Image from Fann instrument company.
Pet 315 notes.
Mud Laboratory Manual, Department of Petroleum
Engineering, Covenant University.
The drilling mud must have the right density so that
it can maintain hydrostatic pressure during drilling operations. It should be
monitored in order to make sure that it does not drop while drilling, because a
drop in the density of the mud will affect the overall weight exerted by the
mud column which could lead to undesired results if left unchecked.
Density for sample 1
b. I ensured that the system
was balanced before taking my reading.
a. I avoided error due to
parallax while taking readings from the scale on the mud balance.
During the experiment I ensured the
9. For sample 2, I repeated
the same procedure above.
8. I emptied the content of
the carrying cup into a bowl and washed it clean.
7. I checked the position of
the sliding rider on the beam and recorded the readings on the scale range.
6. I adjusted the sliding
weight rider on the mud balance by moving it back and forth until the bubble
was between the two lines which indicated that the system was balanced.
5. I cleaned off the spilled
mud from the carrying cup and placed the balance on the knife edge.
4. I poured the mixture into
the carrying cup on the 4 -scale mud balance until it was filled to the brim
and then covered it with the lid.
3. I used the electric mixer to
mix the sample until I had smooth mixture.
2. I added 35g 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.
10g of barite.
350ml of water
35g of bentonite
For sample 2
350ml of water
35g of bentonite
For sample 1
FOR THE EXPERIMENT
Fig1. A 4-scale metal mud balance
2. Measuring cylinder
1. 4-scale metal mud balance
340 – 1190 psi/1000ft
49 – 179 lbs/ft3
0.79 – 2.72 specific gravity (sg)
6.5 – 23.0 lbs/gal (ppg)
The 4-scale metal mud balance has the following scale
The objective of this experiment is to determine the
density of a sample of drilling fluid. For this experiment, the 4-scale metal
mud balance is used to determine the density of bentonite mixed with water
alone and bentonite mixed with barite and water. The balance has a fixed volume
cup at one end of the beam which is balanced by a fixed counterweight at the
opposite end, with a sliding weight rider which freely moves along the
graduated scale. It also has a level bubble mounted on the beam which indicates
when the system is in balance.
SAMPLE USED FOR THE EXPERIMENT —————————————————6
EXPERIMENTAL APPARATUS —————————————————————5
Density is a very important property of a drilling
mud. It is one of the major properties of the mud that helps in maintaining
hydrostatic pressure. If pressure is to be controlled, density is the first
property to be adjusted because the pressure exerted by a mud column depends on
it. And it is generally defined as weight per unit volume.
Date Submitted: 21-01-2018.
Date Performed: 19-01-2018.
NWOGBO CHINEDU BRIGHT
A REPORT ON EXPERIMENT 1-DETERMINATION OF DENSITY OF A GIVEN
VOLUME OF MUD.
PETROLEUM ENGINEERING LABORATORY
COVENEANT UNIVERSITY, CANNANLAND OTA, OGUN STATE, NIGERIA.
DEPARTMENT OF PETROLEUM ENGINEERING