基于Fluent的井下油水分离和润滑过程中新型润滑元件设计分析

doi:10.16085/j.issn.1000-6613.2020-2256

化工进展 ›› 2021, Vol. 40 ›› Issue (11): 5929-5938.DOI: 10.16085/j.issn.1000-6613.2020-2256

基于Fluent的井下油水分离和润滑过程中新型润滑元件设计分析

敬加强¹^,²(), 黄婉妮¹(), 宋学华³, 罗佳琪¹, 宋扬¹, 戢慧⁴, 罗遒汉¹, 王思汗⁵

^1.西南石油大学石油与天然气工程学院，四川成都 610500
^2.油气消防四川省重点实验室，四川成都 610500
^3.新疆油田公司工程技术研究院，新疆克拉玛依 834000
^4.新疆油田分公司吉庆油田作业区，新疆吉木萨尔 831700
^5.中国石油天然气管道工程有限公司，河北廊坊 065000

收稿日期:2020-11-11 修回日期:2021-04-29 出版日期:2021-11-05 发布日期:2021-11-19
通讯作者: 黄婉妮
作者简介:敬加强（1964—），男，教授，博士生导师，研究方向为非常规原油降黏减阻、复杂油气流动保障、油气储运工程安全。E-mail：jjq@swpu.edu.cn。
基金资助:
国家自然科学基金(51779212)

Design and analysis of novel lubricating element in downhole oil-water separation and lubrication based on Fluent

JING Jiaqiang¹^,²(), HUANG Wanni¹(), SONG Xuehua³, LUO Jiaqi¹, SONG Yang¹, JI Hui⁴, LUO Qiuhan¹, WANG Sihan⁵

^1.College of Petroleum & Gas Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China
^2.Oil and Gas Fire Protection Key Laboratory of Sichuan Province, Chengdu 610500, Sichuan, China
^3.Engineering Technology Research Institute, Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
^4.Jiqing Oil Operation Area of Xinjiang Oilfield Company, Jimusaer 831700, Xinjiang, China
^5.China Petroleum Pipeline Engineering Corporation, Langfang 065000, Hebei, China

Received:2020-11-11 Revised:2021-04-29 Online:2021-11-05 Published:2021-11-19
Contact: HUANG Wanni

摘要/Abstract

摘要：

为解决含水稠油采输时油水分离和降黏减阻的问题，采用Fluent软件对井下油水分离和润滑过程进行数值模拟，并设计出一种新型的润滑元件，使其能就地安装，形成高质量油水环状流，有效控制采出液的含水率，提高含水稠油井采收率，并降低后续原油处理成本。固定入口流速为0.6m/s，分流比为0.5，进行润滑元件结构的单因素分析。结果表明：流体在溢流口处径向速度极小，说明形成的油核几乎不存在偏心现象，轴向速度的存在有利于形成清晰的油水界面，从而利于形成高质量的油水环状流，经过元件的流体分离出部分水后轴向速度也得到了提升，有利于提高原油采收率。进行与仿真模拟相同工况下的室内实验，通过改变流速观察润滑元件的压降值与流型的变化情况。结果表明：合理的入口流速范围内，采用雷诺应力模型（RSM）与混合多相流模型（Mixture）计算模拟润滑元件内部流场情况具有较高的可信度。

关键词: 油水分离, 环状流, 稠油, 润滑减阻, 润滑元件

Abstract:

In order to solve the problems in oil-water separation and viscosity reduction during the production and transportation of heavy oil with free water, Fluent software was used to simulate the downhole oil-water separation and lubrication process. And a new type of lubricating element was designed to be installed on site to form a high-quality oil-water annular flow, which could effectively control the water cut of well stream, improve the recovery of heavy oil with free water, and reduce the cost of subsequent heavy oil processing. The inlet flow velocity was maintained at 0.6m/s, and the split ratio was maintained at 0.5. A single-factor analysis was carried out on the structure of the lubricating element. The results showed that the radial velocity of the fluid at the overflow was extremely small, indicating that the formed oil core had almost no eccentricity. The existence of axial velocity was conducive to the formation of a clear oil-water interface and high-quality oil-water core-annular flow. The axial velocity of the flow was increased after part of the water was separated by passing through the element, which was conducive to improving the heavy oil recovery. The indoor experiment under the same operating conditions as the simulation was carried out, and the changes of pressure drop and flow pattern of the lubricating element as the flow velocity were observed. The results showed that within a reasonable range of inlet flow velocity, the Reynolds stress model (RSM) and the mixture multiphase model (Mixture) could simulate the internal flow field of the lubricating element with high reliability.

Key words: oil-water separation, core-annular flow, heavy oil, drag reduction, lubricating element

中图分类号:

TE868

敬加强, 黄婉妮, 宋学华, 罗佳琪, 宋扬, 戢慧, 罗遒汉, 王思汗. 基于Fluent的井下油水分离和润滑过程中新型润滑元件设计分析[J]. 化工进展, 2021, 40(11): 5929-5938.

JING Jiaqiang, HUANG Wanni, SONG Xuehua, LUO Jiaqi, SONG Yang, JI Hui, LUO Qiuhan, WANG Sihan. Design and analysis of novel lubricating element in downhole oil-water separation and lubrication based on Fluent[J]. Chemical Industry and Engineering Progress, 2021, 40(11): 5929-5938.

图/表 15

图1 油水混合液流线

图2 导流叶片准线

图3 模型结构

图4 网格划分

表1 网格无关性验证

网格数目	压降/kPa
607799	22.323
761544	22.045
967372	22.043

图5 溢流口速度分布

图6 不同外出口角度的内部流场分布

图7 不同导流叶片厚度的内部流场分布

图8 不同中间棒直径的内部流场分布

图9 不同旋流腔长度的内部流场分布

图10 不同中心锥长度的内部流场分布

图11 实验流程1—储油罐；2—储水罐；3—球阀；4—过滤器；5—油泵；6—水泵；7—油流量计；8—水流量计；9—止回阀；10—三通；11—静态混合器；12—压差表；13—润滑元件；14—透明管段；15—分离罐；16—空气压缩机

表2 室内实验安排

编号	入口流量/m³·h^-1	输油量/m³·h^-1	输水量/m³·h^-1	白油流速/m·s^-1	纯水流速/m·s^-1	入口流速/m·s^-1
1	3.0	0.45	2.55	0.255	1.443	0.42
2	3.2	0.48	2.72	0.272	1.539	0.45
3	3.4	0.51	2.89	0.289	1.635	0.48
4	3.6	0.54	3.06	0.306	1.732	0.51
5	3.8	0.57	3.23	0.323	1.828	0.54
6	4.0	0.60	3.40	0.340	1.924	0.57
7	4.2	0.63	3.57	0.357	2.020	0.59
8	4.4	0.66	3.74	0.373	2.116	0.62
9	4.6	0.69	3.91	0.390	2.213	0.65
10	4.8	0.72	4.08	0.407	2.309	0.68

图12 压降-入口流速模拟值与实验值对比

图13 流型-入口流速模拟云图与实验图像对比

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基于Fluent的井下油水分离和润滑过程中新型润滑元件设计分析

Design and analysis of novel lubricating element in downhole oil-water separation and lubrication based on Fluent

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