Biological treatment method for waste mud in petroleum and natural gas exploration drilling work

Abstract

The invention discloses a biological treatment method for waste mud in petroleum and natural gas exploration drilling work, which is characterized by comprising the following steps of: a, forming a microbial treatment layer, namely inoculating special microbial strains to the waste mud in a weight ratio of 3-5: 100, mixing the strains and the waste mud uniformly, stirring the mixture and natural soil with water content of 10 to 10 percent and grain diameter of less than 0.5 centimeter uniformly according to the density condition of the waste mud in a following mode to form the microbial treatment layer, adding the natural soil in an amount which is 2.5 to 3 times that of the waste mud into the waste mud with density of 1 to 1.5kg / L, adding the natural soil in an amount which is 2 to 2.5 times that of the waste mud into the waste mud with density of 1.5 to 2.5kg / L, and controlling the water content of the microbial treatment layer to be between 25 and 30 percent; b, treating the soil; and c, treating plants. The method can solve the technical problem that effusion enters underground water to pollute a water source because the natural soil with high water content and large grain diameter is easily scoured by hard rain under the condition that pollutants in a pretreatment mixture are not yet effectively degraded in the prior art.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and drilling pollution control, in particular to a treatment method for waste mud used in oil and gas drilling operations. Background technique [0002] Drilling waste mud is an important part of the oil and gas drilling process. In this industry, it is often called the "blood" of drilling. , will produce 300-400 cubic meters of waste mud, which is mainly composed of clay, drilling cuttings, weighting materials, various chemical additives (generally up to 40-50 kinds of inorganic and organic chemical processing additives), inorganic salts, and oil. The phase-stable suspension mixture has particularly complex components, great pollution hazards, and high pH value: generally 8.5-10.0, some as high as 11.0; COD as high as 10,000-100,000 mg / L; oil content is also high. [0003] At present, domestic disposal of oil and gas drilling waste mud mainly adopts direct landfill or solidificat...

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Problems solved by technology

[0017] In order to solve the above technical problems, the present invention proposes a method that can mix natural soil in different weight ratios for waste mud of different densities, so as to truly exert the activity of microorganisms, effectively degrade the organic compounds in waste mud, and achieve harmless Objective To provide a biological treatment method for waste mud in oil and gas exploration and drilling operations. At the same time, this method can also solve the problem of natural soil with excessive water content and particle size under the condition that the pollutants in the mixture in the previous treatment process have not been effectively degraded in the above-mentioned prior art. It is easy to be washed by heavy rain, which will cause seepage liquid to enter the groundwater and cause technical problems of water source pollution

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