During a well workover, the oily solid contaminant in the well field is composed of crude oil, waste water, surface soil and waste steel sludge spread on the well field.

• 在井下作业中,原油、废水与地表土壤及铺垫井场地面的废钢渣等相混合,形成了特殊的作业井场含油固体废物。