American Oil and Gas Reporter - August 2017 - 77

SpecialReport: Horizontal Wellbore Construction
Once the analyses have been completed
and the slopes have been calculated, the
impact of all parameters on the production
index can be determined and plotted in
the form of a tornado chart of KPIs.
Figure 4 shows the impact of different
parameters on 30-day cumulative production. Grouping these parameters and
averaging their impact shows that natural
and completion design parameters have
very similar impacts on the production
index in this particular Marcellus asset.
Furthermore, although not readily apparent
in this image, the analysis shows that
this similarity does not change with time.

Predictive Modeling
Four types of models are used for shale
wells: decline curve analysis (DCA), rate
transient analysis (RTA), numerical simulation and data-driven analytics. It is important to be cognizant of the fact that all
of these shale modeling techniques include
assumptions. Being aware of the assumptions involved in a given technique is the
most important part of developing and
working with models derived from it.
DCA models are the simplest, essentially representing a statistical curve fit
of production data. No parameters other
than production rate are used in DCA,
and this simplicity makes DCA an attractive tool. However, the assumptions made
when using DCA include boundary-dominate flow, single-phase production, homogeneous reservoir characteristics, constant bottom-hole pressure and no changes
in operational constraints throughout the
life of a well. Likewise, there are numerous
assumptions made in developing RTAbased and numerical simulation models.
Assumptions involved with developing
data-driven models in shale analytics
mainly concern the data that are used to
develop the model. They can be summarized as assuming the data are sufficient
in quality and quantity to develop a predictive model; include the necessary information for decision making; and are
representative of well construction, reservoir, completion and production.
The steps in developing a data-driven
predictive model include:
* Selecting the input parameters.
Input parameters are usually independent
of one another, and the number of wells
in the analysis dictates the number of
input parameters that can be used in the
model. It is possible, and sometimes necessary, to use dependent variables as
input to the data-driven predictive model.
However, this only should be done if the

tool being used for predictive model development has the capability to incorporate
dependencies between several parameters
in the models, and keep track of and
honor all dependencies throughout the
analyses (not a simple task).
* Randomly partitioning the data into
three segments. One segment is used to
train the model, one is used to oversee
the training process to avoid overfitting
and memorization (it is not accessible to

the data-driven model), and one is excluded
from the training and calibration processes
and used as blind validation data.
* Selecting the technology for developing the model (it must be supervised,
and should not be rule-based to minimize
bias in the system).
* Selecting the learning algorithm.
* Training.
* Validating predictions using the
blind well data.
r

The Ultimate Diverter™

™

Old fractures isolated

Old fractures isolated

New fractures through ESeal RF Liner

How can you permanently seal off older,
unproductive perforations?
Particulates or chemical diverting agents are unpredictable, unreliable, and
often unsustainable. Enventure's ESeal™ RF (Refrac) Liner is a better
answer. It reliably creates a new wellbore with permanent isolation of existing
perforations and internal pressure integrity. In practice, this results in a
faster payback on investment and extended production life of the reservoir.
Enventure's ESeal RF Liner offers a single, permanent process, maintains
pressure integrity, and provides more accurate, more predictable diversion.
It's cost-effective, reliable, and permanent. In other words, it's the
Ultimate Diverter.
To find out more, visit us at: www.EnventureGT.com/refrac

AUGUST 2017 77


http://www.EnventureGT.com/refrac

Table of Contents for the Digital Edition of American Oil and Gas Reporter - August 2017

