Oil Field Manager ~ Presentation
OFM helps engineers manage more wells effectively in less time
12 March 2016
Data Organisation in OFM



All data stored in relational database.
Since OFM 2000, OFM uses Microsoft
Access for data storage.
Links to other databases possible via
ODBC:
 Permanent download to Access.
 Live link to external database (no data
duplication).
External Database
2
OFM
Access
DB
Data Input Levels in OFM


Master Table is used to set the project key.
 Corresponds to the lowest level at which data is
available (usually either Completion or Wellbore).
Other well information may be included (well coordinates etc).
Field
Wellbore
Completion
Completion
3
Base Map
4
Base Map
5
Filtering Capabilities In OFM
6
Sample Production Plots
7
Sample Production Plots
8
Sample Production Plots
9
Basic Production Plot
Cum Gas =
2.992 ( Bcf )
Cum Oil = 604.621 ( Mbbl )
Cum Water = 115.114 ( Mbbl )
•Productivity decrease drastically
as soon as the water hit the well:
•AL?, Emulsion problems? Scale?
Fines migration?
Unocal - Basic Production Plot #1
160001177110038801S01
Flowunit = BU1 6 RD
E006
160001177110038801S01
Oil Rate (Cal. Day) ( bbl/d )
500
400
Water Rate (Cal. Day) ( bbl/d )
300
Liquid Rate (Cal. Day) ( bbl/d )
200
100
0
1976
77
78
79
80
81
82
83
84
85
86
87
88
89
90
Axis 1
Water Cut ( % ) 160001177110038801S01
75
200
Axis 2
60
160
Gas Oil Ratio ( Mcf/bbl ) 160001177110038801S01
45
120
30
80
15
40
0
0
1976
77
78
79
80
81
82
83
84
85
86
87
88
89
90
82
83
84
85
86
87
88
89
90
160001177110038801S01
Cumulative Oil Production ( Mbbl )
3000
2400
Cumulative Gas Production ( MMcf )
1800
Cumulative Water Production ( Mbbl )
1200
600
0
1976
10
77
78
79
80
81
DCA in OFM
11
Bubble Maps In OFM ~ Monthly Production
12
Sample Bubble Maps
13
Sample Bubble Maps
14
Sample Bubble Maps
15
Sample Bubble Maps
Lesson 3.4
16
Sample Bubble Maps
Sample Bubble Maps
17
Sample Bubble Maps
18
Sample Bubble Maps
19
OOIP and grid map in OFM
 OFM can calculate the original-oil/gas-in-place for reservoirs. This
technique uses the volumetric equation and grid arithmetic.
N=
20
A * h( gridmap) * f ( gridmap) * (1 - Swi)( gridmap)
Boi
OOIP and grid map in OFM
21
OOIP and grid map in OFM
*
*
=
Boi
22
Normalized Mapping – (OOIP-Np) Map
Area of low recovery
efficiency – workover
potential exist?
Area of over recovery
efficiency – Potential
additional pay presents ?
23
Basic Production Maps
Best gas well
24
Zones with very low recovery of gas
-Undrained zones?
-Potential for new wells?
-Stimulation opportunities?
Production Heterogeneity Index
•
Heterogeneity indexing is -
valuewell
HI =
-1
valueaverage of wells
 Comparing individual wells to the average of a well group
 A fast way to identify over- and underperforming wells, best
completion practices etc.
25
Desired results and interpretation
26
Re - perforation Analysis
 Due to different perforation
techniques, some wells experienced
problems
 Underbalanced perforating (through
tubing) may not have achieved full
penetration
 Cumulative liquid produced per perf
foot is a technique to evaluate
perforation productivity
 Grid map/bubble map results
27
Damage Indicator

Formation damage analysis
 Simple damage analysis
 Formation Damage Index (FDI)
FDI =
q
=
kh
0.007078 p
 re


 o Bo ln   s 
 rw

 Grid map
 Pressure transient is preferred for

28
calculating skin
Treatment = acidize well to remove
damage
Decline Curve Analyses Equations

Exponential Decline Conversions (where b = 0)
qi
q t  = Di t
e

Hyperbolic Decline Conversions (where 0 < b < 1)
qi
qt  =
1 bDit 1 b

Harmonic Decline Conversions (where b = 1)
qi
q t  =
1  Di t 
29
DCA in OFM
Potential zones with high Reserves
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Volumetric Drainage Radius Estimation
 Visual representation of the drainage area per well in the reservoir.
 Areas not being drained by wells are quickly identified visually with bubble
mapping
31
Technical Discussion

Volumetric Drainage radius (rev) calculation
 Literally, the volume occupied by the produced fluid at reservoir conditions
 Assume uniform pressure reservoir
 Volumetric method
5.615  N  B
rev =
p
oi
  h  f  (1 - S w - Sor )
 ft 
 Drainage radius for Np and EUR
 Additional variable can be displayed with drainage radius to provide insight of
reservoir performance
32
Volumetric Drainage Radius Example
Undeveloped spots
Drainage Radius at Np
33
Drainage Radius at EUR