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8/15/2019 Oilfield NGL Liquid Handling
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Prism MidstreamUnderstanding How to Treat Off-Spec NGL’s Doug Coleman – Vice Presiden t
NGL Recovery Optim izat ion & Cryo p lant Faci l i t ies Design 2015
17 February - 18 February 2015 | Houston, Texas
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Founded in 2000 by a management team comprised of former
employees of Union Pacific Resources Corporation
Gathering and Processing platform in East Texas
• 320 MMscfd gas processing plant
• 14,500 Bpd of fractionation
• 700 miles of pipe• Truck NGL and Condensate loading and unloading facilities
• Rail loading and unloading access
Prism Gas Systems was sold to CNP in June 2012
Prism Gas Systems
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Founded in 2012 as Prism Midstream LLC with Energy Spectrum
Company Focus
• Texas natural gas gathering and processing
• Crude gathering and transloading
• Liquids handling
Assets• Transloading facility in Pecos, Texas
• Two stabilization facilities in the Permian Basin
• 153 mile Eaglebine area gas gathering system
Prism Midstream
3
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Understanding how to treat off spec NGL’s from
Refrigeration and JT Processing Plants
Review of typical NGL and NGL pipeline specifications
Evaluation of the causes of off spec NGLs and the associated
operational problems
Methods for treating NGL’s for color, H2S, CO2, and high methane
or high C1/C2 ratio
Liquids Handling
4
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Typical NGL specifications
Composition
• Carbon Dioxide
• Methane
• Ethane
• Aromatics• Olefins
• Vapor Pressure
Corrosiveness• Copper Strip @ 100⁰ F
• Total Sulfur• Hydrogen Sulfide
NGL Specifications
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Typical NGL specifications (continued)
Color
• Saybolt number
Dryness
• No free water or
• No free water at a specific temperature
• Hydrogen Sulfide
NGL Specifications
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Typical NGL “Pipeline” specifications
Generally include the previous specifications and tests for
• Olefins
• Distillation end point
• Halides including fluorides
• Maximum pipeline temperature• Generally include the previous specifications and tests for
A field test to check that the NGL product is “water white”
NGL Specifications
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NGL Specifications
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Lone Star NGL Pipeline
• Energy Transfer
• West Texas to Mount Belvieu
• 1170 miles of pipeline
• 137,000 Bbls/day capacity
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NGL Specifications
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Lone Star NGL Pipeline
• CO2, 500 ppm max
• Vapor Pressure, 600 psig
@100deg F
• Copper Strip @ 100 deg F, No.1• Hydrogen Sulfide, Pass on
ASTM D-2420
• Color, +25 Saybolt
• Dryness, No free water
@34degF
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NGL Specifications
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Sandhills NGL Pipeline
• CO2, 1000 ppm max
• Vapor Pressure, 600 psig
@100deg F
• Copper Strip @ 100 deg F, No.1• Hydrogen Sulfide, Pass on
ASTM D-2420
• Total Sulfur, Max 150 ppm
• Color, +27 Saybolt
• Dryness, No free water
@34degF
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Typical causes of off spec NGLs
High CO2• CO2 composition spikes in the inlet gas production
• Running the unit too cold to increase production
High C1/C2 ratio
• Running the unit too cold• Failure to plan, no NGL stabilizer installed along with the
Refrigeration or JT plant
Causes of Off Spec NGLs
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Typical causes of off spec NGLs (continued)
Off Color
• Rust from the internals of a new pipeline or “new-used”
storage
• Crude carry over from field production facilities
• Water contamination and associated “dyes”
High H2S
• Failure of upstream H2S scavenger injection facilities
• Condensate/crude carry over from field production
Causes of Off Spec NGLs
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Treatment for high C1/C2 and high vapor pressure
Running too cold; warm up the unit
• High C1 or C1/C2 ratio
• Most refrigeration and JT units are not designed operate below
-40⁰F
• Too high vapor pressure product to truck
• NGL stabilizer to drive off the CO2 and ethane if not included in
the original design
NGL stabilizer to remove CO2
Treating for High C1 / C1/C2 ratio
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Solutions for high CO2 NGLs
Warm up the unit; running too cold
• High CO2
• Too high vapor pressure to truck
• Install a NGL stabilizer to drive off the CO2 and ethane if not
included in the original design
Install NGL stabilizer to remove CO2 and ethane
Chemical scavenger
• Amine or other chemical that will “bind” the CO2• Settles out at the storage• Expensive to operate
Treating for High CO2
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Solutions for off color NGLs
Charcoal Filter
• Similar to a Charcoal filter for an amine unit
• Removes the heavier hydrocarbons and dyes that cause
NGL’s off spec for color
Condensate stabilizer or “weathering” • If the color is due to a large carry over crude would rapidly
deplete the charcoal bed
• Stabilizer separates the NGLs from the crude equivalent which
contains the color
Treatment for Off Color NGLs
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Treatment for sour NGLs
H2S scavenger
• Amine or other chemical that will “bind” the H2S
• Settles out at the storage and drained with any water
• Expensive to operate
Caustic Treater (KOH)• Typically an “experienced” vessel or vertical filter
• Cost effective but once the caustic is spent it needs to be
replenished
Amine Unit Treater• Well known process and cheaper operating costs than a
caustic treater
• Highest capital costs
Treating for High H2S
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C O N F I D E N T I A L
Prism Liquid Handling Facility
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Project
• Provide liquids handling services for
growing Permian Basin production• On spec and off spec NGLs
• Field condensate
• Improved netbacks, one stop shop
• Proven experience in the area
Scope• Trucking loading and unloading facilities
on US HWY 190 in Crockett County
• NGL injection point
• Caustic treater for treating of NGLs for
H2S and CO2
• NGL stabilizer for treatment of high C1 or
C1/C2 ratio
• 2000 BBL/day condensate stabilizer
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C O N F I D E N T I A L
Pecos Transloading Facilities
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Transloading Facility
• Manifest service
• Multiple purchasers
• Current capacity 15,000 Bpd
• Developing unit train capabilities
• Multi Commodity
• Crude Oil• Condensate
• Frac Sand
• Tubulars
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C O N F I D E N T I A L
Leon County - Bright Star System
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Bright Star
• 153 mile gas gathering system
• Serves Leon and Houston Counties
• In the heart of the Woodbine / Eagle
bine play
• Developing a crude gathering system
with a section of under utilizedpipeline
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