Article(id=1320037384431973188, tenantId=1146029695717560320, journalId=1316781260334530699, issueId=1320037383882519364, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1005-0329.2025.12.002, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1740326400000, receivedDateStr=2025-02-24, revisedDate=1755360000000, revisedDateStr=2025-08-17, acceptedDate=null, acceptedDateStr=null, onlineDate=1792651037557, onlineDateStr=2026-10-22, pubDate=1767110400000, pubDateStr=2025-12-31, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792651037557, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792651037557, creator=13701087609, updateTime=1792651037557, updator=13701087609, issue=Issue{id=1320037383882519364, tenantId=1146029695717560320, journalId=1316781260334530699, year='2025', volume='53', issue='12', pageStart='1', pageEnd='118', issueExtLink='null', onlineDate='null', pubDate='1767110400000', pubDateStr='2025-12-31', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792651037426, creator='13701087609', updateTime=1792656182714, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1320058964839093145, tenantId=1146029695717560320, journalId=1316781260334530699, issueId=1320037383882519364, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1320058964839093146, tenantId=1146029695717560320, journalId=1316781260334530699, issueId=1320037383882519364, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=12, endPage=21, ext={EN=ArticleExt(id=1320037384624911173, articleId=1320037384431973188, tenantId=1146029695717560320, journalId=1316781260334530699, language=EN, title=Research on the oil‑water separation performance and adaptability of underground micro cyclones, columnId=null, journalTitle=Fluid Machinery, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To address the challenges of limited downhole space in single‑well injection‑production systems and the difficulty in efficiently separating small‑diameter oil droplets from oil‑water mixtures,miniature hydrocyclones with better separation performance for small oil droplets were selected.Combining computational fluid dynamics (CFD) numerical simulation and experimental methods,the effects of produced fluid physical parameters and operational parameters of miniature hydrocyclones on downhole oil‑water separation performance were analyzed,and their adaptability under different conditions was investigated.The results show that when the oil concentration in the produced fluid is set to 2%,5%,8%,10%,and 13%,the corresponding optimal overflow split ratios are 20%,23%,26%,28%,and 31%,respectively;when the oil density is 800 kg/m3,the miniature hydrocyclone demonstrates good separation performance across the oil concentration range of 2% to 13%;when the oil density is 850 kg/m3 and 900 kg/m3,the optimal adapted produced fluid oil concentration ranges for the miniature hydrocyclone are below 8% and below 5%,respectively.This study can provide references for the efficient application of miniature hydrocyclones in downhole oil‑water separation.

, authors=Yanfeng CAO1, Hao QIU1, Min WEN1, Zenghua MA2, Tiebing OUYANG2, Junwei ZHAO2, Zhiyuan QI1, authorsList=Yanfeng CAO, Hao QIU, Min WEN, Zenghua MA, Tiebing OUYANG, Junwei ZHAO, Zhiyuan QI, authorCompany=null, correspAuthors=Junwei ZHAO, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1320037388840186732, articleId=1320037384431973188, tenantId=1146029695717560320, journalId=1316781260334530699, language=CN, title=井下微型旋流器油水分离性能及适应性研究, columnId=1317484286475883136, journalTitle=流体机械, columnName=试验研究, runingTitle=null, highlight=null, articleAbstract=

针对同井注采系统中井下空间狭小及油水混合液内小粒径油滴难以高效分离的问题,选用对小粒径油滴分离效果更佳的微型旋流器,结合计算流体力学(CFD)数值模拟与试验方法,分析采出液物性参数和微型旋流器的操作参数对井下油水分离性能的影响规律,并探讨其在不同条件下的适应性。结果表明,当采出液含油浓度分别设定为2%,5%,8%,10%,13%时,对应的最佳溢流分流比分别为20%,23%,26%,28%,31%;当油品密度为800 kg/m3时,微型旋流器在含油浓度2%~13%范围内均具有较好的分离性能;当油品密度为850 kg/m3和900 kg/m3时,微型旋流器的最佳适应采出液含油浓度范围分别为低于8%和低于5%。研究可为微型旋流器在井下油水分离中的高效应用提供参考。

