RU-2861615-C1 - METHOD FOR PRODUCING COMPONENT FOR DRILLING FLUIDS WITH LOW CONTENT OF AROMATIC HYDROCARBONS

RU2861615C1RU 2861615 C1RU2861615 C1RU 2861615C1RU-2861615-C1

Abstract

FIELD: chemical industry. 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 not higher than minus 50°C, an aromatic hydrocarbon content of not more than 0.3 mas.%, a flash point not lower than 105°C and a final product yield of not less than 85 mas.% based on the weight of the feedstock, a diesel fraction with a boiling range of 220-320°C is used as the feedstock, which is first sent for hydrotreating using an alumina-cobalt-molybdenum catalyst. The obtained hydrotreated diesel fraction is sent for catalytic isomerisation using a catalyst containing platinum group metals. The resulting diesel fraction isomerate is sent to a deep hydrogenation stage using a catalyst containing platinum group metals. The technological product formed after the deep hydrogenation stage is sent for rectification, where light fractions are distilled off and a fraction boiling within the range of 230-320°C is taken off, which is used as the hydrocarbon component for preparing hydrocarbon-based drilling fluids. EFFECT: possibility of use in harsh climatic conditions of the Far North and offshore drilling with increased environmental requirements. 1 cl, 1 dwg, 10 tbl, 5 ex

Inventors

Zhuravlev Aleksandr Vadimovich
Popov Aleksej Igorevich
Aleshin Aleksej Viktorovich
Naumov Pavel Anatolevich
Voloboev Sergej Nikolaevich

Dates

Publication Date: 20260506
Application Date: 20250311

Claims (4)

A method for obtaining a hydrocarbon component for the preparation of hydrocarbon-based drilling fluids with a pour point of no higher than minus 50°C, an aromatic hydrocarbon content of no more than 0.3 wt.%, a flash point of no lower than 105°C and a yield of the final product of no less than 85 wt.% of the mass of the feedstock, characterized in that the feedstock used is a diesel fraction with a boiling range of 220-320°C, which is first sent for hydrotreating using an aluminum-cobalt-molybdenum catalyst,
the resulting hydrotreated diesel fraction is sent to catalytic isomerization using a catalyst containing platinum group metals,
the resulting diesel fraction isomerizate is sent to the deep hydrogenation stage using a catalyst containing platinum group metals,
The process product formed after the deep hydrogenation stage is sent to rectification, where light fractions are distilled off and the fraction boiling in the range of 230-320°C is collected, which is used as a hydrocarbon component for the preparation of hydrocarbon-based drilling fluids.

Description

The invention relates to methods for producing components for drilling fluids with a low aromatic hydrocarbon content. The technical result is the production of a hydrocarbon component for drilling fluids suitable for use in the challenging climatic conditions of the Arctic and offshore drilling with increased environmental requirements, with a pour point no higher than minus 50°C, an aromatic hydrocarbon content of no more than 0.3% by weight, a flash point of no lower than 105°C, and a final product yield of no less than 85% by weight of the starting material. The starting material used is a diesel fraction with a boiling range of 220-320°C, which is first sent to hydrotreating using an aluminum-cobalt-molybdenum catalyst, the resulting hydrotreated diesel fraction is sent to catalytic isomerization using a catalyst containing platinum group metals, the resulting diesel fraction isomerizate is sent to the deep hydrogenation stage using a catalyst containing platinum group metals, the process product formed after the deep hydrogenation stage is sent to rectification, where light fractions are distilled off and a fraction boiling within 230-320°C is collected, which is used as a hydrocarbon component for the preparation of hydrocarbon-based drilling fluids. The invention relates to processes in the oil refining industry, in particular to methods for producing components for drilling fluids from oil refining products. Winter diesel fuel is currently used as a component of drilling fluids. (Ryazanov Ya.A., "Encyclopedia of Drilling Fluids," Letopis' Publishing House, 2005, p. 154). Winter diesel fuel has a flash point of approximately 30-40°C and a pour point of between -33°C and -40°C. The disadvantages of this component include its low flash point and, consequently, high fire hazard, as well as its high toxicity to the environment due to its high content of sulfur compounds and aromatic hydrocarbons. Furthermore, winter diesel fuel, with a pour point of -33°C to -40°C, is unsuitable for the preparation of drilling fluids suitable for use in the harsh Arctic climate due to its insufficient low-temperature properties. In addition to using diesel fuel as a hydrocarbon component for the preparation of hydrocarbon-based drilling fluids, low-viscosity, low-pour point base oils are currently used, which are characterized by a higher flash point, but also, as a rule, have a high content of aromatic hydrocarbons and, as a result, high toxicity to the environment. Synthetic oils are also known to be used as a hydrocarbon component in the preparation of hydrocarbon-based drilling fluids. Synthetic oils have a high flash point, low toxicity, and good low-temperature properties. The complexity of the production process for these oils and their high cost limit their use in the preparation of hydrocarbon-based drilling fluids. Despite the diversity of components for the preparation of hydrocarbon-based drilling fluids, there remains a need for hydrocarbon components with a low content of aromatic hydrocarbons (less than 0.3 wt.%), which are permitted for use in drilling conditions with increased environmental requirements, such as offshore drilling, including in the difficult climatic conditions of the Arctic shelf. A method is known for producing a component for drilling fluids (RU 2668612 C1) using vacuum gas oil or a mixture thereof with light vacuum distillates as the feedstock, which is subjected to hydrocracking with the separation of an unconverted hydrocracking residue, which is subjected to successive isodewaxing, hydrofinishing, fractionation, and a fraction boiling in the range of 195-305°C is collected, which is used as a component for drilling fluids. The disadvantage of this method is its inapplicability to refineries that do not have hydrocracking units, the low yield of drilling fluid components (no more than 10% by weight of the feedstock), and the flash point of the resulting product in the range of 88-90°C, which is not always acceptable for fire safety reasons. A method for producing a component for drilling fluids is known (RU 2761105 C1) using as a feedstock slack wax obtained in oil solvent dewaxing units, which is sent to hydrotreating carried out at a pressure of 50 kg/ cm2 and a temperature of 300-310°C using a cobalt-nickel molybdenum catalyst, the resulting hydrotreated slack wax is sent to hydrodewaxing, which is carried out at a pressure of 50 kg/ cm2 and a temperature of 340°C using a catalyst containing platinum group metals, the hydrodewaxing product is sent to hydrofinishing, which is carried out at a pressure of 48 kg/ cm2 and a temperature of 225°C using a catalyst containing platinum group metals, the hydrofinishing product is sent to rectification, and the fraction separated at the rectification stage is used as a component of drilling fluids, the boiling limits of which fit into the temperature range from 187°C to 360°C. The disadvantage of this method is the use of a difficult-to-ac