Coaxial cylinder viscosimeter calculations of coefficients. Cold water rheology kit fann instrument company is the leading manufacturer and a worldwide supplier of test and measurement instrumentation for the analysis of drilling, fracturing, completion fluids, and oil well cements. Drillwell d294 rheology modifier for oil based muds. If constant 511 is used, the unit of shear stress is g100 cms 2. The fann model 35 viscometer are direct reading instruments which are. Viscosity results for a cdp polymer support fluid viscometer test results and. By making certain measurement on a fluid, it is possible to determine how that fluid will flow under a variety of conditions including temperature, pressure and shear rate. A rapid screening method for testing stability to understand rheology of viscoelastic fluids, frequency dependence of their g and g material functions to be measured shear storage modulus g shear loss modulus g sudip kumar modh 12. Analysis of fann model 50 for fracturing fluid rheology. It should be noted that the recommended calibration of the model 35 is a linear or newtonian calibration. Operators use this kit with the model 35 when measuring rheological properties of drilling fluids at temperatures less than 70of 21. The test fluid is contained in the annular space or shear gap between the cylinders. Viscosity of a structured fluid as a function of shear rate and particle concentration1.
Rheological analysis of drilling fluid using marsh funnel. Product information rheology the science coaxial cylinder. Bentonite is commonly used as a drilling fluid additive for viscosity control during drilling of oil wells. On the rheological parameters governing oilwell cement slurry. Understanding rheology of structured fluids keywords. Model 35 viscometer instruction manual 208878 revision p, january 2016 10 3 features and specifications the fann directindicating viscometers are equipped with the standard r1 rotor sleeve, b1 bob, f1 torsion spring, and a stainless steel sample cup.
The apparatus used for the test is a concentric cylinder device couette flow commonly used in the oilfield fann vg 35 a. The fann model 35 viscometer is used around the world to determine the viscosity of drilling fluids and wherever viscosity measurements are. Rheology and api b2 paul, i have attached a copy of the current fann instruction manual for the model 35 viscometer. Dynamic viscoelasticity and dynamic sagging correlation of. Yet, various suppliers of micro compounders claim to be able to give reliable values for the melt viscosity and the corresponding shear rate and shear stress by rheological measurements in the backflow channel and analyzing these with proprietary software. Newtonian, its rheology is near enough to newtonian that this viscometer can be used and the viscosity calculated as though it were newtonian.
The viscous drag exerted by the fluid creates a torque on the inner cylinder or bob. The first requirement is that the power available matches the voltage labeled on the circulating chiller. An invert emulsion drilling fluid, and a method of drilling with such fluid, having improved rheology at low mud weights and high temperatures. It is used for those fluids which cannot be defined by a single value of viscosity and therefore require more parameters to be set and measured than is the case for a viscometer. Robert martinuzzi, department of mechanical and manufacturing engineering. Ranging from the simple marsh funnel to to rotational viscometers like the industry standard model 35 viscometer to the high pressure, high temperature ix77 rheometer, the fann line includes an instrument for any drillilng fluid testing need, in the field or in the lab. The improved rheology is effected with addition of hydrophobic amines, most preferably dimer diamines. Shale shakers effect on drilling fluids rheological properties. Fann 45 viscometer is more versatile because it can take rheology measurements at any speed between. The fann 75 rheometer measures similarly as the fann 35 rheometer but can measure rheology under high temperature and pressure. After the value of n is determined, k is calculated as. Heat or cool sample to desired test temperature of 115 2f.
Also known as directindicating viscometer or vg meter, an instrument used to measure viscosity and gel strength of drilling mud. Fann manufactures a variety of instruments to test the viscosity of a drilling fluid or mud. Shear ratesstresses an overview sciencedirect topics. Thiago pinheiro da silva enhanced fluid rheology characterization for managed pressure drilling. A fann 35 viscometer is used to measure shear stress and gel strength of drilling fluid samples. Dissertation submitted in partial fulfilment of the requirement for the bachelor of engineering hons chemical engineering. Pdf an improved estimation of shear rate for yield stress fluids. The fann 35 vg meter 6 speed data were plotted and the fluid model identified. Are the rheological properties of waterbased and synthetic. For shear flow to take place a shear force must act on the fluid.
The dial reading on the fann directindicating viscometer is in lb100 ft2, but note that the dial reading is not exact. Model 35 viscometer instruction manual fann instrument co. Rotation of the outer cylinder at known velocities is accomplished through precision gearing. Rotational viscometers that impose discrete rotational velocities, such as the fann 35a, are traditionally employed to evaluate the rheological properties of. The viscometer is a simple controlled shear rate type of instrument. Fann model 35 viscometers are versatile instruments for research or production use. Interpretation of viscometer test results for polymer. Extended rheological software the platform for polymer and. Measurement of fluid rheology and interpretation of rheograms second edition dr. The cold water rheology kit is an accessory for the fann model 35 viscometer. A fann35 viscometer is used to measure shear stress and gel strength of drilling fluid samples. From the use of u tube viscometers to measure the viscosity of newtonian liquids, we now use viscometers that routinely measure viscosity as a function of shear rate together with rheometers that can characterize the solidlike properties of the same material.
