Wellbore cementing method
US5335725A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 23, 1993 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Jul 23, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/13
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for cementing a wellbore wherein a slurry comprising at least five percent by weight of particles having a particle size greater than about 0.04 inches is placed in the wellbore. The slurry has a density which exceeds the hydraulic fracture gradient of the formation but the slurry is not lost to fractures because the larger particles enable the solids in the slurry to bridge and prevent excessive slurry loss. The cement slurry of the present invention is preferably placed in the wellbore by a direct placement method such as a coil tubing placement to minimize the pressure placed on the formation by any particular cement slurry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.