适用于海底钻机的保压绳索取心钻具设计  

Design of the pressure‑coring tool for underwater drilling rig

作　　者：彭奋飞 王佳亮 万步炎 黄筱军[1,2] 唐永辉 彭德平[1,2] PENG Fenfei;WANG Jialiang;WAN Buyan;HUANG Xiaojun;TANG Yonghui;PENG Deping(Hunan University of Science and Technology,National Local Joint Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Safety Technology,Xiangtan Hunan 411201,China;Hunan University of Science and Technology,School of Mechanical Engineering,Xiangtan Hunan 411201,China)

机构地区：[1]湖南科技大学海洋矿产资源探采装备与安全技术国家地方联合工程实验室,湖南湘潭411201 [2]湖南科技大学机电工程学院,湖南湘潭411201

出　　处：《钻探工程》2021年第4期97-103,共7页Drilling Engineering

基　　金：国家重点研发计划项目“海底大孔深保压取心钻机系统研制”(编号:2017YFC0307501);国家自然科学基金项目“硬脆性磨粒对金刚石钻头在硬岩钻进中的性能影响机制”(编号:41702390);湖南创新型省份建设专项“深地地质探测关键技术研究及钻探装备研制”(编号:2019GK1012)。

摘　　要：以维持保压钻具内天然气水合物稳定性为研究目的,针对现有大口径保压钻具存在钻孔直径大、岩心样品直径小、钻具结构复杂、钻具质量重从而不适用于海底钻机使用工况要求的实际问题,对保压钻具的结构重新进行设计并进行了室内保压试验。结果表明:该小口径薄壁保压钻具的尺寸合理、结构紧凑,能够满足海底钻机使用工况要求;室内保压试验表明当压力维持在10 MPa以下的压力值时,6 h以内压力下降15%左右;而当压力维持在10~30 MPa之间的压力值时,6 h以内压力下降10%。该保压钻具在上述压力区间内使用满足设计和使用要求。With maintaining gas hydrate stability in the pressure coring tool as research purposes,and in view of the problems with the existing large diameter pressure coring system,such as small core diameter at large drilling diameter,complex drilling tool structure,heavy weight,which makes it not applicable to the actual working condition of the underwater drilling rig,the pressure coring tool was redesigned structurally and indoor pressure tests were carried out.The results showed that the small diameter thin wall pressure‑coring tool is reasonable in size and compact in structure,which can meet the requirements of the underwater drilling rig.Laboratory tests showed that when the pressure was maintained below 10MPa,the pressure decreased by 15%within 6 hours;when the pressure was maintained between 10MPa and 30MPa,the pressure dropped by 10%within 6 hours,and the pressure‑coring tool can meet the design and service requirements when used within the above pressure ranges.

关 键 词：海洋勘探 海底钻机 保压取心 绳索取心钻具 结构设计 保压试验 

分 类 号：P634.43[天文地球—地质矿产勘探]