Method for innocently treating drilling mud by using mixed microbial agents

Abstract

The invention discloses a method for innocently treating drilling mud by using mixed microbial agents. The method comprises the following steps of adding properly stirred microbial agents in mud discharged in a petroleum and gas drilling process; performing treatment layer by layer; inoculating anaerobic bacteria at a position below a 1m position in a pond for storing the mud; and inoculating aerobic bacteria in the mud above the 1m position and on the surface layer of the pond. By layered treatment, the degradation speed of harmful substances is increased greatly, and the degradation effect of pollutants is improved. After the mud is stored for 3-12 months in the place, various indexes of the mud reach a dry land level-3 standard of farmland soil environment quality standards of China. Woods or crops can be planted in a treated wasted mud pile, a broken ecological system can be recovered, and the purposes of energy conservation, emission reduction, safety and high efficiency are achieved. The method is convenient to operate, physical volume of the mud is not increased in a treatment process, the cost of the method is lower than that of another method by 20%-30%, the mud can be treated in batches, and the method is suitable to be popularized and used in domestic and foreign oil and gas fields widely.

Description

technical field [0001] The invention relates to a microbial treatment method for drilling waste mud, which belongs to the field of environmental protection; in particular, it relates to a method for harmlessly treating drilling mud with a mixed microbial agent. Background technique [0002] The total annual discharge of waste drilling mud in my country is about 2 to 3 million square meters, most of which are piled up and landfilled without treatment, causing serious pollution hazards to surrounding vegetation, soil, surface water and groundwater, and permanently occupying A large number of valuable land resources. [0003] The characteristics of waste drilling mud: complex composition, alkaline, pH=8~13; large chroma, viscous fluid or semi-fluid appearance; particles smaller than 2500 mesh, diameter 2~10μm; moisture content 30%~ 90%, not easy to dehydrate; high viscosity; contains a variety of organic and inorganic chemical treatment agents, high concentration of harmful sub...

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Problems solved by technology

Patent 201010148295.9 "Biological treatment method of waste mud in oil and gas exploration and drilling operations", CN200710195552 "Microbial harmless treatment method of waste mud from drilling in oil and gas fields", 201210380612.9 "Bioremediation method of waste drilling mud in oil and gas fields and shale gas fields", 201310426947.4 " Oil and Gas Field Drilling Waste Mud Treatment Process", 201110005911.X "A Biological Treatment Method for Oilfield Drilling Waste", 201410623410.1 "A Salt-alkali-tolerant Microflora and Its Application", etc. need to add 1 to 3 times Dilute new soil or 4-5 times the volume of water, which will greatly increase the volume of the mud pool and the number of constructions, which will increase the amount of mud treatment and increase the treatment cost