Prediction and prevention of hydrate reformation risk in trail production pipes of offshore natural gas hydrate

被引：0

作者：

Zhang J. ^{[1
]}

Sun X. ^{[2
]}

Shan Z. ^{[3
]}

Fu W. ^{[4
]}

Liu Z. ^{[1
]}

Sun B. ^{[1
]}

Wang Z. ^{[1
]}

机构：

[1] School of Petroleum Engineering in China University of Petroleum (East China), Qingdao

[2] College of Computer Science and Technology, China University of Petroleum (East China), Qingdao

[3] Drilling Division of CNPC Offshore Engineering Company Limited, Tianjin

[4] Key State Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou

来源：

Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2022年 / 46卷 / 06期

关键词：

hydrate reformation; offshore natural gas hydrate; prevention method; thermodynamic inhibitor; trail production pipes;

D O I：

10.3969/j.issn.1673-5005.2022.06.004

中图分类号：

学科分类号：

摘要：

Considering the trial production process and wellbore structure characteristics of offshore natural gas hydrate, the prediction method of hydrate reformation in the trial production wellbore was established. The risk and prevention methods of hydrate reformation in the wellbore were explored. The results show that the risk of hydrate reformation in the gas production pipe is high, which mainly distributes in the depth of 790-1020 m. The lower the gas production rate and the water production rate, the higher the risk of hydrate reformation in the production pipe. The greater the subcooling degree of hydrate reformation, the higher the risk of hydrate blockage. The addition of hydrate thermodynamic inhibitor can slow down the growth of hydrate deposition layer in the pipe and prolong the time required for the occurrence of hydrate blockage. Hydrate reformation can be prevented under the synergistic effect of heating at the bottom of the pipe with a length of 50 m and hydrate inhibitor injection with a concentration of 5% in the gas production pipe. The risk of hydrate reformation can be effectively prevented by adding an electric submersible pump in the water production pipe. © 2022 University of Petroleum, China. All rights reserved.

引用

页码：31 / 40

页数：9

共 30 条

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