Contents
American Oil and Gas Reporter - August 2017 - 1
American Oil and Gas Reporter - August 2017 - 2
American Oil and Gas Reporter - August 2017 - 3
American Oil and Gas Reporter - August 2017 - Contents
American Oil and Gas Reporter - August 2017 - 5
American Oil and Gas Reporter - August 2017 - 6
American Oil and Gas Reporter - August 2017 - 7
American Oil and Gas Reporter - August 2017 - 8
American Oil and Gas Reporter - August 2017 - 9
American Oil and Gas Reporter - August 2017 - 10
American Oil and Gas Reporter - August 2017 - 11
American Oil and Gas Reporter - August 2017 - 12
American Oil and Gas Reporter - August 2017 - 13
American Oil and Gas Reporter - August 2017 - 14
American Oil and Gas Reporter - August 2017 - 15
American Oil and Gas Reporter - August 2017 - 16
American Oil and Gas Reporter - August 2017 - 17
American Oil and Gas Reporter - August 2017 - 18
American Oil and Gas Reporter - August 2017 - 19
American Oil and Gas Reporter - August 2017 - 20
American Oil and Gas Reporter - August 2017 - 21
American Oil and Gas Reporter - August 2017 - 22
American Oil and Gas Reporter - August 2017 - 23
American Oil and Gas Reporter - August 2017 - 24
American Oil and Gas Reporter - August 2017 - 25
American Oil and Gas Reporter - August 2017 - 26
American Oil and Gas Reporter - August 2017 - 27
American Oil and Gas Reporter - August 2017 - 28
American Oil and Gas Reporter - August 2017 - 29
American Oil and Gas Reporter - August 2017 - 30
American Oil and Gas Reporter - August 2017 - 31
American Oil and Gas Reporter - August 2017 - 32
American Oil and Gas Reporter - August 2017 - 33
American Oil and Gas Reporter - August 2017 - 34
American Oil and Gas Reporter - August 2017 - 35
American Oil and Gas Reporter - August 2017 - 36
American Oil and Gas Reporter - August 2017 - 37
American Oil and Gas Reporter - August 2017 - 38
American Oil and Gas Reporter - August 2017 - 39
American Oil and Gas Reporter - August 2017 - 40
American Oil and Gas Reporter - August 2017 - 41
American Oil and Gas Reporter - August 2017 - 42
American Oil and Gas Reporter - August 2017 - 43
American Oil and Gas Reporter - August 2017 - 44
American Oil and Gas Reporter - August 2017 - 45
American Oil and Gas Reporter - August 2017 - 46
American Oil and Gas Reporter - August 2017 - 47
American Oil and Gas Reporter - August 2017 - 48
American Oil and Gas Reporter - August 2017 - 49
American Oil and Gas Reporter - August 2017 - 50
American Oil and Gas Reporter - August 2017 - 51
American Oil and Gas Reporter - August 2017 - 52
American Oil and Gas Reporter - August 2017 - 53
American Oil and Gas Reporter - August 2017 - 54
American Oil and Gas Reporter - August 2017 - 55
American Oil and Gas Reporter - August 2017 - 56
American Oil and Gas Reporter - August 2017 - 57
American Oil and Gas Reporter - August 2017 - 58
American Oil and Gas Reporter - August 2017 - 59
American Oil and Gas Reporter - August 2017 - 60
American Oil and Gas Reporter - August 2017 - 61
American Oil and Gas Reporter - August 2017 - 62
American Oil and Gas Reporter - August 2017 - 63
American Oil and Gas Reporter - August 2017 - 64
American Oil and Gas Reporter - August 2017 - 65
American Oil and Gas Reporter - August 2017 - 66
American Oil and Gas Reporter - August 2017 - 67
American Oil and Gas Reporter - August 2017 - 68
American Oil and Gas Reporter - August 2017 - 69
American Oil and Gas Reporter - August 2017 - 70
American Oil and Gas Reporter - August 2017 - 71
American Oil and Gas Reporter - August 2017 - 72
American Oil and Gas Reporter - August 2017 - 73
American Oil and Gas Reporter - August 2017 - 74
American Oil and Gas Reporter - August 2017 - 75
American Oil and Gas Reporter - August 2017 - 76
American Oil and Gas Reporter - August 2017 - 77
American Oil and Gas Reporter - August 2017 - 78
