..., solubility effects, pipe rpm, etc. Some of the key outputs from the tool are wellbore profiles of pressure, foam-quality, density, velocity, viscosity, shear rate, friction pressure, and hydrostatic pressure. Another key input parameter, which is determined iteratively is the liquid and gas pumping rate...

... and maintenance system, including a helical pipe viscometer, Coriolis meter, chemical screw feeders, and peristaltic pumps. A MPC algorithm was developed and tested to control and adjust viscosity at multiple shear rates by controlling the rates of addition of the two polymers. Tests were performed at various...

... with shear rates from 10.22 to 0.001 s −1 and time-dependent oscillatory shear test with angular frequencies from 10.22 to 0.001 rad/s at constant strain amplitudes of 0.05% within linear viscoelastic (LVE) range and 100%, over a period of 10,800 s to closely compare to sag-prone conditions during...

... state conditions after a change from high to low shear rates, but that a change of shear rates from low to high is recovered very quickly. However, the thixotropic behavior of drilling fluids differs from other thixotropic fluids, as it needs considerable time to recover both from high to low and low...

... shear stress and viscosity are expressed as explicit functions of independent variables (shear rate, temperature, NP concentration) and the correlations are validated against experimental data. A new parameter set must be computed by nonlinear regression for each combination of conditions, a necessity...

... shear stress tangential velocity fluid layer drilling operation rotation speed axial flow fluid rheological property geometry drillpipe rotation shear rate Previous Work Over the years, many researchers have investigated the effect of drillpipe rotation on wellbore hydraulics...

... protocols and equipment that quantify the relationship between the fluid's shear stress and shear rate, as standardized by API. Usually, measurements are conducted at atmospheric pressure and standardized temperature. Therefore, these rheological properties are generally not representative of the actual...

... concentration, pH and particles content and size distribution. The authors conclude that simple viscometers based on vibration pins or ultrasound attenuation would not be able to measure properly the viscosity at the desired shear rate range. In order to achieve this goal, the authors propose a Couette...

... fluids and materials different pressure gelled structure drilling fluid property circulation composition drilling fluid chemistry drilling fluid formulation correlation procedure different temperature synthetic drilling fluid freezing phenomenon gelation shear rate spe iadc 105881...

...-hand side of Figure 24 ) Dynamic barite sag potential is generally low at high annular velocity, regardless of ultra-low shear rate viscosity. This is shown when comparing the right-hand side Figures 23 and 24 , where annular velocity is above 100 feet per minute. The data presented...

... results of the verification and validation testing on invert-emulsion drilling fluids. drilling fluid chemistry drilling fluid formulation viscometer atmospheric pressure drilling fluid property model 7600 model 75 field mud shear rate drilling fluid selection and formulation Upstream Oil...

... a behavior as described by equations (1) and (2) . In steady state at a shear rate γ ˙ s the structure parameter reaches the steady value λ s = 1 / α θ γ ˙ s and the shear stress writes: (3) σ S = μ 0 [ 1 + ( 1 α θ γ ˙ S ) n...

... was investigated in shear flow over the shear rate range 0.001 - 1000 s −1 , and in transient flow. Most fluids exhibited shear-thinning and thixotropic behavior that could not be described in terms of PV and yield point (YP) alone. Constitutive rheological models were used to describe the data for input...

... In the following example which is illustrated in Table 1 , the pump rate, or the annular velocity, is used as input to determine the wall shear rate by the application of Eq.2 . The calculations also show which calculated RPM these shear rates represent on a standard VG-meter 1 . The example...

... salts in the internal brine phases in synthetic and oil-based drilling fluids was found to have on sag performance in a series of tests. sag stability nh 4 drilling fluid property sag shear rate brine phase drilling fluid chemistry sodium formate potassium formate nh4ca upstream oil...

... by Cheng (Ref. 1 ). The Cheng model can be formulated in a representation where K and n are time and shear rate independent, while the thixotropy effects are introduced by making the yield strength t y both time and shear rate dependent: (2) τ = τ y 0 + τ y 1 ( λ...

.... rheological property mud rheology drilling fluid chemistry drilling fluids and materials rheometer viscosity apparent viscosity spe iadc 67736 different temperature drilling fluid formulation drilling fluid selection and formulation base oil drilling mud shear rate dependency prediction...

... drilling fluid management & disposal shear rate artificial intelligence drilling fluid property stability drilling fluids and materials rheology viscosity foam annular pressure drilling spe iadc 67691 liquid phase underbalanced drilling reservoir surveillance upstream oil & gas...

... foam drilling molecule rfdcf stability pollution shear rate drilling fluid formulation iadc spe 59267 permeability drilling fluids and materials fluid loss control repulsion drilling operation engineer recirculating foam drilling completion fluid well control drilling mud company...

... trips. Applying this model to high low-shear-rate-viscosity (LSRV) gels shows that they may perform well inside casing but are expected to do a poor job of hole cleaning in a narrow openhole horizontal annul us without rotation. Second, for turbulent flow in horizontal wells, the concept of using...