Technological process for comprehensive treatment for waste drilling fluid following drill for oil-gas field

The present invention relates to a technical method for treating oil-gas field waste drilling fluid comprehensively during drilling, being the treatment technology of the oil-gas field waste drilling fluid. According to the principles of treating during drilling, separating solid from fluid, treating comprehensively by sorts, realizing maximum comprehensive utilization and realizing energy conservation and emission reduction, the whole comprehensive treatment technology of the waste drilling fluid is divided into four steps of fluid-chip separation, solid-fluid separation, sewage disposal and purified water storage. The waste drilling fluid is treated by procedures of primary purification cleaning, cyclone desanding, cyclone deoiling, secondary purification cleaning, tertiary purification cleaning, solid-fluid separation by slurry destabilization, destabilizing filtrate by adding drug, air floatation, micro electrolyzing, filtering by compulsion, oxygenating and fine absorbing and filtering to wash and separate fluid and chips and then purify rock chips for using, wherein, partial slurry is recycled for proportioning slurry. The residual slurry is caked for using after solid-fluid separation and dehydration. The main contamination index of the sewage disposal reaches the standards. The present invention is convenient for reusing the field, reusing fluid-chip separation and cleaning water or achieving the goal of standard discharge of comprehensive treatment during drilling.