OBEN GAS DEVELOPMENT PROJECT

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Chapter Two Project Justification Civil Works There is no new road construction or rehabilitation of existing Oben Location road. The new process modules to be installed in the gas plant will make use of the existing concrete bays. Hence, no civil work is envisaged for this plant upgrade. Logistics Transportation of Equipment to site and Mechanical Handling: • The process modules and containerized goods will be transported using trucks and off-loaded on site with heavy duty cranes • Cranes will support the site installation works throughout the duration of the construction activities. • SPDC shall establish lay-down area (size to be provided) near the gas plant, but within SPDC acquired area to carry out hot work (welding activities). ---Provide site map Accommodation Of Site Personnel • At peak period, about 50 personnel will be on site, but temporary site accommodation is planned for about 25 SPDC and Contractor workers. The other 25 personnel will be drawn from the nearby communities. • The temporary camp site (size; 1Ha -----) will be located near the gas plant, and within SPDC acquired area. 2.8 Drilling of one (1) New Well 2.8.1 Subsurface (Drilling) Activities The drilling activities involve preparation of well locations, campsite, access road for the new well from the existing Well 28, drilling and production testing of wells and site reinstatement. 2.8.1.1 Well Location/Access Road Preparations The well location activities will also include construction of campsite, which will be situated in the vicinity of the well location, along the existing road, which may require some repair work. Activities to be undertaken prior to actual construction work include soil investigation. These will be followed by location clearance, earthwork, construction of slabs (for cellar, generator, chemicals etc), stabilisation of location/campsite and access road. Surfacing with asphalt and blockwall fencing of location/campsite will then follow. A plot size of about 60 m x 110 m will be required for the drilling location or campsite. The completion of location preparation is expected in about 3 calendar months from the time the contractor is mobilised to site. 2.8.1.2 Drilling of NAG Well To minimise landtake and other impact on the environment, the proposed NAG well will be drilled closed to Well 28. 2.8.1.3 Waste and/or By-Products Generated This section describes the waste and by-products that could be generated during drilling activities. Drilling Waste The drilling waste management principles in this project will focus on waste minimisation and recycling. Drilling wastes expected to be generated during the drilling operations are: • Drill cuttings / excess or spent drilling mud and completion fluids • Rig wash (Detergent) water. • Cementing waste. • Discarded consumables. • Domestic waste (solid and sewage). • Drilling effluents. 2-6
Chapter Two Project Justification Drilling a hole/well is achieved by making up the bottom-hole assembly (BHA) below pipes. Rotating this assembly generates formation cuttings. During this operation, a special fluid (mud) is continuously pumped through the pipe and comes out of the drilling bit. The mud carries the drilled cuttings through the annular space between the drill string and the hole to surface. The drilling mud is a mixture of inert bentonite suspended in a liquid phase with barite as weighting material. The liquid phase may be made up by water and/or pseudo-oil. The main constituents of the water-based mud are bentonite and barites, both of which are natural minerals. The type of mud generally in use is made up of the following components: Spud (Gel Suspension) mud for the upper hole section. This contains bentonite, polymer additives {e.g. CMC HV} and KCl (shale inhibitors). Pseudo Oil Based Mud (POBM) system will be used for the lower section of the hole (below 9 5 /8” casing depth). Other functions of the mud are to: Exert hydrostatic pressure on the down-hole and prevent the entry/migration of the formation fluid into the well bore; Suspend drill cuttings in the hole when the mud pumps are not running; Lubricate and cool the drill bit and drill string; Deposit an impermeable cake on the wall of the ‘well bore’ effectively sealing and stabilising the bore of the hole being drilled. The wells will be drilled using water based mud system from surface to 9-5/8” casing depth at + 10,000 ft. Thereafter, POBM will be used to drill to total depth (12,000 ftss). The two mud systems will be salvaged for re-use. Approximately 190 m 3 of drill cuttings would be generated from each drilling operation. Wastewater shall be treated/flocculated and used for building new mud and also for the rig and equipment washing. The wastewater and drilled cuttings from the drilling operations will be channeled into waste pits. A pay loader shall be used to scoop out the drilling waste from the waste pit into cutting skips. The tipper transports the cuttings in skips to the approved cuttings re-injection well (Insert well name) for re-injection. Non Drilling Waste Discarded consumables include chemical bags, drums, scrap metals used in constructions etc. All these will be trucked back to Effurun-2 or Shell Industrial Area, Waste Recycling Depot in Warri. A strict inventory control of all chemicals in use shall be maintained. All chemicals, lubricating oils and fuels will be stored in containers and safely placed in a sheltered area on the rig. Appropriate Safe Handling of Chemicals (SHOC) cards would be provided for every chemical on board the rig for the safety of personnel and the environment. Human Waste All human wastes shall be treated on site using internationally standard in-built biological sewage treatment plant. This provides an excellent way of handling all human wastes on board the rig. Under normal circumstances, the total number of personnel on board the rig is not expected to exceed one hundred (100). 2.8.1.4 Risk of Accidents Resulting in Pollution or Hazards Accidental spills can be as a result of a blow out, or leaking diesel or oil tanks. A blow out is an uncontrollable discharge of hydrocarbon from the formation. Though the chance of a blow out is very low, the potential impact on environment is very high. The primary safeguard against a blow out is the pressure exerted by the drilling mud. The mud shall be tested/checked regularly (every 15 minutes on site) to ensure the properties and the weight are in order. The secondary control is the equipment 2-7
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Chapter Five Mitigation Measures Mi
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Chapter Six Environmental Managemen
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Chapter Seven Consultation CHAPTER
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Chapter Eight Conclusion and Refere
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Environmental Impact Assessment of
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Environmental Impact Assessment of
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1 Mobilization Air quality Light/So
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Appendixes APPENDIX 2 METHODOLOGIES
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Appendixes SOIL NORTHINGS EASTINGS
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Appendixes diseases of crops. Disea
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Appendixes The elevation of each bo
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Appendixes held with the Chairman o
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- General sanitary conditions in th
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3.4.6 Health and Well being a) Adul
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Appendixes - Possible impact of the
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2.8.4 Tertiary 2.8.5 No formal educ
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Appendixes 4.11.6 N61,000 - N70,000
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Appendixes 5.6.4 Noise nuisance fro
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OBEN GAS DEVELOPMENT PROJECT

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