Method for improving cuttings transport in deviated wells

Details Method for improving cuttings transport in deviated wells Method for improving cuttings transport in deviated wells

1983-05-02

1985-01-29

Novosad, Stephen J.

Boring or penetrating the earth

Processes

Boring with specific fluid

175 61, E21B 4300

Patent

active

044960123

ABSTRACT:
An improved method of drilling a deviated well is effected by injecting a slug or series of slugs of a shear thickening fluid down the drill string ahead of the drilling fluid and into the annulus formed about the drill string to displace cuttings that accumulate in the annular regions where the drill string lies near the lower side of the deviated portion of the borehole thereby increasing cuttings transport efficiency. The shear thickening fluid has characteristics that enable it to dislodge and disperse the accumulated cuttings in that it undergoes a reversible, isothermal, increase in viscosity when subjected to an increasing shear rate. Slug volumes vary between 0.05 and 5 percent of the annulus volume between the drill string and the wellbore wall.

REFERENCES:
patent: 2043504 (1936-06-01), Blow
patent: 2252669 (1941-08-01), Cross et al.
patent: 3040821 (1962-06-01), Widess
patent: 3461980 (1969-08-01), Kelley, Jr.
patent: 4289631 (1981-09-01), Luxenburg
"The Amatuer Scientist" by Jearl Walker.

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