Sentence examples for cuttings concentrations from inspiring English sources

The pressure drop in the test section was recorded for variable flow rates, cuttings concentrations, pipe inclinations and rotation speeds.

Open image in new window Fig. 8 Effect of pipe rotation on the cuttings concentration distribution in both concentric and eccentric horizontal annulus (fluid velocity = 5 ft/s, foam quality = 90%%). Figure 9 shows the effect of pipe rotation on the cuttings velocity in both concentric and eccentric horizontal annulus.

A higher cuttings transport ratio means there is a relatively lower cuttings concentration in the wellbore.

In addition, inner flow domain transfers pressure, velocity, cuttings concentration, and other parameters through interface.

The pipe rotation also decreases the cuttings concentration in the annulus and minimizes bit sticking.

The cuttings concentration (c) in an annulus is defined as: c = Net volume occupied by cuttings Total annulus volume (15).

The cuttings transport ratio also can be expressed in terms of the cuttings concentration (c) in the annulus as follows: R T = 1 - c (14).

A reduction of the pressure gradient (Fig. 7) is caused by an increased shear rate and a decreased cuttings concentration, both due to the pipe rotation.

Pipe rotation not only reduces the cuttings concentration in the annulus but also leads to a reduction of the frictional pressure loss.

Buckingham-π theorem combined with least square method was applied to establish the empirical correlations for estimating cuttings concentration and annular pressure drop.

Major parameters affecting cuttings concentration can be defined as: V b V W = f ( θ, v, ω, ρ l, ρ s, μ, D h, g, d c ) (5).