## Hydraulicing Casing Calculation Example

For the previous topic, Hydraulicing Casing (pressure to lift the casing while cementing), you already know the concept. This topic will demonstrate you how to figure out if the casing will be hydraulically lifted while pumping cement.

Example:

Casing 9-5/8”, 40 ppf (pound per foot), ID of casing = 8.835”

Casing is set at 3,200’MD/3,000’TVD

Top of cement at 600’MD/550’TVD

Previous casing shoe (13-3/8”) = 1000’MD/900TVD

Cement weight = 14.0 ppg

Mud weight = 9.5 ppg

Displacement fluid weight (Brine) = 8.4 ppg

What is the condition at the static condition after cement in place?

What is the maximum pressure that we can apply before the casing is hydraulically pumped out of the well?

## Hydraulicing Casing (pressure to lift the casing while cementing)

During cementing operation, pumping cement and displacement fluid can lift the casing. Some people call “pump out of the well”. This situation can be occurred and there are some reasons as follows:

• Lightweight casing string

• Large casing diameter

• High density of cement

• Low density of displacement fluid

• High annular pressure loss

• High pressure trapped in the annulus due to bridging

### How is the casing lifted during cementing?

Under A Static Condition

The casing can be hydraulic out of hole due to unbalance of hydrostatic pressure. See the figure below for more understanding.