Gas Hydrate Prediction and Prevention During DST in Deep Water Gas Field in South China Sea

2015 ◽  
Author(s):  
Zong Dai ◽  
Donghong Luo ◽  
Wei Liang
Keyword(s):  
South China Sea ◽  
South China ◽  
Deep Water ◽  
Gas Hydrate ◽  
Gas Field ◽  
China Sea ◽  
Prediction And Prevention ◽  
Water Gas

scholarly journals Gas Hydrate Formation Risk and Prevention for the Development Wells in the Lingshui Gas Field in South China Sea

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Donglei Jiang ◽  
Yi Yu ◽  
Yi Huang ◽  
Wenbo Meng ◽  
Jianbo Su ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Deep Water ◽  
Hydrate Formation ◽  
The South China Sea ◽  
The South ◽  
Gas Field ◽  
Gas Well ◽  
China Sea ◽  
Water Gas

Hydrate formation risk is an important challenge in the development of deep-water gas field. Considering the characteristics of the Lingshui (LS) gas field in the South China Sea and the difference of well structures, a model for calculating wellbore temperature and pressure in deep-water gas production well is proposed and verified by the field data. Combining the hydrate equilibrium models with varied gas components, the prediction method of hydrate formation region in deep-water gas well in the South China Sea is obtained. The hydrate formation regions under different operating conditions for a deep-water gas well in the South China Sea were given by the proposed model. The results show that no hydrate formation risk exists in the production operation, but the risk exists in the shut-in and testing operations. Meanwhile, the determination of the hydrate inhibitor injection parameters during the testing operation is studied, and the influence of the inhibitors’ injection concentration and pressure on preventing gas hydrates is analyzed. This work provides useful advice for the prediction and prevention of hydrate formation risk in the development of deep-water gas fields, especially in the South China Sea.

scholarly journals Gas hydrate risks and prevention for deep water drilling and completion: A case study of well QDN-X in Qiongdongnan Basin, South China Sea

2014 ◽  
Vol 41 (6) ◽  
pp. 824-832 ◽  
Author(s):  
Liang ZHANG ◽  
Chong ZHANG ◽  
Haidong HUANG ◽  
Dongming QI ◽  
Yu ZHANG ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Deep Water ◽  
Gas Hydrate ◽  
Qiongdongnan Basin ◽  
China Sea

Deep-water sediment waves as a special gas hydrate reservoirs in the Northeastern South China Sea

2019 ◽  
Vol 101 ◽  
pp. 476-485
Author(s):  
Chenyang Bai ◽  
Guangxue Zhang ◽  
Jing'an Lu ◽  
Jinqiang Liang ◽  
Zhen Yang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Deep Water ◽  
Gas Hydrate ◽  
China Sea ◽  
Sediment Waves ◽  
Hydrate Reservoirs ◽  
Northeastern South China Sea

The Research and Application of ECA Technology for Large Diameter Thick Wall Subsea Pipeline in a Gas Field in Deep Water of South China Sea

2018 ◽  
Author(s):  
Jing Hou
Keyword(s):  
South China Sea ◽  
South China ◽  
Deep Water ◽  
Large Diameter ◽  
Thick Wall ◽  
Gas Field ◽  
Subsea Pipeline ◽  
China Sea ◽  
Girth Welding ◽  
Ocean Environment

In order to ensure the integrity of subsea pipeline in the whole design life, it is very important to carry out quality evaluation for the girth welding since severe ocean environment and installation conditions. In this paper, based on the principle of “suitable for use”, the level 2B, British BS7910 standard fracture assessment criterion is adopted. According to the mechanical properties of the pipe joint, welding method and installation load conditions, the Engineering Critical Assessment (ECA) has been carried out for an export subsea pipeline in a gas field in deep water of South China Sea. Larger allowable initial weld flaws can be accepted through ECA evaluation, the acceptable criterion for AUT inspection in the process of pipeline laying is obtained, which effectively reduce the welding repair rate with significant cost saving and improve installation efficiency.

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