METHOD FOR PRODUCING A COMPONENT FOR DRILLING FLUIDS WITH A LOW CONTENT OF AROMATIC HYDROCARBONS Russian patent published in 2021 - IPC C09K8/35 C09K8/34 C10G65/02 

FIELD: drilling.

SUBSTANCE: invention relates to methods for producing components for drilling fluids with a low content of aromatic hydrocarbons. In the method for producing a hydrocarbon component for preparing hydrocarbon-based drilling fluids with a pour point of no higher than minus 55°C and the content of aromatic hydrocarbons less than 0.5 wt.% as raw materials, paraffin wax produced at solvent oil deparaffinisation plants is used. Said paraffin wax is directed for hydrotreatment conducted at a pressure of 50 kg/cm² and a temperature of 300 to 310°C using a cobalt-nickel-molybdenum catalyst. The resulting hydrotreated wax is directed for hydro-paraffinisation conducted at a pressure of 50 kg/cm² and a temperature of 340°C using a catalyst containing platinum group metals. The hydro-paraffinisation product is directed for hydrofinishing conducted at a pressure of 48 kg/cm² and a temperature of 225°C using a catalyst containing platinum group metals. The hydrofinishing product is directed for rectification. A fraction extracted at the stage of rectification, the boiling limits whereof fall within the temperature range from 187°C to 360°C, is used as a component of drilling fluids.

EFFECT: production of a hydrocarbon component for drilling fluids suitable for use in difficult climatic conditions of the Arctic and offshore drilling with increased environmental requirements with a low pour point and a low content of aromatic hydrocarbons.

1 cl, 1 dwg, 5 tbl, 5 ex