US 12,378,460 B2
Plugging agent for oil extraction in oilfield and a preparation method therefor and application thereof
Jinbiao Yang, Beijing (CN); Zhuo Yi, Beijing (CN); Xi Liu, Beijing (CN); Lunyu Zhu, Beijing (CN); Zhao Fang, Beijing (CN); Xiaona Hu, Beijing (CN); Yajing Li, Beijing (CN); and Ruiqi Zhang, Beijing (CN)
Assigned to CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and SINOPEC (BEIJING) RESEARCH INSTITUTE OF CHEMICAL INDUSTRY CO., LTD., Beijing (CN)
Appl. No. 18/257,923
Filed by CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and SINOPEC (BEIJING) RESEARCH INSTITUTE OF CHEMICAL INDUSTRY CO., LTD., Beijing (CN)
PCT Filed Oct. 27, 2021, PCT No. PCT/CN2021/126751
§ 371(c)(1), (2) Date Jun. 16, 2023,
PCT Pub. No. WO2022/134839, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 202011552715.X (CN), filed on Dec. 24, 2020; application No. 202011552736.1 (CN), filed on Dec. 24, 2020; application No. 202011554138.8 (CN), filed on Dec. 24, 2020; and application No. 202110049341.8 (CN), filed on Jan. 14, 2021.
Prior Publication US 2024/0052232 A1, Feb. 15, 2024
Int. Cl. C09K 8/42 (2006.01); C09K 8/44 (2006.01)
CPC C09K 8/426 (2013.01) [C09K 8/44 (2013.01)] 8 Claims
 
1. A plugging agent for oil extraction in an oilfield, wherein the plugging agent comprises a ligninamide, an acrylamide-based polymer, a cross-linking agent and a stabilizer.