NAOC Swamp Area
|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.
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%
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.
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.
Sludge were transferred from tanks-1 and 4 to tank-19 for the second batch.
Parameters of batch 2 before chemical treatment with KX91:
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.
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.
- 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.