Pet 315 notes. Mud Laboratory Manual, Department of Petroleum Engineering,Covenant University.REFERENCE The most important function of a drilling mud is to suspend andremove cuttings from the bit and take them to the surface. This process dependsmainly on the rheological properties of the mud.CONCLUSION The experiment was done in order to determine the rheologicalproperties of bentonite mixed with water only (sample 1) and bentonite mixedwith barite and water only (sample 2). The readings were recorded afterconducting the experiment and the plastic viscosity, yield point, and apparentviscosity of both samples were gotten after much calculations were done.
DISCUSSION For sample 2: 52 ÷ 2= 26cpFor sample 1: 40 ÷ 2= 20cpAPPARENT VISCOSITY For sample 2: 50 – 2= 48lb/100ft2For sample 1: 33 – 7= 26lb/100ft2YIELD POINT Forsample 2: 52 – 50= 2cpFor sample 1: 40– 33= 7cpPLASTIC VICOSITY 10minutes- 42lb/100ft210seconds= 43lb/100ft2GEL STRENGTH FOR SAMPLE 2 10minutes- 24lb/100ft210seconds- 15lb/100ft2GEL STRENGTH FOR SAMPLE 1 600 RPM 300 RPM 60 RPM 30 RPM SAMPLE 1 40 33 23 20 SAMPLE 2 52 50 49 51 RESULTS b. I ensured that the line on the rotorsleeve was in contact with the sample.a. I avoided error due to parallax whiletaking RPM readings.
During theexperiment I took the following precautions:PRECAUTION 3. Iremoved the splash guard and wiped down the bob shaft and cleaned all partswith soap and water dry2. Iremoved the bob.1. Afterthe test, I removed the sleeve from the rotor.MAINTENANCE 12. For sample 2, I repeated the same procedure above.11.
I re-stirred the mud and waited for 10minutes beforerecording the maximum dial deflection for the 10minute gel strength.10. I waited for 10 seconds after the sleeve stopped rotatingand turned the power on while looking at the dial. Then I recorded the maximumdial deflection before the gel breaks at the 10-second gel strength.9. Irotated the speed selector knob to the gel setting and turned the power switchoff.
8. Ireturned the speed selector knob back to the stir setting and re-stirred thesample for a few seconds. 7. Irotated the speed selector knob to the 300 RPM setting, waited for the dial toreach a steady reading and recorded the 300 RPM setting. 6. Irotated the speed selector knob to the stir setting and mixed the sample for afew seconds. I rotated the knob to the 600 RPM setting and waited for the dialto reach a steady reading and recorded the 600 RPM reading5. Iturned the power switch behind the panel on.
4. Ipoured the mixture into a sample cup on the platform and elevated the platformuntil the line on the rotor sleeve was in contact with the sample. Then I tightenedthe nut on the platform.3.
Iused the electric mixer to mix the sample until I had smooth mixture.2. Iadded 70g of bentonite into the mixing cup along with my already measuredwater.1. Forsample 1, I measured 350ml of water in the measuring cylinder.PROCEDURES 20g of barite.700ml of water 70g of bentonite For sample 2 700ml of water70g of bentoniteFor sample 1SAMPLES USED FOR THE EXPERIMENT Fig1.
0. rotary viscometer 5. Stopwatch4. Spatula3.
Mixer2. Measuringcylinder1. RotaryviscometerEXPERIMENTAL APPARATUS The test speeds observed in this experiment are 30, 60, 300,600. While the range of gel strength test observed are for 10seconds and10minutes.
Viscosity is defined as the internal resistance to flow andgel strength, the minimum shear stress required to produce slip-wise movement.The aim of this experiment is to determine the viscosity and gel strength ofBentonite mixed with water alone (sample 1) and bentonite mixed with barite andwater alone (sample 2). The instrument used to ascertain the measure of theseproperties is the rotary viscometer.
The rotary viscometer determines the flowcharacteristics of drilling mud in terms of shear stress and shear rate overdifferent time and temperature ranges, at atmospheric pressure. INTRODUCTION Contents ABSTRACT. 2 INTRODUCTION.. 4 EXPERIMENTAL APPARATUS.
5 SAMPLES USED FOR THE EXPERIMENT. 6 PROCEDURES. 7 MAINTENANCE. 7 PRECAUTION.. 8 RESULTS. 9 DISCUSSION..
10 CONCLUSION.. 11 REFERENCE. 12 The rheological properties of a mud such as viscosity and gelstrength are very instrumental in the success of a drilling operation.
They areresponsible for the suspension and removal of drill cuttings which results inadequate hole cleaning. If these properties are not optimum, there will be anaccumulation of cuttings downhole which could lead to stuck pipe and a host ofother problems. ABSTRACT Date Submitted: 21-01-2018.Date Performed: 19-01-2018.
15CN03275NWOGBO CHINEDU BRIGHTBYA REPORT ON EXPERIMENT 1-DETERMINATION OF RHEOLOGY OF A GIVEN VOLUME OF MUD.PETROLEUM ENGINEERING LABORATORY PET327 COVENEANT UNIVERSITY, CANNANLAND OTA, OGUN STATE, NIGERIA.DEPARTMENT OF PETROLEUM ENGINEERING
