Basis of Design and Well Statement of Requirements (“BoD-WSoR”)

• Subsurface uncertainties are closed out or the limits/variance are evaluated and concluded.
• The basis of design for the well construction (drilling and completion) will be developed and agreed upon.
• A well statement of requirements will then be prepared which mainly consists of all the requirements for drilling the well like
  • Rig and rig sizing
  • Long lead items, specifications and quantity
  • Services and scope etc
• Level 2 cost estimate is prepared.
• A risk register with mitigation is developed.
• An execution strategy is agreed upon to meet the schedule.
• A tender strategy for contracts and procurement is developed.
• The basis of well design provides “WHY” a particular well is drilled the way it is designed. This is a tool for understanding, review and approvals. This is a document prepared with all aspects of design including risks, mitigation, time and costs.
• The well programme is based “HOW” a particular well design will be implemented on the rig. This will have a step by step procedure to implement with all aspects of drilling included.
• This stage also involves multi-disciplines like
  • Subsurface
  • Drilling, Testing and Completions
  • Reservoir Engineering
  • Corporate Management
  • HSE and Logistics