Deep Panuke Project Description - Encana

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2.3.2 Export PipelineA proposed pipeline corridor has been selected as described in Sections 2.2.3 and 2.2.4 and shown onFigures 2.3 to 2.6.For the M&NP Option, the route will head towards the existing SOEP pipeline and then follow thepreviously approved route paralleling the existing SOEP pipeline to shore. The two lines will beapproximately 1 km apart, except where on bottom topography necessitates close proximity. In the nearshore area, approximately 7 km from land, the two lines will be approximately 100 m apart.For the SOEP Subsea Option, the route will head towards a close tie-in location.Preliminary route studies for the SOEP Subsea Option as well as the M&NP Option pipeline routeaffected by the field centre change have been completed. Detailed route studies will be conductedduring detailed design to confirm and refine preliminary routing and construction methods. Pipelineswill be hydrostatically tested during commissioning.Nearshore and offshore pipeline installation activities as presented in the approved 2002 CSR have notchanged; therefore, these activities are not addressed in this section as there is no need to re-assess.However, further to the pipelay information provided in the approved 2002 CSR, refer to Section 2.3.5which provides additional detail on methods involving sediment disposal.2.3.3 Subsea Tie-In FacilitiesFor the SOEP Subsea Option, sales product is transferred from the Deep Panuke MOPU via a 15 km,510 mm [20 inch] export pipeline to the existing SOEP 660 mm [26 inch] pipeline. The connection tothe SOEP pipeline will be by a subsea tie-in, referred to as a “hot tap”. The hot tap process involves theconnection of a tee (i.e., branch nipple) and an isolation valve onto the existing pipeline through which a“coupon” can be cut out of the existing pipeline while the pipeline is still operational. The branch nippleconnection can either be attached by welding or installing a mechanical clamp.“Welded” hot tap activities can be described as follows:• expose buried pipeline section by airlifting sediments;• remove weight and corrosion coating;• install and commission welding habitat;• inspect pipeline;• weld branch nipple onto pipeline;• install reinforcement sleeve;Deep Panuke Volume 4 (Environmental Assessment Report)• November 2006 2-16
• install branch nipple flange;• install isolation valve;• remove habitat;• install “hot tap” machine;• perform “hot tap”;• remove “hot tap” machine; and• install “hot tap” protection structure.“Mechanical” hot tap activities can be described as follows:• expose buried pipeline section by airlifting sediments;• remove weight and corrosion coating;• inspect pipeline;• install mechanical clamp;• install “hot tap” machine;• perform “hot tap”;• remove “hot tap” machine; and• install “hot tap” protection structure.The “hot tap” structure is connected via a spool piece to a Deep Panuke tie-in structure which houses theequipment that will be required at the end of the Deep Panuke export pipeline. This equipment includesa manual isolation valve, a check valve and provision for a temporary subsea pig receiver. A protectionstructure will be placed around each of the SOEP pipeline hot tap equipment and the Deep Panukepipeline tie-in equipment.Refer to Section 2.3.5 which provides additional detail on methods involving sediment disposal withrespect to the hot tap installation.2.3.4 Subsea Flowlines and UmbilicalsA total of six to nine subsea flowlines will be installed on the seafloor to tie-in the five to eight productionwells and one injection well. It is expected that the subsea production flowlines will be 200 to 250 mm [8to 10 inches] in diameter and range from 1 to approximately 10 km in length. The injection flowline isexpected to be 75 mm [3 inches] in diameter and approximately 1.7 km in length. The flowlines may be aflexible or rigid design and may be installed by reel-lay or s-lay pipelay methods. The flowlines will betrenched and buried. Flowline lengths, diameters, and installation method will be confirmed during detaileddesign.Deep Panuke Volume 4 (Environmental Assessment Report)• November 2006 2-17
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 18 and 19: A dedicated subsea umbilical will b
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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