# Well Control Training

Quality control – Process Assurance – Engineering – Training Specialists

Quality control – Process Assurance – Engineering – Training Specialists

Well Control Training

A Well Control Training Manual extract

- A Convertion Factor Well Control Training extract, taken from the Fearnley Procter Well Control course manual.

The pressure exerted by a column of fluid depends on its density (weight) and vertical height or depth (the fluid width or shape has no bearing on the pressure). In well control the hydrostatic column is our primary method of control. To find the pressure exerted at any point in the wellbore, we can use the following hydrostatic pressure formula

**Hydrostatic Pressure (psi) = Mud Weight (ppg) x 0.052 x Depth (ft) **

Following, is an explanation of why we use the conversion factor 0.052

We use this for all our well control calculations to maintain BHP and control of the well.

- 1 cubic foot contains 7.48 U.S. gallons
- A fluid weighing 1 ppg would weigh 7.48 pounds per cubic foot
- The pressure exerted by one foot height of fluid over the area of the base would be:

- Therefore, a one foot high column of 1 ppg fluid would exert 0.052 psi on its base.
**0.052 is the pressure gradient, psi/ft, of****1 lbf/gallon fluid.**

- Specific Gravity (mud weight) x 0.433 = psi/ft (pressure gradient)
- Pounds per cubic foot (mud gradient) ÷ 144 = psi/ft (pressure gradient)
- Kilogrammes per cubic metre x 0.00044 = psi/ft (pressure gradient)
- The last equation may be easier to use when written as:

Kilogrammes per cubic metre ÷ 2262 = psi/ft (pressure gradient)