摘要
为了解决已有的天然气水合物(以下简称水合物)采掘工具不适用于大规模、大范围矿层开采而影响开采效率和经济性的问题,基于水合物固态流化开采法的技术思路及工艺特点,设计研发了一种可用于破碎并收集水合物的伞式工具;依据开采工况建立了该伞式工具的三维结构模型,并通过仿真对其进行了稳态力学模拟分析,进而对其开采效果进行了预估。研究结果表明:①伞式工具处于工作状态时,工具整体不会发生失稳现象,最大应力处发生在刀翼与外管杆的连接处,其应力值小于该处所用材料的屈服强度,其余部位的应力值也均在所使用材料的屈服极限内;②该工具刀翼发生侧偏时,结构上有可能产生形变从而影响开采范围,但不会影响旋转破碎水合物;③在开采扭矩的动力传递中,钻杆最大等效应力值小于材料的抗扭强度,且整体并没有发生扭曲变形,仅产生了可忽略的位移量;④采用伞式工具进行水合物开采,其日采掘量可满足经济性要求,具有用于水合物商业化开采的潜力。
Existing gas hydrate exploitation tools are not applicable in large-scale and large-range mining, so exploitation efficiency and economic performance are affected. In view of this, an umbrella-like tool which is used for crushing and collecting gas hydrates was de- signed and developed based on the exploitation ideas and process characteristics of solid fluidization method. Then, a three-dimensional structure model for the umbrella-like tool was built according to working conditions, and the steady-state mechanical simulation and anal- ysis was carried out. Finally, the exploitation effects were predicted. And the following research results were obtained. First, the whole umbrella-like tool does not lose its stability in the working state. The maximum stress is located at the joint between the arm and the out- er-pipe rod, where the stress is lower than the yield strength of the given material, and the stresses at the rest parts of the tool are also be- low the limit yield strength of the given material. Second, when the arm of the tool is laterally deviated, structural deformation may occur and affect the actual exploiting range, but will not affect the rotary crushing on hydrates. Third, during the power transfer of exploitation torque, the maximum equivalent stress value of the drill pipe is less than the torsional strength of the pipe material. The whole drill pipe has no distortion but only a negligible displacement is generated. Fourth, when the umbrella-like tool is used for gas hydrate exploitation, the daily production can meet the economic requirements, and it has the potential of exploiting gas hydrates commercially.
作者
宋震
孙颖
李凯莉
吕忠蕾
孙浩铭
Song Zhen;Sun Ying;Li Kaili;Lü Zhonglei;Sun Haoming(School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2019年第3期133-139,共7页
Natural Gas Industry
基金
中国博士后科学基金面上项目(编号:2017M623061)
石油天然气装备教育部重点实验室开放基金项目(编号:OGE201702-13)
关键词
天然气水合物
固态流化开采
伞式工具
破碎
设计
结构力学分析
稳态
经济可行性
Gas hydrate
Solid fluidization
Umbrella-like tool
Crushing
Design
Structural mechanics analysis
Steady state
Economic feasibility
