High-temperature resistant, high-strength, and thixotropic gel plugging agent and its preparation method and application

US11421140B2 · kind B2 · utility

Assignee

• CHINA UNIVERSITY OF PETROLEUM (EAST CHINA) · CN

Inventors

• Yingrui Bai · Qingdao, CN
• Jinsheng Sun · Qingdao, CN
• Kaihe Lv · Qingdao, CN
• Ren Wang · Beijing, CN
• Jingping Liu · Beijing, CN
• Xianbin Huang · Qingdao, CN
• Jintang Wang · Qingdao, CN
• Jiafeng Jin · Qingdao, CN

Key dates

• Filing date: Dec 3, 2020
• Grant date: Aug 23, 2022
• Expiry date: Dec 3, 2040

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B33/138
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A high-temperature resistant, high-strength, and thixotropic gel plugging agent is composed of 8-20% of acrylamide monomer, 0.05-0.5% of reactive polymer, 0.1-1.0% of organic polymer cross-linker, 3.0-8.0% of resin toughening agent, 1.0-5.0% of flow pattern regulator, 0.01-0.5% of cross-linking regulator by the weight in the water. The gel solution shows a low apparent viscosity during the shear flow and is easy to be pumped into the wellbore and then into the formation leakage layer; after the pumping stops, the gel solution shows rapidly increased viscosity and strong adhesive force, and form a high-strength barrier between the wellbore and the formation, preventing the drilling fluid from further leaking.