, authors=曹砚锋1, 邱浩1, 文敏1, 马增华2, 欧阳铁兵2, 赵军伟2, 齐致远1, authorsList=曹砚锋, 邱浩, 文敏, 马增华, 欧阳铁兵, 赵军伟, 齐致远, authorCompany=null, correspAuthors=赵军伟, authorNote=

曹砚锋(1977),男,高级工程师,主要从事海上油气田钻完井方案设计和技术研究工作,E-mail:。

, correspAuthorsNote=
赵军伟(1982),男,高级工程师,主要从事油气田地面工程工艺研究、油水分离及同井注采、油田人工举升技术方面的研究,通信地址:100028北京市朝阳区太阳宫南街6号院中海油大厦中海油研究总院有限责任公司,E-mail:。
, copyrightStatement=作者向本刊所投稿件一经本刊录用,则该论文的复制权、发行权、信息网络传播权、翻译权、汇编权等权利视为自动转让给本刊。本刊为国内各主要数据库收录期刊,本刊所发表的稿件将同时通过互联网进行网络出版或提供信息服务。, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=1Sn1tnh0QmDNHsTvhiYvPQ==, magXml=NGyO++GoCkG2Z+oPhhnUHQ==, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=CdrkrfGz5Y4/rqjnlCB8DQ==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=A024iBcccOQT3yPJu3F5nw==, mapNumber=null, fund=null)}, authors=[Author(id=1320037389297365876, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384431973188, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=caoyf@cnooc.com.cn, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1320037389377057654, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384431973188, authorId=1320037389297365876, language=EN, stringName=Yanfeng CAO, firstName=Yanfeng, middleName=null, lastName=CAO, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, address=1CNOOC Research Institute Ltd.,Beijing 100028,China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1320037389452555127, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384431973188, authorId=1320037389297365876, language=CN, stringName=曹砚锋, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, address=1中海油研究总院有限责任公司,北京 100028, bio={"content":"

曹砚锋(1977),男,高级工程师,主要从事海上油气田钻完井方案设计和技术研究工作,E-mail:。

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曹砚锋(1977),男,高级工程师,主要从事海上油气田钻完井方案设计和技术研究工作,E-mail:。

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journalId=1316781260334530699, articleId=1320037384431973188, language=EN, label=Tab.1, caption=

Main structural parameters of miniature hydrocyclone

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项目D1D2D3D4H1H2H3
数值258.5146.52525225
), ArticleFig(id=1320037395798537159, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384431973188, language=CN, label=表1, caption=

微型旋流器主要结构参数

, figureFileSmall=null, figureFileBig=null, tableContent=
项目D1D2D3D4H1H2H3
数值258.5146.52525225
), ArticleFig(id=1320037395882423241, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384431973188, language=EN, label=Tab.2, caption=

Numerical simulation conditions setting

, figureFileSmall=null, figureFileBig=null, tableContent=
项目入口速度/(m·s-1)水相密度/(kg·m-3)水相黏度/(mPa·s)油品密度/(kg·m-3)油相黏度/(Pa·s)收敛精度
数值0.88998.21.003800~9801.0610-6
), ArticleFig(id=1320037395949532106, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384431973188, language=CN, label=表2, caption=

数值模拟条件设置

, figureFileSmall=null, figureFileBig=null, tableContent=
项目入口速度/(m·s-1)水相密度/(kg·m-3)水相黏度/(mPa·s)油品密度/(kg·m-3)油相黏度/(Pa·s)收敛精度
数值0.88998.21.003800~9801.0610-6
), ArticleFig(id=1320037396167635915, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384431973188, language=EN, label=Tab.3, caption=

Adaptability scheme of overflow split ratio and numerical simulation results

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项目含油浓度C/%溢流分流比FU/%分离效率EZ/%压力损失PU/MPa
方案121096.340.161
1597.970.173
2098.430.186
2598.590.201
3098.660.217
方案251396.480.231
1898.570.249
2399.060.268
2899.240.289
3399.300.312
方案381695.750.297
2198.710.319
2699.330.342
3199.530.368
3699.610.395
方案4101894.670.340
2398.720.364
2899.320.389
3399.730.418
3899.660.447
方案5132192.120.401
2697.940.430
3199.250.459
3699.660.490
4199.800.523
), ArticleFig(id=1320037396234744780, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384431973188, language=CN, label=表3, caption=

