Loading...

Gas Kick Detection and Modeling in Oil-based Mud

Abbasi Koushki, Mohammad | 2021

366 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54393 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Jamshidi, Saeed
  7. Abstract:
  8. Rapid gas kick detection is an essential tool in safe well control operation. Gas kick can be defined as the uncontrolled release of gas from the formation into the wellbore due to insufficient hydrostatic pressure of the drilling mud. Delay in gas kick detection makes it challenging to control the well properly and may lead to blowout when gas reaches the surface, causing irreparable damage to life, property, and the environment. The usual method of identifying this phenomenon is through surface parameters such as increasing the return flow rate of drilling mud at the surface or increasing pit gain. The use of oil-based mud makes it more challenging to detect. Because, unlike water-based mud in the oil-based mud, the influx gas tends to dissolve into the mud under bottom-hole pressure and temperature conditions at which an unsaturated phase is formed that causes no noticeable change in surface parameters. As this solution reaches the surface, the dissolved gas begins to release due to pressure reduction, which leads to an increase in the gas volume and warning signs of a blowout at the rig floor. However, there may not be enough time to control the well properly or deal with this phenomenon.In this project, simulation of a gas kick in water-based and oil-based mud has been performed, and their results have been compared with each other. The increase in pit gain, drilling mud return flow rate, pressure profile, influx gas flow rate, and void fraction distribution in the wellbore for both water-based and oil-based mud have been investigated, and their corresponding charts have been plotted. The results show that delay of gas kick detection in oil-based mud makes it more difficult to control the well safely, so gas kick in oil-based mud is more dangerous
  9. Keywords:
  10. Modeling ; Well Control ; Gas Solubility ; Water-Based Drilling Mud ; Oil-Based Drilling Mud ; Gas Kick

 Digital Object List

 Bookmark

No TOC