INTERNAL MEMORANDUM
| FROM: |
SENIOR PROD. OPT. SUPV. BRASS TERMINAL |
TO: |
SWAMP AREA MANAGER |
| THRU: |
PROD. OPTS SUPT. |
DATE: |
18/7/2008 |
| SUBJECT: |
REPORT ON TK 19 DESLUDGING WITH KX-91 by Facility Solutions LTD. |
Desludging of Tk19 with KX-91 commenced on 14th July 2008 by Facility Solutions Ltd. And it lasted for 6 days.
TANK Description:
Tank size = 36.576m (Diameter) x &.315 m (Height)
Capacity=48,000 barrels
INITIAL PARAMETERS:
TK 19 initial level before treatment commencement = 5.324 meters
(Qty=35197 bbls)
Sludge Level in Tk 19=1.80 meters (Qty=11,909 bbls)
Circulation of Tank 19 before addition of KX-91 chemical, API 23.6, BS&W=50.0%, Water=32%, Emulsion =17.9%, Sediments=0.1%
Total number of KX-91 chemical drums used=60
Methodology of Treatment
The chemical was introduced to tank 19 in batches and the content circulated for some hours for proper mixing before transfer to the production tank.
1st Batch (14 July 2008)
A total of 60 drums of the KX-91 chemical were emptied into tank 19 using the tank transfer pumps, the content was circulated for 4 hours before being transferred to the production tank.
Some Results of the sample collected were as follows.
| Date |
Sampling Times |
Tank Situation |
API |
BS&W% |
Water% |
Emulsion% |
Sediment |
| 14/07/08 |
0800 hrs |
Circulation of Tank 19 before addition of chemical |
23.6 |
50.0 |
32.0 |
17.9 |
0.1 |
| 14/07/08 |
2000 hrs |
Recirculation of Tank 19 after addition of Chemical |
23.6 |
56.0 |
54.0 |
1.6 |
0.4 |
| 15/7/08 |
1800hrs |
Transfer from tank 19 to production tank 5 |
24.2 |
46.0 |
27.0 |
18.9 |
0.1 |
| 16/7/08 |
0800hrs |
Transfer from tank 19 to production tank 5 completed |
26.1 |
26.0 |
25.0 |
0.8 |
0.2 |
Note that the above results were bottom samples only.
At the end of batch-1 the API of crude oil has increased from 23.6 to 26.1 bottom sample,
which has transferred to production tank-6.
2nd BATCH (16 July 2008)
Sludge were transferred from tanks-1 and 4 to tank-19 for the second batch.
Parameters of batch 2 before chemical treatment with KX91:
Level of Tank 19 = 5.640 meters (Qty = 37,255 bbls)
Sludge level Tank 19 = 1.2 meters (Qty = 7,927 bbls)
Bottom Sample Analysis before addition of KX-91 chemical API 17.7, BS&W = 60.0%
Water = 3.0%, emulsion 56.6% and Sediments = 0.4%
60 drums of KX-91 chemical were introduce into tank-19 and circulated for 12hours
before being transferred to production tank 05.
Below are the initial and final sample results of the treated crude.
| Date |
Sampling Times |
Tank Situation |
API |
BS&W% |
Water
% |
Emulsion
% |
Sediment |
| 16/7/08 |
1230 hrs |
Tank 1
bottom
sample
before
draining to
tank 19 |
17.7 |
72.0 |
50.0 |
21.3 |
0.7 |
| 16/7/08 |
1500 hrs |
Recirculation
after addition
of chemical |
18.5 |
57.0 |
50.0 |
6.7 |
0.3 |
| 16/7/08 |
2300 hrs |
Tank 4
bottom sample before draining to Tank 19 |
18.7 |
60.0 |
50.0 |
9.6 |
0.4 |
| 17/7/08 |
1600 hrs |
Bottom/S
Tank 19
transfer |
21.4 |
50.0 |
42.0 |
7.6 |
0.4 |
| 17/7/08 |
1600 hrs |
Top sample tank-19 transfer |
34.1 |
12.2 |
10.0 |
2.0 |
0.2 |
| 17/7/08 |
1600hrs |
Composite/S Tank-19 transfer |
30.1 |
16.30 |
12.0 |
4.0 |
0.3 |
The final crude in the batch that was transferred to tank-05 had a composite sample
API of 30.1 and BS&W of 16.3% : water 12% and emulsion 4 percent.
3rd BATCH (18 July)
Sludge from tank-05 was transferred to tank-19 for the 3rd and final batch.
Parameters of Tank 19 before chemical treatment with KX-91.
Level of Tank 19 = 5.506 meters (Qty = 36331 bbls)
Sludge level tank 19= 0.90 meters ( Qty = 5944 bbls)
60 drums of the KX- 19 were also introduced into the tank-19 and circulated for about 12 hours before transfer to production tanks.
The results obtained were as below.
| Date |
Sampling Times |
Tank
Situation |
API |
BS&W
% |
Water
% |
Emulsion
% |
Sediment |
| 18/07/08 |
1000 hrs |
Tk-5 sample b/4 darined to Tk-19 |
20.8 |
50.0 |
40.0 |
9.8 |
0.2 |
| 18/07/08 |
1200 hrs |
Bottom/S during circulation |
23.5 |
40.0 |
32.0 |
7.8 |
0.2 |
| 18/07/08 |
1800 hrs |
Composite/S duirng circulation |
31.3 |
24.0 |
18.0 |
5.8 |
0.2 |
| 19/07/08 |
0800 hrs |
TK-19 Top/S transferred |
34.1 |
12.2 |
10.0 |
2.0 |
nil |
| 19/07/07 |
0800 hrs |
TK19 Bottom/s transferred |
27.3 |
28.0 |
18.0 |
10.0 |
nil |
| 19/07/08 |
0800 hrs |
TK-19 composite sample transferred |
32.3 |
12.0 |
8.0 |
4.0 |
nil |
The composite sample of this batch had an API of 32.3, BS&W of 12%: water 8% and emulsion 4% . This was transferred to Production tank-1.
CONCLUSION:
- The Bottom sample to all the treated tanks and tank-19 were taken and observed to be sludge free.
- Tank-19 bottom was sounded an confirmed to be sludge free.
- There is no presence of black water inter phase in the tanks any more.
