API Dynamic Settling

Report
API Dynamic Settling
June 11-15, 2012
Project Goals
Design four systems for cooperative testing.
•System 1
•Pass API Sedimentation Test
•Fail Dynamic Modified Paddle Test
•System 2
•Pass API Sedimentation Test
•Pass Dynamic Modified Paddle Test
•System 3
•Hematite System that Fails Dynamic Modified Paddle Test
•System 4
•Spacer System that Passes Dynamic Modified Paddle Test
Parameters
Standard API Test Schedule
•Depth and Temperature
•Depth 10,000 feet
•BHST = 250 °F, BHCT = 180 °F
•BHP = 6300 psi
• API Casing Schedule
•50 minutes to BHCT and BHP
Cement Materials for System 1
Cement
•LaFarge Joppa H
Sand
•100 mesh Silica Sand
Weighting Agent
•Hematite
Retarder/Fluid Loss
•Diacel LWL
Extender
•Bentonite
Slurry Test Plan
Rheology
•Atmospheric Consistometer conditioning
•Pressurized Consistometer conditioning
Free Water
•Atmospheric Consistometer conditioning - Vertical
•Pressurized Consistometer conditioning - 45°Angle
Thickening Time
•Include motor shut-off
API Sedimentation
Dynamic Modified Paddle
System Design 1
Class H + 35% Sand + 25%Hematite + 0.5% Diacel LWL
•Density 18.0 ppg
•Yield 1.43 cu ft/sack
•Mix fluid 5.07 gallons/sack
•Solid Volume Fraction 52.8%
System 1 - Rheology
System 1 - Rheology
System 1 – Free Water
Atmospheric Conditioning
20 minutes at BHCT
Trace Free Water
Slight Settling
System 1 – Free Water 45° Angle
Pressurized Conditioning
50 minute Heat-Up
+ 20 minutes at BHCT
BHP 6300 psi
4.5 mLs Free Water
Channeling to 225 mLs
Slight Settling
System 1 – Thickening Time
200
100
Tail Slurry Consistency & Temperature vs Time
120
140
Temperature (degF)
Consistency (Bc)
50
60
70
160
80
180
90
BC
Temperature
60
10
20
80
30
100
40
Motor
Shut-Off
Test
00:00
01:00
02:00
03:00
04:00
05:00
Time (hr:mn)
06:00
07:00
08:00
System 1 – API Sedimentation
Pressurized Conditioning
+ 20 minutes at BHCT
Density of Slurry (ppg)
80.00
Sample Volume / cm
3
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
17.50
Maximum Difference = 7.8 %
18.00
18.50
19.00
Density / ppg
19.50
20.00
System 1 – Modified Paddle
Slurry Density
= 18.1 ppg
Top Density
= 17.7 ppg
Middle Density = 18.1 ppg
Bottom Density = 18.8 ppg
Cone Height
= 1.5 inches
25 rpm
System Design 2
Class H + 35% Sand + 25%Hematite + 1% Bentonite +
0.5% Diacel LWL
•Density 18.0 ppg
•Yield 1.44 cu ft/sack
•Mix fluid 5.07 gallons/sack
•Solid Volume Fraction 52.9%
System 2 - Rheology
System 2 - Rheology
System 2 – Free Water 45° Angle
Pressurized Conditioning
50 minute Heat-Up
+ 20 minutes at BHCT
BHP 6300 psi
4 mLs Free Water
No Channeling
No Settling
System 2 – Thickening Time
180 200
90 100
Tail Slurry Consistency & Temperature vs Time
Consistency (Bc)
40
50
60
70
100 120 140
80
Temperature (degF)
80
160
BC
Temperature
60
40
20
0
0
10
20
30
Motor
Shut-Off
Test
00:00
00:30
01:00
01:30
02:00
Time (hr:mn)
02:30
03:00
03:30
System 2 – API Sedimentation
Pressurized Conditioning
+20 minutes at BHCT
Density of Slurry (ppg)
80.00
Sample Volume / cm
3
70.00
60.00
50.00
40.00
Maximum Difference = 3.3 %
30.00
20.00
10.00
0.00
18.50
18.55
18.60
18.65
Density / ppg
18.70
18.75
System 2 – Modified Paddle
Slurry Density
= 18.1 ppg
Top Density
= 17.5 ppg
Middle Density = 17.8 ppg
Bottom Density = 19.2 ppg
25 rpm
Cone Height
=
1 inch
System Design 3
Hematite System that Fails Dynamic Modified
Paddle Test
Class H + 42%Hematite + 0.2% Retarder +
0.2% Antifoam
•Density 19.0 ppg
•Yield 1.20 cu ft/sack
•Mix fluid 4.40 gallons/sack
•Solid Volume Fraction 50.8%
System 3 - Rheology
Atmospheric Conditioned Rheology (R1,B1,F2)
Temp °F
80
180
up
down
avg
double
up
down
avg
double
300
71
69
70.0
140
96
99
97.5
195
200
52
51
51.5
103
79
85
82.0
164
100
32
32
32.0
64
55
67
61.0
122
60
24
24
24.0
48
46
54
50.0
100
30
17
17
17.0
34
29
38
33.5
67
6
10
9
9.5
19
11
20
15.5
31
3
5
7
6.0
12
9
14
11.5
23
10 sec
x
7
7
14
x
14
14
28
10 min
x
18
18
36
x
18
18
36
Plastic Viscosity (cP)
117
Plastic Viscosity (cP)
135
Yield Point (lbf /100ft2)
26
Yield Point (lbf/100ft2 )
72
System 3 – Free Water and Settling
• 45 degree Free Fluid at 180°F
• 3.2% Free Fluid
• Dynamic Modified Paddle Settling test
•
•
•
•
1 inch of Cone Height
Top Density = 18.2 lb/gal
Middle Density = 19.2 lb/gal
Bottom Density = 19.4 lb/gal
System Design 4
Spacer System that Passes Dynamic Modified
Paddle Test
Chemplex 50 lb/bbl C63 Spacer + 276 lb/bbl Barite +
0.75 bbl Water
•Density 14.0 ppg
•Solid Volume Fraction 25.3%
System 4 – Free Water and Settling
• 45 degree Free Fluid at 180°F
• 0% Free Fluid
• Dynamic Modified Paddle Settling test
•
•
•
•
No Measurable Cone Height
Top Density = 13.3 lb/gal
Middle Density = 13.9 lb/gal
Bottom Density = 14.0 lb/gal

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