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DEPARTMENT important functions is the removal of

DEPARTMENT OF PETROLEUM
ENGINEERING

COVENANT UNIVERSITY

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PET327

PETROLEUM ENGINEERING
LABORATORY

EXPERIMENT :RHEOLOGY

GROUP G

OLUWATOTAN OLATUNJI
DANIEL

15CN03290

DATE PERFORMED :19-01-2018

DATE SUBMITTED :21-01-2018

 

 

 

 

 

 

 

 

ABSTRACT

In petroleum engineering there are many functions that
are performed by the drilling fluid  in
order to keep the wellbore stable ,on the most important functions is the
removal of cuttings frim the hole .this operation is basically achieved using
the viscous property of the mud. The rheology is a property of the circulation
fluid that have an effect on solids transport. different  parameters are tested  these includes plastic viscosity(pv),yield
point(yp),apparent viscosity (ap) and gel strength  .the information gotten from these parameters
are necessary for the control of the mud rheology . this report will determine
the relationship between shear stress and shear rate and examines the gel
strength of a sample of mud using laboratory equipments

 

 

 

 

 

 

 

 

 

                                                                       

 

 

 

 

 

 

TABLE OF CONTENT

·      
ABSTRACT

 

·       INTRODUCTION

 

·       APPARATUS

 

·       PROCEDURES

 

 

·       RESULTS AND DISCUSSION

 

 

·       PRECAUTION

 

 

·      
CONCLUSION
AND RECOMMENDATION

 

 

 

 

 

 

 

 

 

INTRODUCTION

It is important in drilling
engineering that the mud has an optimum rheology property this is to ensure
that the whole is adequately cleaned, the major property responsible for the
hole cleaning is the viscous property that will be tested for in this
experiment. The drilling mud must also be able to suspend cuttings  when drilling operations have been
temporarily stopped .there are some factors that affect the rheological
properties of the mud, these includes the plastic viscosity which depends
largely on the bulk volume of solids presents and on the viscosity of the
surrounding liquid. yield point and gel strength depend more on the  presence of colloidal clays

                      The main instrument that
would be used in this experiment is

·       
ROTARY
VISCOMETER:

                      It determines the shear
rate and shear stress of drilling fluids .the speed is easily changed with a
control knub and shear stress  values are
displayed on a lighted magnified dial for ease of recording .the gel strength
of the mud is shearing stress required to produce a slip –wise movement

 

 

 

 

 

 

 

 

 

APPARATUS

·    
ROTARY VISCOMETER

·    
WEIGHING BALANCE

·    
MEASURING CYLINDER

·    
SPATULA

·    
BEAKER

·    
ELECTRIC MIXER

·    
STOP WATCH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PROCEDURES (SAMPLE 1)

·       
Using the weighing  balance measure 35g  of bentonite and add 350ml of water measured
using measuring cylinder

·       
Mix thoroughly using the electric mixer to
achieve a homogenous mixture

·       
Place the splash guard onto the bob shaft
with short table end up towards the bearing

·       
Place the sleeves onto rotor over the bob

·       
Place the test fluid in a  simple cup and immerse the rotor sleeves
exactly to the fill on the sleeves

·       
Turn the mixture by rotating the speed
selector knob

·       
Set 
the knob to 600rpm allow the reading to stay steady then take the
reading

·       
Move the knob to stir, then Set the knob to
300rpm ,allow the reading to stay steady then take the reading

·       
Move the knob back to stir ,then set the knob
to 60 rpm, allow the reading to stay steady then take there reading

·       
Move the knob back to stir ,then set the knob
to 30rpm, allow the reading to stay steady then take the reading

·       
Move the knob back to stir ,the set the knob
to gel  setting and immediately shut off
the power

·       
As soon as the sleeves stops rotating ,wait
10 seconds ,then turn on the power and take the maximum dial reflection

·       
For the 10 minute gel strength ,re stir the
fluid and wait 10 minutes before recording the maximum dial   deflection

 

 

 

 

 

 

 

 

 

PROCEDURE (SAMPLE 2)

·       
Measured 350ml of water in the measuring
cylinder

·       
Measure 35g of bentonite using the weighing
balance

·       
Measure 10g of barite using the weighing  balance

·       
Repeat procedure 3-11 from sample 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESULTS (sample 1)

Viscosity
(in
cp)

51

45

43

40

 

shear
rate (rpm)

600

300

60

30

 

 

 

Gel strength

time

Viscosity(in
cp)

10
sec

52

10
min

65

 

 

RESULTS (SAMPLE 2)

 

 

 

Viscosity
(in
cp)

60

54

50

47

 

shear
rate (rpm)

600

300

60

30

 

 

GEL STRENGHT

time

Viscosity(in
cp)

10
sec

56

10
min

71

 

 

 

ANALYSIS (SAMPLE 1 )

1.    
PLASTIC VISCOSITY,PV=600 RPM READING -300 RPM
READING

                                        
=51 -45=6CP

2.    
YEILD POINT (LB/100FT),YP =300 RPM READING
–PV

                                                   
45-6=39

3.    
APPARENT VISCOSITY (CP),AV=600RPM READING/2

                                                   
51/2=25.5

4.    
GEL STRENGHT ,10.SECONDS(LB/100FT2)=52

5.    
GEL STRENGHT,10 MINUTES (LB/100FT2)=65

 

 

 

 

ANALYSIS(SAMPLE
2)

1. PLASTIC VISCOSITY (CP), PV =600 RPM READING -300 RPM READING    60-54 =6

2. YIELD POINT (LB/100FT2), YP=300 RPM READING –PV

                                                    
=54-6=48

3. APPARENT VISCOSITY (CP), AV =600RPM READING /2

                                                            
60/2=30

4.GEL STRENGHT ,10 SECONDS (LB/100FT2)=56

5. GEL STRENGHT ,10 MINUTES(LB/100FT2)=71

 

 

 

 

 

 

 

 

 

 

 

PRECAUTIONS

·       
I ensured that I avoided the parallax error
when taking readings on my stopwatch

·       
I ensured that I removed the sleeve from the
rotor after use

·       
I ensured that my settings were correct on
the viscometer before taking my readings

·       
I ensured that the platform of my viscometer
was well tightened to avoid any form of movement

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONCLUSION

The rheology  of a
drilling fluid  is an important aspect of
the drilling process as it determines how the wellbore flows and how it
suspends cuttings, the viscosity, which deals with the resistance to flow,  in this report has been determined by the
experiment as well as the gel strength ,other properties that were determined
in this experiment is the yield point, apparent viscosity, plastic viscosity  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

                                                                                                                                                                                 

REFERENCES

Drilling fluid technology by
engr dr.e.e. okoro

Drilling mud manual by engr
seteyeobot ifeanyi

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