What are gas show, connection gas and trip gas?

You may have heard about gas show, connection gas and trip gas. What are differences of those term?

Gas show: It is gas that appears in drilling mud and it indicates the presence of gas zones or soluble gas in oil.

Connection gas: It is relatively small amount of gas that enters well when mud pump is stopped because ECD (equivalent circulating density) decreases when stop pumping. Connection gas indicates that mud weight in hole is less than formation pressure.

The difference of gas show and connection gas:If there is connection gas, gas shown in a mud logger screen increases and decreases sharply like small gas peak; however, gas show demonstrates the smoother curve than connection gas. Lag stroke, lag time are used to  find where the location of connection gas or gas show comes from. Especially, when the connection gas presents, lag time of gas peak will be relative to the time when pumps are off.

Trip gas: It is gas entering to well bore when tripping out of hole. There are several factors as balled-up bit,  fast pulling out rate, bigger diameter BHA, etc can create swab effect that can reduce hydrostatic pressure while tripping out of hole. If too much reduction in hydrostatic pressure is present, formation gas can influx into the well bore, called “Trip gas”.

Reference book: Well Control Books

Related Post

Floating Drilling Power Point Presentation from Te... I've got the excellent presentation in the topic of Floating Drilling from Texas AM. This is very useful for many people in the drilling business. ...
Animal You Caught While Working in the Oilfield We have a post in Facebook Fanpage (https://www.facebook.com/drillingformulas) about animal that you cauguth while you were working in the field.  The...
The deepest depth on Norwegian shelf by Mærsk Gall... Congratulate to Mærsk Drilling for making the record yesterday. With a total depth of 5,941 metres(19,491 fr), Mærsk Gallant has beaten the record ...
What Threatens the Future of the Oil and Gas Indus... In the future the oil and gas industry faces numerous challenges. There’s have been some large spills and more environmental concerns in the oil and g...
Share the joy
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
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Your email address will not be published.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 *