研究

摘要

对苏里格气田区块废弃钻井液进行微生物-固化处理,以浸出液重金属离子含量、COD Cr和无侧限抗压强度为考察指标,通过固化剂正交实验配方优选、微生物菌种筛选,对苏里格区块的废弃钻井液微生物-固化复合处理技术进行优选.结果表明,固化剂的最佳配方为:每100 mL废弃泥浆添加8 g LQ固化支撑剂+2 g SH-1综合调节剂+2.4 g MJ-1促凝剂+5 g水泥.以SL-1型细菌为微生物处理剂,加入量为6 mL.微生物-固化处理后的废弃泥浆钻井液7 d无侧限抗压强度高达3.41 MPa,含水率为36.9％ ～40.7％,浸出液的pH为6.9～8.7,重金属离子含量、COD Cr、石油类和色度均符合GB 8978—2002污水综合排放I级标准,可直接覆土掩埋,达到无害化处理的结果.%The waste drilling fluid from Sulige Gas Field was microbial-solidified. The heavy metal content of the leaching solution and the chemical oxygen demand (COD Cr )value and unconfined compressive strength were viewed as assessment indicators. By optimizing the compound of solidification agents and mi-crobial strains,waste drilling mud was disposed of using the technology of microbial-solidification treatment. The results showed that 8 g LQ curing proppant,2 g SH-1 integrated regulator,2. 4 g MJ-1 accelerator,5 g cement,and 6 mL SL-1 bacteria. After 7 d,the compressive strength of the cured product of seven days up 3. 41 MPa,the moisture content of the drilling fluid was between 36. 9％ and 40. 7％,the pH value was within the scope of 6. 9 ～8. 7. According to GB 8978—2002,the heavy metal content of the leaching solu-tion,the chemical oxygen demand (COD Cr ),petroleum and chromaticity all could reach the first grade dis-charge standard. And the results show that solidification product meets the criteria of harmless treatment.