ppt solids control
TRANSCRIPT
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SOLIDS CONTROL
Mechanical separation of
solids from drilling fluids
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Solids Control
Solids control isan important
part of
maintainingdrilling fluids
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Solids Control
MinimizingDrill Solids Yields Better Mud Properties
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Solids Control
SolidsContaminationLeads to Hole Problems and
More Expensive Mud Treatments
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Solids Control
Nature of SolidsSize
Density
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Solids Control
A Micron is One Millionth of a Meter
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Solids Control
Micron Relationships Familiar Items
Item Size in Microns
Pollen 10 - 100
Milled Flour 1 - 80
Talcum Powder 5 - 50
Human Hair 30 - 200
Human Eye site 40
Finger Sensitivity 20
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Solids Control
Common particle size definitionsfor drill solids
Cutting 500 microns and largerSand 74 to 500 microns
Silt 2 to 74 microns
Colloidals 0 to 2 microns
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Solids Control
Low Specific Gravity SolidsBentonite 2.4
Sand 2.6
Lignite 1.1
Dense Lime 2.9
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Solids Control
High Specific Gravity SolidsBarite 4.2
Bargain 4.9Densimix 5.0
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Solids Control
Benefits of solids controlReduced total solids
+ Reduced dilution requirements+ Reduced average particle size
= Reduced cost
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Solids Control
High total solidsreduces the
sweep action of
the mud thusdecreasing the
bits penetration
rate
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Solids Control
Dilution ends upwith excess
volume
Solids controlends up with
lower volumes
Dilution is costeffective if the
mud is relatively
inexpensive
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Solids Control
With Dilution, Some of the Mud Ends Up in
the Reserve Pit
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Solids Control
Chemicals Have to Be Added Back Into the System
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Solids Control
Some of those Chemicals End Up in the
Reserve Pit
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Solids Control
Benefits of solids controlFaster drilling
+ Lower mud bills
+ Less pump and downholeequipment wear
+ Prevention of differentialpressure sticking
= Reduced cost
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Solids Control
Methods of mechanicalsolids separation
Vibratory screeningCentrifugal force
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Solids Control
Solids control equipmentShale shakers
Desanders and desiltersMud cleaners
Centrifuges
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Solids Control
S C
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S lid C l
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Solids Control
S lid C t l
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S lid C t l
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S lid C t l
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S lid C t l
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S lid C t l
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S lid C t l
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Solids Control
Common screen meshM. G.Mesh
MicronOpening
WireDiameter
% OpenArea
10 1910 0.0258 56.3
20 841 0.0162 46.2
40 380 0.0104 36.060 234 0.0075 30.5
80 177 0.0055 31.4100 140 0.0045 30.3
120 118 0.0037 30.5150 105 0.0026 37.9200 74 0.0021 33.6
325 44 0.0014 30.5
S lid C t l
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S lid C t l
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S lid C t l
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Solids Control
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Solids Control
ConeSize ID Capacitygpm Cut Pointmicrons
4 50 15-20
5 70-80 20-256 100-150 25-30
8 150-250 30-40
10 400-500 30-40
12 400-500 40-60
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Solids Control
Discontinue use of desanderand desilter when
Weight material has been added
Liquid phase is expensive
Solids Control
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Solids Control
Centrifuge applicationControl viscosity in weighted
muds
Dry the solids discharge in
closed pit system
Solids Control
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