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活动式井下节流器结构优化设计
Optimized structural design of mobile-type downhole chokes
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- DOI:
- 作者:
- 田祥有，刘宸希，华金友，王亚龙，吴谋庚，高 鹏
Tian Xiangyou, Liu Chenxi, Hua Jinyou, Wang Yalong, Wu Mougeng, Gao Peng
- 作者单位:
- 1.天津北海油人力资源咨询服务有限公司深圳分公司，广东深圳 518105； 2.中海石油（中国）有限公司深圳分公司，广东深圳 518105
- 关键词:
- 活动式井下节流器；卡瓦；密封系统；有限元仿真
mobile-type downhole choke; slip; sealing system; finite element simulation
- 摘要:
- 井下节流器是油气开采过程中实现气体节流降压的关键部件，针对卡瓦坐封可靠性不足、胶筒密封不
良等结构性问题，开展活动式井下节流器结构优化设计。在研究井下节流器结构特点和工作原理的基础上，开
展节流过程中温降理论分析；基于ABAQUS软件构建活动式井下节流器仿真模型，研究卡瓦数量、卡瓦齿间
距、胶筒开槽形状和胶筒内壁开槽长度等关键参数对卡瓦锚固强度和胶筒密封性能的影响。结果表明，经优化
设计的活动式井下节流器在卡瓦数量为6、卡瓦齿间距为0.3 mm时，卡瓦结构应力集中程度最低，承载强度
最优，胶筒开槽形状为三角形、内壁开槽长度为20 mm时的环空密封效果最优。基于优化后的结构参数，研
制了活动式井下节流器样机并在现场成功应用，该节流器可将气井入口压力从25 MPa降至7.2 MPa，并有效
解决了气井生产过程中的冰堵问题。
The downhole choke is a key component for gas throttling and pressure reduction during oil and gas production. To address structural issues such as unreliable slip setting and poor sealing performance of rubber sleeves, this paper carries out an optimized structural design for mobile-type downhole chokes. Based on research on structural characteristics and working principles of downhole chokes, theoretical analysis of the temperature drop during throttling is conducted. A simulation model of mobile-type downhole chokes is built by adopting ABAQUS software, and the effects of the slip number, slip tooth spacing, rubber sleeve groove shape, and internal groove length on the sealing structure of the slips and rubber sleeves are investigated. Results show that the strength of the optimized mobile-type downhole choke achieves the minimum stress concentration and optimal bearing strength with the slip number of 6 and slip tooth spacing of 0.3 mm, while the best annular sealing effect occurs with a triangular groove shape and an internal groove length of 20 mm. Based on the optimized structural parameters, a prototype of the mobile-type downhole choke is developed and successfully applied in the field. The choke effectively reduces the gas well inlet pressure from 25 MPa to 7.2 MPa and effectively resolves ice blockage problems during gas well production.