海域天然气水合物自入式开采装置及其可行性研究  

Marine natural gas hydrate self-entry exploitation device and its feasibility

作　　者：吴学震 叶鸿宇 蒋宇静[2] 李大勇 姜杰 王刚[4] 公彬[4] WU Xuezhen;YE Hongyu;JIANG Yujing;LI Dayong;JIANG Jie;WANG Gang;GONG Bin(College of Civil Engineering,Fuzhou University,Fuzhou 350116,China;Graduate School of Engineering,Nagasaki University,Nagasaki 852-8521,Japan;College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao 266580,China;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]福州大学土木工程学院,福建福州350116 [2]日本长崎大学工学研究科,日本长崎852-8521 [3]中国石油大学(华东)储运与建筑工程学院,山东青岛266580 [4]山东科技大学矿山灾害预防控制国家重点实验室(培育),山东青岛266590

出　　处：《中南大学学报（自然科学版）》2022年第3期1012-1022,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41907251,52179098);山东省自然科学基金资助项目(ZR2019ZD14);福建省自然科学基金资助项目(2019J05030)。

摘　　要：为解决目前海域天然气水合物试采案例所采用钻井开采技术中存在的深水作业成本高、井筒结构易损坏及长期稳定开采难度大等问题,提出一种新型海域天然气水合物自入式开采装置及方法。该方法无需使用大型的钻井设备,由自入式开采装置携带相关设备依靠重力冲击进入储层,然后进行降压开采,待作业结束后可通过拉拔进行回收,重复使用。建立冲击贯入模型和降压开采模型,分别研究新型开采装置贯入海底储层的规律和降压生产过程中的产气特性。研究结果表明:1)新装置贯入海床深度随其长度和直径增加而增大,最大达370 m可涵盖绝大多数天然气水合物储层的埋深;2)新装置由预制钢结构构成,能够实现更大幅度的降压,产气效率与传统方式相比提高6~14倍。In order to solve the problems of the high cost of deep-sea operation,easy damage to the wellbore structure and difficulty in long-term stable exploitation in the current marine natural gas hydrate trial cases,a novel marine natural gas hydrate self-entry exploitation device and method were proposed.The method does not require the use of large drilling equipment,and the new device carries the relevant devices into the reservoir by gravity impact and then performs depressurization exploitation,which can be reused after the operation.An impact penetration model and a depressurization exploration model were established to study the law of the new device penetrating into the seabed reservoir and the gas production characteristics during the production process.The results show that:1)the depth penetration of the new device into the seabed increases with the increase of its length and diameter,up to a maximum of 370 m,which can cover the burial depth of most natural gas hydrate reservoirs;2)the new device is composed of a prefabricated steel structure,which can achieve a greater pressure reduction,and the gas production efficiency is promoted by 6 to 14 times compared with the traditional wellbore method.

关 键 词：海域天然气水合物 自入式开采装置 贯入规律 产气特性 

分 类 号：TE19[石油与天然气工程—油气勘探]