# COVENANT 327 PETROLEUM ENGINEERING LABORATORY EXPERIMENT ON RHEOLOGY

COVENANT UNIVERSITY, CANNANLAND OTA,
OGUN STATE, NIGERIA.
PET
327
PETROLEUM ENGINEERING LABORATORY
EXPERIMENT ON RHEOLOGY OF A MEASURE
OF DRILLING FLUID
BY
FAYOMI OLUWASEUN OLUWASEYI
15CN03252

ABSTRACT

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We
carry out this experiment to determine the rheology of measure of drilling
fluid.

Which
is done to calculate the plastic viscosity, yield point, and the apparent
viscosity?

ABSTRACT. .
CHAPTER 1. 1
INTRODUCTION.. 3
CHAPTER 2. 4
APPARATUS. 4
METHODOLOGY. .
CHAPTER 3. 4
PROCEDURE. 5
CHAPTER 4. 5
RESULTS. 6
ANALYSIS. .
CHAPTER 5. 7
PRECAUTIONS. 7
CONCLUSION.. 7
REFERENCES. 8
Works Cited. 9

CHAPTER 1

INTRODUCTION

Viscosity can be define
as the abilityof resistance of a fluid to flow. This resistance of the flow
brings about increase in the viscosity of a given fluid.

The main instruments
used during this experiment

1.   The marsh funnel viscometer:

This is used to determine the viscosity of a given
fluid. The results gotten from this experiment is influenced by density and
also by the rate of gelation, the hydrostatic head of the mud is not constant.
Due to this variations the value of the viscosities measured does correspond
with those measured using the Rotary viscometer.

2.   Rotary Viscometer

This determines the flow characteristics of fluids
in terms of shear stress over ranges of temperature and pressure.

The gel
strength of the mud is shearing stress required to produce a slip-wise
movement.

CHAPTER 2

APPARATUS
AND METHODOLOGY

i.
The
Marsh Funnel and Measuring Cap: This is where the drilling mud is poured until it reaches reference
point. It has an opening which the mud can pass through and also Use to measure
the viscosity of drilling muds.

ii.
Electric
mixer: This is used to get homogenous mixture of drilling
mud

iii.
Beaker:
The bentonite is being placed here and taken to the weighing balance to be
weighed

iv.
Spatula:
it was used in stiring the solution of mud and also for putting the bentonite
into the beaker used for measuring.

v.
Measuring
cylinder: used to measure the amount of water required to
dissolve bentonite (usually between 350ml and 400 ml)

vi.
Weighing
balance: used to get the mass of bentonite during the
experiment

vii.
Rotary
Viscometer.
Used to measure the viscosity of mud and also the maximum dial deflection.

viii.
Stopwatch; used during the experiment to
estimate the amount of time required for drilling mud to come out of the funnel
outlet.

CHAPTER 3

PROCEDURE (Marsh
funnel) WATER BASED MUD

–
I measured 25g of Bentonite and added it
to 350ml of water.

–
I put into the mixer to get homogeneous
mixture

–
I then poured the mixture into the
screen on the top of Marsh Funnel allowing my funnel to stand upright with my
finger on the outlet of the funnel.

–
As soon as I removed my hand i ensured
my stopwatch starts reading the time until all the sample in the funnel runs
out.

–
Record the viscosity of the marsh funnel
in seconds API.

PROCEDURE (OIL BASED MUD)

–
I Repeat procedure 1-2 and 5ML of Oil

–
I Put the mixture into the cup and
adjust the platform until the rotor sleeve aligns.

–
I Tighten the platform to disallow any
form of movement.

–
I Stir the mixture by rotating the speed
selector knob, allow to mix for few seconds.

–
I Set the knob to 600 rpm. Allow the

–
I Take readings at 600 rpm.

–
I Set the knob to 300 rpm. Allow the

–
I Take readings at 300 rpm.

–
I allow the selector knob to rotate to
stir settings.

–
I Stir sample again for few seconds.

–
I Rotate the knob to gel strength and
put the viscometer off

–
I made the sleeves stop rotating, allow
10 seconds before switching the viscometer on looking at the dial.

–
I Measure the maximum dial deflection
before 10-seconds gel strength.

–
I Stir the fluid sample again and wait
for 10 seconds.

–
I Record the maximum dial deflection for
10 minutes gel strength

CHAPTER 4

RESULTS

SAMPLE 1

Shear-rate(rpm)

Viscosity(cp)

600

51

300

45

60

43

30

40

SAMPLE 1 GEL
STRENGTH

TIME

10sec

52

10min

65

SAMPLE 2

SHEAR RATE(RPM)

VISCOSITY(CP)

600

60

300

54

60

43

30

47

SAMPLE 2 GEL
STRENGTH

TIME

10sec

56

10min

71

ANALYSIS

SAMPLE 1

Plastic

51-45=6cp

Yield point

45-6=39

Apparent

=51/2=25.5

GEL STRENGTH, 10
seconds(lb/100ft2)=52

GEL STRENGTH, 10
minutes(lb/100ft2)=65

SAMPLE 2

Plastic

60-54=6

Yield point

54-6=48

60/2=30

GEL STRENGTH 10
SECONDS(LB/100FT2)=56

GEL STRENGTH 10
MINUTES (LB/100FT2)=71

CHAPTER 5

PRECAUTIONS

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

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

–
I ensured that my stopwatch started the
reading as soon as my finger left the outlet.

–
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 to avoid any form of movement.

CHAPTER 6

CONCLUSION

The rheology of water
based mud was determined using the marsh funnel and for the Oil based mud the
Rotary viscometer was used. In this experiment we determine both the pv av yp
which have being staed in this experiment with calculations.

Viscosity
is a common part in drilling mud which deals with the resistance to flow.

The
funnel viscosity is measured in Sec (API)

NOTE:
the higher the viscosity of a fluid, the higher the resistance to motion.

The
viscosity oif the drilling fluid determines the hole cleaning of the fluid

REFERENCES

Works Cited
No reference cited.