amgas sour water recycling and re-use

AMGAS SOUR WATER RECYCLING AND RE-USE
PTAC HYDRAULIC FRACTURING FORUM
May 2015
Agenda
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Traditional Sour Water Treatment
AMGAS Clear Process
Water Recycling Case Study
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Traditional Methods of Sour Water Handling
 Fluid Sweetening with H2S Scavengers
 Oxidation of H2S with traditional chemistry
 Water sweetening prior to disposal or re-use
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Transportation of Fresh and Sour Water
 Transportation Costs
 Safety, Storage of Sour Water
 Sour Water Disposal Well Classification
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H2S Scavengers – Triazine
 Efficiency is dependent on fluid properties (pH), mixing, temperature
and retention time.
 They just convert H2S to a organo sulfur polymer
 Process changes require constant chemical dosing adjustments to
prevent over-treatment or under-treatment
 Overspent scavenger causes plugging, scaling and process upsets.
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Oxidizing Chemistry
 Common oxidizing agents: hydrogen peroxide and chlorine dioxide
 Not selective for H2S
 Dependent on process conditions, mixing/retention time
 Leaves oxidized H2S reaction products (sulfates) in the water
 Requires additional treatment in order to remove the sulfate prior to
re-use.
 Oxidizes any organic material or any entrained hydrocarbon, which
increases chemical consumption.
 Total Sulfur (H2S + sulfides + sulfates + elemental sulfur) loading
doesn’t change in the water
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AMGAS Clear Fluid Sweetening Process – Water Recycling during Completion
Operations.
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AMGAS Clear Technology Highlights
 Removes H2S / sulfides from sour crude oil, condensate, water and
drilling fluids.
 No chemical is introduced into the fluid.
 No chemical byproducts remain in the fluid therefore reducing
scaling and plugging that can be associated with overspent
scavenger.
 Eliminates costly chemical overtreatment due to chemical
inefficiencies.
 Ideal for high H2S concentrations, H2S variations and fluctuating
process changes.
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Initial Water Treatment Program for the 3 well Pad
 Fresh Water Volume trucked in 6000bbl for each well (50
 Sour Water Truck out for each well 6000bbl (50 truckloads)
 50 truckloads of sour water trucked out each day
 Onsite Storage for both fresh and sour water
 Disposal of sour water
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AMGAS Clear - Sour Water Recycling Project
Initial Fresh Water Volume trucked in 6000bbl
 3 well project
 H2S Concentration (5000-8000ppmv) during flowback
 Zero sour water trucked out. All the water was recycled throughout
the duration of the operation.
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Raw Sour Water and Sweet Water
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Sweet Water Treatment after the Clear Process
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Understanding the Solids and how they are formed
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AMGAS Clear - Conclusion
 The AMGAS Clear removes the H2S without adding any chemical
into the water.
 No process parameters or changes to the H2S/ naturally occurring
sulfides content in the water affect the clear process or how it is
operated.
 By removing the sulfur the bugs no longer have a food source,
therefore they will naturally die off.
 Other solids dropping out have been observed to be directly
correlated to the solubility of the H2S and naturally occurring sulfides
in the water. Once those are removed from solution the solids can
drop out of solution reducing water processing demand.
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Thank You
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Questions?
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