溢流分流比适应性方案及数值模拟结果

, figureFileSmall=null, figureFileBig=null, tableContent=
项目含油浓度C/%溢流分流比FU/%分离效率EZ/%压力损失PU/MPa
方案121096.340.161
1597.970.173
2098.430.186
2598.590.201
3098.660.217
方案251396.480.231
1898.570.249
2399.060.268
2899.240.289
3399.300.312
方案381695.750.297
2198.710.319
2699.330.342
3199.530.368
3699.610.395
方案4101894.670.340
2398.720.364
2899.320.389
3399.730.418
3899.660.447
方案5132192.120.401
2697.940.430
3199.250.459
3699.660.490
4199.800.523
), ArticleFig(id=1320037396301853645, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384431973188, language=EN, label=Tab.4, caption=

Adaptability analysis scheme design and simulation results of oil concentration on oil density

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项目含油浓度C/%油品密度ρ/(kg·m-3)分离效率EZ/%压力损失PU/MPa
方案1280098.610.204
85098.400.200
90094.000.195
95072.740.184
98046.300.175
方案2580099.190.281
85098.100.276
90089.470.267
95061.280.251
98040.550.241
方案3880099.330.342
85096.640.338
90079.900.324
95053.960.310
98037.640.300
方案41080099.280.380
85093.400.373
90073.500.358
95050.570.345
98036.170.336
方案51380098.530.430
85084.500.419
90065.730.408
95046.600.397
98034.690.389
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含油浓度对油品密度适应性分析方案设计及模拟结果

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项目含油浓度C/%油品密度ρ/(kg·m-3)分离效率EZ/%压力损失PU/MPa
方案1280098.610.204
85098.400.200
90094.000.195
95072.740.184
98046.300.175
方案2580099.190.281
85098.100.276
90089.470.267
95061.280.251
98040.550.241
方案3880099.330.342
85096.640.338
90079.900.324
95053.960.310
98037.640.300
方案41080099.280.380
85093.400.373
90073.500.358
95050.570.345
98036.170.336
方案51380098.530.430
85084.500.419
90065.730.408
95046.600.397
98034.690.389
), ArticleFig(id=1320037396448654287, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384431973188, language=EN, label=Tab.5, caption=

Test medium parameters

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项目分离介质密度/(kg·m-3)
离散相GL-5 85W-90重负荷型齿轮油900
离散相工业白油1850
离散相工业白油2800
连续相水1 000
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试验介质参数

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项目分离介质密度/(kg·m-3)
离散相GL-5 85W-90重负荷型齿轮油900
离散相工业白油1850
离散相工业白油2800
连续相水1 000
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井下微型旋流器油水分离性能及适应性研究
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曹砚锋 1 , 邱浩 1 , 文敏 1 , 马增华 2 , 欧阳铁兵 2 , 赵军伟 2 , 齐致远 1
流体机械 | 试验研究 2025,53(12): 12-21
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流体机械 |试验研究 2025 , 53 (12) : 12 -21
井下微型旋流器油水分离性能及适应性研究
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曹砚锋(1977),男,高级工程师,主要从事海上油气田钻完井方案设计和技术研究工作,E-mail:。

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曹砚锋1 , 邱浩1, 文敏1, 马增华2, 欧阳铁兵2, 赵军伟2 , 齐致远1
作者信息
  • 1中海油研究总院有限责任公司,北京 100028
  • 2中海油田服务股份有限公司,天津 300459
通讯作者:
赵军伟(1982),男,高级工程师,主要从事油气田地面工程工艺研究、油水分离及同井注采、油田人工举升技术方面的研究,通信地址:100028北京市朝阳区太阳宫南街6号院中海油大厦中海油研究总院有限责任公司,E-mail:。
作者简介:

