Well Planning Process

The well planning process can be broken down into stages. Each stage is discussed in more detail later on in this chapter. Chapters 13 and 14 show how the well planning process fits into the overall drilling operation.

1. Defining of well objectives

Why is the well to be drilled? Will it be a wildcat exploration well or an appraisal or development well?

  1. Obtaining consent to drill from authorities
  2. Collection of data

All relevant data from seismic surveys and offset well reports must be scrutinised to ensure that the optimum drilling programme is prepared.

4. Establishment of subsurface pressure regimes

One of the main purposes of studying the collected data is to attempt to predict the formation pore pressures that are likely to be encountered and plan for them accordingly.

5. Establishment of fracture gradients

Fracture gradients must be established in order to select casing seats.

6. Drilling programme preparation

Using the collated data, the programme is constructed in such a manner that well objectives can be met.

7. Rig specification

From the draft programme a specification of the rig required to drill the hole can be prepared. This is covered in detail in chapter 9.

8. Authorisation for expenditure (AFE) preparation

Using the AFE well costs are budgeted. This is covered in detail in chapter 5.

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