Emulsifier for high-temperature-resisting oil-based drilling liquid and preparation method thereof

Abstract

The invention discloses an emulsifier for high-temperature-resisting oil-based drilling liquid. The emulsifier consists of the following raw materials in parts by weight: 12 to 30 parts of oleic acid; 1 to 10 parts of oleic diethanolamide; 1 to 10 parts of sodium fatty alcohol polyoxyethylene ether carboxylate. The preparation method comprises the following steps: measuring raw materials, mixing and stirring the oleic acid and oleic diethanolamide in a stirrer for 10 to 20 minutes, adding the sodium fatty alcohol polyoxyethylene ether carboxylate, and uniformly stirring. The emulsifier is high in temperature resistance, can resist the temperature of 200 DEG C, and is suitable for the drilling liquid in various oil-water ratios; the tension on an oil-water interface can be greatly reduced; a high-strength interface film can be formed, and an emulsification function can be realized. The emulsifier is simple in components, wide in source and low in cost. The preparation method is simple to operate, convenient to prepare and suitable for the industrialized mass production.

Description

technical field [0001] The invention relates to the technical field of petroleum resource exploration and development, in particular to an emulsifier for high-temperature resistant oil-based drilling fluid and a preparation method thereof. Background technique [0002] With the deepening of my country's petroleum exploration and development, more and more technical difficulties and complex situations are faced in drilling construction, such as drilling high-temperature and high-pressure deep wells, highly inclined directional wells, extended-reach horizontal wells and super water-sensitive formations. complex formation wells. Oil-based drilling fluids have some incomparable advantages over water-based drilling fluids, such as high temperature stability, high permeability recovery value, good lubricity, less oil layer damage, good wellbore stability and shale inhibition, and a wide range of density adaptation. The performance is stable under high density, which can greatly re...

AI Technical Summary

Problems solved by technology

[0003] However, compared with foreign countries, domestic oil-based drilling fluid technology still has a certain gap in the development and application of key treatment agents. The main shortcomings of domestic oil-based drilling fluid technology are: first, there are few types of treatment agents, especially supporting treatment agents. The performance is not ideal, and the high temperature resistance is poor; the second is that the oil-based drilling fluid system is single and the degree of commercialization is low; the third is that the field application research of oil-based drilling fluid is not enough, including the preparation process and maintenance process, and the field application is not popular; the fourth is There are few studies on the treatment of waste oil-based drilling fluid

Emulsifier is the core treatment agent in the key treatment agent of oil-based drilling fluid. In recent years, domestic research on emulsifier has been carried out, and some achievements have been made. However, the high temperature resistance of emulsifier is poor, and it is easy to Thermal decomposition loses its effect, resulting in a significant drop in the electrical stability of the oil-based drilling fluid system, and precipitation of barite, seriously affecting the overall performance of the system

Images