Petroleum Science

, Volume 4, Issue 4, pp 62–65 | Cite as

Relationship between formation water rate, equivalent penetration rate and volume flow rate of air in air drilling

  • Wang Kexiong
  • Zhang Laibin
  • Jiang Hongwei
Petroleum Engineering


Formation water invasion is the most troublesome problem associated with air drilling. However, it is not economical to apply mist drilling when only a small amount of water flows into wellbore from formation during air drilling. Formation water could be circulated out of the wellbore through increasing the gas injection rate. In this paper, the Angel model was modified by introducing Nikurade friction factor for the flow in coarse open holes and translating formation water rate into equivalent penetration rate. Thus the distribution of annular pressure and the relationship between minimum air injection rate and formation water rate were obtained. Real data verification indicated that the modified model is more accurate than the Angel model and can provide useful information for air drilling.

Key words

Air drilling Angel model modified model formation water rate minimum volume flow rate equivalent penetration rate 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Angel R. R. (1957) Volume requirements for air or gas drilling.AIME, 210, 325–330Google Scholar
  2. Cooper L. W. and Hook R. A. (1977) Air drilling techniques. SPE Deep Drilling and Production Symposium held in Amarillo, Texas, 17–19 April, 1977 (SPE paper 6435)Google Scholar
  3. Cui Z. J. (1996) A new method for calculating air drilling parameters.Journal of Jianghan Petroleum Institute, 18(4), 64–68 (in Chinese)Google Scholar
  4. Guo W. C. and Liu H. X. (2001) Calculation method of air drilling and its application software.Drilling & Production Technology, 24(1), 8–12 (in Chinese)Google Scholar
  5. Li A. J. and Wang G. H. (1997) Modeling and research of gas, liquid and solid facies flow of air (atomized) drilling.West-China Exploration Engineering, 9(3), 5–10 (in Chinese)Google Scholar
  6. Lyons W. C. (2000)Air and Gas Drilling Manual. Houston: McGraw-Hill Company. 161–169Google Scholar
  7. Tian S. F. and Adewumi M. A. (1992) A new method of estimating mixture density in air drilling. SPE paper 24960Google Scholar
  8. Zhou Y. C. (2003)Application of Underbalanced Drilling Technology. Beijing: Petroleum Industry Press. 180–183 (in Chinese)Google Scholar
  9. Zhou Y. C., Gao D. L. and Liu Y. G. (2005) A new model for calculating bottom hole pressure of multiphase flow in annulus of underbalanced straight well.Acta Petrolei Sinica, 26(3), 96–99 (in Chinese)Google Scholar

Copyright information

© China University of Petroleum 2007

Authors and Affiliations

  • Wang Kexiong
    • 1
  • Zhang Laibin
    • 2
  • Jiang Hongwei
    • 1
  1. 1.School of Petroleum EngineeringChina University of PetroleumBeijingChina
  2. 2.School of Mechanical and Electronic EngineeringChina University of PetroleumBeijingChina

Personalised recommendations