Deep Panuke Project Description - Encana

More documents

Recommendations

Info

Table 2.13Produced Water Disposal AlternativesAlternativeInjection into anannulusTechnicalSuitabilityConcept has significanttechnical risksIf corrosion problemoccurs, will shut down aproducer wellCostAdditional capital costfor injection equipment,additional piping, wellconstruction, andwellhead modificationsAdditional operationalcosts for injectionchemicalsCommercial RiskPotential risk of shutdownof production wellthat is being injected into(corrosion)Uncertainty with regardto a suitable injectionzoneTechnically andEconomically FeasibleNoConceptDeliverabilitySafetyEnvironmental ImpactDeep Panuke Volume 4 (Environmental Assessment Report) • November 2006 2-74
Injection into a Dedicated WellWater injection into a dedicated well is a proven technology on offshore oil developments and isnormally done for reservoir pressure maintenance. This concept would involve the use of all equipmentfor the overboard disposal scheme plus the addition of a dedicated flowline, a dedicated umbilical, a newinjection well, injection pumps, and filters. For this concept, the capability to discharge produced wateroverboard would be required to provide operational flexibility in times of maintenance and/oroperational issues. The concept, while technically feasible, is considerably more expensive than thesimpler overboard disposal concept. Since the overboard disposal concept provides a proven,environmentally acceptable alternative at a significantly lower cost, the dedicated injection well wasrejected based on economic considerations.Simultaneous Injection of Acid Gas and Produced WaterSimultaneous injection of produced water into the condensate/acid gas well is not commonly practicedoffshore due to risks associated with phase separation. Although the design rate of 6,400 m 3 /d [40,000bpd] is sufficient to dissolve 130 x 10 3 m 3 /d [4.5 MMscfd] of acid gas, the rate of produced water variesbetween 0 and 6,400 m 3 /d [40,000 bpd] and cannot be predicted with certainty at this time. Therefore,this option cannot be considered as a reliable solution for produced water disposal and was rejected.Injection of Produced Water into an Annular SpaceInjection into the annular space of an existing well is not widely practiced. This concept involvesinjecting the produced water into an annular space between the surface and production casing strings.The concept will require injection pumps and equipment on the topsides similar to the dedicated wellconcept as well as a special dual completion type wellhead and production tree arrangement. Thisconcept has the following technical challenges:• the annular space on any of the existing production wells will not have sufficient cross-sectionalarea to accept up to 6,400 m 3 /d [40,000 bpd]. Therefore, none of the existing wells could be reused;• well construction to accommodate this concept for either of the two new drill wells (H-99 or D-70) will be difficult and technically challenging because a special oversized surface casing willbe needed along with a custom wellhead and production tree; and• injection of the total expected quantity of produced water over the field life into a non-permeablezone, where the surface casing terminates, is questionable. There may be operational issues withthis concept.Deep Panuke Volume 4 (Environmental Assessment Report) • November 2006 2-75
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 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 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
show all

Deep Panuke Project Description - Encana

Create successful ePaper yourself

Delete template?

Save as template?