The most important function of a drilling mud is to suspend and
remove cuttings from the bit and take them to the surface. This process depends
mainly on the rheological properties of the mud.

CONCLUSION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The experiment was done in order to determine the rheological
properties of bentonite mixed with water only (sample 1) and bentonite mixed
with barite and water only (sample 2). The readings were recorded after
conducting the experiment and the plastic viscosity, yield point, and apparent
viscosity of both samples were gotten after much calculations were done.

DISCUSSION

 

 

 

 

For sample 2: 52 ÷ 2= 26cp

For sample 1: 40 ÷ 2= 20cp

APPARENT VISCOSITY

 

For sample 2: 50 – 2= 48lb/100ft2

For sample 1: 33 – 7= 26lb/100ft2

YIELD POINT

 

For
sample 2: 52 – 50= 2cp

For sample 1: 40­­­
– 33= 7cp

PLASTIC VICOSITY

 

10minutes- 42lb/100ft2

10seconds= 43lb/100ft2

GEL STRENGTH FOR SAMPLE 2

 

10minutes- 24

10seconds- 15

GEL 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 rotor
sleeve was in contact with the sample.

a.     I avoided error due to parallax while
taking RPM readings.

             During the
experiment I ensured the following precautions:

PRECAUTION

 

  

3.    
I
removed the splash guard and wiped down the bob shaft and cleaned all parts
with soap and water dry

2.    
I
removed the bob.

1.    
After
the 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 before
recording the maximum dial deflection for the 10minute gel strength.

10. I waited for 10 seconds after the sleeve stopped rotating
and turned the power on while looking at the dial. Then I recorded the maximum
dial deflection before the gel breaks at the 10-second gel strength.

9.    
I
rotated the speed selector knob to the gel setting and turned the power switch
off.

8.    
I
returned the speed selector knob back to the stir setting and re-stirred the
sample for a few seconds.

7.    
I
rotated the speed selector knob to the 300 RPM setting, waited for the dial to
reach a steady reading and recorded the 300 RPM setting.

6.    
I
rotated the speed selector knob to the stir setting and mixed the sample for a
few seconds. I rotated the knob to the 600 RPM setting and waited for the dial
to reach a steady reading and recorded the 600 RPM reading

5.    
I
turned the power switch behind the panel on.

4.    
I
poured the mixture into a sample cup on the platform and elevated the platform
until the line on the rotor sleeve was in contact with the sample. Then I tightened
the nut on the platform.

3.    
I
used the electric mixer to mix the sample until I had smooth mixture.

2.    
I
added 70g of bentonite into the mixing cup along with my already measured
water.

1.    
For
sample 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 water

70g of bentonite

For sample 1

SAMPLES USED FOR THE EXPERIMENT

 

 

 

 

 

 

 

 

 

 

 

 

  

                     
Fig1.0. rotary viscometer

                             
 

 

5.    
Stop
watch

4.    
Spatula

3.    
Mixer

2.    
Measuring
cylinder

1.    
Rotary
viscometer

EXPERIMENTAL APPARATUS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The test speeds observed in this experiment are 30, 60, 300,
600. While the range of gel strength test observed are for 10seconds and
10minutes.

Viscosity is defined as the internal resistance to flow and
gel strength, the minimum shear stress required to produce slip-wise movement.
The aim of this experiment is to determine the viscosity and gel strength of
Bentonite mixed with water alone (sample 1) and bentonite mixed with barite and
water alone (sample 2). The instrument used to ascertain the measure of these
properties is the rotary viscometer. The rotary viscometer determines the flow
characteristics of drilling mud in terms of shear stress and shear rate over
different 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
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The rheological properties of a mud such as viscosity and gel
strength are very instrumental in the success of a drilling operation. They are
responsible for the suspension and removal of drill cuttings which results in
adequate hole cleaning. If these properties are not optimum, there will be an
accumulation of cuttings downhole which could lead to stuck pipe and a host of
other problems.  

ABSTRACT

 

 

 

 

 

                              Date Submitted: 21-01-2018.

Date Performed: 19-01-2018.

 

15CN03275

NWOGBO CHINEDU BRIGHT

BY

A 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