Filtrate reducer for oil-based drilling fluids and production method thereof

Abstract

The invention provides a filtrate reducer for oil-based drilling fluids and a production method thereof. The production method is characterized in that humic acid undergoes surface modification and the humic acid is grafted with an alkyl group of long carbon chain, and a product which has oleophylic emulsifying property and ammonium salt undergo polymerization so as to obtain the required product. The production method comprises the following concrete operations: stirring a certain amount of brown coal, caustic soda and water and reacting for a period of time, and extracting a humic acid solution; preparing grafted humic acid from the obtained humic acid solution and octadecylamine and octadecyl trimethyl ammonium chloride; preparing fatty acid amide from oleic acid, diethanolamine and concentrated hydrochloric acid; and preparing humic acid acetamide, dispersing, filtering and drying to obtain a finished product. According to the method, humic acid is modified to be grafted with the alkyl group of long carbon chain, and then the humic acid filtrate reducer has remarkable lipophilicity, can be dissolved or dispersed in oil and can be directly used in water-in-oil drilling fluids. Humic acid and amine are combined firmly, and high temperature resistance is strong. The product has a certain emulsification capability and good filtration reduction effects. The production method is simple, and the environment is not polluted.

Description

technical field [0001] The invention belongs to the technical field of oil field drilling, and in particular relates to a fluid loss reducer and a production method thereof. Background technique [0002] Due to the rapid increase in energy demand, especially the consumption of oil and natural gas, the drilling of oil and gas wells continues to deepen, the number of deep wells and ultra-deep wells increases, and the geological conditions become complex. The control of rheological properties becomes difficult, and higher requirements are put forward for drilling fluid and drilling fluid treatment agent. As one of the important treatment agents for water-based drilling fluid, fluid loss reducer plays an important role in ensuring safe, fast and efficient drilling. Among the drilling fluid treatment agents, fluid loss control agents are used in the largest amount and are of various types, mainly natural materials or modified products of natural materials and synthetic polymers....

AI Technical Summary

Problems solved by technology

However, humic acid fluid loss additives also have the following problems: the amount of humic acid fluid loss additives is generally 3%-5%, which is much larger than the addition of a few tenths of a percent of polymer treatment agents

In addition, a large amount will increase the solid content and affect the occurrence of side effects such as further treatment of mud; the water-soluble nature of humic acid cannot be directly used for water-in-oil drilling, which limits its application; the degree of aromatic condensation is high, and the chemical properties are poor. Limited salt capacity; product is black or brown, not conducive to high environmental standards

There is no better method to produce humic acid modified products with excellent performance, and this aspect needs to be improved

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