曹砚锋(1977),男,高级工程师,主要从事海上油气田钻完井方案设计和技术研究工作,E-mail:。

Research on the oil‑water separation performance and adaptability of underground micro cyclones
Yanfeng CAO1 , Hao QIU1, Min WEN1, Zenghua MA2, Tiebing OUYANG2, Junwei ZHAO2 , Zhiyuan QI1
Affiliations
  • 1CNOOC Research Institute Ltd.,Beijing 100028,China
  • 2China Oilfield Services Limited,Tianjin 300459,China
出版时间: 2025-12-31 doi: 10.3969/j.issn.1005-0329.2025.12.002
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针对同井注采系统中井下空间狭小及油水混合液内小粒径油滴难以高效分离的问题,选用对小粒径油滴分离效果更佳的微型旋流器,结合计算流体力学(CFD)数值模拟与试验方法,分析采出液物性参数和微型旋流器的操作参数对井下油水分离性能的影响规律,并探讨其在不同条件下的适应性。结果表明,当采出液含油浓度分别设定为2%,5%,8%,10%,13%时,对应的最佳溢流分流比分别为20%,23%,26%,28%,31%;当油品密度为800 kg/m3时,微型旋流器在含油浓度2%~13%范围内均具有较好的分离性能;当油品密度为850 kg/m3和900 kg/m3时,微型旋流器的最佳适应采出液含油浓度范围分别为低于8%和低于5%。研究可为微型旋流器在井下油水分离中的高效应用提供参考。

微型旋流器  /  操作参数  /  物性参数  /  适应性  /  分离性能

To address the challenges of limited downhole space in single‑well injection‑production systems and the difficulty in efficiently separating small‑diameter oil droplets from oil‑water mixtures,miniature hydrocyclones with better separation performance for small oil droplets were selected.Combining computational fluid dynamics (CFD) numerical simulation and experimental methods,the effects of produced fluid physical parameters and operational parameters of miniature hydrocyclones on downhole oil‑water separation performance were analyzed,and their adaptability under different conditions was investigated.The results show that when the oil concentration in the produced fluid is set to 2%,5%,8%,10%,and 13%,the corresponding optimal overflow split ratios are 20%,23%,26%,28%,and 31%,respectively;when the oil density is 800 kg/m3,the miniature hydrocyclone demonstrates good separation performance across the oil concentration range of 2% to 13%;when the oil density is 850 kg/m3 and 900 kg/m3,the optimal adapted produced fluid oil concentration ranges for the miniature hydrocyclone are below 8% and below 5%,respectively.This study can provide references for the efficient application of miniature hydrocyclones in downhole oil‑water separation.

