Portraits of the three rheology models are shown in Figure 2. For polymer-based WBMs, the Power Law model appears to provide the best fit of the three models; better yet is the Dual Power Law model: one for a low-shear-rate flow regimen annular flow and one for a high-shear-rate flow regimen pipe flow. More discussion is presented in the example below. Other models have been used too, including the Meter model also called the Carreau or Krieger-Dougherty model , which describes structured particle suspensions well, and the Casson model, which fits OBM data well.
However, neither of these models has been widely adopted by the drilling-fluid community. Measurement of Viscosity. Not only is the Bingham Plastic model easy to apply, it is also quite useful for diagnosing drilling fluid problems. Because electrochemical effects manifest themselves at lower shear rates, YP is a good indicator of contamination by solutes that affect the electrochemical environment. By contrast, PV is a function of the base fluid viscosity and concentration of solids.
Thus, PV is a good indicator of contamination by drilled solids. A simple statistical technique, such as least squares regression, is quite satisfactory. If a programmable computer is not available but the flow regimen of interest is clearly understood, two Fann Readings will usually suffice to estimate the values of K and n.
Naturally, this will lead to weighting of K and n to the Fann Speed range covered by those two Fann Readings. The value of K may be determined by substituting 0. Thus, none of the rheology models should ever be used to extrapolate outside of the range used for the data fit. The Herschel-Bulkley model is more difficult to apply, since the equation has three unknowns and there is no simple analog solution.
Skip to content Just as the nature of drilling-fluid solids affects the efficiency of solids control equipment, the nature of the solids also plays an integral role in the properties of drilling fluids , which in turn affect the properties of the solids and the performance of the equipment. The Power Law model can be expressed as follows: where K is dubbed the consistency and n the flow behavior index. Correct information is exchanged fast. A thorough understanding of the treatment and the effects of recommended wellbore actions is communicated through visual, sometimes animated, schematics.
You can prepare diagrams illustrating the various combinations of pipe strings. This lets you create realistic, multiple design options in one session. How do you print the wellbore diagrams? I can't seem to find a print icon or menu anywhere in this program. There is no print feature in the i-Handbook. However, if you right-click on the wellbore diagram as well as in most of the i-Handbook pages , you'll be able to copy the page content.
You can then "paste" what you've just copy in any Windows application that accepts pictures, like Word, WordPad, Excel, and Powerpoint. You can add your own annotation, add a title and date, and then print from there. When you are in the tubing or casing sections, just click on the little page icons bottom left to show the additional pages.
It contains the Drift Diameters Drift Dia. Can I install the i-Handbook on different computers? Can I copy the i-Handbook and give it to friends? Yes, you can install the i-Handbook on different computers. You can also copy and give the i-Handbook to friends, but you are not allowed to sell it.
However we encourage you to get the full version and to sign up to be informed when new versions will be released. This is an issue with the demo version of the i-Handbook when display settings use large fonts.
You can fix the problem by changing your display settings to use small fonts. To install i-Handbook, you will need administrator privileges on your computer and will need to run the installer as an administrator.
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