Deep-well polysulfonate drilling fluid and preparation method thereof
US9926482B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 2017 |
| Grant date | Mar 27, 2018 |
| Priority date | — |
| Expiry date | Oct 27, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/062
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to the deep-well drilling fluid field, and discloses a deep-well polysulfonate drilling fluid and a method for preparing the deep-well polysulfonate drilling fluid. The drilling fluid contains water, bentonite, sodium carbonate, sulfomethylated phenolic resin, sulfonated lignite, halide salt, filtrate reducer, sodium polyacrylate, sodium bisulfite and barite, wherein, based on 100 parts by weight of water, the content of the bentonite is 3.5-5 parts by weight, the content of the sodium carbonate is 0.15-0.35 parts by weight, the content of the sulfomethylated phenolic resin is 6-8 parts by weight, the content of the sulfonated lignite is 6-8 parts by weight, the content of the halide salt is 7.5-12 parts by weight, the content of the filtrate reducer is 0.5-1.2 parts by weight, the content of the sodium polyacrylate is 0.8-1.7 parts by weight, the content of the sodium bisulfite is 3-5 parts by weight, and the content of the barite is 250-300 parts by weight; the drilling fluid has favorable properties such as low viscosity and low HTHP water loss, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.