Wellsite Selection and Construction
The selection and construction of an oil and gas wellsite is always conducted using BNK corporate criteria and best industry practices. During the development of the site, drilling and completion operations, you can expect to see an increase in heavy traffic on the roads surrounding the site as equipment such as the drill rig, bulldozers, graders, water trucks and other heavy equipment is transported to and from the site. This traffic increase usually lasts a few weeks and once well drilling and completion operations are finished, should decrease substantially.
The initial steps in final wellsite selection are the identification of several potential wellsites following an extensive geological and seismic review of all available data which leads to the identification of general areas to drill an exploration well. At this point, the following process further refines the selection :
- GIS (Geographic Information System) review to immediately exclude all sensitive zones and review access
- Desktop review to identify water access, archeological sites, ecological sites, etc.
- Initial visit to validate findings to date and prioritize wellsites
These preliminary steps ensure the corporate criteria are followed:
- Maximum distance from nearby residential areas, protected areas, areas of natural interest, archeological zones, etc.
- Review of agricultural areas to ensure minimum inconvenience
- Review of access and transport routes to minimize disruptions
- Review of topography to ensure minimal earthworks for the lease construction
- No deforestation
- Near water sources and known aquifer depths
Once a wellsite is identified, the local communities and landowners are contacted to discuss the potential use of approximately 100 m x 130 m portion of land for wellsite construction. A detailed Environmental Impact Assessment (or at a minimum a Preliminary Environmental Risk Assessment - PERA) is initiated to:
- Evaluate in detail the potential impact of the exploration projects on flora, fauna and the overall surrounding environment (Natura 2000, parks, habitats, etc.) including below the surface
- Evaluate the surrounding structures, historical landmarks, archeological locations, local inhabitants, air and noise, chemical use and transport
- Evaluate the wellsite construction, drilling and completion operations and eventually wellsite reclamation
The EIA is then submitted to competent agencies within the local, regional and/or national governments for review, discussion and approval.
Once selected and approved, the wellsites are constructed using best industry practices to:
- Minimize the discharges of pollutants, including sediment, in storm water both during and after construction activities
- Minimize surface impact
- Remove potential surface contamination by installation of an impermeable membrane (see Figure 1)
- Provide a second barrier against potential surface contamination by using secondary containment systems (diesel, mud additives, etc. - See Figure 2)
- Base line samples
- Fresh water samples are taken from all nearby wells and surface water sources before, during and after all operations and continuously thereafter
- Soil, noise, air and seismicity baselines are taken on and/or near the wellsite before, during and after all operations