Deep Panuke Project Description - Encana

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2.9.5 Subsea Protection StructuresThe production and acid gas injection well trees and the hot tap (SOEP Subsea Option) will be protectedby dedicated protection structures. These shall be separately deployed structures and designed towithstand impacts from conventional mobile fishing gear. They will also serve as dropped objectsprotection and shall be designed to allow adequate access to the wells for all planned diver and ROVintervention tasks. The wells and hot tap locations will be charted.2.9.6 Project Safety ZonesRefer to Section 2.4.4 for information.2.10 Project Alternatives2.10.1 Alternatives to the ProjectThe Alternatives to the Project as presented in the approved 2002 CSR have not changed. Accordingly,alternatives to the Project are not addressed in this section as there is no need to re-assess.2.10.2 Alternatives Means of Carrying Out the ProjectSince the approval of the CSR in 2002, EnCana has investigated options and alternatives that are moreeconomically feasible based on resource estimates which are lower than those predicted in 2002. TheProject, as conceived at present, shares many similarities with the original Project concept; however,some aspects have changed.This section describes the Project design basis as originally conceived in 2002 and discusses thealternatives that were studied leading to the final concept selection.The 2002 Project basis was designed to produce a sour gas reservoir via an offshore processing conceptand transport sales quality gas to market via a 610 mm [24 inch] 176 km pipeline with an onshore tie-into the M&NP pipeline near Goldboro, NS. The producing reservoir was located in a relatively smallareal plot enabling production to be sourced from a cluster of directionally-drilled wells from a centralwellhead platform. Offshore processing was to be performed on a second bridge-linked productionplatform. The production platform contained the main process-related utility systems. The mainelements that formed the process were as follows:· H 2 S removal;· condensate recovery and processing as the primary source for fuel on the platform;· gas dehydration;Deep Panuke Volume 4 (Environmental Assessment Report)· November 2006 2-60
· gas dewpointing;· produced water treatment and disposal; and· extraction and disposal of acid gas and surplus condensate.The process plant also required inlet and export compression to maximize resource recovery and totransport sales gas through the offshore pipeline to market. The production platform was bridge-linkedto a third platform which housed the central control room, non-hazardous utilities, and accommodationsfor offshore workers.The 2002 Project basis was designed to process 400 MMscfd at peak capacity with design allowances toallow peak production year round. This overall concept required significant infrastructure with a totaltopsides weight of approximately 13,000 tonnes to accommodate all the required facilities offshore. Thetopsides were to be built as three separate integrated decks and installed offshore by means of a semisubmersiblecrane vessel.Key similarities in the design basis between the current Project basis and the Project basis for theapproved 2002 CSR are as follows:· fluid composition and properties;· offshore gas processing;· acid gas injection into a subsea reservoir;· produced water treatment and ocean disposal; and· condensate handling, (for the M&NP Option only).Compared to the Project basis for the approved 2002 CSR, the current Project design basis has:· a larger reservoir area requiring subsea completions with tie-backs;· reduced resource estimate;· reduced peak production capacity;· increased volume of produced water; and· a MOPU replacing the three fixed platforms.2.10.2.1 Alternative Assessment MethodologyThe following methodology was used to assess Project alternatives:· review the alternatives and supporting work for the 2002 DPA and determine which fundamentalprinciples and decisions are still valid for the revised resource forecast and current concepts;Deep Panuke Volume 4 (Environmental Assessment Report)· November 2006 2-61
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 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 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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