API Dynamic Settling

sixcageyMechanics

Feb 22, 2014 (3 years and 5 months ago)

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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





00:00
01:00
02:00
03:00
04:00
05:00
06:00
07:00
08:00
Time (hr:mn)
100
90
80
70
60
50
40
30
20
10
Consistency (Bc)
200
180
160
140
120
100
80
60
Temperature (degF)
BC
Temperature
Tail Slurry Consistency & Temperature vs Time
Motor
Shut
-
Off
Test


System 1


API Sedimentation





Pressurized Conditioning

+ 20 minutes at BHCT



0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
17.50
18.00
18.50
19.00
19.50
20.00
Sample Volume / cm
3


Density / ppg

Density of Slurry (ppg)

Maximum Difference = 7.8 %

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





00:00
00:30
01:00
01:30
02:00
02:30
03:00
03:30
Time (hr:mn)
100
90
80
70
60
50
40
30
20
10
0
Consistency (Bc)
200
180
160
140
120
100
80
60
40
20
0
Temperature (degF)
BC
Temperature
Tail Slurry Consistency & Temperature vs Time
Motor
Shut
-
Off
Test

System 2


API Sedimentation





Pressurized Conditioning


+20 minutes at BHCT



0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
18.50
18.55
18.60
18.65
18.70
18.75
Sample Volume / cm
3


Density / ppg

Density of Slurry (ppg)

Maximum Difference = 3.3 %

System 2


Modified Paddle


Slurry Density = 18.1
ppg


Top Density = 17.5
ppg

Middle Density = 17.8
ppg

Bottom Density = 19.2
ppg


Cone Height = 1 inch


25 rpm

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





135
72
Plastic Viscosity (cP)
Yield Point (lb
f
/100ft
2
)
117
26
Plastic Viscosity (cP)
Yield Point (lb
f
/100ft
2
)
28
10 sec
x
7
9
10 min
x
18
18
36
x
18
14
11.5
23
18
x
36
14
14
14
6
10
9
9.5
3
5
12
7
7
6.0
140
71
Temp °F
double
24
17
300
30
80
up
down
avg
Atmospheric Conditioned Rheology (R1,B1,F2)
double
96
200
52
51
69
70.0
51.5
180
up
down
avg
82.0
164
100
32
32
60
67
48
103
79
85
11
64
19
32.0
100
97.5
195
24.0
122
33.5
55
67
61.0
38
46
54
99
50.0
20
15.5
31
17
24
17.0
34
29
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