Equipment and process for collecting and treating drilling waste without falling to the ground

Abstract

The invention belongs to the field of well drilling environment-protective devices and especially relates to a device and a process of non-fall-to-ground collection treatment of well drilling wastes. The device includes a well drilling waste slurry collecting unit (1), a slurry dehydrating unit (2), a medicine adding unit (3) and a water treatment and recycling unit (4). The well drilling waste slurry collecting unit (1) includes a spiral conveyer (6) and a drying sieve (7); the slurry dehydrating unit (2) includes a diluting and destabilizing pot (10), a sludge mixing box (11), a sludge collecting box (12) and a sludge dehydrating machine (13); the medicine adding unit (3) includes a gel breaker adding apparatus (14) and a flocculating agent adding apparatus (15); and the water treatment and recycling unit (4) includes a coagulation precipitation tank (16), an active carbon adsorption pot (17), a dehydrate buffer box (18), a reuse water tank (19), an overflow liquid collecting tank (20) and a ultrafiltration reverse osmosis device (21). The whole process actually achieves non-fall-to-ground treatment of slurry and avoids pollution of the well drilling wastes on surrounding environment.

Description

Technical field [0001] The invention belongs to the field of drilling environmental protection equipment, and in particular relates to an equipment and process for non-landing collection and treatment of drilling waste. Background technique [0002] During the oil drilling process, a large amount of drilling waste is generated. Drilling waste is a very complex dispersion system, mainly composed of waste drilling mud, drilling waste water and cuttings, etc. It has the characteristics of oil, suspended solids, high content of heavy metal ions, large changes in water content, and difficulty in dehydration. , Is the main pollutant produced in the current petroleum exploration process. The content of toxic and harmful components in drilling waste is high, and if it is directly discharged, it will cause greater harm to the environment. Among them, the main chemical components that harm the environment are hydrocarbons, salts, various polymers, heavy metal ions, impurities in barite, ...

AI Technical Summary

Problems solved by technology

Although the drilling cuttings have a low moisture content, they are not easy to transport and clean up due to the large amount of mud attached to the surface.

At present, no suitable drilling waste collection and treatment equipment and technology have been developed in China. Most oilfields use solidification to treat drilling waste, that is, the drilling waste is discharged into the mud pit, and a large amount of curing agent is added to it to make it pass through. The chemical reaction achieves dehydration and solidification to form a solid substance similar to soil and bury it in situ

However, due to the limitation of the chemical properties of the curing agent itself, the harmful components in the solidified drilling waste will still be slowly released into the soil and groundwater, causing secondary pollution

In addition, this method requires a large amount of curing agent (accounting for about 1 / 3 of the total waste), which greatly increases the cost of treatment.

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