深海海底钻机海底沉积物取芯过程扰动水压分析

Analysis of Disturbed Water Pressure in Seabed Sediment Coring Process of Seafloor Drill

深海海底沉积物取样是开展海洋地质科学研究、海底矿产资源勘探、海洋工程建设勘察等工作的前提.针对海底沉积物取芯过程中取芯管内海水压力升高造成样品扰动问题,本文以深海海底钻机沉积物取芯钻具为研究对象,建立了沉积物取芯过程扰动水压模型;结合海牛号深海海底取样钻机设计,分析了钻具压入速度、取样管尺寸和过流小孔直径对扰动水压的影响.研究结果有利于钻具结构、取芯工艺优化,对发展深海海底钻机低扰动勘探取样技术具有重要意义.

Sampling of deep-sea seabed sediments is a prerequisite for the development of marine geological scientific research,seabed mineral resource exploration,and marine engineering construction surveys.Aiming at the problem of sample disturbance caused by the increase of seawater pressure in the core tube during the coring process of submarine sediments,this paper takes the sediment core drilling tool of the seafloor drill as the research object,and establishes the disturbance water pressure model of the sediment core process.Combined with the design of the“Hainiu”seafloor drill,the influence of drilling tool intrusion speed,sampling tube size and waterway hole diameter on the disturbance water pressure is analyzed.The research results are conducive to the optimization of drilling tool structure and coring technology,and are of significance to the development of low-disturbance exploration and sampling technology for seafloor drill.