Preparation method of polyalcohol anti-collapse inhibitor for environment-friendly drilling fluid salt slurry system

Abstract

The invention relates to a polyalcohol anti-collapse inhibitor for a drilling fluid salt slurry system and a preparation method of the polyalcohol anti-collapse inhibitor for the environment-friendlydrilling fluid salt slurry system. The preparation method comprises the following preparation steps: (1) weighing ethylene oxide or / and propylene oxide, ethylene glycol or glycerol as reactants, uniformly stirring the components at room temperature, and slowly pouring the mixture into a high-pressure reaction kettle; (2) adding a proper amount of catalyst, continuously introducing nitrogen for protection, controlling the reaction temperature at 75-125 DEG C and the pressure at 0.1-0.3 MPa, and continuously stirring the components; (3) after reaction for 60 minutes, opening a safety relief valve, removing residual pressure in the high-pressure reaction kettle, and discharging a synthetic product everywhere; (4) washing the by-product and redundant reactants with distilled water or a hydrochloric acid solution or NaOH solution with the concentration of 0.1% until the pH value is neutral; and (5) removing water from the product obtained in the step (4) to obtain the polyalcohol anti-collapse inhibitor. The product has excellent anti-sloughing inhibition performance, and the lubricity of the drilling fluid is remarkably improved.

Description

technical field [0001] The invention relates to a polyalcohol anti-slump inhibitor for a drilling fluid salt slurry system, and a preparation method of a polyalcohol anti-slump inhibitor for an environment-friendly drilling fluid salt slurry system. Background technique [0002] With the continuous development of petroleum exploration and development, in order to find more petroleum resources, it gradually develops from shallow wells and simple wells to deep wells, ultra-deep wells and complex wells. During this development process, problems such as pipe sticking and collapse caused by the dispersion of shale hydration and hydration have caused losses of tens of billions of dollars to drilling companies every year. Therefore, the development of new drilling fluid treatment agents with strong inhibition and stable borehole wall has always been one of the main development directions of drilling fluids. [0003] Polyalcohol drilling fluid is a new type of environmentally frien...

AI Technical Summary

Problems solved by technology

[0004] Although the development of polyalcohol drilling fluids has a history of nearly 20 years, there are still many controversies in the theoretical research on polyalcohol treatment agents, especially the use of polyalcohol is generally compounded with salt, and the negative effects of salt Obviously, therefore, this patent makes a breakthrough on this point, develops a polymeric alcohol anti-slump inhibitor for drilling fluid salt slurry system, which is specially used in the field of oilfield drilling, and provides a kind of polyalcohol anti-slump inhibitor for drilling fluid salt slurry system Preparation