Flow Assurance for 8” trunkline from GGS III(Gamij) to GGS I(Gamij

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Flow Assurance for 8” trunkline from
GGS III(Gamij) to GGS I(Gamij) to
GGS (Ramol)
A Case Study
Area IV: Gamij Field
Has presently 4 GGS viz, Limbodara GGS I and II, and Gamij GGS I and III.
Gamij GGS has two fields
• Gamij
• Halisa.
Wells drilled
• 107: Gamij
• 15 :Halisa
Crude oil characteristics of the Gamij field are very poor in general.
The main cause of many well where crude oil does not flow to the surface has been due to
poor flow characteristics.
The Challenge
• Due to oil being received via both flow lines
and(termed ‘inside’) and via tankers (termed
‘outside’) there is wild variation in input crude
oil conditions due to uncertainty in ‘outside’
crude oil quality
• Presence of very high water cuts at the input
end due to regular hot water flushing jobs
carried out at the wells due to which
conventional flow improver technology fails
GAMIJ TO RAMOL CRUDE OIL JOURNEY
Viscosity(cPs)/Pour PointX20
Effect of Flow Assurance Chemical on
Rheological Parameters( Dynamic
Viscosity and Pour Point)
995
975
955
935
915
895
875
855
835
815
795
775
755
735
715
695
675
655
635
615
595
575
555
535
515
495
475
455
435
415
395
375
355
335
315
295
275
255
235
215
195
175
155
135
115
95
75
55
35
15
Pour Point X 20
Dynamic
Viscosity(cPs)
65% Viscosity
Reduction for a
successful test
1
21 41
61 81
101 121
141 161
181 201
221 241
261 281
301 321
341 361
TEST NO.
381
401
421
441
461
481
501
04/03/2011
Flow Assurance
commenced
28/02/2011
24/02/2011
20/02/2011
16/02/2011
12/02/2011
08/02/2011
04/02/2011
31/01/2011
27/01/2011
23/01/2011
19/01/2011
15/01/2011
11/01/2011
07/01/2011
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
03/01/2011
30/12/2010
26/12/2010
22/12/2010
18/12/2010
Pressure(kg/cm2)
Effect of Flow Assurance Chemicals on Line
Pressure during peak winter conditions
Daily
Average
Pressure
Linear
(Daily
Average
Pressure)
Increasing trend in daily production of
Oil received and Ramol GGS
Daily Production Data
420
400
380
340
320
Liquid production(m3/day)
300
280
260
240
220
200
180
160
Net oil production(m3/day)
140
120
40628
40621
40614
40607
40600
40593
40586
40579
40572
40565
40558
40551
100
40544
Production(m3/day)
360
Benefits observed
Average Viscosity reduction over 88% at 29.10C
Pour Point of 24-270C obtained
Parameters within desired range for entire contract period
Sharp decline in line pressure from instantaneous high of 78kg/cm2 to an average of 16 kg/cm2 during peak
winter condition.
Increased liquid carrying capacity due to improvement in flow properties
Decrease in Steam requirements
Sharp decline water cut due to improved water separation ability and smoother flow( from 30% to 20% on a monthly average
basis)
Certificate of successful Flow
Assurance
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