棒状柱塞结构优化模拟

doi:10.11885/j.issn.1674-5086.2019.10.24.01

西南石油大学学报(自然科学版) ›› 2019, Vol. 41 ›› Issue (6): 181-186.DOI: 10.11885/j.issn.1674-5086.2019.10.24.01

棒状柱塞结构优化模拟

刘永辉¹, 黄麒钧², 杜竞², 马洪奎², 许鸷宇²

1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川成都 610500;
2. 中国石油青海油田钻采工艺研究院, 甘肃敦煌 736202

收稿日期:2019-10-24 出版日期:2019-12-10 发布日期:2019-12-10
通讯作者: 刘永辉,E-mail:swpilyh@126.com
作者简介:刘永辉,1977年生,男,汉族,四川仁寿人,教授,博士生导师,主要从事采油采气工程领域的教学和科研工作。E-mail:swpilyh@126.com;黄麒钧,1986年生,男,汉族,吉林怀德人,工程师,主要从事采气工艺技术方面的研究工作。E-mail:hqjqh@petrochina.com.cn;杜竞,1985年生,男,汉族,河南淅川人,工程师,主要从事采气工艺技术方面的研究工作。E-mail:djqh@petrochina.com.cn;马洪奎,1986年生,男,汉族,青海湟中人,工程师,主要从事采气工艺技术方面的研究工作。E-mail:mhkqh@petrochina.com.cn;许鸷宇,1992年生,男,汉族,甘肃武威人,助理工程师,主要从事采气工艺技术方面的研究。E-mail:xuzyzcqh@petrochina.com.cn
基金资助:
国家科技重大专项（2016ZX05015-004）；中国石油天然气股份有限公司重大科技专项（2016E-01）；四川省科技计划重点研发项目（2018JZ0079）

Optimization of Solid Plunger's Structure

LIU Yonghui¹, HUANG Qijun², DU Jing², MA Hongkui², XU Zhiyu²

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. Qinghai Oilfield Drilling and Production Academy, PetroChina, Dunhuang, Gansu 736202, China

Received:2019-10-24 Online:2019-12-10 Published:2019-12-10

摘要/Abstract

摘要： 柱塞气举是页岩气压裂液返排的关键技术之一。为了进一步提高棒状柱塞举液密封效果，利用Fluent软件建立单一流道的二维几何模型，采用湍流模型模拟棒状柱塞运行时凹形槽内流场情况，优选槽型（正直角梯形、等腰梯形、反等腰梯形、反直角梯形和矩形），对比分析不同槽深和槽宽时的流场情况，并开展优化后棒状柱塞与常用衬垫式柱塞对比物理模拟实验。结果表明，柱塞运行时在凹槽中心有一个低速区，在该低速区会不断产生干扰流体正常流动的涡流，从而使整体流速降低以达到密封的效果；在对比槽型中，正直角梯形槽的密封效果最好；现场常用参数范围内，随槽宽、槽深增大，密封效果变强（槽宽20 mm、槽深6 mm时最优），且槽宽对柱塞密封性的影响大于槽深。物理模拟实验证实，相同条件下优化后的棒状柱塞在小气量情况下举液效果优于常用衬垫式柱塞。本研究结合CFD建立了可靠物理模型，且优化后棒状柱塞举液效果较好，对现场实际应用有指导作用。

关键词: 棒状柱塞, 举液, 密封, Fluent, 凹槽, 涡流

Abstract: Plunger lift has been the key technology of liquid flowback after fracking in shale gas reservoirs. In order to enhance the seal effect of fluid lift with solid plunger, the Fluent software was employed to set up the two-dimensional geometric model with a single flow channel, and turbulent flow model was adopted to simulate the flow field condition of groove with movement of solid plunger. Based on optimizing the shapes of groove (straight angle trapezoid groove, isosceles trapezoid groove, inverse isosceles trapezoid groove, inverse right angle trapezoid groove, and rectangular groove), this paper contrasts and analyzes the flow field condition with different groove width and depth, and then carries out the physical simulation experiment to contrast the dual pad plunger commonly and optimized solid plunger. Based on the above numerical simulations and experiments, we conclude that there is a low speed zone in the center of the groove when the plunger running, in which eddies appear constantly and interfere with the normal flow of the fluid. In that case, the flow rate is reduced to achieve the sealing effect. Through the comparison of groove type, it can be seen that the seal effect of trapezoidal groove with straight angle is the best. Accounting to the common situation on site, with wider and deeper groove, the sealing effect would be better (the performance of groove with the width as 20 mm and the depth as 6 mm is much better than the others'). Physical simulation experiment proved that under the same condition of low gas velocity, the liquid lifting effect of rod plunger is better than that of liner plunger. In this study, a reliable physical model was established in combination with CFD, and the optimized solid plunger had a good lift effect, which could guide the field application.

Key words: solid plunger, removing liquid, seal, Fluent, groove, turbulence

中图分类号:

TE355

刘永辉, 黄麒钧, 杜竞, 马洪奎, 许鸷宇. 棒状柱塞结构优化模拟[J]. 西南石油大学学报(自然科学版), 2019, 41(6): 181-186.

LIU Yonghui, HUANG Qijun, DU Jing, MA Hongkui, XU Zhiyu. Optimization of Solid Plunger's Structure[J]. 西南石油大学学报(自然科学版), 2019, 41(6): 181-186.

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棒状柱塞结构优化模拟

Optimization of Solid Plunger's Structure

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