Clean treatment technology for shale gas oil-based ash residues

Abstract

The invention belongs to the technical field of shale gas well drilling solid waste treatment, and particularly relates to a clean treatment technology for shale gas oil-based ash residues. After theshale gas oil-based ash residues and sludge ferment are mixed to be uniform according to the mass ratio of 1:(0.1-0.3); desalination is carried out until the salt content is smaller than 2 g / kg; a microbial agent accounting for 2% to 5% of the mass of the oil-based ash residues is added to the desalted mixture, uniform mixing is carried out, and micro-biological degradation is carried out for 3-6months; natural soil accounting for 30% to 60% of the oil-based ash residues is added to the mixture subjected to micro-biological degradation treatment to be mixed to be uniform. The shale gas oil-based ash residues treated through the technology can meet the requirement of plant greening planting.

Description

technical field [0001] The invention belongs to the technical field of shale gas drilling solid waste treatment, and in particular relates to a shale gas oil-based ash cleaning treatment technology. Background technique [0002] Oil-based cuttings is a solid waste of mixed formation cuttings and oil-based drilling fluid produced in the third oil-based drilling stage of shale gas drilling. The oil content of oil-based cuttings is 10% to 20%. Technical treatment, that is, put it into the heating reaction furnace through semi-automatic equipment, add a separating agent and stir, heat to about 270°C and react for about 10 hours to realize the separation of oil and cuttings, and control the oil content of oil-based cuttings after pyrolysis treatment Below 0.3%, the gray-black powder obtained is oil-based ash. The pH of shale gas oil-based ash is 8.0-8.6, the salt content is less than 20.0g / kg, the available potassium content is less than 488g / kg, the alkaline nitrogen is less th...

AI Technical Summary

Problems solved by technology

Most of the organic matter can be removed, but the equipment investment is large, the operating cost is high, the air pollution is generated during the incineration process, and the high salt content of the oil-based ash residue has a corrosive effect on the equipment

[0007] 4. Biological treatment, by adding a certain amount of microbial agents, controlling the corresponding inoculation amount, pH value, temperature, nutrient matrix and other conditions, to achieve natural degradation of petroleum, in petroleum-contaminated soil, oily sludge, etc. There are many applications; biological treatment is economical and safe, will not cause secondary pollution, does not require large-scale equipment, and is relatively simple to operate. It has a better treatment effect on moderately concentrated petroleum or soluble organic pollutants, but microbial treatment cannot degrade Contaminates all pollutants in the environment, and the degradation cycle is relatively long, and microbial activity is easily affected by temperature and other environmental factors

[0008] my country's shale gas development started relatively late. At first, shale gas oil-based ash was mainly disposed of in solidified landfills. Due to the large number of oil-based ash solidified landfill pools and the surrounding ecological environment is sensitive, the curing effect of oil-based ash is relatively low. Poor, the existing environmental risk is relatively large, in recent years, the solidified landfill has been re-disposed, that is, the oil-based ash solidified landfill is excavated for co-processing in cement kilns, which will cause many solidified landfill pools to be emptied , it needs a lot of soil resources to fill it and carry out ecological restoration

Images