miniature hydrocyclone  /  operational parameters  /  physical parameters  /  adaptability  /  separation performance
曹砚锋, 邱浩, 文敏, 马增华, 欧阳铁兵, 赵军伟, 齐致远. 井下微型旋流器油水分离性能及适应性研究. 流体机械, 2025 , 53 (12) : 12 -21 . DOI: 10.3969/j.issn.1005-0329.2025.12.002
Yanfeng CAO, Hao QIU, Min WEN, Zenghua MA, Tiebing OUYANG, Junwei ZHAO, Zhiyuan QI. Research on the oil‑water separation performance and adaptability of underground micro cyclones[J]. Fluid Machinery, 2025 , 53 (12) : 12 -21 . DOI: 10.3969/j.issn.1005-0329.2025.12.002
我国许多油藏已进入高含水或特高含水期,这给油田开采带来了巨大挑战,大幅增加了开采难度。油田含水率的逐渐上升意味着采出液中的含油浓度逐渐降低,不仅提高了开采成本,同时也降低了开采效率。当前,面对高含水期和特高含水期带来的挑战,油田开采领域需采取有效的解决方案[1]。为克服这一问题,井下油水分离及同井注采技术得以应用。该技术颠覆了现有开发模式,有效解决了“大量地下水被采出”与“注入水无效循环”两大难题,被称为四次采油技术。这项技术的应用,对保障我国石油能源供给战略、实现油田稳定生产及节能降耗均具有重要意义[2-3]。
在众多井下油水分离设备中,旋流器因其结构简单、分离高效和易于维护的优点而备受青睐[4]。目前,为提升油水分离效率,相关学者在油水分离领域展开了深入研究,探讨了操作参数、结构参数以及介质物性参数对油水分离性能的影响规律,并通过优化这些参数来实现更高效的油水分离效果[5-12]。杨兆铭等[13]针对特高含水期油田在稠油集输方面进行了分析,指出稠油在柱状旋流器内的分离特性与其他油品存在差异。分散相粒径对底流口含油率有显著影响,但对压力损失影响较小。油品密度和黏度对底流口含油率的影响不同,密度越小越有利于分离;当油品密度高于900 kg/m3时,在油水分离工艺的弱旋流场作用下几乎无法达到分离效果;黏度的影响与密度不同,存在一个使分离效果最优的黏度和密度范围。韩帅[14]在辽河油田针对稠油污水进行了旋流分离技术的应用研究,某脱水站未使用破乳药剂,将分流比调整为10.87%,结果显示,经旋流分离后,污水的最佳除油效率仅为59.56%,明显低于常规旋流器的分离效率。YANG等[15]采用数值模拟研究了油滴特征参数对旋流除油装置分离效率的影响,最终得出液滴尺寸对分离效率有正向影响,含油浓度对效率有负向影响,油滴速度在一定范围内与效率成正比。NIAZI等[16]研究了连续相温度对旋流器总效率和分流比的影响,结果显示,随着温度升高,总效率增加,而分流比则呈相反趋势。TAVARES等[17]基于试验数据与理论推导,构建了考虑黏度对旋流器分离性能影响的数学模型,结果表明,随着连续相黏度的上升,流体的运动速度会相应减缓,导致流体在旋流器内无法获得足够的离心力,从而使得整体分离效率下降。
由于油田井筒内部空间有限,对油水分离器的尺寸设计限制较大;且同井注采工艺系统结构复杂,存在油水混合液中微小油滴难以分离的问题。微型旋流器(尤其是主直径小于30 mm的类型)对微小油滴的分离能力强、效率高[18],但目前针对同井注采系统中微型旋流器关键参数与性能研究的相关报道较为鲜见。这些关键参数在特定工况下,会成为提高油水分离效率的关键因素,在某些情况下甚至可能对分离效率起到决定性作用。此外,微型旋流器在井下工作时,无法随含油浓度的变化轻易调整溢流分流比,因此为确保其在关键应用中达到最优性能,必须全面考虑并精确调控这些参数。
综上所述,本文旨在通过CFD数值模拟,确定井下微型旋流器在不同含油浓度下的最佳溢流分流比,并对井下混合液在不同油品密度下的含油浓度适应性展开分析;通过深入研究操作参数与物性参数对微型旋流器性能的影响,揭示不同参数对井下微型旋流器分离性能的作用规律。
