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ClearWELL™
Scale Control
An innovative approach to controlling scale, maximizing
production ow rates and reducing your maintenance costs
Clearly superior technology
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Proprietary, one-of-a-kind technology
Scale formation in naturally hard water can reduce the
production efciency of wells and shorten the life of
equipment—downhole and on the surface. Produced
water contains dissolved mineral ions, including
calcium, barium, strontium, carbonates and sulfates.
When these ions reach a point of supersaturationbecause of a sudden drop in pressure, changes in
temperature, a commingling of incompatible waters
or a change in pH or water chemistry, the mineral
salts become less soluble and deposit out as thick
scale. The scale adheres to pipe walls, downhole
pumps, surface owlines and the internals of surface
equipment—reducing production, jamming critical
isolation or safety valves and causing well instrumentlines to plug.
The problem
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ClearWELLTM
Scale Control
ClearWELL scale-control technology—one of
Weatherford’s latest offerings in ultragreen technology
sets the pulse for peak production ow rates by
controlling scale buildup down the wellbore and
throughout surface-production equipment.
ClearWELL technology solves scale formation problems
by generating an electric eld down the wellbore and
through the surface owlines and equipment. This electric eld causes most of the scale to form as small particles
in the bulk uid owing from the well, instead of becoming
immobilized and depositing on the metal surfaces of the
well and surface equipment.
Patented ClearWELL technology is the only system
that creates a protective electric eld, induced and
transmitted throughout the entire piping network,
affecting the water droplets and ensuring full protection.
This one-of-a-kind innovation ghts scale buildup by
preventing it from depositing in the rst place.
As a result, the scale ows out of the system, without
restricting ow or operations. And because scale
deposition is so greatly minimized, it’s only natural that
your ow rates will go up, and your maintenance costs
will go down.
Better still, the easy-to-install ClearWELL unit ghts
scale with no pollution and zero intervention.
The solution
The system treats acid-insoluble hard scales
(like barium sulfate and strontium sulfate) and
acid-soluble soft scales ( like calcium carbonate)
with great success.
Top-to-bottom, 24/7 protection
ClearWELL technology treats the entire well system
24 hours a day, seven days a week. Not only does
this device protect against scale buildup on tubulars,
but it also extends the life of valuable downhole
pumps, valves and equipment by retarding fouling
that leads to premature failure.
The ClearWELL device is quickly tted at the surface
on the wellhead—an entirely noninvasive installation,
with no interruption of production.
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The benefts are clear
Weatherford’s ClearWELLTM
technology greatly minimizes systemwideproblems associated with scale, by treating the entire wellbore and
the owlines. No other technology can do this.
ClearWELL technology enhances safety by minimizing the need
for hazardous acids and hot oils, as well as the headaches of
chemical-pump maintenance, delivery logistics, winterized
injection systems and chemical-residual monitoring—all associated
with conventional scale inhibition. With the ClearWELL device,conventional scale-inhibitor chemicals are frequently eliminated.
No downtime
With ClearWELL technology, you can maintain production during
installation. The ClearWELL unit is mounted at the surface, without
interruption to operations. Onsite installation time is usually less
than two hours.
No pollution
Ultragreen ClearWELL technology extends the period between
scheduled maintenance, which minimizes cleanup and disposal
of hazardous wastes, such as normally occurring radioactive
materials (NORMs) and spent acid.
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ClearWELLTM
Scale Control
No lost production
ClearWELL technology enables you to maintain maximum
production rates and reduce production interruptions associated
with scale remediation. With the uctuating prices of crude oil
and natural gas, lost production can be the single largest costassociated with scale deposits.
Clearly, well engineered
The ClearWELL device generates a randomly pulsed electric eld
down the length of the wellbore, including the casing and downhole
tubing, as well as through the owlines and surface equipment.
With this electric eld, the scale forms as small particles, suspended
in the bulk uid owing from the well, instead of depositing on the
metal surfaces of the well and the surface equipment.
By generating a pulsing AC current, the ClearWELL unit creates
an electric eld, induced into the wellbore as well as throughout
the wellhead and owlines. This process forces the scale to form
small crystals in the bulk uid owing out of the well, instead
of forming as thick deposits on the surfaces of the downhole and
surface well equipment.
SIGNAL DELIVERY POINT
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Tried and tested—clearly, the right choice
The chart above shows real-world benchmarks from a ClearWELL installation in West Texas.
Here are some highlights:
• Eight major interventions (slickline jobs, rod pulls, etc.)
in the 12 months before installing the ClearWELL unit.
• Acid job scheduled every seven to 10 days; stopped in May,when the ClearWELL device was installed.
• ClearWELL device has kept well scale-free, without chemicals,
for more than 900 days. No scale-related well maintenance required.
Weatherford conducted independent laboratory andeld tests to prove that the ClearWELL
TM
system is
more effective against scale buildup than conventional
scale-inhibitor technology. In simulated environments
with rapid scaling of calcium carbonate and barium
sulfate, the ClearWELL system eliminated these
harmful scale deposits.
The laboratory tests were followed by two yearsof extensive commercial-scale eld tests, involving
13 different oil and gas producers in six regions around
the world. These real-world eld results were even
more impressive.
ClearWELL device in place
more than 900 days
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ClearWELLTM
Scale Control
Clearly better scale control
for your applications Anywhere there’s water and scale
Producing wells
• Onshore or offshore wells
• Free-owing or articially lifted wells
• Gas, oil or coalbed-methane wells
• Wateroods, injection wells or steam-stimulated wells
• Conventional, deviated, horizontal or multilateral wells
Surface equipment
• Flowlines, pipelines or gathering systems
• Steam-injection boilers
• Valves, meters, chokes or orice plates
• Tanks, separators, heater-treaters or hydrocyclones
• Platforms and oating production facilities
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Anywhere scaling is a problemEnvironmentally friendly, safer operations
Ultragreen ClearWELLTM
technology, rated for Class 1,
Zone 1, is not only friendlier to the environment, but
it also makes the workplace safer for personnel.
