Cook Inlet Offshore Update

Transcription

1 Hilcorp Alaska, LLC Cook Inlet Offshore Update A Company Built on Energy Integrity Urgency Ownership Alignment Innovation

2 Anna Spill Summary Spill Estimated Volume < 3 Gallons Immediately shutdown oil shipping pumps and notified Hilcorp EH&S Flushed 495 bbl of oil from Anna to Bruce with seawater to eliminate spill potential Performed operational hydro test of pipeline at 340 PSI and had no leak Still investigating leak source

3 MGS A to Shore Pipeline Baker Platform A Leak Location LAT: (NAD83) LON: (NAD83) PLAT A-A GAS 8 inch (Fuel gas going out to platforms) Platform C Dillon MGS Onshore

4 MGS A to Shore Pipeline Pipeline Information: Pipeline was installed in Pipeline converted from oil to gas service in Residual oil exists in the line at an unknown volume. Gathered data in 2016 on pipelines after purchasing assets in late (thickness readings, spans, etc.) Leak location is on rock outcrop. Repair Considerations: Heavy ice in the inlet presents unsafe diving conditions. Record number of days for freezing fog and limited fly conditions. Pigging the pipeline is not recommended before completing pipeline repair. Pig must be pumped with incompressible fluid which could release residual oil from the pipeline. Reducing Potential Impact: Positive internal pressure keeps water out and prevents hydrocarbon from escaping to surface. Pipeline pressure reduced voluntarily to reduce leak rate.

5 MGS A to Shore Pipeline February 7th, 2017: Leak confirmed Normal operating pressure ~200psi Flowrate ~2.34 MMscfd Leak rate estimated between Mcfd February 15th, 2017: Shutdown water flood processes on platforms Reduced pipeline pressure to ~160 psi Reduced flowrate to ~1.94 MMscfd March 14th, 2017: Reduced pipeline pressure to ~150 psi Reduced flowrate to ~1.87 MMscfd March 25th, 2017: Shutdown oil/gas processes on platforms Reduced pipeline pressure to ~65 psi Reduced flowrate to ~0.55 MMscfd Reduced estimated leak rate to Mcf/day

6 Moving Forward Monitoring: Monitor pressure and differential flow rates (ins and outs of the system). Continue environmental monitoring and sampling, Pipeline Repair: Dive crews are ready to mobilize as soon as conditions permit. Temporary clamp installation (3-5 days). Permanent clamp installation (5-7 days). Moving Forward: Pipeline modifications to allow pigging (2017). Smart Pigging of oil and gas pipelines from Platform A to MGS Onshore.

7 Smart-Pig: UT Piglet In-line uni-directional corrosion detection tool. Measures metal loss, dents, and GPS location.

8 Sub-Sea Manifold

9 Environmental Monitoring Possible Species Natural Methane Seeps Methane Effects Exposure Pathways Post-Leak Water Quality Sampling Higher Sensitivity Sampling University of Alaska Fairbanks* Literature Review Dispersion Modeling Possible effects on water quality Methane bubbling physics Tidal Characteristics Buoy Equipped with Sensors Laboratory Samples Background Sampling Water Quality Sampling Assessing Environmental Impact Ice Monitoring Helicopter Overflights Platform Observations NOAA Forecasting Buoy Equipped with Sensors Laboratory Samples Background Sampling Air/Water Interface Sampling Acoustic Monitoring Fish and Wildlife Monitoring Protected Species Observers Wildlife Professionals Platform Observations Leak Sounds Background Sounds * Pending final contract approval

10 Environmental Monitoring GPS Methane Oxygen Barometric Pressure 2 Meters Below Surface Dissolved Oxygen Temperature Speed GPS 7 Meters Below Surface 12.5 Meters Below Surface Dissolved Oxygen Dissolved Methane Dissolved Carbon Dioxide Temperature Dissolved Oxygen Dissolved Methane Dissolved Carbon Dioxide Temperature Depth ph Turbidity Conductivity Dissolved Oxygen Salinity Conductivity Temperature Dissolved Oxygen Dissolved Methane *Data points collected every seconds.

11 Environmental Monitoring

12 Integrity Team GIS & Mapping Pipeline Regulatory Compliance Pipeline Integrity Management CI Pipeline Integrity Assessment & Mitigation NS Pipeline Integrity Assessment & Mitigation Structural Integrity Assessment & Mitigation Drafting & Data Management Process Safety Compliance Piping, Vessel, Tank & Topside Inspection Management of Change Corrosion & Chemical Management CI Mechanical Integrity NS Mechanical Integrity Inspection Data Management Piping, Vessel & Tank Inspection Fire & Gas Engineering Valve Maintenance & Testing Inspection Data Management