Research of rheological parameters of the drilling muds developed was made by fann viscometer, model 35 sa usa and the vsn3 rotational viscometer russia. Sep 08, 2011 the fann 75 rheometer measures similarly as the fann 35 rheometer but can measure rheology under high temperature and pressure. Drilling fluid is contained in the annular space between two concentric cylinders. Selecting the most appropriate model for rheological. Study of the rheological properties of various oilbased. Wyss weitzlab group meeng tutorial 10x10 35 0 5 10 strain 0 2 4 6 8 10 12 time s. The uppermost layer has maximum velocity while the bottom layer is stationary. Typically, ecopolxanlms is used at a concentration of 510 gal. An extruder is not a very accurate instrument to measure rheological data of the melt that is being processed.
Bottle from the 19th century bearing the inscription tinct ur rhei vin um darel. Page 32, table 75 indicates the conversion factors used by fann. Interpretation of viscometer test results for polymer support. The compositions of these samples formulation samples 6 are set forth in table 2a below and the results of these tests are graphed in figs. Model 35 viscometers are available in 6speed and 12speed models.
Both instruments are concentric cylinder viscometers that provide rheology measurements at ambient pressure and temperature from 0f to 150f 4. Laboratory study of high temperature additive to rheology. Bentone128 was added to compensate for the loss in viscosity, and at the respective time of sampling for the data measurements in this work, the owr of the fluid was 919 for the first batch and 955 for the last batch. On the rheological parameters governing oilwell cement.
An improved estimation of shear rate using rotating coaxial. In this research two types montmorilloniteclays clay of the taukentsky field of south kazakhstan and the tagansky field of east kazakhstan are used. Are the rheological properties of waterbased and synthetic drilling. The outer cylinder or rotor sleeve is driven at a constant velocity. Digital circulating bath doublewalled sample cup and insulating jacket. It illustrates one of the most important nonlinear effects in rheology, namely, the existence of normal stresses. Us8936111b2 invert drilling fluids having enhanced rheology. Other rotorbob combinations andor torsion springs can be substituted to extend the torque. Rheology is the science of deformation and flow of matter. Bentone128 was added to compensate for the loss in viscosity, and at the respective time of sampling for the data measurements in this work, the owr of the fluid was 919 for the first batch and. In the above equations, if fann 35 dial readings are multiplied by constant 1. Model 35 viscometer instruction manual fann instrument company. Pdf interpretation of viscometer test results for polymer support fluids. The model 35 viscometer is the best known and most commonly used fann viscometer.
Viscometer model 35 widely known as the standard of the industry for drilling fluid viscosity measurements. This means that if the sample fluid characteristics are extremely. Model 35 viscometers are direct reading, couette type, coaxial cylinder viscometers which, are used under laboratory and field conditions for determining the rheological characteristics of materials under prescribed conditions of shear stress torque and shear rate rpm. Finally, a comparison is made between these experiments and those obtained using a fann 35 fann instrument co. A basic introduction to rheology technology networks. Rheology after the sample preparation, the cement slurry is homogenized at a rotational speed of 150 rpm for 20 minutes in an atmospheric consistometer. Finally, the marsh funnel rheological results are also compared with the fann 35 viscometer results. Model 35 viscometer instruction manual expotech usa. As a result of this study more accurate fluid rheology measurements can be made with the fann model 50 viscometer if a realistic thermal and shear history are used, along with a bobsleeve combination which maximizes the fluid contained within the gap and minimizes circulation of gel plugs back into the gap. View and download fann dna 102410489 instruction manual online. Universiti teknologi petronas bandar seri iskandar 31750 tronoh perak darul ridzuan. Viscosity measured by a couette viscometer, such as the model 35, is a measure of the shear stress caused by a given shear rate. Evaluation of rheology and pressure losses for oilbased. Aqueous polymer solutions and bentonite suspension used for.
Solids are said to have an elastic response, and can resist. Fann produces a range of true couette coaxial cylinder rotational viscometers. Fann dna 102410489 instruction manual pdf download. A rheometer is a laboratory device used to measure the way in which a liquid, suspension or slurry flows in response to applied forces. The development of instrumentation to measure material properties has paralleled our understanding of their molecular properties. Rheologists describe the deformation and flow behavior of all kinds of material. We have confirmed these values were established by the original fann company more than 30 years ago. Using fann model 35 instructions this instruction is for both the 115 vac pn 31753 and the 230 vac pn 31754 cold water rheology kits. Rheological methods in food process engineering second edition james f. Rheological behavior of bentonite suspensions is very complex and it is very difficult to predict accurate shear rates from viscometer readings. The result of this work has provided both quantification of the effects of these factors and suggestions for improvement of the measurement. Invert drilling fluids having enhanced rheology and methods. The compositions of these samples formulation samples 6 are set forth in table 2a below and the results of these.
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