与常规旋流器相比,微型旋流器不仅具备紧凑的结构设计,适配井筒空间限制,还可高效处理微小油滴;其独特的旋流分离机制,显著提升了油水分离效率。油滴在旋流器中的受力情况如图1所示,其所受径向力主要包括离心力FC、径向压力梯度力FP、连续水相对油滴施加的斯托克斯阻力FS及油滴旋转产生的马格纳斯力FM。根据式(1)可求得微油滴在流场中的径向合力F∑:
F∑=FP-FC-FS±FM
在微油滴受到的径向力中,径向压力梯度力FP和离心力FC占据主导作用,因此两者的差值ΔF决定着微油滴朝向分离器轴心的运动速度:
ΔF=FP-FC=πx3vt26r(ρw-ρo)
式中,ΔF为油滴所受合力,N;x表示油滴粒径,mm;vt为切向速度,m/s;r为距离旋流器轴心的径向距离,mm;ρw,ρo分别表示水相和油相的密度,kg/m3。
根据式(2),在相同的入口速度条件下,假设常规旋流器和微型旋流器中待分离的油滴粒径,以及油滴所在位置处的切向速度均相同,由于微型旋流器的径向空间小于常规旋流器,油滴在微型旋流器中所受到的径向合力更大,更容易运动到旋流器内壁附近而被成功分离。同时,考虑到分离精度及井下可能存在的堵塞问题,文中选用主直径为25 mm的微型旋流器展开研究。
在实际应用中,为满足井下大排量采出需求,微型旋流器需采用多级并联形式工作。由于该形式下每个微型旋流器的分离性能一致,因此可选取单个旋流器作为研究对象。井下微型旋流器的结构与工作原理分别如图2、图3所示,其主要结构参数见表1。当油水混合物从径向入口流入旋流器后,内部螺旋流道会引导混合液进行高速切向旋转;在此过程中,受离心力作用,密度较大的水相被推向旋流器边壁,最终经底流口排出;而密度较小的油相则在旋流器中心区域汇聚,并逐渐在溢流管下方聚集,最终通过溢流口排出,从而实现油水混合物的有效分离。
采用ICEM软件对微型旋流器流体域进行网格划分时,选用六面体结构性网格作为网格类型,其在稳定性与收敛性方面具有显著优势[19-20]。为研究网格数量对模拟结果的影响,文中以分离效率变化为主要考察指标,并开展网格无关性检验。微型旋流器流体域网格如图4(a)所示,试验共设计5种不同数量的网格,其分离效率变化趋势如图4(b)所示。可以看出,当网格数量增加至357 880时,分离效率变化趋于稳定。因此,为在保证模拟精度的同时降低计算成本,最终确定网格数量为357 880。
利用ANSYS Fluent进行数值模拟,计算选用双精度压力基求解器,采用隐式稳态求解。多相流模型选用Mixture模型,该模型可用于模拟微型旋流器内油水两相介质的流动,能提供较为准确的模拟结果,同时具有成本较低、节省运算资源等优点[21]。湍流模型选择雷诺应力模型(Reynolds stress model,RSM),该模型对旋转流场结果的预测具有较高精度。模拟条件设置见表2。
壁面边界条件设置为无滑移、不可渗透。求解器设置方面,压力-速度耦合方式采用SIMPLEC,压力离散格式采用PRESTO!,动量离散格式选用二阶迎风。入口采用速度入口边界条件,出口设为自由出口。
溢流分流比(溢流流量与入口流量的比值)是影响旋流器分离性能的主要因素。在含油浓度C分别为2%,5%,8%,10%,13%的条件下,对井下微型旋流器开展溢流分流比的适应性研究。采用上述数值模拟方法,以分离效率EZ及溢流压力损失PU为监测指标,探究每种含油浓度下分离效率达到较优水平且压力损失较低时,对应的最佳溢流分流比。考虑到入口含油浓度增加时,需要更大的溢流分流比才能使油相排出,因此根据含油浓度的不同,对各浓度条件下的初始溢流分流比进行了相应的上调。表3示出方案设计和数值模拟结果。
在表3中5种含油浓度条件下,溢流分流比对分离效率和压力损失的影响,如图5所示。可以看出,分离效率随分流比增加而提升,但提升幅度逐渐减缓,最终趋于平缓;与此同时,溢流压力损失则近似呈线性增长。这是由于随着溢流分流比的逐渐增大,溢流口流量增加,油相介质向溢流口排出的速率加快,此时大多数油相介质基本可以从溢流口流出,但单位时间内进入旋流器的两相介质总流量保持不变,故分离效率逐渐增大。当分流比逐渐增加到一定值后,油相几乎完全由溢流口流出,故分离效率的增加幅度会逐渐减小。压力损失增大的原因是溢流口直径大小一定,随着溢流分流比增加,溢流口流量增加导致。这表明通过增大溢流分流比可以在一定程度上改善分离性能,但同时需考虑压力损失增大带来的不利影响。
由表3和图5可知,当含油浓度为13%,溢流分流比为21%时,分离效率为92.12%,压力损失为0.401 MPa;当分流比增大到26%时,分离效率高达97.94%,提升了6.32%,同时压力损失增加了0.029 MPa;溢流分流比继续以5%的间隔增大,此时分离效率提升幅度逐渐降低,溢流压力损失上升幅度逐渐增大。这表明在高含油浓度条件下,分流比已不再适合继续增大,过大的分流比会使更多的水相从溢流口排出,从而对分离效率产生反作用。
