Circulate Out The Influx Holding Drill Pipe Pressure Constant

After the pumps are brought up to desired kill rate and drill pipe pressure stabilize, personnel must observe and record the drillpipe pressure. For the first circulation, you must hold drill pipe pressure constant in order to maintain constant bottom hole pressure. To achieve maintain drill pipe pressure constant, personnel must manipulate the choke while circulating.


When gas in drilling fluid is circulated to the surface, the gas will naturally begin to expand because of decrease in pressure. The expansion of gas in mud will result in increasing both pit volume and casing pressure. This time is the most critical period of the well control operation. If personnel panic about it, the operation could be turned out from a good operation to a disaster.

Sometimes, you may have difficulty to bleed the gas off fast enough to keep the drill pipe pressure within required limits. As you know, excessive drill pipe pressure can result in formation breakdown. If you cannot release gas fast enough from the annulus to prevent an increase in drill pipe pressure, you must show down pump rate to compensate the pressure.

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

Well Control Books

Related Post

Drill Pipe Pressure Schedule Calculation for Wait ... This example demonstrates how to determine drill pipe pressure schedule for wait and weight method.   Well Information Current mud weigh...
Understand U-Tube Concept and Importance of U-Tube We can likely use the behavior of one of the fluid columns to describe behavior regarding what is happening in another side of fluid column, if two fl...
Free Useful Well Control Spreadsheet – All Importa... There are a lot of people who are interested in well control and we would like to help them learn and make their life easier by sharing the well contr...
Bullheading Well Control Method Bullheading is one of the well control methods which may be utilized in some occasions in order to control the well. Concept of bullheading is to pump...
Share the joy
  • 4
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
    4
    Shares
Tagged , . Bookmark the permalink.

About DrillingFormulas.Com

Working in the oil field and loving to share knowledge.

Leave a Reply

Your email address will not be published.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

This site uses Akismet to reduce spam. Learn how your comment data is processed.