Discussion on harmless treatment technologies of drilling fluid waste in oil and gas fields

Drilling fluid waste is the multiphase stable suspension composed of clay, drilling cuttings, weighting materials, chemical additives, inorganic salts and oil, containing a variety of substances harmful to the environment, such as oil, chemical additives, heavy metals and macromolecule organic compound. The effects of drilling fluid waste on the environment is mainly reflected in following aspects: pollution of surface water and groundwater resources; hardening of soil is harmful to plant growth or even unable to grow, resulting in the soil can not be replanted; various heavy metals and chemical additives affect the growth of animals and plants, and even are enriched in animals and plants, thus endangering human health. It is unfavourable to the implementation of the strategic objective of sustainable development of the environment and economy, so the drilling fluid should be treated innocuously after drilling.