Drilling fluid thinners
US5124312A · kind A · utility
Inventor
Key dates
| Filing date | Apr 11, 1991 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Apr 11, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/203
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to drilling fluid additives, more particularly to superior drilling fluid thinners or polyfunctional drilling fluid conditioners, and methods of their preparation. The thinners comprise chelates and complexes prepared by reaction of sulfonitrohumic acid and sulfolignin with compounds of elements of Groups IVB and VIII of the periodic table, and especially titanium zirconium iron sulfolignin sulfonitrohumates, as well as mixture formed in the reaction. These chelates are stable, and are readily binded with clay and have a good heat resistance. The thinners of the present invention can remarkably reduce viscosity, yield point, gel strength and water loss of well-drilling fluids, and have a high salts and calcium resistivity, and can be widely used in extracting and exploiting petroleum, natural gas, geothermal fluids and underground water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.