A nano-slow-release capsule for scale inhibitor and a preparation method and application thereof

The scale inhibitor nano-slow-release capsules prepared by the emulsion curing method solve the problem of low scale inhibitor utilization, achieve high-efficiency scale inhibition effect, are suitable for oilfield exploitation, and have the characteristics of simple preparation process and low cost.

CN117923677BActive Publication Date: 2026-04-10CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (BEIJING)
Filing Date
2024-01-09
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

In existing technologies, scale inhibitors have low utilization rates and poor scale inhibition effects during oilfield development, and their preparation processes are complex or costly, making it difficult to achieve industrial application.

Method used

Nanoscale sustained-release capsules for scale inhibitors were prepared by emulsion curing. Hydroxyethylidene diphosphonic acid was encapsulated in a polymethyl methacrylate shell to form a W/O emulsion, which was then cured by heating to obtain nanoscale sustained-release capsules with a particle size of 320-720 nm, exhibiting high encapsulation efficiency and good sustained-release performance.

Benefits of technology

It achieves efficient utilization of scale inhibitors, has excellent slow-release performance, is suitable for large-scale industrial production, solves the problem of low utilization rate of scale inhibitors, and has good chemical stability and biocompatibility.

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Abstract

The application relates to the technical field of oilfield exploitation, and discloses a nano slow-release capsule for scale inhibitors and a preparation method and application thereof. The method comprises the following steps: (1) emulsifying a hydroxyethylidene diphosphonic acid-containing aqueous solution I, an oil phase and a nonpolar organic solvent to obtain a W / O emulsion; (2) performing heating and solidification treatment on the W / O emulsion to obtain the nano slow-release capsule for scale inhibitors; and the oil phase contains polymethyl methacrylate, an emulsifier and a polar organic solvent. The nano slow-release capsule has good slow-release performance, and solves the problem of low utilization rate of hydroxyethylidene diphosphonic acid in the process of scale inhibition in oilfield exploitation.
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Citation Information

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