GARP®Presentation ALRDC Seminar May 14th, 2014

ALRDC Seminar
May 14th, 2014
Daryl Mazzanti – Garp Services, LLC
Wholly owned subsidiary of Evolution Petroleum Corp
What is GARP®?
What problem does it solve?
Why is this a problem?
Why choose rod pump and gas lift?
How does it work?
Results to date
Pros / Cons
Help from Industry
What is GARP® ?
• Gas Assisted Rod Pump
• Combination of two of the oil
industry’s most reliable, understood,
and popular forms of artificial lift
(Rod Pumps and Gas Lift)
What problem does it solve ?
• Reduces back pressure over
conventional forms of lift currently
placed above deviated sections in
horizontal wells and in vertical
wells that are too deep to pump
or have extended perforated
intervals. This practice leads to
production rate reduction, premature abandonment, and a loss
of reserves and leases
Why do operators do this?
• Operators are hesitant to place lift
equipment in deviated sections and
into perforated intervals due to
inefficiencies and high operating
costs associated with gas
interference, solids issues, and wear
and tear on tubulars
Flowing Well
Rod Pumped Well
Pumped Off Condition
Pump is gas locked
Standing Liquid
Long Perforated
Operators don't place the pump
with-in the perforations due to :
1) Potential for gas locking the pump
2) Potential to stick the pump
(high debris area)
Long Perforated Interval
Why choose rod pump and gas lift?
Rod pump
-Well known/understood
-Readily available parts
-Workovers can be less expensive than other forms of lift
-Lowers reservoir pressure better than other forms of lift
Gas Lift
-Well known/understood. Low maintenance costs (downhole)
-Not affected by deviated section, solids, or gas locking
-For short lift distances, provides a very efficient form of lift
without exerting high back pressure on the reservoir
-More effective in lifting deep reservoirs than other methods
GARP® First Generation Design
• Designed for 7” csg or larger
• Applicable to mainly older horizontal wells
• Dual wellhead w/ two adjacent tubing strings
one for gas injection and one for the rod pump
• Requires a small two stage compressor
• Gas lift raises liquids a short distance from the
deviated section to above the pump. Gas breaks
out and rises to the surface, liquids fall and are
trapped by a packer. Once they rise above the
pump, they enter the pump chamber and are
transported to the surface.
GARP®for Big Bore Wells (7” csg or larger)
GARP® Slim Hole Design
• Second Generation designed for wells with
4-1/2” casing or larger
• Applicable to nearly all vertical wells and
modern horizontal wells
• Utilizes concentric tubing arrangement with a
single wellhead
• Works with same principals as the larger bore
When should GARP® be installed?
• GARP is most effective when other forms
of artificial lift become inefficient or stop
working due to liquid loading below the
artificial lift equipment
GARP in the life of a well
Artificial Lift
-High Volume- Gas lift/ESP/Jet/PCP
-Med- Low Volume – Rod Pump /
Plunger/ Stop Cock/ Soap
GARP® - not tested yet for rate
acceleration in non-marginal wells
Results to Date
• Has only been installed on company owned marginal
• Morgan Kovar #1 – Austin Chalk Horizontal well in
Fayette County, Texas
• Selected Lands #2 – Georgetown/Buda Horizontal
well in Grimes County, Texas
• Philips #1 – Austin Chalk Horizontal well in Grimes
County, Texas
• Currently installing GARP® on a 10 well horizontal
pilot program with an operator in the Giddings Field
Morgan Kovar #1 Rate vs Time
Morgan Kovar #1 Rate vs Cum
Selected Lands #2 Rate vs Time
Selected Lands #2 Rate vs Cum
Philips #1 Rate vs Time
Philips #1 Rate vs Cum
Advantages of GARP®
• Economically recovers reserves currently being left behind
• Significantly extends the life of leases
• A very efficient gas separation design allows rod pumps to be
used in gassy wells
• The injection string in both designs can be utilized for a much
more efficient placement of chemicals (corrosion, scale, salt)
• Combines two of the most well established forms of artificial
lift capitalizing on specific strengths and minimizing
• In the Slim hole version, a standing valve prevents load water
from chemical/paraffin treatments from over-whelming low
pressured reservoirs. This same design also allows the pump
to be flushed using load water from casing injection to free
stuck pumps.
Disadvantages of GARP®
• Does not overcome inherent limitations of rod
pumps, i.e. solids production, wear and tear on
moving parts, paraffin, etc.
• More costly to install than rod pumps alone since
another tubing string is needed; however, most
of these costs are tangible. Typical costs are ~
$100-$125K (not incl pumping unit, rods, pump)
• A pressured gas source is necessary. A small
compressor can be built for ~$35,000 or it can be
rented for ~$1700/mo.
Help from Industry
Need opportunities to expand the technology
Wells outside of the Giddings Austin Chalk Area
Vertical oil or gas wells with extended
perforated intervals
Vertical oil/gas wells too deep to rod pump
Rate acceleration test in non-marginal wells
Willing to do pilot programs for no fee

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