回转绳索取心工艺在海洋第四系地层钻探中的应用

Appliance of Rotary Wireline Coring Process in Marine Quaternary Stratum Drilling

为解决海洋第四系地层钻探中对于硬黏土层岩心的获取难题,采用回转绳索取心工艺和孔底锤击绳索取心工艺进行钻探取样,在不起钻的前提下,通过互换取心器,实现对不同地层的取心工作。在南海某海洋风电场施工作业中,该工艺有效地解决了波浪升沉带来的影响,获取了高质量的岩心样品。综合分析认为回转绳索取心工艺对于海洋第四系硬黏土地层具有取心扰动小、获取长度长的优点,能弥补孔底锤击绳索取心工艺在海洋第四系地层钻探中的不足,有助于施工效率的提高。

In order to solve the problem of obtaining hard clay cores during drilling in Quaternary,the method of rotary wireline coring process and hammering wireline coring process is introduced to drilling and sampling.It can obtain cores in different lays through exchanging the coring equipment without lifting up the drilling pipes.In the survey of an offshore wind farm in South China Sea,the technology effectively solves the influence of wave heaving and high quality core samples are obtained.Taking the samples got in field into consideration,the rotary coring process has advantage of less disturbance and getting longer samples in hard mud layer.It can cover the shortage of hammering wireline coring process when drilling,which contributes to improving working efficiency.