| 摘要 |
A drilling fluid and an invert emulsion fluid having utility for drilling, completing or working over subterranean oil and gas wells are disclosed. The drilling fluid includes a continuous phase that includes a preferentially-oil-soluble glycol ether which has a viscosity at 25 .degree.C (77 .degree.F) of at least 10 centipoise, and an emulsifier. The invert emulsion fluid includes an oleaginous fluid including a preferentially-oil-soluble glycol ether which is miscible in oil and is such that less than 10 % by volume of the glycol ether is miscible in fresh water at 20 .degree.C (68 .degree.F), that is to say 10 % by volume of the glycol ether mixed in fresh water results in two phases. The invert emulsion fluid also includes a nonoleaginous fluid and an emulsifier which i s functionally affective to stabilize the invert emulsion. In one embodiment, glycol ether is selected from propylene glycol n-butyl ether, dipropylene glycol n-butyl ether, tripropylene glycol n-butyl ether, tetra propylene glycol n-butyl ether, pentapropylene glycol n-butyl ether; hexapropylene glycol n-butyl ether; heptapropylene glycol n-butyl ether and combinations thereof. The fluids of the present invention may also contain weighting agents, bridging agents, wetting agents, corrosion inhibitors and other components of drilling fluids that ar e known in the art. |