Traditional maintenance methods create hazardous
wastes. However, the ClearWELL device treats scale
in an environmentally safe manner, minimizing andsometimes eliminating the need for chemicals that
may or may not be successful. By eliminating the use
of hazardous chemicals and dangerous mechanical
procedures, ClearWELL technology clearly enhances
personal safety.
Easy installation, exceptional power
management
The ClearWELL device is quickly and easily clamped
on the surface equipment, near the wellhead, to treatthe entire wellbore and owlines. Even at optimal
functionality, the system consumes very low amounts
of power. The device has a built-in voltage regulator
that enables intake from a 24-VDC source, for 10 W
of power consumption—or from a source delivering
anywhere between 87 and 264 VAC, for 15 W of power
consumption. The system is also fully compatible with
solar-panel systems, thermal-electric generators, and a
wide range of other power sources.
Experienced Weatherford eld-service personnel
will review every potential ClearWELL installation.
All critical well equipment and operating parameters
will be forwarded to a core ClearWELL team, to help
ensure that the ClearWELL program produces the
expected results and cost savings.
Client eld operators will still need to routinely check
and ensure that the ClearWELL unit is receiving
power. Periodically, each ClearWELL installation
will be inspected by Weatherford, to verify that the
system is operating as expected.
Easier and more efcient monitoring
For wells equipped with automated pump controllers
or remote-data-monitoring systems, the ClearWELL
unit can be adapted to permit remote alarms if
ClearWELL power or protection is interrupted.
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ClearWELLTM
Scale Control
Failure rate and number of wells pumping are shown for a
three-year time period. Signicant numbers of ClearWELL
devices were installed on the producing wells the rst year.
Note the decline in failure rate during this time period.
The results are clear
After a thorough evaluation on several test wells, one major
U.S. operator installed ClearWELL units on every well where
scale was causing frequent well failures. In the rst year, the
average well-failure rate fell by 31 percent, while at the same
time, the company was drilling more wells—increasing the
number of operating wells by 59 percent.
ClearWELL systems reduce operator wellfailure rates by 31 percent in one year
A South Texas operator wanted to increase the production
on a 6,000-ft (1,829-m) gas well that was already using
a conventional rod pump for articial lift. When a new electric
submersible pump (ESP) was installed, the well scaled up
in three days. A scale squeeze was applied, and a continuous
scale-inhibitor injection was started. The well run length was
extended to only 15 days. Then, after aClearWELL
unit wasinstalled on the wellhead, the well has since continued to
operate for more than seven months, with no scale buildup
on the ESP or owlines.
ClearWELL device extends ESP
run-length intervals from 15 days
to seven months and counting
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An operator was experiencing frequent well shutdowns because
of calcium carbonate and barium sulfate scaling in a deep
13,000-ft (3,962-m), high-temperature, high-pressure (HTHP)
gas well. The operator had spent $400,000 annually to keep
the well producing, including weekly acid jobs, replacement of
corroded tubing strings and installation of expensive high-alloy
equipment. In addition, one two-month-long well workover cost
the operator $720,000 in lost production.
During the rst year after ClearWELL technology was installed,
all scale-related maintenance was eliminated. Since then, some
residual scale buildup has been removed, and the well has
continued to produce at maximum rates. No chemicals have
been needed—neither scale inhibitors nor acid jobs.
ClearWELLTM
system solves chronic scaling problem in HTHP gas well
An operator was using mist pumps to help evaporate
produced water from an evaporation pit during the summer
months. The mist pump would scale up every one to two
weeks, requiring its removal and replacement.
A short, 12-in. pipe extension was attached to the suction
of the mist pump, to enable installation of a ClearWELL unit.
After two years and two summer seasons, the mist pump has
never needed repair. The operator is now planning to install
ClearWELL units on other evaporation-pit pumps.
The patented ClearWELL unit keeps above-ground
equipment operating at peak efciency, while dramatically
reducing scale deposits. The ClearWELL unit can be easily
installed on a wide variety of oileld surface equipment—
minimizing installation costs and reducing operating
costs—without interrupting operations.
ClearWELL technology controls calcium carbonate buildup
in Utah evaporation pit
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ClearWELLTM
Scale Control
Clearly integrated for your success
Ready to optimize production ow
rates and reduce maintenance costs?
Our dedicated subject-matter experts can evaluate your current lease operations
to help determine which of your wells are the best candidates for ClearWELL
technology. For more information, visit us at weatherford.com/clearwell.
In addition to the ClearWELL physical treatment system for solving scaleproblems, Weatherford offers all the eld services, equipment, analytical services
and monitoring programs to ensure your wells operate at peak performance.
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weatherford.com © 2009–2013 Weatherford. All rights reserved. 4171.03
ClearWELLTM
Scale Control
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at weatherford.com. For more information contact an authorized Weatherford representative. Unless noted
otherwise, trademarks and service marks herein are the property of Weatherford and may be registered in the United States and/or other countries. Weatherford products named herein may be protected by one or more U.S. and/
or foreign patents. Specications are subject to change without notice. Weatherford sells its products and services in accordance with the terms and conditions set forth in the applicable contract between Weatherford and the client.
To learn more about how ClearWELLTM technology can best meet
your scale-control needs, visit weatherford.force.com/CPP , and
select “Scale Inhibition”. A Weatherford representative will contact
you to discuss your options.