Water Balance is crucial for designing offshore installation.

Water balance study for offshore platform

1. (PROJECT NAME)
Water System Overview

2. Key Issues
•Long term ability of the aquifer to deliver the water requirements
−Kick off water study through external consultants
•Define quality requirements for stimulation water
−Potential for raw aquifer water to be used
•Define optimum method for water supply distribution through the
field
−WP study identified options. Waiting for further information from supply /
disposal work.
•Identification of sub-surface horizon for disposal water re-injection
−Sub-surface team conducting work to identify suitable horizon
•Development of treatment options for produced water recycle
−Reverse Osmosis will not work
−Brine Concentrators / Mechanical Vapor Recompressor Evaporators
−Working with GE Water, Veolia, Aquatech, and others

3. Raw Water Supply

4. Water Requirement Summary

5. Water Disposal
Water Disposal Requirements
0
5000
10000
15000
20000
25000
30000
35000
40000
2
0
1
3
2
0
1
4
2
0
1
5
2
0
1
6
2
0
1
7
2
0
1
8
2
0
1
9
2
0
2
0
2
0
2
1
2
0
2
2
2
0
2
3
2
0
2
4
2
0
2
5
2
0
2
6
2
0
2
7
2
0
2
8
2
0
2
9
2
0
3
0
2
0
3
1
2
0
3
2
2
0
3
3
2
0
3
4
2
0
3
5
2
0
3
6
2
0
3
7
2
0
3
8
2
0
3
9
2
0
4
0
2
0
4
1
2
0
4
2
2
0
4
3
Year
A
v
e
r
a
g
e

D
a
i
l
y

R
a
t
e
-

m
³
/
d
Waste Water - POA Waste Water - Drilling Camps Waste Water - Construction CampFrac Flow Back Water
RO Reject Water Produced Water (20bbl/mmscf) Produced Water (70bbls/mmscf)Produced Water (140 bbls/mmscf)
Assumptions:
- RO Reject based on all water supply being provided via RO
units with 40% recovery efficiency.
- Train 2 operational 24 months after Train 1.

6. Water Disposal Summary April 13, 2011
Users
Waste Water - CPF Offices and Accomodation 350 people @ 350 l/person/day 123
Waste Water - Drilling Crews 900 people @ 350 l/person/day 315
Waste Water - Construction Crews (CPF, Pipelines, Well
Sites, etc.) 3500 people @ 350 l/person/day 1225
Produced Water 140bbls / mmscfd@ 1200 mmscfd 26710
70bbls / mmscfd@ 1200 mmscfd 13355
Frac Water Flow Back 18750m³ water per well@ 2 wells per month 1233
RO Reject Water Assumes total water supplied to users is RO quality. 7762
Total 37367m
3
/d
1557m
3
/hr
Quantity (m
3
/ d)
Water Disposal Summary

7. Disposal of Water to Surface?
•For WGR of 140 bbls H
2
0 per mmscfd, evaporation pond would
be 3.0 km x 1.8 km
−70 bbls H
2
0 per mmscfd – 1.8 km x 1.5 km
•Solid salt would accumulate at a rate of ~ 4200 tonnes per day
−70 bbls H
2
0 per mmscfd - ~2200 tonnes per day
Not feasible. Brine must be re-injected.

8. Overall Water Balance
Water Balance
0
5000
10000
15000
20000
25000
30000
35000
40000
2
0
1
3
2
0
1
4
2
0
1
5
2
0
1
6
2
0
1
7
2
0
1
8
2
0
1
9
2
0
2
0
2
0
2
1
2
0
2
2
2
0
2
3
2
0
2
4
2
0
2
5
2
0
2
6
2
0
2
7
2
0
2
8
2
0
2
9
2
0
3
0
2
0
3
1
2
0
3
2
2
0
3
3
2
0
3
4
2
0
3
5
2
0
3
6
2
0
3
7
2
0
3
8
2
0
3
9
2
0
4
0
2
0
4
1
2
0
4
2
2
0
4
3
Year
A
v
e
r
a
g
e

D
a
i
l
y

R
a
t
e

(
m
³
/
d
)
Total Supply RequirementsTotal Disposal Requirements

9. Treatment and Recycle
•Produced Water too saline for Reverse Osmosis to work
•Treatment options are forced evaporation units
−GE Water
−Veolia
−Aquatech

10. Water Balance
•Potential to treat and
recycle produced water,
frac flow back, and RO
reject water for drilling,
stimulation and CPF use
•Excess water disposed of
through re-injection
Supply Side
Potable Water Process Water
- Plant Operations - CPF
- Drilling Camps -Drilling Use
- Construction Camps- Completions Use
~ 2200 m³/d ~ 3000 m³/d
Source from
aquifer, use RO
units to purify
Treatment
Disposal Side - Brine Concentrators
Domestic Waste Process
- Plant Operations - Produced Water
- Drilling Camps - Frac Flow Back Concentrated
- Construction Camps- RO Reject Brine Stream
~ 1800 m³/d ~22,000
to 35,000 m³/d
Treat and Release Re-Injection