Additive for increasing the density of a fluid for casing annulus pressure control
US7745380B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2009 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | Jan 15, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/906
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of treating a wellbore that includes circulating a wellbore fluid in the wellbore, wherein the wellbore fluid comprises an oleaginous base fluid and a wellbore additive colloidal solid material, and wherein the wellbore additive colloidal solid material is formed by grinding a solid particulate material and a polymeric dispersing agent for a sufficient time so that the polymeric dispersing agent is absorbed to the surface of the resulting colloidal solid particles and less than 10% of the resulting colloidal solid particles have a diameter greater than 10 microns, but not more than five percent of the particles are less than 0.2 micron in diameter, wherein the grinding is carried out in the presence of an oleaginous base fluid and wherein the grinding is carried out so that the wellbore additive colloidal solid material has a weight average particle diameter d50 less than 2.0 microns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.