evaluation of unconventional natural gas development n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Evaluation of Unconventional Natural Gas Development PowerPoint Presentation
Download Presentation
Evaluation of Unconventional Natural Gas Development

Loading in 2 Seconds...

play fullscreen
1 / 27

Evaluation of Unconventional Natural Gas Development - PowerPoint PPT Presentation


  • 73 Views
  • Uploaded on

Evaluation of Unconventional Natural Gas Development. Potential Impacts to Aquatic Environments. Kathleen Patnode – PAFO . Resource Concerns. WATER QUANTITIY & QUALITY. TNC Pennsylvania Chapter 2010. WATER QUANTITY. Demand 5 to 7 million gallons per well from small streams by truck

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Evaluation of Unconventional Natural Gas Development' - rae


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
evaluation of unconventional natural gas development

Evaluation of Unconventional Natural Gas Development

Potential Impacts to

Aquatic Environments

Kathleen Patnode – PAFO

slide7

ResourceConcerns

WATER QUANTITIY & QUALITY

TNC Pennsylvania Chapter 2010

slide8

WATER QUANTITY

  • Demand
  • 5 to 7 million gallons per well
  • from small streams by truck
  • from rivers by pipeline
  • need reduced by recycling of used water
  • Water withdrawal regulations
  • varies between states
  • varies between and within river basins
slide9

WATER QUALITY

  • Chemicals added to Frac Water
  • Acids
  • Friction Reducers
  • Surfactants
  • Gelling Agent
  • Scale Inhibitor
  • pH Adjusting Agent
  • Oxygen Scavenger
  • Breaker
  • Crosslinkers
  • Iron Control
  • Corrosion Inhibitor
  • Antibacterial agent
slide10

Wastewater Issues

  • Flowback Water – hydraulic fracturing fluid that flows back to surface
  • up to ≈ 70 % flows to surface
  • most recovered in first 1 to 2 weeks
  • TDS increases up to 200,000 ppm
  • frac chemicals, trace elements & NORM
slide12

Wastewater Issues

  • Flowback Water Management Options
  • Deep Well Injection
  • Discharge to POTWs
  • Direct Reuse for Fracking
  • Treatment for Reuse
  • Reuse Pressure to:
  • reduce stream and river withdrawal
  • eliminate wastewater pass-through at POTWs
slide13

Contamination of water sources

No backflow preventers installed

Contaminated water and invasive species in vac trucks can discharge into water source (well, tank, lake, stream)

brine treatment at conventional treatment plants
Brine Treatment at Conventional Treatment Plants
  • VOCs – blown off
  • Oil & Grease, removed
  • Metals, removed
  • Does NOT treat TDS salts or NORM
  • TDS in = TDS out
slide15

Reusing Wastewater

  • Treatment for Reuse
  • 5-7 acre impoundments for mixing
  • impoundments provide reuse water to multiple wells
  • ~2000 truck loads of wastewater on rural roads
  • use of reuse lines from impoundments to local wells
  • high risk of truck spills and waste line breaks
  • spills are not being reported to NRC
slide17

Potential Contamination Pathways

  • Well Blowouts
  • Groundwater contamination
    • Inadequate well cementing
  • Surface water contamination
    • Frac flowback spills
    • Leaking or overflowing open water impoundments
    • Insufficient wastewater treatment

Water quality violations:

conductivity, osmotic pressure,

barium, strontium, chloride, aluminum

Mortality:

fish, aquatic invertebrates, amphibians

slide18

Documented Impacts to FWS Trust Resources

  • Frac Flowback Spill
  • Acorn Creek, KY in 2007
  • Threatened Blackside dace
  • Frac flowback spilled into creek
  • Lowered pH from 7.5 to 5.6
  • Increased conductivity
    • 100 to 35,000 uS/cm
  • Fish & aquatic invertebrate mortality

Source: Anthony Velasco, Environmental Contaminants Specialist, USFWS, KY

slide21

EROSION AND SEDIMENTATION

Extensive disturbance

Insufficient E&S controls

Multiple creek crossings

Drilling mud releases

slide22

Federal Interagency Team

  • Objective to address key science issues and data gaps
  • Geological framework
  • Changes in water availability (groundwater and surface water)
  • Changes in water quality (groundwater and surface water)
  • Changes in air quality (stray gas and dust)
  • Induced seismicity
  • Changes in landscape and habitat condition
  • Effects of these changes on
      • biological resources
      • human health
      • ecosystem services
slide23

Mussel Interagency Team

(FWS, USGS, EPA)

-determine no effect concentrations for ions in flowback water

-work with state to implement protective permit limits

-establish injury levels for spill NRDA

slide26

Best Management Practices – Water Quality

  • Development & use of “green” chemicals
  • Closed loop drilling & fracturing
    • No pits & reuse of frac water
  • Treatment and reuse of frac water
  • Development & use of dry-frac process
    • Liquid CO2
    • Explosives
  • Development of spill contingency plans
    • public lands / easements
    • Other areas with sensitive species