超高压含硫天然气节流阀冲蚀磨损机制研究

doi:10.16265/j.cnki.issn1003-3033.2022.03.008

中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (3): 58-64.doi: 10.16265/j.cnki.issn1003-3033.2022.03.008

超高压含硫天然气节流阀冲蚀磨损机制研究

贾文龙¹(), 李晓宇¹, 成婷婷², 罗召钱³, 徐嘉爽⁴, 韩西成⁵

¹西南石油大学石油与天然气工程学院,四川成都 610500
²中国石油天然气股份有限公司规划总院,北京 100083
³中国石油西南油气田公司川西北气矿,四川江油 621700
⁴中国石油工程建设有限公司西南分公司,四川成都610041
⁵汉正检测技术有限公司, 四川广汉 618300

收稿日期:2021-12-08 修回日期:2022-02-10 出版日期:2022-08-23 发布日期:2022-09-28
作者简介:
贾文龙 (1986—),男,湖北公安人,博士,教授,博士生导师,主要从事油气管道输送等方面的研究。E-mail: jiawenlong08@126.com。
贾文龙教授
基金资助:
国家自然科学基金面上项目资助(52074238); 国家自然科学基金面上项目资助(51974269); 四川省科技计划项目(2020YFSY0053); 四川省科技计划项目(2020YFH0141)

Study on erosion wear mechanism of choke valves at outlet of ultra-high pressure sour natural gas wells

JIA Wenlong¹(), LI Xiaoyu¹, CHENG Tingting², LUO Zhaoqian³, XU Jiashuang⁴, HAN Xicheng⁵

¹Petroleum Engineering School, Southwest Petroleum University, Chengdu Sichuan 610500, China
²PetroChina Planning & Engineering Institute, Beijing 100083, China
³Sichuan Northwest Gas Mine, PetroChina Southwest Oil & Gas Field Company, Jiangyou Sichuan 621700, China
⁴Southwest Branch Company, China Petroleum Engineering & Construction Corporation,Chengdu Sichuan 610041, China
⁵Hanzheng Testing Technology Co., Ltd,Guanghan Sichuan 618300, China

Received:2021-12-08 Revised:2022-02-10 Online:2022-08-23 Published:2022-09-28

摘要/Abstract

摘要：

为保障超高压含硫天然气井安全运行,分析冲蚀磨损速率的影响因素;以压力高于70 MPa、 H₂S体积含量为0~2%的天然气井口笼套式节流阀为例,基于冲蚀磨损理论和Fluent软件,建立冲蚀模型。研究井口节流阀内固体颗粒的运动轨迹和磨损机制,并与实际情况进行对比。结果表明:固体颗粒在井口节流阀上游直管段部分时,冲蚀磨损可忽略不计;在节流阀180°小孔正对的阀腔壁面,冲蚀磨损最严重,但是下游磨损较小;阀腔下半圆弧部分磨损原理为二次冲蚀,直管段入口处和节流阀上半圆弧大多为微切削磨损;H₂S含量和流体的平均流速越大,冲蚀磨损越大,因此,可将天然气的流速控制在331 m/s以内。

关键词: 超高压, 含硫天然气, 节流阀, 冲蚀磨损, 运动轨迹

Abstract:

In order to ensure safe production and operation of ultra-high pressure sulfur-bearing natural gas wells, influencing factors of erosion wear rate were analyzed. Firstly, based on erosion wear theory and Fluent software, an erosion model was established by taking cage sleeve choke valves of natural gas wellheads with pressure above 70 MPa and H₂S volume content of 0-2% as an example. Then, motion track and wear mechanism of solid particles in the valves were studied and compared with actual situation. The results show that when these particles are in upstream straight pipe section of the valves, erosion wear can be ignored, but it will be the worst when they are at valve chamber wall directly opposite the 180° choke hole, and be mildly severe at downstream. The wear principle of lower half arc of valve cavity is secondary erosion, while semi-arc of straight section entrance and upper half arc of throttle valves are mostly micro cutting wear. It is also found that the higher the H₂S content and average flow rate are, the heavier erosion wear will be. Therefore, the flow rate of natural gas can be controlled within 331 m/s.

Key words: ultra-high pressure, sulfur-bearing natural gas, choke valve, erosion wear, motion track

贾文龙, 李晓宇, 成婷婷, 罗召钱, 徐嘉爽, 韩西成. 超高压含硫天然气节流阀冲蚀磨损机制研究[J]. 中国安全科学学报, 2022, 32(3): 58-64.

JIA Wenlong, LI Xiaoyu, CHENG Tingting, LUO Zhaoqian, XU Jiashuang, HAN Xicheng. Study on erosion wear mechanism of choke valves at outlet of ultra-high pressure sour natural gas wells[J]. China Safety Science Journal, 2022, 32(3): 58-64.

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屈服强度/ MPa	腔内磨损情况	最大冲蚀磨损速率/ (10^-7kg·m^-2·s^-1)	平均冲蚀磨损速率/ (10^-7kg·m^-2·s^-1)
848	大多为均匀磨损	7.09	3.90
780	出现较多点蚀麻点	7.78	4.48
720	磨损面积、程度严重	8.24	5.04

节流小孔数量/个	腔内磨损情况	平均流速/ (m·s^-1)	平均磨损速率/ (kg·m^-2·s^-1)
10	轻微麻点磨损	215	1.8×10^-8
8	面积较小,基本为均匀磨损	260	2.62×10^-8
6	磨损较严重	354	3.41×10^-8
4	大面积磨损, 磨损严重	491	3.64×10^-8

超高压含硫天然气节流阀冲蚀磨损机制研究

Study on erosion wear mechanism of choke valves at outlet of ultra-high pressure sour natural gas wells

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