Drilling well with drilling fluid of fluid phase and weighting agent
US7409994B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2006 |
| Grant date | Aug 12, 2008 |
| Priority date | — |
| Expiry date | Dec 28, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/906
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An additive that increases the density of fluids used in a wellbore during the construction or repair of oil, gas, injection, water, or geothermal wells comprises In one illustrative embodiment the additive comprises a weighting agent, and more preferably an ultra-fine weighting agent. Another embodiment includes a wellbore fluid containing an ultra-fine weighting agent that has an increased density with improved suspension stability without a significant viscosity increase. The wellbore fluid as described herein has rheological properties comparable to a conventional wellbore fluid. An illustrative embodiment of the claimed subject matter is further directed to a method for making the ultra-fine weighting agent and a method for using such ultra-fine weighting agent in a wellbore fluid. In one preferred embodiment the additive has a particle diameter between 4 μm to 15 μm. In another preferred embodiment, the additive has a D50 of approximately 3 μm (1 μm to 6 μm). In another preferred embodiment the additive has a D90 of approximately 6 μm (4 μm to 8 μm). The additive may be used in any wellbore fluid such as drilling, cementing, completion, packing, work-over (repairing), stimula…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.