Table of Contents

- How do you calculate bottom hole pressure?
- How do you calculate bottom hole pressure from wellhead pressure?
- What is the hydrostatic pressure at the bottom hole?
- How do you calculate hydrostatic pressure?
- How is hydrostatic pressure calculated?
- How do you calculate hydrostatic pressure in drilling?
- How do you calculate formation pressure gradient?

## How do you calculate bottom hole pressure?

Bottom Hole Pressure Relationship

- Bottom Hole Pressure (BHP) = Surface Pressure (SP) + Hydrostatic Pressure (HP)
- The first case: Hydrostatic column is water which is equal to formation pressure gradient so SP is equal to 0 psi.

### How do you calculate bottom hole pressure from wellhead pressure?

Determine Bottom Hole Pressure from Wellhead Pressure in a Dry Gas Well

- Pwh = wellhead pressure in psia (absolute pressure)
- H = true vertical depth of the well.
- Sg = specific gravity of gas.
- R = 53.36 ft-lb/lb-R (gas constant for API standard condition air)
- Tav = average temperature in Rankin (Rankin = Fahrenheit + 460)

#### What is the hydrostatic pressure at the bottom hole?

The bottom hole pressure (BHP) is equal to the hydrostatic pressure (HP) on the annular side. If shut in on a kick, bottom hole pressure is equal to the hydrostatic pressure in the annulus plus the casing (wellhead or surface pressure) pressure.

**How do you calculate reservoir pressure?**

The reservoir pressure can be determined by measurement using bottomhole pressure gauge, well testing, or graphics. Generally, formation pressure is assessed by the pressure gradient and the pressure coefficient.

**How do you calculate formation pressure?**

Formation Pressure from Kick Analysis

- Formation Pressure in psi.
- SIDDP (shut in drill pipe pressure) in psi.
- Hole TVD (true vertical depth) in ft.
- Current Mud Weight in ppg.
- Example: Well depth = 8,500’MD/8,000 TVD.
- SIDPP = 300 psi.

## How do you calculate hydrostatic pressure?

The pressure in a liquid at a given depth is called the hydrostatic pressure. This can be calculated using the hydrostatic equation: P = rho * g * d, where P is the pressure, rho is the density of the liquid, g is gravity (9.8 m/s^2) and d is the depth (or height) of the liquid.

### How is hydrostatic pressure calculated?

#### How do you calculate hydrostatic pressure in drilling?

In US oilfield units, this is calculated using the equation: P=MW*Depth*0.052, where MW is the drilling fluid density in pounds per gallon, Depth is the true vertical depth or “head” in feet, and 0.052 is a unit conversion factor chosen such that P results in units of pounds per square in. (psi).

**What is the pressure gradient formula?**

The pressure gradient can be viewed as the force driving flow (F), where F = ΔP/R. This relationship is based upon Ohm’s Law from physics in which current equals the voltage difference divided by the resistance (I= ΔV/R).

**What is the pressure in reservoir?**

1. n. [Geology] The pressure of fluids within the pores of a reservoir, usually hydrostatic pressure, or the pressure exerted by a column of water from the formation’s depth to sea level.

## How do you calculate formation pressure gradient?

Calculating Pressure Gradient:

- Average SG = SG of water x Water Cut + SG of oil x (1-Water Cut)
- Average Gradient = 0.433 x Average SG.
- Fluid Height = Pressure / Gradient.