Downhole Throttling Technology for Gas Hydrate Prevention in Deep Gas Wells of Tarim Oilfield

Song Zhonghua; Zhang Shicheng; Wang Tengfei; Shen Jianxin; Duan Yuming; Liu Lanying

doi:10.3969/j.issn.1001-0890.2014.02.018

Volume 42 Issue 2

Mar. 2014

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Petroleum Drilling Techniques > 2014 > 42(2): 91-96. > DOI: 10.3969/j.issn.1001-0890.2014.02.018

Song Zhonghua, Zhang Shicheng, Wang Tengfei, Shen Jianxin, Duan Yuming, Liu Lanying. Downhole Throttling Technology for Gas Hydrate Prevention in Deep Gas Wells of Tarim Oilfield[J]. Petroleum Drilling Techniques, 2014, 42(2): 91-96. DOI: 10.3969/j.issn.1001-0890.2014.02.018

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Downhole Throttling Technology for Gas Hydrate Prevention in Deep Gas Wells of Tarim Oilfield

1.
College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing, 102249, China;
2.
Development Department, Tarim Oilfield Company, PetroChina, Korla, Xinjiang, 841000, China;
3.
School of Petroleum Engineering, China University of Petroleum(Huadong), Qingdao, Shandong, 266580, China

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Received Date: July 08, 2013
Revised Date: February 27, 2014

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Abstract

The downhole throttling technique for gas hydrate prevention has been studied for prevention hydrate blockage in high pressure gas wells.Hydrate formation temperature-pressure was predicted by using hydrate formation prediction model for high-pressure gas well.Temperature and pressure of the fluid in the wellbore in production process was forecasted by gas well pipe flow model.And the section hydrate plugs likely to form was analyzed.Downhole throttling temperature and pressure predictive models were constructed based on throttle node.Comparison of the pressure and temperature distribution in the wellbore up and down the downhole throttling shows the section hydrate likely to form in Well LN422 is in the section above 500 m in depth.Wellhead pressure of Well LN422 reduced from 29.2 MPa to 12.0 MPa after throttling,and the wellhead temperature rose from 21.0 ℃ to 23.7 ℃.The temperature throughout the wellbore is higher than the critical hydrate formation temperature.The results show that downhole throttling technique can significantly reduce wellbore pressure of high-pressure gas wells,reduce the risk of hydrate plugs formation,and effectively extend the repair free period.
- gas well,
- hydrate,
- prediction model,
- downhole throttling,
- Tarim Oilfield

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References

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