Maximum influx height to equal the maximum allowable shut-in casing pressure

You know how the maximum allowable shut in casing pressure (MASICP) from the leak off test data and your current mud weight in the well. Moreover, you can use the MASICP to determine the maximum influx height that you can be able to control in the well control situation.

influx height

The following formula shows how to determine the figure:

Influx Height = MASICP ÷ (current mud gradient – influx gradient)

The unit of each parameter is listed below:

Influx height in ft

maximum allowable shut in casing pressure (MASICP) in psi

current mud gradient in psi/ft

influx gradient in psi/ft

Note: if you can convert mud weight into psi/ft, please read this link, convert mud weight to pressure gradient.

With this following information, determine the maximum influx height.

maximum allowable shut in casing pressure (MASICP) = 900 psi

Mud gradient = 0.55 psi/ft

Influx gradient = 0.13 psi/ft

Maximum influx height = 900 ÷ (0.55-0.13) = 2143 ft

Please find the excel sheet for calculating the maximum influx height.

Ref book: Drilling Formula Book Formulas and Calculations for Drilling, Production and Workover, Second Edition

Share the joy
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  

Related Post

Importance of Choke Drill and Its Procedure Choke drill is one of well control drills that will improve crew competency in driller’s method. The advantages from the choke drill are as follows: ...
Cutting Carrying Index – Simple Tool To Dete... To get the good idea on how good of the hole cleaning is, the another method called Cutting Carrying Index (CCI) is utilized. The CCI is an empirical ...
How to Assess Material Requirements for Drilling O... Drilling supervisors must be responsible for assessing material requirements for the drilling operation at a drilling rig. There are several followin...
Long History of Forties Field North Sea This is the story of Forties oil field which is generally known as the field where offshore production of oil was started throughout North Sea. At tha...

About DrillingFormulas.Com

Working in the oil field and loving to share knowledge.
Tagged . Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *