自升式平台表层钻遇古河道卡钻处理措施

Treatment Measures for Stuck in Palaeochannel Encountered by Surface Drilling of Jack-up Platform

肖夏

XIAO Xia

中海石油（中国）有限公司深圳分公司深水工程技术中心，广东深圳　518067

Deepwater Well Engineering & Operation Center, Shenzhen Branch, CNOOC (China) Ltd., Shenzhen Guangdong 518067, China

表层卡钻是海洋钻井中极易发生、需要较高处理技巧的复杂情况之一。由于表层地质松软，加上发育古河道的地质沉积复杂特性，如果表层卡钻处理措施不当或者不及时，极易造成卡钻复杂情况进一步恶化，引发更严重的钻井工程难题。该文以南海东部EP-X区块某井表层ϕ914.4 mm井眼发生卡钻及快速解卡为作业案例，分析了地层特性、井身结构、引发卡钻的具体原因，并提出了钻遇古河道引起表层卡钻的一种下入小钻具冲洗的快速解卡方法，对预防和处理类似表层卡钻事件具有良好的指导作用。

Surface sticking is one of the complex situations that are easy to occur and need relatively high handling skills in offshore drilling. Due to the soft texture surface and the complex geological deposition of the development of palaeochannel, if the surface sticking treatment measures are not appropriate or not timely, it is easy to cause the complex situation of sticking to further deteriorate, causing more serious drilling engineering problems. In this paper, the operation case of sticking and quick unblocking of ϕ914.4 mm wellbore in a well of EP-X block in the eastern South China Sea is taken as an example. The formation characteristics, wellbore structure, and the specific causes of sticking are analyzed, and a fast unblocking method of running small drilling tools to flush the surface sticking caused by drilling in the palaeochannel is proposed, which has a good guiding role in preventing and dealing with similar surface sticking events.

https://doi.org/10.3969/j.issn.1008-2336.2023.03.090