公开(公告)号：US11603488B2

公开(公告)日：2023-03-14

申请号：US16936174

申请日：2020-07-22

申请人： SOUTHWEST PETROLEUM UNIVERSITY ,  CNPC BOHAI DRILLING ENGINEERING COMPANY LIMITED

发明人： Xiaowei Cheng ,  Shuxun Zhao ,  Yang Yu ,  Zhihui Lin ,  Gaoyin Zhang ,  Chaoming Wu ,  Kaiqiang Liu ,  Wenming Liu ,  Zuwei Chen ,  Jiawen Fu ,  Tianpeng Zuo ,  Ben Qi ,  Chunmei Zhang ,  Zaoyuan Li ,  Sheng Huang ,  Xiaoyang Guo

IPC分类号： C09K8/467 ,  C04B24/40 ,  C07F5/06 ,  C07F15/02 ,  C04B103/22

摘要： 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.