Experimental characterization of some water soluble polymers used in drilling and completion fluids

Gürbüz, Berkay
Properly preparing the drilling fluid is an essential part of any successful drilling operation, especially in complex operations like deviated and horizontal drilling. Understanding the flow behavior of the polymers used in the drilling fluids under different conditions takes a key part in this preparation. In this study, shear rheology of some traditionally used water soluble polymers in drilling and completion fluids; namely PAC (polyanionic cellulose) and xanthan gum, were investigated experimentally. Instead of an oilfield standard Fann Model 35 Viscometer, an Ofite Model 900 Viscometer was used because of its capability to measure at ultra-low shear rates. Effects of the concentration of the polymer, time of shear applied, test temperature and effects of aging were examined. Rheological measurements were conducted between the shear rate ranges of 0.01 to 1000s-1 with concentrations changing from 0.25 to 1.5 grams of polymer per 350 milliliters of water (equivalent to 0.25 to 1.5 lb/bbl). Rheograms were constructed to identify the effect the polymers in question have on the flow characteristics of the drilling fluid. An appropriate constitutive model was used to define the flow behavior of the polymer in question mathematically. It was observed from the constructed rheograms that increase in polymer concentration results in consistent increase of apparent viscosity. Amount of time of shear does not affect the selected polymers if they are dynamically aged at least for two hours. Also as expected increasing temperature of the sample lowers the apparent viscosity considerably.


Experimental investigation of the effect of temperature on friction pressure loss of polymeric drilling fluid through vertical concentric annulus
Gürçay, Kazım Onur; Akın, Serhat; Gücüyener, İsmail Hakkı; Department of Petroleum and Natural Gas Engineering (2018)
Accurate estimation of friction pressure loss through annulus is important to avoid lost circulation, pipe sticking, kicks or more serious problems in drilling and well completion operations. Several studies have been performed to determine friction pressure loss experimentally and theoretically through pipe and annulus with the effects of eccentricity, pipe rotation, annulus geometry or flow regime by applying several rheological models. However, in addition to all of these factors, fluid rheology is depen...
Hydraulics optimization of foam drilling in drilling operations
Özer, Ceren; Özbayoğlu, Evren; Department of Petroleum and Natural Gas Engineering (2009)
In drilling, drilling fluid affects every single step of operation. If rig system is thought as the human body, drilling mud can be defined as the blood system of it. Drilling fluid carries the cuttings, cools the bit, it conditions the hole and so on. Some special kinds of drilling fluids are used for special purposes such as underbalanced drilling. Underbalanced drilling is generally used to prevent formation damage, lost circulation and to increase the penetration rate.Since 1980’s foam is used as drilli...
Experimental Investigation of the Effect of Temperature on Friction Pressure Loss of Polymeric Drilling Fluid Through Vertical Concentric Annulus
Gürçay, Kazım Onur; Akın, Serhat; Gucuyener, Hakkı (null; 2019-02-14)
Accurate estimation of annular friction pressure loss is necessary to perform drilling and well completion operations without lostcirculation, pipe sticking or more serious well control problems. Determination of friction pressure loss for Newtonian and non-Newtonianfluids has been investigated in several experimental and theoretical works by considering the effects of eccentricity, pipe rotation or pipegeometry. However, there is a gap in the studies about the temperature effect that is important especiall...
Numerical modeling of counter-current spontaneous imbibition during underbalanced drilling
Naseri, Masoud; Sınayuç, Çağlar (2012-09-10)
Mud solid and filtrate invasion are the most common causes of formation damage during overbalanced drilling (OBD), which is a method of drilling in which the wellbore pressure remains greater than formation pressure. During the past ten years, underbalanced drilling operations (UBD), which can be defined as a drilling method in which the wellbore pressure is less than formation pressure, has been growing due to their applications such as prevention of lost circulation, reduction of filtration lost in natura...
Rheological evaluation of polymers as drilling fluids
Kök, Mustafa Verşan (Informa UK Limited, 2003-01-01)
Polymers are recently found and still developing materials to overcome some drilling problems where conventional drilling fluids are not satisfactory enough. Simply, they are the best materials to use since they are non-toxic and do not cause serious environmental problems. In addition, polymeric drilling fluids may have properties such as better carrying capacity, less fluid loss, and thinner filtration cake depending on their composition and concentration. In this research, rheological parameters of two d...
Citation Formats
B. Gürbüz, “Experimental characterization of some water soluble polymers used in drilling and completion fluids,” M.S. - Master of Science, Middle East Technical University, 2012.