What is “Connection Gas”?

“Connection Gas” is distinct increase of gas above a normal background gas level when bottom up occurs after a connection. If you see a small high gas peak in short period of time and when you calculate back you will see that it comes from every connection, you can suspect that this is the Connection Gas.

The connection gas occurs because total pressure (hydrostatic pressure + friction pressure) temporarily decreases during making connection. Basically, it means that you lose equivalent circulating density due to pumps off. In addition, the connection could be happened because of swabbing effect when the drill string is worked off bottom prior to making connection.

The connection gas can indicate that pressure between hydrostatic pressure exerted by drilling fluid and formation pressure is almost in balance condition. Therefore, when you see the connection gas, you should consider weighting up mud in the system before resuming drilling operation or tripping operation.

Reference book: Well Control Books

Related Post

Concrete Gravity Structures – Offshore Struc... As the name suggests, the concrete gravity structure is reliant on its own weight, and the capability of the seabed to maintain that weight, in order ...
Reel Lay Pipeline Installation Method Reel lay method installs offshore pipeline by sending the pipeline from a reel mounted on a special pipeline installation vessel. Instead of connectin...
Suction Anchor Calculation Suction anchor or suction caisson is an offshore foundation which is quite popular for offshore installation. It utilizes a negative pressure concept ...
Gas Behavior and Bottom Hole Pressure in a Shut in... This is a classic example demonstrating how bottom hole pressure will be due to gas migration in a shut in well. This is very important concept in wel...
Share the joy
  • 1
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Your email address will not be published.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.