Particulate profile control agent self-adaptive to size of formation pore throat and preparation method thereof

US11015109B2 · kind B2 · utility

Assignee

• Southwest Petroleum University · CN

Inventors

• Fayang Jin · Chengdu, CN
• Daijun Du · Chengdu, CN
• Wanfen Pu · Chengdu, CN
• Xiang Li · San Diego, US
• Ye Ju · Chengdu, CN
• Kexing Li · Chengdu, CN
• Lin Sun · Chengdu, CN
• Rui Liu · Madison, US
• Shuyu Song · Chengdu, CN
• Mian Wang · Malden, US
• Wei-Chuan Liao · Nanjing, CN
• Desheng Qian · Chengdu, CN

Key dates

• Filing date: Oct 15, 2020
• Grant date: May 25, 2021
• Expiry date: Oct 15, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K8/588
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A particulate profile control agent self-adaptive to a size of formation pore throat and a preparation method thereof include: raw materials and mass fraction for preparing a system including a main agent of 0.04˜0.2%, a nucleating agent of 0.005˜0.01%, a crosslinking agent of 0.002˜0.04%, an additive of 0.005˜0.01% and water. The preparation method includes: adding the main agent in proportion to the water and evenly mixing the mixture of the main agent and the water, and then adding the additive, the crosslinking agent and the nucleating agent in turn so as to form the profile control agent; pumping the profile control agent into the formation to be reacted at a reservoir temperature for a period of time to form colloidal particles on the spot for sealing off a high-permeability layer. The present disclosure is of easy operation and low cost, low initial viscosity and good injectivity.