Plugging agent with temperature-resistant, salt-resistant and high-expansion for plugging large fractures and preparation method thereof
US10889745B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2020 |
| Grant date | Jan 12, 2021 |
| Priority date | — |
| Expiry date | Sep 15, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/763
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A plugging agent with temperature-resistant, salt-resistant and high-expansion for plugging large fractures and a preparation method thereof of the present disclosure are provided, the plugging agent system consists of the following components: main agent: 6%˜10%, cross-linking agent: 0.6%˜1%, initiator: 0.006%˜0.01%, additive: 6%˜14%, and the rest being water; the preparation method includes the following steps: adding montmorillonite to water to prepare a montmorillonite dispersion system; adding the main agent, the cross-linking agent and the initiator to the montmorillonite dispersion system to prepare a main agent solution; putting the main agent solution into an oven with a temperature range with 90˜20° C. for 9˜48 h to obtain gelation, the adhesive strength of the agent system can reach grade H, with 50˜80 expansion multiple, good strength after being expanded and good water plugging effect under the condition of a temperature of 140° C. and 250,000 degree of mineralization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.