American Oil and Gas Reporter - August 2017 - 79
American Oil and Gas Reporter - August 2017 - 80
American Oil and Gas Reporter - August 2017 - 81
American Oil and Gas Reporter - August 2017 - 82
American Oil and Gas Reporter - August 2017 - 83
American Oil and Gas Reporter - August 2017 - 84
American Oil and Gas Reporter - August 2017 - 85
American Oil and Gas Reporter - August 2017 - 86
American Oil and Gas Reporter - August 2017 - 87
American Oil and Gas Reporter - August 2017 - 88
American Oil and Gas Reporter - August 2017 - 89
American Oil and Gas Reporter - August 2017 - 90
American Oil and Gas Reporter - August 2017 - 91
American Oil and Gas Reporter - August 2017 - 92
American Oil and Gas Reporter - August 2017 - 93
American Oil and Gas Reporter - August 2017 - 94
American Oil and Gas Reporter - August 2017 - 95
American Oil and Gas Reporter - August 2017 - 96
American Oil and Gas Reporter - August 2017 - 97
American Oil and Gas Reporter - August 2017 - 98
American Oil and Gas Reporter - August 2017 - 99
American Oil and Gas Reporter - August 2017 - 100
American Oil and Gas Reporter - August 2017 - 101
American Oil and Gas Reporter - August 2017 - 102
American Oil and Gas Reporter - August 2017 - 103
American Oil and Gas Reporter - August 2017 - 104
American Oil and Gas Reporter - August 2017 - 105
American Oil and Gas Reporter - August 2017 - 106
American Oil and Gas Reporter - August 2017 - 107
American Oil and Gas Reporter - August 2017 - 108
American Oil and Gas Reporter - August 2017 - 109
American Oil and Gas Reporter - August 2017 - 110
American Oil and Gas Reporter - August 2017 - 111
American Oil and Gas Reporter - August 2017 - 112
American Oil and Gas Reporter - August 2017 - 113
American Oil and Gas Reporter - August 2017 - 114
American Oil and Gas Reporter - August 2017 - 115
American Oil and Gas Reporter - August 2017 - 116
American Oil and Gas Reporter - August 2017 - 117
American Oil and Gas Reporter - August 2017 - 118
American Oil and Gas Reporter - August 2017 - 119
American Oil and Gas Reporter - August 2017 - 120
American Oil and Gas Reporter - August 2017 - 121
American Oil and Gas Reporter - August 2017 - 122
American Oil and Gas Reporter - August 2017 - 123
American Oil and Gas Reporter - August 2017 - 124
https://www.nxtbook.com/nxtbooks/aogr/202103
https://www.nxtbook.com/nxtbooks/aogr/202102
https://www.nxtbook.com/nxtbooks/aogr/202101
https://www.nxtbook.com/nxtbooks/aogr/202012
https://www.nxtbook.com/nxtbooks/aogr/202011
https://www.nxtbook.com/nxtbooks/aogr/202010
https://www.nxtbook.com/nxtbooks/aogr/202009
https://www.nxtbook.com/nxtbooks/aogr/202008
https://www.nxtbook.com/nxtbooks/aogr/202007
https://www.nxtbook.com/nxtbooks/aogr/202006
https://www.nxtbook.com/nxtbooks/aogr/202005
https://www.nxtbook.com/nxtbooks/aogr/202004
https://www.nxtbook.com/nxtbooks/aogr/202003
https://www.nxtbook.com/nxtbooks/aogr/202002
https://www.nxtbook.com/nxtbooks/aogr/202001
https://www.nxtbook.com/nxtbooks/aogr/201912
https://www.nxtbook.com/nxtbooks/aogr/201911
https://www.nxtbook.com/nxtbooks/aogr/201910
https://www.nxtbook.com/nxtbooks/aogr/201909
https://www.nxtbook.com/nxtbooks/aogr/201908
https://www.nxtbook.com/nxtbooks/aogr/201907
https://www.nxtbook.com/nxtbooks/aogr/201906
https://www.nxtbook.com/nxtbooks/aogr/201905
https://www.nxtbook.com/nxtbooks/aogr/201904
https://www.nxtbook.com/nxtbooks/aogr/201903
https://www.nxtbook.com/nxtbooks/aogr/201902
https://www.nxtbook.com/nxtbooks/aogr/201901
https://www.nxtbook.com/nxtbooks/aogr/201812
https://www.nxtbook.com/nxtbooks/aogr/201811
https://www.nxtbook.com/nxtbooks/aogr/201810
https://www.nxtbook.com/nxtbooks/aogr/pbios_201810
https://www.nxtbook.com/nxtbooks/aogr/201809
https://www.nxtbook.com/nxtbooks/aogr/201808
https://www.nxtbook.com/nxtbooks/aogr/201807
