Because of gas solubility in oil based mud , how to detect shot while drilling to the oil-based mud is so difficult. The gas is soluble in oil based mud and you have to barely see it when gas hit the bottom. Based on my experience, I used to control flow 30 minutes, and I have not seen increasingly in the trip tank. The property looked like static. Then I turned on the pumps to circulate mud and after a few hundred Stokes pumps, oil-based mud was blown onto the turntable. Then I close the well and checked everything, and I finally got the kick in my wellbore.
There is little degree of solubility factors listed below:
• Wellbore temperature
• The pressure in the well
• Type of base fluid used to make mud
• Chemical composition of gas formation
As I said before, even if you take one small volume of gas flow, and you will almost never see . The bad thing is that it will expand rapidly when the gas reaches its bubble point.Sometimes you can see on the surface (breath on the rotary table). The kick more gas you have, the worsening situation, you see, because once the gas expands, the full hydrostatic pressure in the wellbore will be reduced. Since the primary control and is weakened, you may need to take a new influx into the well. What's more, you can end up having an uncontrollable flow (blow).
It is very important that staff must quickly detect kicks and close the property immediately. To make effective detection kick, drilling teams must be prepared to detect small kick by adjusting the alarm levels for wells and flow alarm show. In addition, you may want to check the flow of interpretation frequently if you see any indication of possible move. Please always remember that no matter what system you are using the mud, the faster you close the wells, the fewer problems you have.
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The safety of deep sea drilling is one of the most important areas.
ReplyDeleteIn addition to monitoring the flow rate of the mud pressure measurements can analyze the characteristics of the mud. New electronic methods allow even the smallest changes in the speed of sound through the dissolved gases (a few percent saturation) and due to lower inflows of hydrocarbons are sure to measure and to warn.
This also works with oil based mud.
The digital measurement technology can measure foot securely changes the speed of 0.1 ft/m.
Further details of the measurement technique, see below:
http://www.ibj-technology.com/Kick_Detection.htm
http://de.slideshare.net/fmj2/early-kick-detection
http://de.slideshare.net/Engineers/offshore-gas-kick-detector