DEPARTMENTOF PETROLEUM ENGINEERINGCOVENANTUNIVERSITY,CANNANLAND OTA,OGUN STATE,NIGERIA.

PET327PETROLEUMENGINEERING LABORATORYRHEOLOGYEXPERIMENT GROUPFOJOFAITH OGHENEMUZAKPEME15CN03279DATEPERFORMED: 19-01-2018DATESUBMITTED: 21-01-2018 ABSTARCTThe study ofrheology is important because it allows the drilling fluid to be specificallyanalyzed in terms of fluid flow profile, viscosity, hole-cleaning ability, andpressure loss, and equivalent circulating density- in general, wellborehydraulics. This experiment shows the ways in which the mud rheologicalproperty-the viscosity can be calculated experimentally, and from which otherimportant mud properties like gel strength, yield point and other viscositytypes are gotten. The effect of thinner on the rheological properties of thedrilling mud is also analyzed. The report investigates the relationship betweenShear stress and shear rate and examines the gel strength of a sample of themud using laboratory equipment.             TABLEOF CONTENTABSTRACT……………………………………………………………………………………2INTRODUCTION……………………………………………………………………………4EXPERIMENTALAPPARTUS…………………………………………………………..5SAMPLE USED FOR THEEXPERIMENT……………………………………………6PROCEDURES……………………………………………………………………………….

.7RESULTS AND DISCUSSIONS…………………………..…………………………….

8PRECAUTIONS……………………………………………………………………………..9CONCLUSIONS………………………………………………………………………………10REFERENCE…………………………………………………………………………………..

11           INTRODUCTIONViscosity isa measure of the resistance of a fluid which is being deformed by either shearstress or tensile stress. The resistance the flow brings aboutincrease in the viscosity of a given fluid.In everyday terms viscosity is also known as thickness.Viscosity describes a fluid’s internal resistance to flow and may be thought ofas a measure of fluid friction. Several factors affect some rheogicalparameters of the mud to carry out efficient hole cleaning.

Like plastic viscositydepends largely on the bulk volume of solids I ad o the bulk volume of solidspresets o the viscosity of the suspending liquid. Gel strength depend more othe presence of colloidal clays and contamination of organic salts. The gel strengthof the fluid is also measured. Drilling fluids have a relationship betweenshear stress and shear rate ad are generally called Non-Newtonian fluids.             EXPERIMENTALAPPARATUS1)   Rotary Viscometer2)   Weighing balance3)   Measuring cylinder4)   Spatula5)   Beaker6)   Electric mixer7)   Stop watch                        SAMPLEUSED FOR THE EXPERIMENT (PROCEDURES)SAMPLE11)   I used the weighing balance measure35g of bentonite and add 350ml of water 2)   I mixed evenly using the electric mixerto achieve a homogenous mixture.3)   I placed the sleeve onto the rotorover the bob.4)   I placed the test fluid in a simple cupand put the rotor sleeve exactly to fill on the sleeve.

5)   I stir the mixture by rotating thespeed selector knob; allow mixing for few seconds.6)   I Set the knob to 600rpm and took myreading.7)   I set the knob to 300rpm and took my reading8)   I allowed the selector knob to rotateto stir settings9)   I stir sample again for 10-20seconds.

10)          I rotated the knob to gel and put theviscometer off11)          I waited for 10 seconds beforeturning on the viscometer after the sleeves stop.12)          I measured the maximum dialdeflection before 10 seconds gel strength13)          I stir the fluid sample again for another10-20 seconds14)          I recorded the maximum dial deflectionfor 10mi gel strength SAMPLE21)    I used the weighing balance measure35g of bentonite and add 350ml of water measured using measuring cylinder.2)    I measured 10g of barite and added tothe mixture3)    I repeated the same procedures 2-14from sample 1 above.RESULTSAND DISCUSSIONSSAMPLE 1                                                             SAMPLE 2  SHEAR-RATE(rpm) VISCOSITY(cp) 600 45 300 37 60 26 30 23 SHEAR-RATE(rpm) VISCOSITY(cp) 600 56 300 54 60 52 30 35  GEL STRENGTHSAMPLE 1                                                             SAMPLE 2 TIME READING 10secs 43 10min 45   TIME READING 10secs 52 10min 65     ANALYSISSAMPLE 1        1)   PlasticviscosityCp=600RPM reading-300RPM reading                                   =45-37                                  = 82)   YieldPointlb/ft=300RPM reading-PV                             =37-8                            =293)   ApparelviscosityCp=600RPM/2                                    =45/2                                    =22.

54)   Gelstrength, 10 seconds(lb/100ft2)                              =525)    Gel strength, 10 minutes(lb/100ft2)                                                                                                =65 SAMPLE 21)   PlasticviscosityCp=600RPM reading-300RPM reading                                 =56-54                                 =22)   YieldPointlb/ft=300RPM reading-PV                             =54-2                            =523)   ApparelviscosityCp=600RPM/2                                    =56/2                                   =284)   Gelstrength, 10 seconds(lb/100ft2)                          =435)    Gel strength, 10 minutes(lb/100ft2)                           =45                                           PRECAUTIONS1)    I ensured that I avoided parallaxerror while taking my readings on my stopwatch.2)    I ensured that I removed the sleevefrom the rotor after use. 3)    I ensured that my settings werecorrect on the viscometer before taking my readings                    CONCULSIONSTheimportance of viscous properties or rheology of the drilling fluid has beproperly shown in the just concluded experiment. The procedures andcalculations have been shown.

                  REFERENCESPetroleum engineeringdrilling fluid mud manual by Engr Setyeobot IfeayiPet 315Drilling Fluid Technology note by Engr Dr E E Okoro