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

E - Fixed Constructions

21

B

255/25

E21B 21/12 (2006.01) E21B 7/04 (2006.01) E21B 21/00 (2006.01)

Patent

CA 1218052

METHOD FOR IMPROVING CUTTINGS TRANSPORT IN DEVIATED WELLS 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.

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