American Oil and Gas Reporter - January 2023 - 83
Tech Trends
tem backpressure. Once enough liquids
were unloaded, the gas started flowing
freely and the BDU was shut down.
The BDU performed as intended in
this application and data gathered from a
well on gas lift that had become extremely
loaded, unstable and shut in by the line
pressure was back flowing freely after only
a 40 psi drawdown of tubing pressure.
Preventing Hydrate Blockages
An operator in the Rocky Mountains
had ongoing production problems during
the winter season when low temperatures
and pressures would allow hydrates to
form and block surface flowlines. The
field's history shows continuous problems
with flowline freezing for up to eight
months of the year and production often
must be shut in from October through
June because of hydrate plugging. Pigging
was inhibited by line size and the cost
of methanol injection. Other hydrate reducing
chemicals also added significant
costs. As a result, operating costs were
excessive.
A field pressure/temperature profile
analysis determined that the actual hydrate
forming temperature and pressure were at
5 degrees Celsius and 200 psi, respectively.
The analysis further suggested that reducing
flowline pressure to 100 psi would drop
the hydrate forming temperature to -5 degrees
Celsius and result in free flow.
The investigation pointed to the necessity
of reducing the flowing pressure
in the gathering system and flowlines
from the wells to the battery. This could
be achieved either by adding conventional
separation with compressors and pumps
FIGURE 5
Portable Multiphase Blowdown Unit (Liquids-Rich Gas Wells)
or by installing a single multiphase pump
to draw down the pipeline pressure below
the hydrate formation point.
A multiphase pump was selected and
installed downstream of the free water
knockout vessel for metering purposes,
recombining the gas and liquids and
boosting the production stream to the
storage and processing. To provide the
multiphase pump with liquids for sealing
and compression, a small liquid pump
was installed downstream of the vessel.
As is normal in the production area, all
components were installed in a weatherproof
enclosure (Figure 5).
The hydrate flowline blocking was
successfully resolved by lowering flowline
pressure and production during the coldest
months of the year continued without interruption.
With the savings from eliminating
most of the methanol injection
and recusing shut-in time, the operator
estimated a payback time for this investment
of only 1.1 years
Multiphase pumping is here to stay as
a contributor to economical, rational and
environmentally friendly oil and gas production.
As a universal production tool,
there are many more potential applications
of the technology beyond the examples
referenced in this article. The industry
will see continued development where
multiphase pumping does not necessarily
replace other components, but works as
a catalyst and sometimes an enforcer to
make it possible to produce more efficiently
by supplementing and adding benefits
to existing systems to maximize the
productive use of hydrocarbon resources.
❒
SVEN
OLSON SR.
Sven Olson Sr. is a senior consultant for Leistritz Advanced Technologies Corp. in Allendale,
N.J. His 37-year career at Leistritz includes serving as chief executive officer and president. Olson
was involved in testing and introducing multiphase pumping technology to North America, and he
actively participates in applying and promoting the technology in both the onshore and offshore
sectors of the oil and gas industry. He holds a degree in process engineering and an M.B.A. from
the University of Lund in Sweden.
JANUARY 2023 83
American Oil and Gas Reporter - January 2023
Table of Contents for the Digital Edition of American Oil and Gas Reporter - January 2023
Contents
American Oil and Gas Reporter - January 2023 - Intro
American Oil and Gas Reporter - January 2023 - Cover1
American Oil and Gas Reporter - January 2023 - Cover2
American Oil and Gas Reporter - January 2023 - 3
American Oil and Gas Reporter - January 2023 - 4
American Oil and Gas Reporter - January 2023 - Contents
American Oil and Gas Reporter - January 2023 - 6
American Oil and Gas Reporter - January 2023 - 7
American Oil and Gas Reporter - January 2023 - 8
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American Oil and Gas Reporter - January 2023 - Cover3
American Oil and Gas Reporter - January 2023 - Cover4
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