Chelating agent for reservoir acidification and stimulating injection and its preparation method and application
US10876043B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2019 |
| Grant date | Dec 29, 2020 |
| Priority date | — |
| Expiry date | Feb 1, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/25
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A chelating agent may be used for reservoir acidification and stimulating injection. The raw material composition of the chelating agent comprises: 10.0%-20.0% of methanesulfonic acid, 10.0%-20.0% of methanol, 10.0%-20.0% of polyaspartic acid, 10.0%-15.0% of epoxy succinic acid, 5.0%-10.0% of sodium cetyl sulfonate, 10.0%-15.0% of cetyltrimethylammonium bromide and the balance of water. The present disclosure also provides a preparation method of the above chelating agent. The chelating agent for reservoir acidification and stimulating injection may be used in an acidizing and stimulating injection process, wherein it can effectively dissolve rock cracks, be used directly without need to be reversed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.