American Oil and Gas Reporter - January 2015 - 163

Production Technology
method can be used to assign different indexes to each part of the reservoir based
on their relative reservoir quality (RRQ).
Figures 2A and 2B show the distribution results of fuzzy pattern recognition
analysis for six months and three years of
cumulative oil production, respectively.

The darker colors represent areas with
higher cumulative production (excellent
RRQ) during the specified time interval.
It should be noted that RRQ is a good indicator of anticipated cumulative production (during a time interval) for a newly drilled well in a specific area of the

TABLE 1
Inputs for Top-Down Model Development
Static data
(reservoir properties)

Static data
(well design parameters)

Dynamic data

Pay thickness
Porosity
Water saturation
Porosity (offset well)
Neutron porosity (log)
Formation top

Well location
Well drainage area
TVD
Perforation thickness
Volume of total injected fluid
Weight of injected proppant
Distance to offset well
Well drainage area (offset)

Time
Days of production
q-oil (t-1)
q-oil (t-2)
Date of stimulation

FIGURE 3
KPI Analysis Results for Relative Influence of
Different Inputs on Monthly Oil Production

Rank

Feature

% Degree of Influence

1
2
3
4
5
6
7
8
9

Stimulation Date
q(t-1)-Oil
q(t-2)-Oil
Perf Thickness
Weight of Inj Proppant
Porosity (%)(1P)
X/Longitude
Porh(1-sw)(1P)
Porh(1-sw)-Ave.(1P)
Water Saturation (%)
Elevation
Vol of Total Inj Fluid
Porh(1-sw)-Ave.
Time
Resistivity
Porosity (%)
Porosity (%)-Ave.
Top (ft)
Distance (1P)
Days of Production (t)
Top (ft)(1P)
Y/Latitude

46
42
42
40
40
38
37
37
37
36
33
33
32

Time-Based Reservoir Model
The most important aspect of data
driven analysis for the oil production of
this asset was developing a time-based
reservoir model. This model used pattern
recognition techniques (artificial intelligence) and honored reservoir engineering
practices to regenerate production histories and predict the future performance of
existing and new wells. In order to make
an artificial intelligence-based reservoir
FIGURE 4A
TDM Production History
Estimates/Predicted Production
(Entire Field)

100
83
79
60
55
49
48
46
46

10
11
12
13
14
15
16
17
18
19
20
21
22

reservoir.
In addition, it is possible to determine
a production indicator (PI) for each well
and compare it with the RRQ of the area
in which the well is located. If the PI is less
than the average RRQ, the well can be considered as underperforming, making it a
good candidate for restimulation. The
right-hand panel in Figure 2C shows the
locations of underperforming wells, based
on three years of cumulative production
(the wells are denoted by the blue circles).

FIGURE 4B
TDM Production History
Estimates/Predicted Production
(Well 0512321700)

JANUARY 2015 163



American Oil and Gas Reporter - January 2015

Table of Contents for the Digital Edition of American Oil and Gas Reporter - January 2015

Contents
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