Wellheads, Xmas trees and BOPs for Slim Hole Wells
Slimming down wells can have a substantial impact on the cost and size of wellheads, Xmas trees, and BOP stacks. As a rough guide the weight, size, and hence costs of these components is proportional to the square of the final hole size for a given well. When using the downsized conventional concept the use of liners can reduce the size of surface equipment even further, as can the use of monobore completions.
On land operations, the cellar can be shallower or even eliminated. Cellars act as a . . .