在不同含油浓度条件下,分离效率和压力损失的变化规律基本相同,这表明数值模拟方法具有较好的准确性。
为研究溢流分流比在低含油与高含油条件下对微型旋流器分离性能的影响,对表3中2种含油浓度条件下的油相分布云图进行分析(含油浓度2%属于低含油浓度,13%属于高含油浓度)。图6示出含油浓度2%时,不同溢流分流比下的油相分布云图。可以看出,随着分流比的增大,油相逐渐向溢流口迁移,使更多油相从溢流口排出;当分流比达到20%及以上时,底流含油量接近0。
图7示出含油浓度13%时,不同溢流分流比下的油相分布云图。
从图可以看出,当最小溢流分流比为21%时,微型旋流器内部相较于低含油条件下产生的油相更为明显。这是因为当混合液含油量高时,较小的分流比使分离出的油相不能完全从溢流口排出,油体会在底流口附近积聚。当溢流分流比逐渐增大时,油相在溢流口附近不断向上聚集,此时油相更容易从溢流口排出。因此,高含油条件下微型旋流器需要更大的溢流分流比才能使分离出的油相从溢流口排出。
当含油浓度在2%~13%范围内时,为满足良好的经济适用性并达到较好的分离性能,将溢流分流比设定为26%。此时旋流器无论在哪种含油浓度下,均可达到较好的分离性能。为验证这一结论,采用相同的数值模拟方法进行模拟验证,结果如图8所示。
从图可以看出,在溢流分流比保持26%不变的条件下,当混合液含油浓度在10%及以下时,分离效率在98%以上;当混合液含油浓度高于10%但低于13%时,分离效率虽有所降低,但仍接近98%。此时微型旋流器仍可保持良好的分离性能,并且压力损失可控制在0.43 MPa以下。因此可以得出,当溢流分流比设定在26%时,对不同含油浓度的混合液适应性较好,能够在保证良好分离性能的同时满足经济适用性要求。
旋流器的分离原理是利用多相介质间的密度差异来实现的,因此油品密度是影响旋流分离的关键因素。选取适应性最好的溢流分流比26%,在含油浓度分别为2%,5%,8%,10%,13%时,对微型旋流器开展油品密度的适应性研究,分析不同含油浓度对油品密度的适应范围。采用上述数值模拟计算方法,以分离效率EZ和溢流压力损失PU作为监测指标。表4示出含油浓度对油品密度适应性分析的方案设计及模拟结果。
5种不同含油浓度下,不同油品密度对分离效率和压力损失的变化规律如图9所示。结合表4和图9可知,油品密度对分离性能具有显著影响。
随着油品密度增加,油水两相密度差减小,导致分离效率与压力损失均呈现下降趋势。该现象在低含油和高含油浓度下均成立,但在高含油浓度下,效率随密度增加,下降更为急剧。当含油浓度为13%时,密度从800 kg/m3增至980 kg/m3,分离效率从98.53%的峰值骤降至34.69%。
为研究油品密度在低含油与高含油浓度下对微型旋流器分离性能的影响,对表4中2种含油浓度条件下的油相分布云图进行分析(含油浓度2%属于低含油浓度,13%属于高含油浓度)。图10示出混合液含油浓度为2%时,不同油品密度下的油相分布云图。
从图可以看出,随着油品密度的增大,微型旋流器内部产生的油核逐渐向底流口方向移动。当油品密度达到900 kg/m3以上时,分离出的油相越来越靠近微型旋流器壁面。这是因为当油品密度接近水的密度时,微型旋流器产生的高速离心力很难将密度较大的油相分离出来,这验证了油品密度较大时分离性能降低的原因。
图11示出混合液含油浓度为13%时,不同油品密度下的油相分布云图。可以看出,随着油品密度的增大,微型旋流器溢流管附近的油相体积分数逐渐降低,这说明分离效率呈逐级递减的趋势。观察油品密度为800 kg/m3时,微型旋流器产生的油核基本靠近微型旋流器上部。当油品密度以50 kg/m3的间隔继续增加时,可以看出微型旋流器产生的油核不断向下迁移,因此更多的油相从底流口排出。当油品密度大于950 kg/m3时,油品密度更接近于水相,产生的油核将向微型旋流器壁面扩散,油相很难从溢流口排出,因此微型旋流器难以实现油相分离。
由表4和图9可知,当油品密度为800 kg/m3时,随混合液含油浓度增大,微型旋流器分离效率呈先升高后降低趋势,其中含油浓度13%时分离效率达98.53%;且此密度下,无论混合液为低含油浓度还是高含油浓度,旋流器均表现出较好分离性能。当油品密度增至980 kg/m3时,分离效率均低于50%,适应性较差。当油品密度小于等于900 kg/m3时,混合液含油浓度为2%的工况下,分离效率能保持在94%以上,且适应性较好。当油品密度小于等于850 kg/m3时,仅混合液含油浓度为2%,5%和8%时,旋流器才具有良好分离性能。而当混合液含油浓度达到10%以上(属于高含油)时,若需旋流器保持良好分离性能,油品密度需控制在800 kg/m3左右。
