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Frequently Asked Questions |
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Q: What is the highest
injection pressure that an RFI system can develop?
A: This is our second most asked question. The maximum injection
pressure that our RFI system can develop depends on your surface
pumping unit, rod string, prime mover, depths, injection rates
and fluids. However, our maximum system rating is 4500psi.
Therefore, if your equipment can handle it and you are disposing
below the disposal zone fracture pressure then the maximum
injection pressure that our system can handle is 4500psi.
Q: How often does a pump have to
be repaired and what does it cost?
A: Since DHI utilizes the best materials and components, our
pumps are repaired less often then conventional pumps. Most
often what needs repaired is just the pump barrel. However
the plunger, valves, DSB and valve rod must be inspected.
Over 80% of the cost will be pulling the system out of the
well, repairing or cleaning the wellbore if applicable and
reinstalling it.
Q: When an RFI system fails what
is most commonly the problem?
A: When an RFI system fails the most common problem is that
well is not a candidate for a DGWS system. For example, mechanical
wellbore problems, excessive sand, untreated paraffin, communication
between the production and disposal zone, no disposal zone
and etc. Therefore, DHI is spending more time and resources
while designing the installation to insure that the well is
a candidate.
Q: Can the RFI system fit in 4 ½"
casing?
A: Yes, our RFI system can fit in 4 ½" casing.
The maximum outer diameter of an RFI system that fits in 4
½" casing is 3.500".
Q: What are the maximum injection
rates that the RFI system can inject?
A: The RFI system utilizes conventional rod pumping technology.
Therefore, you can use the same methods to determine injection
rates for the RFI system as you do to determine production
rates for a conventional pump, pumping to the surface.
Q: Is there any special equipment
required to operate the RFI system?
A: There is no other special equipment required. The RFI system
utilizes conventional tubing, rods, packer, surface pumping
units, prime movers and etc.
Q: Does DHI offer the RFI system
in other materials to prevent corrosion?
A: Yes, DHI offers there systems in many different types of
substrate and plating materials. This is one area in which
DHI analyzes while designing the installation.
Q: How much space is required between
the production and disposal zone?
A: DHI recommends 100'. If less then 50' of space is available
then DHI must analyze casing size and gas and water rates.
However, if more space is available DHI recommends utilizing
up to 300'.
Q: Does the RFI system (DGWS) really
work?
A: DHI has proven the RFI system successful by testing several
RFI systems in the laboratory and in the field. For a copy
of a case study or test results fell free to contact DHI.
Q: Why are there not more RFI systems
operating?
A: For one the RFI system is a newly developed DGWS system
and second, DHI does not sale and no longer lease out there
DGWS systems. DHI is a production company and not a tool and
service company. DHI utilizes the RFI system as an improved
gas recovery method.
Q: Is gas locking ever a problem
with the RFI system?
A: Gas locking has the potential of being a larger problem
for the RFI systems then it does for conventional pumps that
produce water to the surface. However, DHI utilize downhole
tools and advance pumping techniques that prevent gas locking
from occurring.
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