Process and agents for controlling the swelling of clays in the presence of sea-water and clay-based muds
US4666613A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1984 |
| Grant date | May 19, 1987 |
| Priority date | — |
| Expiry date | Apr 16, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/904
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Process for controlling the swelling of clays of bentonite type clays in the presence of salt-water in the preparation of drilling fluids, comprising the steps of PA0 selecting at least one compound from the group of salifiable active compounds comprising PA0 cyanamide, hexamethylenetetramine, guanidine and aminoguanidine, PA0 those having the formula: EQU NH.sub.3-n [(CH.sub.2).sub.m --OH].sub.n (I) PA0 in which m is equal to 2, 3 or 4 and n to 1, 2 or 3 with the possibility, when m is equal to 3 or 4, of having a branched chain, PA0 those having the formula: EQU NH.sub.2 [(CH.sub.2).sub.m --NH].sub.n (CH.sub.2).sub.m --NH.sub.2 (II) PA0 in which m is equal to 2, 3, 4, 5 or 6 and n is a whole number from 0 to 10, PA0 derivatives of formula (I) and (II), PA1 preparing a concentrated mixture, also called premix, of bentonite and soft water, PA1 diluting the premix with salt water up to the concentration desired for the drilling fluid, PA1 introducing in the premix or in the soft water used for its preparation, or in the premix diluted with salt water, or in the salt water used for diluting the premix, an effective amount of the said a least one active compound without satisfying the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.