While drilling processing method for oily drilling cuttings

Abstract

The invention discloses a while drilling processing method for oily drilling cuttings. The method includes the steps of oily drilling cutting preprocessing, oily drilling cutting system washing, soli-liquid separating, and the like. Oily drilling cuttings generated in the drilling process are rapidly processed, no secondary pollution is generated in the processing work, the oil content of the processed oily drilling cuttings is lowered to 1% or lower, and collected oil can continue to be prepared into oil-based drilling fluid.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to a method for processing oily drilling cuttings. Background technique Background technique [0002] Oil-based mud drilling has certain advantages in the construction of complex wells or horizontal wells, but solid waste such as waste mud and oily drilling cuttings will be generated during its use. In the oil-based mud used in my country at present, the oil-based mud uses diesel oil, white oil, etc. as the base oil, and various oilfield chemicals and barite are added. According to the Ministry of Environmental Protection's "Hazardous Waste List", the oily drilling waste during the development of oil and gas fields is marked as hazardous waste. At the same time, part of the mud in the waste oil-based mud and the base oil adsorbed on the surface of the solid phase are important resources and can be recycled. [0003] The oil-based oily drilling cuttings and waste oil-based m...

AI Technical Summary

Problems solved by technology

The microbial metabolic degradation method is mainly based on centrifugal separation, which uses the density difference between the oil-solid phase to achieve separation. The separated low-oil solid phase uses the metabolism of microorganisms to decompose oily substances, but requires suitable growth conditions and other nutrient media. The metabolic cycle of the oil is usually longer; microbial metabolism is to metabolize and decompose petroleum substances, which is a simple process of treatment and disposal, which is not conducive to the recovery and resource utilization of base oil substances

Thermal fractionation uses relative volatility difference to separate, high separation temperature and high energy consumption

The pyrolysis method uses anaerobic pyrolysis separation. It is necessary to ensure anaerobic heating to 500-1000°C. The equipment investment is large and energy consumption is large. During high temperature treatment, heavy hydrocarbons will condense and coke, resulting in large oil loss and residual oil content after treatment. high

The incineration method achieves the removal of oil-based mud pollution by combusting it with fuel, but its treatment cost is high, and it may cause secondary pollution at the same time

The organic solvent cleaning method uses the extraction principle to extract the base oil in the solid phase, and then recovers the organic solvent through heating and distillation. However, most of the organic solvents that can be used have certain toxicity. When the organic solvent vapor concentration There is also the possibility of explosion at higher

At the same time, in oilfield development projects, some oil wells are far away, and they are transported by truck to the centralized processing station for treatment. After treatment, the mud is transported back to the well site for recycling, and the transportation cost is relatively high.

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