Deep Panuke Project Description - Encana

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• consider concept alternatives for reduced peak production capacity(5.7 x 10 6 m 3 /d and 8.5 x 10 6 m 3 /d [200 MMscfd and 300 MMscfd]);• consider a subsea tie-in to the SOEP pipeline as a product export option;• consider platform and processing facilities which could be leased to reduce capital expenditures;and• reassess safety/occupational health and environmental criteria in light of revised concepts.The decision to proceed with the development basis described herein was based on evaluation of thefollowing criteria:• technical suitability (including operational factors, flexibility and ease of decommissioning);• capital and operating costs, taking into consideration leased arrangements of some infrastructure;• commercial risk;• concept deliverability;• safety; and• environmental considerations.If an alternative was deemed to be technically and economically unfeasible, further assessment of thatalternative using other criteria was not considered.As a precursor to the formal evaluation of various development alternatives against selected evaluationcriteria, it is also worth noting that development alternatives which will not allow EnCana to takeadvantage of the infrastructure installed by M&NP were not evaluated due to economic reasons.Examples of development options which fell outside the Project’s central development concept (andhence were determined not to be economically feasible) are alternatives involving landfall sites otherthan Goldboro, and the use of technologies requiring substantial new infrastructure such as liquefiednatural gas (LNG) or compressed natural gas (CNG) technologies. The following developmentalternatives were evaluated:• substructure type;• topsides type;• total number of platforms;• re-use of existing platform• processing location;• acid gas handling;• produced water disposal;• condensate handling;• production capacity alternatives;• field centre structure type;Deep Panuke Volume 4 (Environmental Assessment Report)• November 2006 2-62
• export pipeline alternatives;• subsea tie-back alternatives; and• acid gas injection location.For the 2002 Project basis, consideration was given to using, in addition to WBM, oil-based muds, dueto the drilling conditions associated with directionally drilled wells. However, based on the experiencegained while drilling the Deep Panuke delineation wells, it was determined that only WBM will be usedfor any new development drilling activities. Therefore, the disposal options for oil-based mud drillingcuttings described in the approved 2002 CSR are no longer applicable to the Deep Panuke Project.2.10.2.2 Substructure TypeThe environmental conditions at the field centre location are considered harsh, by offshore standards,but are well within the criteria which fit many world-wide accepted design solutions for substructures.Several types of substructures were investigated and were classed into three groups; 1) floatingstructures; 2) permanent bottom founded structures; and 3) mobile structures. Each option wasevaluated against the evaluation criteria summarized in Table 2.10 and these are discussed in thefollowing sections.Floating StructuresThe floating type structure evaluated was the semi-submersible type which requires a fixed mooringsystem with fluids being conveyed on and off the structure through a series of subsea flexible risers.This type of structure is not well suited for the relatively shallow water depth at the field centre locationand has not been proven for use in harsh, shallow water applications. It would be technically challengingto provide a mooring and riser design that would meet the project environmental conditions. Also, therehave been some unfavourable experiences in other projects using a semi-submersible as a gas productionplatform. Therefore, this concept was eliminated for technical reasons.Bottom-Founded StructuresTwo types of permanent bottom-founded structures were investigated: gravity-based and jacketstructures. The gravity-based concept was deemed to be technically acceptable; however, it was rejecteddue to higher commercial risk imposed by limited suppliers in the world market.Deep Panuke Volume 4 (Environmental Assessment Report)• November 2006 2-63
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 60 and 61: 2.9.5 Subsea Protection StructuresT
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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