Pressure Sources & Types of Pressures

Introduction

There are multiple routes or pathways for calculating PBHP (see image below). PBHP can be estimated as shown in the table below.

Type of Well	Source	Description
Pumped (Tubing Pressures not applicable)	Pump Intake Pressures	A good approximation for PBHP if close to perforations or producing zone
	Pump Intake Pressures + Wellbore Model	Wellbore Model to perforations or producing zone if additional accuracy is desired.
	Casing Pressure + Liquid level	(MPP - Liquid Level) x AFA Fluid Gradient to perforations or producing zone Alternatively, the Length of the fluid column can be substituted for wellbore depth in AFA and the wellbore and the algorithms approximate BHP using hydrostatic gradient.
Flowing	Tubing or Casing Pressure + Hydrostatic Gradient + Losses	A simple AFA calculation and provides an basic estimate of PBHP Annular or Tubular flow
Flowing	Tubing or Casing Pressure + Model	AFA Wellbore Model to perforations or producing zone if additional accuracy is desired. Annular or Tubular Flow
An estimated flowing pressure s better than no pressure! If there are missing data or gas, do not worry and let Predico data science handle these issues for you.

Simple Oil Well Example Illustrating Different Types of Pressure

Pressure “Hacks“

Quite often detailed pressure data is not necessary, and few approximations can be used. In the gas example below, we see three (3) distinct pressure trends as marked. Three basic flowing bottomhole pressure estimates could for this well for physics based analysis.

In the second example, an oil well, it is possible to perform the analysis with a sole pressure estimate. Remember, an approximate value of pressure is better than no pressure!