( see also Upstream @ Wikipedia )

The area of Petroleum Industry dealing with exploration and production of hydrocarbons and also called Upstream.

Drilling is essential part of both exploration and production.

Petroleum Production is usually split into two operational areas:

• Surface Production

and

• Subsurface Production

The Surface Production is split into three major areas:

• production gathering

and

• fluid supply and injection

The Subsurface Production is split into three major areas of activities:

• Reservoir Study & Modelling

• Well & Reservoir Surveillance

• Well & Reservoir Management

Routine production operations usually follow Production Strategy which is a part of Field Development Planning.