Reservoir protecting agent composition, drilling fluid for middle permeability reservoirs and use thereof
US9353305B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 2015 |
| Grant date | May 31, 2016 |
| Priority date | — |
| Expiry date | Oct 8, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/035
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present subject matter discloses a reservoir protecting agent composition, consisting of non-fluorescent sulfonated asphalt and a reservoir protecting agent, wherein, the reservoir protecting agent is composed of structural units denoted by the following formula (1), (2), and (3). The present subject matter further provides a drilling fluid that contains the above-mentioned reservoir protecting agent composition for middle permeability reservoirs. The present subject matter further provides an application of the drilling fluid for middle permeability reservoirs in well drilling in middle permeability reservoirs. The drilling fluid for middle permeability reservoirs disclosed in the present subject matter exhibits favorable rheology property, temperature tolerance property, and anti-collapse and protection performance when it is used in wall drilling in middle permeability reservoirs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.