The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 2023
Filed:
Jul. 22, 2020
Southwest Petroleum University, Chengdu, CN;
Cnpc Bohai Drilling Engineering Company Limited, Tianjin, CN;
Xiaowei Cheng, Chengdu, CN;
Shuxun Zhao, Chengdu, CN;
Yang Yu, Chengdu, CN;
Zhihui Lin, Chengdu, CN;
Gaoyin Zhang, Chengdu, CN;
Chaoming Wu, Chengdu, CN;
Kaiqiang Liu, Chengdu, CN;
Wenming Liu, Chengdu, CN;
Zuwei Chen, Chengdu, CN;
Jiawen Fu, Chengdu, CN;
Tianpeng Zuo, Chengdu, CN;
Ben Qi, Chengdu, CN;
Chunmei Zhang, Chengdu, CN;
Zaoyuan Li, Chengdu, CN;
Sheng Huang, Chengdu, CN;
Xiaoyang Guo, Chengdu, CN;
SOUTHWEST PETROLEUM UNIVERSITY, Chengdu, CN;
CNPC BOHAI DRILLING ENGINEERING COMPANY LIMITED, Tianjin, CN;
Abstract
The present invention relates to a process for preparing a metal-chelate retarder by a sol-gel method. The method comprises the following steps: weighing calcium nitrate tetrahydrate, aluminum nitrate nonahydrate and ferric nitrate nonahydrate according to a certain mass ratio and adding them into deionized water; placing the mixed solution on a magnetic stirrer and stirring the mixed solution evenly; adding citric acid monohydrate or gluconic acid, ethylene glycol or glycerol, and placing the mixed solution into a water bath to react to obtain the metal-chelate retarder. The process of the present invention has a reliable principle, overcomes the defects of long production period, complex preparation and the like of the existing retarders, has the advantages of simple process operation, cheap and easily available raw materials, and short production period. The prepared retarder has wide temperature adaptation range and adjustable thickening time, is suitable for large-scale industrial production, and has a wide market application prospect.