American Oil and Gas Reporter - February 2018 - 67

wells and the cost of refracturing, understanding when to refrac can be as important
to overall project success as how a well is
treated. Many parameters control the timing
of a refrac, not the least of which is a
myriad of economic considerations. However, other factors include issues such as
the durability of proppant placed in the
initial completion (premium proppants tend
to be more durable than lower-grade proppants), thermal effects on the conductivity
of proppant, and proppant flowback.
For the purpose of well refracs, it is
AHMED ALZAHABI is a member
of the faculty at the University of Texas
of the Permian Basin. He previously
served as a researcher at the Energy
Industry Partnerships, working to solve
complex problems for the industry.
Alzahabi's research involves developing
techniques for exploiting the Permian
Wolfcamp formation. He has participated in six U.S. patent applications,
contributed a chapter in the book
"Fracturing Horizontal Wells" published by McGraw Hill in 2016, and
is writing a book on fracturing horizontal wells that will be published by
CRC Press in September, and a book
on pressure-volume-temperature property correlations that will be published
by Elsevier in March. He holds an
M.S. from Cairo University, and an
M.S. and Ph.D. in petroleum engineering from Texas Tech University.
MOHAMED Y. SOLIMAN is department chair and the William C. Miller
endowed chair professor of petroleum
engineering at the University of Houston.
He also is a fellow of the National
Academy of Inventors, and holds 32
U.S. patents. He is also the editor of
"Fracturing Horizontal Wells," published
by McGraw Hill. His areas of interest
include well test analysis, diagnostic
testing, fracturing and numerical simulation. A distinguished member of the
Society of Petroleum Engineers, Soliman
holds a B.S. in petroleum engineering
from Cairo University, and an M.S. and
a Ph.D. in petroleum engineering from
Stanford University.
MARSHALL WATSON is associate
professor and chair of the Bob L. Herd
Department of Petroleum Engineering
at Texas Tech University, and holds the
Roy Butler Chair. Before joining the
Texas Tech faculty in 2006, Watson
gained more than 25 years of petroleum
and geological engineering. He has a
B.S.in chemical engineering from Cornell
University, and an M.S. and Ph.D. in
petroleum engineering from Texas Tech.

important to distinguish between portions
of the reservoir that are likely to be restimulated effectively versus those portions
that have a low probability of success, as
well as any intervals of virgin reservoir.
Incorporating the fracturability index with
a fuzzy logic expert system optimizes
candidate selection by delineating wells
that meet specific selection criteria based
on geomechanical properties.
As a result of the analysis, a multivariate
approach is proposed (Figure 3) in which
optimum refrac design mainly is based
on stress-dependent permeability, the

number of frac stages, a static fracturability
index map, lateral length, the initial production rate, selective positioning, proppant
placement per stage, interactions with
initial fracturing positions, refrac timing
and a total dynamic productivity index.
This geochemical property-based approach represents a starting point for
building complex multivariate analytical
systems to optimize both initial stimulation
treatments and refracs in unconventional
plays while accounting for variables such
as stage spacing, proppant volumes and
specific cost functions.
r

MINIMUM FACILITY APPROACH
TO PAD BASED DEVELOPMENTS

Multiphase Production System (MPS) Advantages
Over Conventional Artificial Lift Methods
* Typically reduces lifting costs by 30% or more
* Eliminates tanks, trucking, permitting and emissions
* Reduced footprint and risk of oil spills
* Differential pressures up to 1500 psi and flow rates
up to 500,000 bpd equivalent

* Optional automated well testing for improved
reservoir management

Leistritz Advanced Technologies Corp.
www.leistritzcorp.com/minimal-approach * staff@leistritzcorp.com * (201) 934-8262

FEBRUARY 2018 67


http://www.leistritzcorp.com/minimal-approach

American Oil and Gas Reporter - February 2018

Table of Contents for the Digital Edition of American Oil and Gas Reporter - February 2018

Contents
American Oil and Gas Reporter - February 2018 - 1
American Oil and Gas Reporter - February 2018 - 1
American Oil and Gas Reporter - February 2018 - 2
American Oil and Gas Reporter - February 2018 - Contents
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