Deep Panuke Project Description - Encana

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esult in eye irritation, respiratory system irritation, and higher concentrations can result in asphyxia.H 2 S is a by-product of decomposition of sulphur-containing organic material, and is associated withcertain natural gas deposits, including this Project. H 2 S has been safely managed in the natural gasresource sector. The relatively low levels of acid gas and the acid gas management system for thisProject will result in the removal and elimination of H 2 S from the gas stream. In the unlikely event of afailure of the injection system and the extinguishing of the flare, there may be a brief period ofcontrolled H 2 S emissions to atmosphere from this Project. In the event of the even much less likelyscenario of a blowout of the injection well, there will be a release of H 2 S to the environment. In theevent of a blowout from a production well, H 2 S will be released as a component of the raw gas.2.7.1.2 Air Emissions ModellingIn order to predict the dispersion and subsequent effect of air emissions from the Project, a simulationwas conducted using a mathematical computer model of atmospheric transport. This method providesquantitative results and enables direct comparison of the simulated project effects with regulatorycriteria. For certain sources where the quantitative releases are too difficult to predict, an assessment hasbeen made based on the relative likelihood of releases, and the potential consequences. Modellingresults and environmental effects associated with significant air emissions are presented in Appendix Fand Section 8.1.2.7.2 Noise EmissionsNoise emissions will mainly be generated offshore during pile driving, blasting, and drilling operations.Other noise generating activities will include ship and air traffic of materials and personnel to offshorefacilities. Onshore noise will be limited primarily to construction of the pipeline and other onshorefacilities. The discussion presented in the approved 2002 CSR regarding noise emissions (offshore andonshore) remains valid (refer to Section 2.7.2 of the approved 2002 CSR). An updated discussion onnoise associated with pile driving is presented in Section 2.3.6.2.7.3 Electromagnetic EmissionsThe description of electromagnetic emissions presented in the approved 2002 CSR remains valid. Referto Section 2.7.3 of the approved 2002 CSR.Deep Panuke Volume 4 (Environmental Assessment Report)• November 2006 2-52
2.7.4 Drill Waste Discharges2.7.4.1 Use of Drill MudsAll drilling fluids (mud) go through a cyclic process during the drilling of a well. Prior to drilling aspecific hole section, the required type of mud must be prepared. It is either prepared onshore andbrought to the rig, or the required base products are brought to the rig and it is prepared onboard. Oncethe mud is ready for use, the drilling may begin for that hole section. The following describes the simplecycle that all drilling fluids follow:1. The mud is pumped down the drillpipe to the bit on the bottom.2. The mud comes out the bit and picks up the cuttings that the bit has produced and carries thesecuttings back to the rig on the outside of the drillpipe.3. Once back on the drilling rig, the cuttings (solid materials) are separated from the mud using solidscontrol equipment. Linear vibrating shakers plus periodic use of centrifuges are the maincomponents of the solids control equipment used to separate solids (cuttings from the wellbore) fromthe drilling mud.4. The clean mud returns to the original tanks for any minor modifications (additional products) beforestarting the cycle again.5. The cycle continues until the hole section reaches final depth.Once the final depth of the hole section is achieved, the mud is cleaned for re-use on the next holesection or it is removed from the rig to allow for the next drilling fluid for the subsequent operation.Bulk mud releases will be minimized by re-using mud on the next hole section or well if possible. WBMwill be released overboard during bulk releases.Typically, a conventional production well would be installed as follows:1. Drill and case the conductor hole, then prepare WBM and change drilling tools.2. Drill and case the surface hole, then change the mud system and drilling tools.3. Drill and case the intermediate hole section, then change the drilling tools.4. Drill and case the main hole section re-using the mud system from the intermediate hole section.5. Circulate the well to clean out drilling solids, displace drilling fluid from the wellbore to completionfluid and install the completion tubing / equipment.6. Provide underbalance and allow the well to flow to surface removing all completion fluids untilburnable gas at surface prior to handover to production.7. Secure the well and move the rig to the next well location and repeat the process.Deep Panuke Volume 4 (Environmental Assessment Report)• November 2006 2-53
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 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

Deep Panuke Project Description - Encana

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