# Effect Evaluation of Drainage Gas Recovery by Velocity String in Sulige Gas Field

• Xiaohong Bai
• Yong Chen
• Binbin Zhao
• Xiongxiong Wang
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

## Abstract

The universal features of the gas wells in Sulige gas field are low pressure, low production rate, and the liquid-carrying capabilities of the wells that are poor. Accompanied with the gas well entering the process of middle and late life span, the pressure of the well bottom gets low and the liquid-carrying capability of the well becomes poorer. Liquid-carrying capability of gas well could be effectively improved by using velocity string. However, the former effect evaluations of drainage gas recovery by velocity string are confined to individual well. On the basis of all the gas wells which use the technology of velocity string in Sulige gas field, classification evaluations are made in this paper according to the pretest gas production rate. The technological principle of drainage gas recovery by velocity string is analyzed, and the model of critical liquid-carrying which fits for Sulige gas field is derived. Then, coiled tubing of φ38.1 mm is optimally selected which serves as velocity string according to this model. Finally, the scope of applications of drainage gas recovery by velocity string in Sulige gas field is obtained and the new application fields of this technology are proposed.

## Keywords

Sulige gas field Velocity string Drainage gas recovery Effect evaluation

## Notes

### Acknowledgements

The authors appreciate the help of Senior Engineer Shuangquan Liu for his support and thank all the workmates for their help with the work.

## References

1. 1.
Cao CY, Liu Y, Wang XJ (2011) The effect analysis of dewatering gas recovery test by small diameter coiled tubing in Sulige gas field. Petrochem Ind Appl 6:30–35Google Scholar
2. 2.
Tuner RG, Hubbard MG, Dukler AE (1969) Analysis and prediction of minimum flow rate for the continuous removal of liquids from gas wells. SPE 2198:75–82Google Scholar

© Springer Nature Singapore Pte Ltd. 2019

## Authors and Affiliations

• Xiaohong Bai
• 1
• Yong Chen
• 1
• Binbin Zhao
• 1
• Xiongxiong Wang
• 1
1. 1.Oil & Gas Technology Research Institute, Changqing Oilfield CompanyXi’anChina
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