Preparation method of high-temperature-resistant reversible emulsifier and application thereof in drilling fluid

Abstract

The invention discloses a preparation method of a high-temperature-resistant reversible emulsifier and an application thereof in drilling fluid. The technical scheme is as follows: the preparation method comprises the following steps: adding a mixture including 8 parts of dodecanamine, 72 parts of hexadecylamine and 180 parts of octadecylamine into a spray type reaction kettle; displacing the air in the kettle by using nitrogen to remove all the air; then heating to 100 DEG C while vacuumizing; sucking out materials from the inside of the reaction kettle and spaying the materials into the reaction kettle; adding 90 parts of ethylene oxide into the kettle while spraying for reacting for 4 hours; then preserving the heat for 1 hour, cooling to 70 DEG C and discharging; pouring obtained reactants into a stirring type reaction vessel; and keeping the temperature at 70 DEG C, adding 100 parts of white oil, further stirring for 0.5h; and adding 50 parts of a polyol type surfactant and 50 parts of a polyethylene glycol type surfactant, further stirring, and discharging after cooling to obtain the high-temperature-resistant reversible emulsifier. The high-temperature-resistant reversible emulsifier has the beneficial effects of good stability, strong inhibitive capability and easy maintenance.

Description

technical field [0001] The invention relates to a preparation method of a high temperature resistant reversible emulsifier, in particular to a preparation method of a high temperature resistant reversible emulsifier and its application in drilling fluid. Background technique [0002] Since the external phase is oil phase, compared with water-based drilling fluid, water-in-oil drilling fluid (referred to as oil-based drilling fluid) has strong inhibitory performance, good temperature resistance and excellent lubricating performance, and is widely used in Drilling and development of difficult wells and complex formations. However, since the external phase of the water-in-oil drilling fluid is oil phase, conventional water-in-oil drilling fluids are likely to cause changes in the wettability of cuttings and formations, resulting in difficulty in removing mud cake, low cementation strength during cementing, and waste Oil-based drilling fluids and environmental pollution caused ...

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Problems solved by technology

[0004] "Foreign Oilfield Engineering" magazine, August 8, 2008, published an article entitled "Research on Reversible Water-in-Oil Drilling Fluid Suitable for Drilling Horizontal Wells", which introduced an organic amine surfactant (code name : HN408) as a reversible emulsifier, but the structure and composition of the emulsifier are not given, nor is its preparation method given

"Fine Petrochemical Progress" magazine, Volume 10, No. 11, November 2009, published an article entitled "Reversible Oil-based Drilling Fluid System Preparation and Performance Evaluation", which introduced an organic amine surfactant ( Code: HN408) as a reversible emulsifier, but the structure and composition of the emulsifier are not given, nor is its preparation method given

"Petroleum Drilling Technology" magazine, Volume 41, No. 4, July 2013, published an article entitled "Laboratory Research on New Drilling Fluid System Based on Emulsion Phase Inversion Technology", which introduced a reversible emulsifier. The structure and composition of the emulsifier are given, and its preparation method is not given

"Guangdong Chemical Industry" magazine, Volume 40, Issue 17, September 2013, published an article entitled "A New Type of Oil-based Drilling Fluid—Research on Reversible Emulsified Oil-based Drilling Fluid", introducing an organic amine Surfactant-like (code: EMUL-A) can be used as a reversible emulsifier, but the structure and composition of the emulsifier are not given, nor is its preparation method given

"Petrochemical Application" magazine, Volume 33, Issue 7, July 2014, published an article entitled "Research and Analysis of Reversible Emulsion Reversal Process and Its Influencing Factors", which introduced a class of polyoxyethylene fatty amines Preparation of reversible emulsions as reversible emulsifiers, but the structure and composition of the emulsifiers are not given, nor is their preparation given

"Chemical World" magazine, April 4, 2015, published an article entitled "Synthesis and Properties of Emulsifiers for Reversible Oil-based Drilling Fluids", which introduced a preparation method for reversible emulsifiers. The emulsifier is synthesized from 9-octadecanoic acid methyl ester and hydroxyethyl ethylenediamine by amidation reaction, and the reversible emulsified drilling fluid prepared by this emulsifier is introduced at 50 ℃ properties, but the information does not address the behavior of the reversible emulsifier and the reversibly emulsified drilling fluid formulated with the emulsifier after high temperature aging

[0005] The patent number that Chinese patent announces: ZL03133993.X, has announced the preparation method of a kind of reversible emulsifier and its application in oil-based drilling fluid, but does not relate to this emulsifier and the reversible emulsified drilling fluid prepared by this emulsifier in Behavior after high temperature aging

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