天然气水合物井下螺旋-旋流耦合分离除砂器结构优化  

Structural optimization of downhole spiral-swirl coupling separation desander for natural gas hydrate

作　　者：唐洋 谢娜[2,3] 何玉发 李泽良[4] 王国荣 TANG Yang;XIE Na;HE Yufa;LI Zeliang;WANG Guorong(National Key Laboratory of Natural Gas Hydrate,Beijing 100028,China;School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China;Energy Equipment Institute,Southwest Petroleum University,Chengdu 610500,China;PetroChina Southwest Oil and Gasfield Company Northeast Sichuan Gas Field,Chengdu 610500,China)

机构地区：[1]天然气水合物国家重点试验室,北京100028 [2]西南石油大学机电工程学院,四川成都610500 [3]油气藏地质及开发工程国家重点试验室(西南石油大学),四川成都610500 [4]中国石油西南油气田分公司川东北气矿,四川成都610500

出　　处：《中南大学学报(自然科学版)》2025年第3期1184-1197,共14页Journal of Central South University:Science and Technology

基　　金：天然气水合物国家重点试验室开放基金资助项目(2022-KFJJ-SHW);国家重点研发计划项目(2021YFC2800903),国家自然科学基金资助项目(52374011)。

摘　　要：为解决天然气水合物在开采过程中泥砂无法有效分离、回填,导致回收管路堵塞、储层坍塌的问题,本文提出一种井下螺旋-旋流耦合原位分离器结构。采用CFD数值模拟的方法对分离器关键结构参数进行单因素分析,通过正交试验对结构进行优化。仿真结果表明:最大除砂效率为89.55%;在关键结构中,入口螺旋角度是泥砂是否能被有效分离的主要影响因素;最优的结构参数是入口数量为6个、螺旋流道结构为圆角形截面、螺旋流道的流域数量为2道、溢流管深度为100mm,涡流导流板与溢流管底端之间的距离为28mm;室内试验的最大除砂效率为84.46%,与数值模拟的最大除砂效率相对误差为6.03%,证明提出的螺旋-旋流器耦合分离器在天然气水合物井下开采分离除砂中具有良好的性能。In order to solve the problem that mud and sand cannot be effectively separated and backfilled in the process of natural gas hydrate exploitation,which leads to blockage of recovery pipeline and collapse of reservoir,a downhole spiral-swirl coupling in-situ separator structure was proposed.In this study,CFD numerical simulation method was used to analyze the key structural parameters of the separator by single factor analysis,and orthogonal test was carried out to optimize the structure.Simulation results show that the maximum sand removal efficiency is 89.55%.In the key structure,inlet spiral angle is the main factor affecting whether the mud sand can be effectively separated.The optimal structural parameters are as follows.The number of inlets is 6,structure of the spiral flow channel is a rounded section,number of basins of the spiral flow channel is 2,depth of the overflow pipe is 100 mm,and the distance between vortex guide plate and bottom of the overflow pipe is 28 mm.The maximum sand removal efficiency of the indoor test is 84.46%,and the relative error with the numerical simulation is 5.51%,which proved that the proposed spiral-cyclone coupling separator has good performance in the separation and sand removal of natural gas hydrate underground mining.

关 键 词：天然气水合物 井下分离器 计算流体力学 数值模拟 优化设计 除砂效率 

分 类 号：TE973[石油与天然气工程—石油机械设备]