Deep Panuke Project Description - Encana

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A dedicated subsea umbilical will be required for each well in order to control, monitor, and supplychemicals to the wells. All umbilicals will be trenched and buried.Offshore pipeline installation activities as presented in the approved 2002 CSR are applicable to the subseaflowline as well as umbilical installation and therefore are not addressed in this section as there is no need tore-assess. It should be noted that, while pipeline installation by reel-lay for flexible lines was notspecifically addressed in the approved 2002 CSR, there is no change in the assessment as both reel-lay ands-lay pipelay methods simply refer to the methods used to feed the pipeline from the vessel to the seabed.Further to the pipelay information provided in the approved 2002 CSR, refer to Section 2.3.5 whichprovides additional detail on methods involving sediment disposal with respect to subsea flowlines andumbilicals installation.2.3.5 Construction Methods Involving Sediment DisplacementThe Deep Panuke project has three infrastructure components that will require some form of sedimentdisturbance during the construction/installation phase. These components are as follows:• export pipeline (either M&NP Option or the SOEP Subsea Option);• flowlines; and• umbilicals.The activities, location, techniques, duration and amount of sediment disturbance are described in Table2.2 below. A summary for each component is described in the following paragraphs.2.3.5.1 Export PipelineFor the M&NP Option, the first kilometre from shore will be pre-trenched and covered with nativematerial. Alternatively, this may be replaced by a horizontal directional drill (HDD) section where thecuttings will be disposed of onshore. Approximately 50% of the remaining 173 km offshore section willbe trenched approximately 1 m into the seabed with natural or mechanical replacement of nativesediments.For the SOEP Subsea Option, the SOEP pipeline tie-in location will have to be exposed by airlifttechniques. The 15 km Deep Panuke export pipeline will be trenched approximately 1 m into the seabedwith natural or mechanical replacement of native sediments.Deep Panuke Volume 4 (Environmental Assessment Report)• November 2006 2-18
2.3.5.2 FlowlinesFlowlines for the five to eight production (18-31 km in total length) and one acid gas injection (1.7 km)will be trenched approximately 1 m into the seabed with natural or mechanical replacement of nativesediments.2.3.5.3 UmbilicalsUmbilicals for the five to eight production (18-31 km in total length), one acid gas injection (1.7 km)and gas buy-back valve, which forms part of the subsea isolation valve (SSIV) assembly (150 m), willbe trenched approximately 1 m into the seabed with natural or mechanical replacement of nativesediments.2.3.6 Subsea Equipment and Associated Protection StructuresThe following subsea equipment will be protected by dedicated protection structures:• wellhead (up to 9 in total);• hot tap (SOEP Subsea Option only, see Section 2.3.3);• tie-in (SOEP Subsea Option only, see Section 2.3.3); and• SSIV skid (protection structure may not be required since SSIV is located in MOPU SafetyZone).These shall be separately deployed structures. The protection structures shall be designed to allowadequate access to the wells for all planned diver and remotely operated vehicle (ROV) interventiontasks. The SSIV assembly shall be designed to support the piping and valves and to provide protectionagainst dropped objects. All subsea protection structures will be trawlable, cage-like, open tubularconstruction. The protection structures footprint is expected to be approximately 10 m x 10 m for thewellheads, 10 m x 6 m for the hot tap, 20 m x 15 m for the tie-in, and 5 m x 5 m for the SSIV skid.Deep Panuke Volume 4 (Environmental Assessment Report)• November 2006 2-19
Page 1 and 2: 2 PROJECT DESCRIPTIONThis section p
Page 3 and 4: Potential Radioactive Components: T
Page 5 and 6: 2.2.2 Subsea Wells and FlowlinesThe
Page 10 and 11: 2.2.3.1 M&NP OptionThe proposed pip
Page 12 and 13: The onshore portion of the pipeline
Page 14 and 15: 2.3 Construction and Installation2.
Page 16 and 17: 2.3.2 Export PipelineA proposed pip
Page 20 and 21: Table 2.2 Construction MethodsCateg
Page 22 and 23: These subsea structures may be fast
Page 24 and 25: For the new production and injectio
Page 26 and 27: Figure 2.8Typical Production Well S
Page 28 and 29: 2.3.8.1 Drilling Fluid ProgramWater
Page 30 and 31: Table 2.4 Hydrostatic Fluid Dischar
Page 32 and 33: Acid GasInjectionFeed GasCompressio
Page 34 and 35: Although the M&NP Option is the onl
Page 36 and 37: Spent TEG has no measurable H 2 S a
Page 38 and 39: Table 2.7 Water CompositionComponen
Page 40 and 41: 2.4.2 Utilities2.4.2.1 Electrical P
Page 42 and 43: will be designed considering emerge
Page 44 and 45: zones over the pipeline although th
Page 46 and 47: 2.7 Emissions and DischargesEnCana
Page 48 and 49: Table 2.8 Routine Project Emissions
Page 50 and 51: 2.7.1.1 Air PollutantsThe following
Page 52 and 53: esult in eye irritation, respirator
Page 54 and 55: Typically, a re-entry and completio
Page 56 and 57: 2.7.5.3 Deck DrainageDuring constru
Page 58 and 59: 2.9.2 Pipeline Leak PreventionThe p
Page 60 and 61: 2.9.5 Subsea Protection StructuresT
Page 62 and 63: • consider concept alternatives f
Page 64 and 65: Table 2.10Centre Substructure Type
Page 66 and 67: is much more weather-dependent than
Page 68 and 69:
Table 2.11 Processing Location Alte
Page 70 and 71:
After carefully considering the con
Page 72 and 73:
Flaring acid gas consists of direct
Page 74 and 75:
Table 2.13Produced Water Disposal A
Page 76 and 77:
Therefore, injection into an annula
Page 78 and 79:
Use of a dedicated condensate pipel
Page 80 and 81:
is taken offshore on a special lay
Page 82:
Table 2.15Acid Gas Injection Locati
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Deep Panuke Project Description - Encana

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