Comparative Cost Of Wells

HORIZONTAL VERTICAL COST RATIC

Casing Costs Oil Well

EVENT

VERTICAL

HORIZONTAL

Surface, etc.

$ 80,000

$96,000

Drill to KOP

$326,000

$342,000

Drill to tangent

$465,000

Drill to lower build

$483,450

Drill to horizontal

$495,750

Drill to bottom of hole

$375,364

$649,500

CASING & DRILL BIT SIZES

WEIGHT

Akgun used the commercial finite element program call ANSYS to create and publish a set of charts which models casing (any pipe) stresses and deformation.

The stresses are responsible for the failure of the wall of the tube and the deformation leads to ovality. Ovality in casing prevents the passage of tools if overly severe.

The stresses and deformations are all triaxial.

The use of his charts which follow are explained in the following example.

Akgun showed that the classical beam formula derived in mechanics gave stresses of lesser values than his FEM solution and that Lubinski formula gave values of stress in excess of his FEM solution.

REACTION

REACTION

The relative values may be seen in the figure.

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