| 摘要 |
Nanomaterial compositions are useful for applications in drilling and completion fluids as enhancers of electrical and thermal conductivity, emulsion stabilizers, wellbore strength improvers, drag reduction agents, wettability changers, corrosion coating compositions and the like These nanomaterials may be dispersed in the liquid phase in low volumetric fraction, particularly as compared to corresponding agents of larger size. Nanofluids (fluids containing nano-sized particles) may be used to drill at least part of the wellbore. Nanofluids for drilling and completion applications may be designed including nanoparticles such as carbon nanotubes. These fluids containing nanomaterials, such as carbon nanotubes, meet the required rheological and filtration properties for application in challenging HPHT drilling and completions operations. |
| 主权项 |
1. A drilling fluid having increased rheological stability comprising:
a base fluid selected from the group consisting of an aqueous fluid, a non-aqueous fluid and combinations thereof, where the base fluid comprises a continuous phase; solid particles suspended in the continuous phase; and nanoparticles having a size less than 999 nm, selected from the group consisting of silica, magnesium oxide, iron oxide, copper oxide, zinc oxide, nickel oxide, alumina, boron, carbon black, graphene, carbon nanotubes, ferromagnetic nanoparticles, nanoplatelets, surface-modified nanoparticles, halloysite clay nanotubes, polymer-based nanoparticles, degradable nanoparticles, nanocapsules, mesoporous nanoparticles, multistimuli-responsive nanospheres, core/shell nanoparticles, and combinations thereof;where the nanoparticles are present in the fluid in an amount effective to improve the rheological stability of the fluid over a temperature range from ambient up to about 320° C. and a pressure range of about atmospheric pressure up to about 350 MPa, as compared with an identical drilling fluid absent the nanoparticles. |
