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An oil-based drilling and treatment method technology, applied in the field of waste treatment, can solve the problems of immature technology, experimental stage and low safety.
Active Publication Date: 2021-10-22
YANAN UNIV
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Problems solved by technology
This method has a high recovery rate for petroleum, but its technology is still in the experimental stage, and the technology is not yet mature enough to realize quantitative production.
[0008] (5) The sealed burial method in pits and safe formations is a special kind of landfill method. This method cannot recover oil and is less safe. Once leaked, it will cause damage to soil, water resources and the environment to a large extent. unpredictable risk
[0009] Among them, although the chemical treatment method has some disadvantages, its treatment process is relatively simple, easy to meet the quantitative treatment requirements, and the cost is relatively low
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Embodiment 1
[0036] see figure 1 As shown, the embodiment of the present invention provides a treatment method for oil-based drilling waste, comprising the following steps:
[0038] S2. After mixing the solid phase A1 of S1 with water, heat to 45° C., then add 0.5% surfactant by mass of the solid phase raw material, stir for 30 minutes, and centrifuge to obtain solid phase A2 and liquid phase B2;
[0039] Wherein, the surfactant is fatty acid methyl ester ethoxylate sulfonate;
[0040] S3. After mixing the liquid phase B1 of S1 and the liquid phase B2 of S2, adjust the pH of the solution to 7.0, heat to 45°C, add a demulsifier, mix evenly, ultrasonicate for 10 minutes under stirring conditions, centrifuge, and recover the oil phase, Mixture D is obtained;
[0041] Among them, the mass ratio of surfactant to demulsifier is 1:1;
[0053] In S3, adjust the pH of the solution to 8.0; the heating temperature is 60°C; the ultrasonic time is 30 minutes;
[0054] Among them, the demulsifier is hydroxyl silicone oil modified waterborne polyurethane resin; the mass ratio of surfactant to demulsifier is 1:3.
[0055] In S4, the stirring time is 2h;
[0056] Wherein, wherein, the mass ratio of flocculant and heavy metal remover is 3:1;
[0068] Wherein, wherein, the mass ratio of flocculant and heavy metal remover is 2:0.5;
[0069] The flocculant is polysilicate ferricsulfate;
[0070] The heavy metal remover is a dithiocarbamate derivative;
[0071] In S5, the mass ratio of curing agent, surface modifier, adhesive and water is 15:2:4:20;
[0072] Curing agents include sodium methyl silic...
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Abstract
The invention provides a treatment method for oil-based drilling waste. Firstly, the oil-based drilling waste is centrifugally separated by a multi-frequency centrifuge, and the separated solid phase is treated with a surfactant to remove the oil adsorbed on the solid phase. , and then combine the treated liquid phase with the centrifuged liquid phase, separate the oil from water by means of demulsification and ultrasound, and then settle the water phase by flocculation and heavy metaliontrapping agent, and the separated The water phase can continue to be recycled, while the solid phase is combined with the solid phase after surfactant treatment, and the harmful heavy metal ions are chelated and adsorbed by means of curing, surface modifier and adhesive to form a stable structural load in the curing agent. The method of the invention can effectively recover oil, reduce the oil content in drilling solid waste to below 0.08%, the solid waste finally reaches the national solid waste discharge standard, and is applied to road surface reconstruction projects, which is economical and environmentally friendly.
Description
technical field [0001] The invention relates to the technical field of waste treatment, in particular to a treatment method for oil-based drilling waste. Background technique [0002] In the drilling and development of oil and natural gas, oil-based mud with oil as the continuous phase is often used, but after use, it often encounters the problem of oil-based drilling waste disposal. Oil-based drilling waste usually contains a large amount of mineral oil, organic matter and various heavy metal substances. Direct discharge will pollute the environment and has been included in the national hazardous wastelist. Therefore, how to treat oil-based drilling waste in an environmentally friendly, safe and effective manner has become a key issue that people are currently paying attention to. [0003] At present, domestic and foreign treatment methods for oil-based drilling waste mainly include: [0004] (1) Dehydration-biological treatment method is to dedry and separate oily drill...
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