摘要
双梯度钻井技术是近年来发展起来的一项新技术,可解决深水钻井作业的诸多复杂问题。其中可控钻井液液面系统隔水管中的气体运移是双梯度钻井作业首要考虑的问题,如果处理不当,则会对作业人员、钻机和井构成极大威胁。鉴于此,美国得克萨斯A&M大学的研究人员通过室内试验研究,探讨了钻井过程中隔水管中气体运移的物理过程。试验结果表明:高钻井液流速能够消除单个气泡,形成更加分散的气泡体系,从而有助于气体排出;在低入口流量下,当气体到达三通管处时,气泡尺寸变大,并在较短时间内向上运移至隔水管模型顶部,排出的气体较少;气体运移受排出速率的影响,在高排出速率下,大气泡快速运移至三通管处,然而,一旦气泡运移至排出管线以上的某一点处,运移也相应放慢。试验结论对于推动我国双梯度钻井技术的发展具有重要的参考作用。
Duel-gradient drilling technology is a new technology developed in recent years, which can solve many complex problems in deepwater drilling. The gas migration in the riser of the controllable drilling fluid surface system is the primary consideration in dual-gradient drilling operations. Improper handling can pose a great threat to crews, rigs and wells. In view of this, researchers at Texas A＆M University conducted an in-house experimental study to explore the physical process of gas migration in riser during drilling. The experimental results show that the high drilling fluid velocity can eliminate single bubbles and form a more dispersed bubble system, which contributes to the gas discharge. At low inlet flow, when the gas reaches the T-branch pipe, the bubble becomes larger, and migrates upward to the top of the riser model in a short period of time, resulting in less discharged gas. At high dis-charge rates, the large bubbles are rapidly transported to the T-branch pipe. However, once the bubble migrates to a point where the velocity decreases, the velocity slows down accordingly. The conclusion of the experiment has an important reference for promoting the development of duel gradient drilling technology in our country.
出处
《石油机械》
北大核心
2018年第1期16-20,共5页
China Petroleum Machinery
关键词
双梯度钻井
隔水管
可控钻丼液液面系统
气体运移
试验研究
duel gradient drilling
riser
the controllable drilling fluid surface system
gas migration
experi-mental study
