当前位置: X-MOL 学术Energy Sci. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Multiphase flow behavior in deep water drilling: The influence of gas hydrate
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-01-17 , DOI: 10.1002/ese3.600
Jianhong Fu 1 , Yu Su 1 , Wei Jiang 1, 2 , Xingyun Xiang 3 , Bin Li 4
Affiliation  

Hydrate phase transition may bring hidden dangers for well control safety, even accidents of blowout happen in deep water drilling. Accurate calculation of all the drilling parameters is of great importance for well control safety. In this study, the mathematic models of transient heat transfer and multiphase flow have been established with the consideration of hydrate phase transition. Furthermore, the position where hydrate formation is most likely to occur was predicted with the proposed models, and the factors affecting hydrate formation region were also analyzed. Finally, the analysis of the effect of gas hydrate phase transition on some important parameters in well control, such as the pit gain, gas void fraction, and bottom hole pressure, is presented. The results show that hydrates form near the mud line during the drilling and shut‐in stage, but the hydrate formation region will be narrowed as well killing start. Additionally, the hydrate formation region decreased with the increase of flow rate and increased with the increasing shut‐in time, hydrate inhibitors, and riser insulation are presented to prevent hydrate blockage. More importantly, the gas void fraction and pit gain decrease due to the formation of hydrates, leading to the gas kick early detection not timely and gas kick more “hidden.”

中文翻译:

深水钻井中的多相流动行为:天然气水合物的影响

水合物的相变可能为井控安全带来隐患,甚至在深水钻井中也会发生井喷事故。准确计算所有钻井参数对于井控安全至关重要。在这项研究中,考虑到水合物的相变,建立了瞬态传热和多相流的数学模型。此外,用提出的模型预测了最可能发生水合物形成的位置,并且还分析了影响水合物形成区域的因素。最后,对天然气水合物相变对井控中一些重要参数的影响进行了分析,例如井增,气孔率和井底压力。结果表明,在钻井和闭井阶段,泥浆线附近会形成水合物,但水合物的形成区域会变窄,并且开始压井。此外,水合物的形成区域随着流量的增加而减小,并随着关闭时间的增加而增加,提出了水合物抑制剂和立管隔热层,以防止水合物堵塞。更重要的是,由于水合物的形成,瓦斯孔隙率和井坑增益降低,​​导致瓦斯涌动的早期检测不及时,瓦斯涌动更加“隐藏”。
更新日期:2020-01-17
down
wechat
bug