Controllable self-polymerization nanometer microsphere oil displacement agent and preparation method thereof

By preparing a controllable self-aggregating nanosphere oil displacement agent, its water absorption and swelling properties are utilized to block high-permeability layers and gradually penetrate into low-permeability layers, solving the problem of poor displacement effect of existing oil displacement agents in low-permeability layers and improving oilfield recovery.

CN116023590BActive Publication Date: 2025-11-21PETROCHINA CO LTD
4 Cites 0 Cited by

Patent Information

Application Number
CN202111250033.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-10-26
Publication Date
2025-11-21
Estimated Expiration
2041-10-26

AI Technical Summary

Technical Problem

Existing polymer-based oil displacement agents and polymer-based binary systems cannot effectively displace low-permeability layers in reservoirs during water injection development, resulting in low sweep efficiency and unsatisfactory recovery rates.

Method used

A controllable self-polymerizing nanosphere oil displacement agent is used. Nanospheres are prepared by suspension polymerization. The water absorption and expansion properties of the nanospheres are utilized to block the high-permeability layer and gradually penetrate into the low-permeability layer, thereby improving the oil displacement effect.

Benefits of technology

After being injected into the formation, the nanospheres absorb water and expand, blocking high-permeability layers, increasing the water absorption of low-permeability layers, improving oil displacement, expanding the water drive range, and enhancing oil recovery.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The application provides a controllable self-polymerization nanometer microsphere oil displacement agent and a preparation method thereof. The controllable self-polymerization nanometer microsphere oil displacement agent comprises the following components in parts by weight: monomer 15-25 parts, initiator 0.2-0.6 parts, crosslinking agent 0.05-0.1 parts, emulsifier 2-4 parts and solvent 120-190 parts. The controllable self-polymerization nanometer microsphere oil displacement agent mainly utilizes the characteristics of the initial small volume and the volume swelling of the nanometer microsphere, and can swell after being injected into the stratum, so as to achieve the purposes of plugging the superior pore channel, gradually penetrating and realizing oil displacement.
Need to check novelty before this filing date? Find Prior Art