Flow pattern regulator for synthesizing base drilling fluid, and preparation method thereof

Abstract

The invention discloses a flow pattern regulator for synthesizing a base drilling fluid, and a preparation method thereof. The flow pattern regulator is alkyl glucosamide containing two or more glucose chain segments, which is generated by reacting fatty acid or fatty acid methyl ester with glucose methylamine. The preparation method specifically comprises the following steps: adding glucose methylamine and binary or polybasic fatty acid / acid ester into a polar solvent, heating the obtained solution to 140-150 DEG C under the action of a sodium alcoholate catalyst, carrying out a reflux reaction for 4-5 h, evaporating away the polar solvent until no liquid drops out, cooling the obtained material to obtain a waxy solid, and drying and crushing the waxy solid to obtain the product. The flowpattern regulator for synthesizing the base drilling fluid has a low toxicity and is easy to degrade, and the molecular chain of the flow pattern regulator has a large number of polar groups such ashydroxyl groups and acylamino groups, so that the flow pattern regulator is prone to associating in a water-in-oil emulsion to form a weak gel form, so solid-phase particles are effectively tackifiedand suspended in a low-flow-rate state; and the gel state can be easily damaged under the action of external force such as pumping, so the drilling fluid recovers good fluidity, and increase of the mechanical drilling speed and improvement of the flushing capacity to the well wall are benefited.

Description

technical field [0001] The invention relates to the technical field of oilfield chemicals, in particular to a flow pattern regulator for synthetic-based drilling fluid and a preparation method thereof. Background technique [0002] Oil-based drilling fluid is a drilling fluid system composed of oil as the continuous phase, water as the dispersed phase, and emulsifiers, shearing agents, plugging agents, fluid loss reducers, alkalis and other chemical agents. Compared with water-based drilling fluid, it has the advantages of good lubrication, anti-pollution, high temperature resistance, strong suppression, and protection of oil and gas layers. Therefore, it is more and more widely used in deep and ultra-deep wells, complex structure wells, special formation wells, Extended reach horizontal wells and other difficult wells. [0003] However, with the increasing number of complex wells and stricter environmental regulations, higher requirements are placed on the performance of d...

AI Technical Summary

Problems solved by technology

However, organic soil will reduce the solid phase capacity of oil-based drilling fluid, pollute low-permeability reservoirs, and tend to thicken at high temperatures, resulting in deterioration of mud performance

Although butyl rubber, reaction products of isocyanate and polyols or aldehydes are also common tackifiers in oil-based drilling fluid systems, these products have disadvantages such as toxicity and difficult degradation, and are not suitable for continued use in synthetic-based drilling fluids. flow regulator

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