1. API Spacer Wettability Tests May 30th – June 10th , 2013
Mud-Spacer Compatibility Test & Goniometer Contact Angle Test
Wettability Test with Stirred Fluid Loss Apparatus
SSST Test & Goniometer Contact Angle Test on Final Mixture
SSST Test & Goniometer Contact Angle Test on Final Mixture (rerun)

2. Spacer-Mud Compatibility Test & Goniometer Contact Angle Test
Beaker Size (ml)
150
Mud:Spacer Volume Percent
Mud:Spacer Grams
Rheologies at Temperature ( 190 degF)
Visual Observations Pv Yp
Separation
Settling
Flocculation
Baseline Average
Treated Slides
600
300
200
100 60 30 20 10 6 3
yes/no
228.69
0.00 64 48 32 22 18 14 12 39 9 95 5
217.26
11.97 34 26 8 24
Yes No 75 25
171.52
59.87 42 4
43.85
77.93 50
114.35
119.75 54
41.77
74*
57.17
179.62 38 16 27 11
42.79
72.93
11.43
227.52 44
41.41
30.76
239.50 68 40
* Goniometer won’t take measurement, contact angle was estimated to be 74 degree

3. Stirred Fluid Loss Apparatus
Measure contact angle baseline on goniometer
Metal slide average contact angle = 73.02°
Glass slide average contact angle = 38.56°
Mud coated on both slide (Atmosphere Temp)
Spacer conditioned at 190° in stirred fluid loss apparatus
Glass slide became completely water wet
Metal slide had a average contact angle of 83.25°

4. SSST – First Run Spacer Added (ml) Spacer (%) Conductivity Baseline
0.0
125 60
23.1 80
28.6 20
100
33.3 55
160
44.4 90
180
47.4 95
200
50.0 96
220
52.4 97
240
54.5
260
56.5
280
58.3
300
60.0
320
61.5
340
63.0 98
360
64.3
380
65.5
400
66.7
420
67.7
101
440
68.8
103
460
69.7
104
480
70.6
110
500
71.4
520
72.2
111
540
73.0
113
560
73.7
115

5. Goniometer - Final SSST Mixture Treated
No Coating
100% Mud Coated for 10 sec
Rinse
Wipe
Avg. Base
Avg. C.Angle
Glass
41.69
78.82
40.30
62.50
43.69
63.81
45.69
36.53
Metal
78.42
86.67
80.85
85.65
83.96
90.32 -
Wiped slides show lower contact angle (water-wet) compared with rinsed ones.
Glass slides coated with mud before dipping into SSST final mixture give a lower contact angle. To reinforce this observation, same test was rerun as shown in next page.
Metal slides didn’t show similar results as glass ones. Metal slide became more oil-wet after treated with mud.

6. SSST – Rerun Spacer Added (ml) Spacer (%) Conductivity Baseline 0.0
0.0
125 20
9.1 2 40
16.7 60
23.1 4 80
28.6
100
33.3
120
37.5 95
140
41.2
104
160
44.4
105
180
47.4
108
200
50.0
110
220
52.4
111
240
54.5
116
260
56.5
119
280
58.3
300
60.0
320
61.5
340
63.0
121
360
64.3
380
65.5
124
400
66.7
420
67.7
440
68.8
460
69.7
480
70.6
530
72.6

7. Goniometer - Final SSST Mixture Treated (Rerun)
No Coating
100% Mud Coated
for 10 sec
for 10 min
Rinse
Wipe
Avg. Base
Avg. C.Angle
Glass
28.83
72.24
29.94
55.40
27.13
69.14
29.82
51.03
34.83
83.17
27.24
45.85
Metal
86.43
88.77
84.97
83.49
85.87 -
New glass slides yield to a baseline around 30°, used glass slides cleaned by IPA and DI water yield to a base line around 43°
Wiped slides show lower contact angle (water-wet) compared with rinsed ones.
Glass slides coated with mud before dipping into SSST final mixture give a slightly lower contact angle, which repeats the result in previous test. However, glass slide coated with mud for 10 minutes gave a higher contact angle (oil-wet). Time duration of treatment may have a big effect on wettability result.
Tests can be run with metal slides are limited by the quantity of metal slides available in lab.