https://www.nxtbook.com/nxtbooks/aogr/201806
https://www.nxtbook.com/nxtbooks/aogr/201805
https://www.nxtbook.com/nxtbooks/aogr/201804
https://www.nxtbook.com/nxtbooks/aogr/201803
https://www.nxtbook.com/nxtbooks/aogr/201802
https://www.nxtbook.com/nxtbooks/aogr/201801
https://www.nxtbook.com/nxtbooks/aogr/201712
https://www.nxtbook.com/nxtbooks/aogr/201711
https://www.nxtbook.com/nxtbooks/aogr/201710
https://www.nxtbook.com/nxtbooks/aogr/201709
https://www.nxtbook.com/nxtbooks/aogr/201708
https://www.nxtbook.com/nxtbooks/aogr/201707
https://www.nxtbook.com/nxtbooks/aogr/201706
https://www.nxtbook.com/nxtbooks/aogr/201705
https://www.nxtbook.com/nxtbooks/aogr/201704
https://www.nxtbook.com/nxtbooks/aogr/201703
https://www.nxtbook.com/nxtbooks/aogr/201702
https://www.nxtbook.com/nxtbooks/aogr/201701
https://www.nxtbook.com/nxtbooks/aogr/201612
https://www.nxtbook.com/nxtbooks/aogr/201611
https://www.nxtbook.com/nxtbooks/aogr/201610
https://www.nxtbook.com/nxtbooks/aogr/pbios2016_programguide
https://www.nxtbook.com/nxtbooks/aogr/201609
https://www.nxtbook.com/nxtbooks/aogr/201608
https://www.nxtbook.com/nxtbooks/aogr/201607
https://www.nxtbook.com/nxtbooks/aogr/201606
https://www.nxtbook.com/nxtbooks/aogr/201605
https://www.nxtbook.com/nxtbooks/aogr/201604
https://www.nxtbook.com/nxtbooks/aogr/201603
https://www.nxtbook.com/nxtbooks/aogr/201602
https://www.nxtbook.com/nxtbooks/aogr/201601
https://www.nxtbook.com/nxtbooks/aogr/201512
https://www.nxtbook.com/nxtbooks/aogr/201511
https://www.nxtbook.com/nxtbooks/aogr/201510
https://www.nxtbook.com/nxtbooks/aogr/201509
https://www.nxtbook.com/nxtbooks/aogr/201508
https://www.nxtbook.com/nxtbooks/aogr/201507
https://www.nxtbook.com/nxtbooks/aogr/201506
https://www.nxtbook.com/nxtbooks/aogr/201505
https://www.nxtbook.com/nxtbooks/aogr/201504
https://www.nxtbook.com/nxtbooks/aogr/201503
https://www.nxtbook.com/nxtbooks/aogr/201502
https://www.nxtbook.com/nxtbooks/aogr/201501
https://www.nxtbook.com/nxtbooks/aogr/201412
https://www.nxtbook.com/nxtbooks/aogr/201411
https://www.nxtbook.com/nxtbooks/aogr/201410
https://www.nxtbook.com/nxtbooks/aogr/201409
https://www.nxtbook.com/nxtbooks/aogr/pbios2014_programguide
https://www.nxtbook.com/nxtbooks/aogr/201408
https://www.nxtbook.com/nxtbooks/aogr/201407
https://www.nxtbook.com/nxtbooks/aogr/201406
https://www.nxtbook.com/nxtbooks/aogr/201405
https://www.nxtbook.com/nxtbooks/aogr/201404
https://www.nxtbook.com/nxtbooks/aogr/201403
https://www.nxtbook.com/nxtbooks/aogr/201402
https://www.nxtbook.com/nxtbooks/aogr/201401
https://www.nxtbook.com/nxtbooks/aogr/201312
https://www.nxtbook.com/nxtbooks/aogr/201311
https://www.nxtbook.com/nxtbooks/aogr/201310
https://www.nxtbook.com/nxtbooks/aogr/201309
https://www.nxtbook.com/nxtbooks/aogr/201308
https://www.nxtbook.com/nxtbooks/aogr/201307
https://www.nxtbook.com/nxtbooks/aogr/201306
https://www.nxtbook.com/nxtbooks/aogr/201305
https://www.nxtbook.com/nxtbooks/aogr/201304
https://www.nxtbook.com/nxtbooks/aogr/201303
https://www.nxtbook.com/nxtbooks/aogr/201302
https://www.nxtbook.com/nxtbooks/aogr/201301
https://www.nxtbook.com/nxtbooks/aogr/201212
https://www.nxtbook.com/nxtbooks/aogr/201211
https://www.nxtbook.com/nxtbooks/aogr/201210
https://www.nxtbook.com/nxtbooks/aogr/201209
https://www.nxtbook.com/nxtbooks/aogr/2012_pbios
https://www.nxtbook.com/nxtbooks/aogr/201208
https://www.nxtbook.com/nxtbooks/aogr/201207
https://www.nxtbook.com/nxtbooks/aogr/201206
https://www.nxtbook.com/nxtbooks/aogr/201205
https://www.nxtbook.com/nxtbooks/aogr/201204
https://www.nxtbook.com/nxtbooks/aogr/201203
https://www.nxtbook.com/nxtbooks/aogr/201202
https://www.nxtbook.com/nxtbooks/aogr/201201
https://www.nxtbook.com/nxtbooks/demo/aogr_clone
https://www.nxtbook.com/nxtbooks/aogr/201112
https://www.nxtbookmedia.com