Polymeric viscosifiers for use in water-based drilling fluids
US9926481B2 · kind B2 · utility
1Cited by
1References
20Claims
0Family size
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Key dates
| Filing date | Mar 31, 2015 |
| Grant date | Mar 27, 2018 |
| Priority date | — |
| Expiry date | Mar 31, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/065
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Systems and methods for drilling in a subterranean formation are disclosed. A method comprises providing a drilling fluid, wherein the drilling fluid comprises an aqueous fluid; a first polymer comprising 2-acrylamido-2-methylpropane sulfonic acid, vinylpyrrolidinone, pentaerythritol allyl ether, and methylenebisacrylamide; and a second polymer comprising acrylate, 2-acrylamido-2-methylpropane sulfonic acid, methacrylic acid, and allyloxy 2-hydroxy propane sulfonic acid. The method further comprises placing the drilling fluid into the subterranean formation and drilling a wellbore in the subterranean formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.