2. OUTLINE
Introduction
What are well completions?
Types of well completions
What is intelligent well completion?
Reasons for Intelligent well completion
Advantages/Disadvantages of Intelligent well
completion over conventional completions
Conclusion.
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3. INTRODUCTION
Through the years different types of processes have
been used to complete and produce oil from
reservoirs after drilling.
Demand for processes which maximize the
recoverable reserves while reducing costs due to
intervention has been on the increase which has
brought about the latest well completion technique
which is INTELLIGENT WELL COMPLETION (IWC).
This presentation therefore is to help acquaint us
with this process.
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4. WHAT IS WELL COMPLETION?
This is a process of making a well ready for
production or(injection), this principally involves
preparing the bottom of the hole to the required
specifications, running in the production tubing and
its associated downhole tools, as well as perforating
and stimulating as required.
Sometimes the process of running in and cementing
the casing is also included.
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5. TYPES OF WELL COMPLETION
There are different types of well completions and these
include
Barefoot completion
Open hole completion
Cased hole completion
Dual completion
Surface completion
Intelligent completion
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6. WHAT ARE INTELLIGENT WELL COMPLETIONS?
IWC can be explained as the type of completion that
is based on the strategy of using REAL TIME well
monitoring and closed loop capability to maximize
the final recovery of reserves.
This is achieved by running gauges downhole to
study REAL TIME data per zone in order to make
pro active(preventive) rather than reactive(corrective)
decisions.
There are different instances where IWC’s
technology can be applied, and those are:
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7. APPLICATIONS OF IWC’S
The instances in which IWC’s are suitable for are thus
COMMINGLED PRODUCTION
Some fields have two or more reservoirs that could be
produced at the same time (usually at different depths)
but these reservoirs could have different petro physical
properties, fluid characteristics and/or different pressures.
Using an IWC lets the operator simultaneously produce
from these reservoirs, reducing risks related to cross flow
and differential depletion.
An IWC also accelerates production by taking advantage
of Real-time monitoring and active control.
Figure 1 shows a possible reservoir example for this
application. 7
9. APPLICATIONS OF IWC’S
INJECTION PROFILE ISSUES
Due to the subdivision by some Fluid units inside the same reservoir
with different petro physical properties, differential depletion occurs
(some flow units deplete faster than others) during the production
process or differential replacement occurs (some fluids units build up
their pressure faster than others), when injecting fluids for pressure
support.
In this case, IWC’s are the best solution for this typical problem. The
idea is to produce or inject (through active control valves) the fluids
that each flow unit requires, according to its petro physical properties
or energy levels.
Figure 2 shows an example of injection and production profile issues
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11. APPLICATIONS OF IWC’S
DUMP FLOOD STRATEGIES
Enhanced Oil Recovery (EOR) strategies are among the most complex ,
successful but expensive methods for maximizing final recovery of reserves.
Reducing costs in these projects is highly desirable.
In some fields, an aquifer or gas cap with enough energy and reserves (water
or gas) could be used for providing Fluids with enough energy for injecting
directly into some reservoirs or formations.
The idea is to install an IWC, proceed to produce a specific fluid with energy
(water or gas), and injecting that fluid in a specific volume on each reservoir
that requires it for maintaining the replacement factor in the values specified
by the exploitation strategy, before that fluid arrives at surface. Obviously,
adjustable control valves are the key factor for optimizing the replacement
factor and, consequently, the recovery factor of the field.
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12. ADVANTAGES/DISADVANTAGES OF
IWC’S(CHOKING CAPABILITY)
ADVANTAGES;
Total control of production or injection profiles.
No cross flow between different zones.
Real-time monitoring of different zones.
Control valves can be activated remotely.
Well test can be performed without intervention.
Operations associated with production or injection
optimization can be performed online (closed loop).
Does not require maintenance.
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14. CONCLUSION
It is obvious that IWC offers flexibility and reliability,
but the most important aspect of this technology is its
ability to adapt to changing well conditions, whether
these changes are part of a planned reservoir
exploitation strategy or an unplanned event.
It is important to note that an IWC is the key
component of an exploitation strategy to maximize
final recovery of reserves through maximum control,
real time monitoring and closed loop capability.
Finally, IWC can help operators make the right
decision at the right time by reducing uncertainty
levels.
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