微型旋流器主要用于油水两相混合介质的分离。混合相主要由油和水组成,连续相介质为水,离散相介质为GL-5 85W-90重负荷型齿轮油和2种不同密度的工业白油,其参数值见表5。
室内试验的配套设施主要包括动力单元、计量单元、化验分析单元及微型旋流器样机,工艺流程如图12所示。采用螺杆泵及柱塞泵作为动力装置,通过调节变频器的频率来控制电机的转速,从而实现流量的控制。计量单元由流量计和压力表组成,试验中选用红外分光测油仪对含油浓度进行化验分析。
水箱中的油水混合液经螺杆泵加速后,进入微型旋流器内进行离心分离。分离后,大部分油相从顶部依次经溢流流量计、溢流排液阀进入废液池;大部分水相则从底部依次经底流流量计、底流排液阀进入废液缸。图13示出室内试验用微型旋流器样机。
在分离系统中加入密度为800,850,900 kg/m3的油,入口流量为1.6 m3/h,溢流分流比设置为35%。调节油泵控制含油浓度分别为2%,5%,8%,10%和13%,进行5组试验。系统稳定运行后,取样并进行化验分析,对比不同含油浓度下的分离效果。图14示出油相密度为900 kg/m3时,入口、溢流和底流的样液图。
图15示出不同混合液含油浓度下,3种不同密度油相对应的底流含油浓度变化趋势。
由图15可知,在相同条件下,当油品密度为800 kg/m3时,底流含油浓度先缓慢上升后略有下降,整体保持相对稳定;当油品密度增至850 kg/m3时,底流含油浓度随入口含油体积分数的增加呈逐渐上升趋势;尤为显著的是,在高含油浓度条件下,密度为900 kg/m3的高密度油品,其底流含油浓度的增长态势更为突出。由此可见,随着油品密度的增大,底流含油浓度逐渐升高,表明分离效率逐步降低;同时,随着入口含油浓度的增加,底流含油浓度同样呈上升趋势,分离效率也随之下降。该试验结果的变化规律与模拟结果一致。
图16示出不同油品密度下的样液示意图。试验中保持处理量与分流比不变,通过改变油品密度,探究不同密度油品对分离性能的影响规律。可以看出,微型旋流器对800~900 kg/m3范围内的油品均具备一定分离效果;其中,当油品密度为800 kg/m3时,底流样液最为清澈,表明该条件下分离效果最优。
分流比是影响微型旋流器效率的关键因素。向分离系统加入水和密度为800 kg/m3的油,入口流量为1.6 m3/h,含油浓度为5%,溢流分流比分别设定为20%,25%,35%,40%,45%。试验样液如图17所示。
图18示出不同分流比条件下,模拟与试验的分离效率变化曲线。可以看出,分流比较小时,进入分离装置的流体更多流向底流口,溢流口流量相对较小;随着分流比逐步增大,更多流体被分配至溢流口,使得溢流流量增加,更多油相得以从溢流口排出,分离效率在此阶段显著提升。模拟得出的分离效率高于试验结果,这是由于模拟过程采用了理想边界条件所致。整体而言,随着分流比的增大,模拟与试验的分离效率均呈上升趋势,二者变化规律保持一致。
(1)在固定其他操作参数的条件下,微型旋流器的分离效率在一定范围内随油品密度的增大而降低,随入口含油浓度的升高而减小,随溢流分流比的增大而提升。
(2)针对采出液含油浓度为2%,5%,8%,10%和13%的工况,其对应的最佳溢流分流比分别为20%,23%,26%,28%与31%。将溢流分流比统一设定为26%,可在全浓度范围内实现分离效率与压力损失的良好平衡,具备较好的工程适应性。
(3)当油品密度为800 kg/m3时,微型旋流器在低含油浓度(2%)至高含油浓度(13%)区间内均表现出优良的分离性能。随着油品密度升高,其适宜处理的含油浓度范围变窄。

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doi: 10.3969/j.issn.1005-0329.2025.12.002
  • 接收时间:2025-02-24
  • 首发时间:2026-10-22
  • 出版时间:2025-12-31
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  • 收稿日期:2025-02-24
  • 修回日期:2025-08-17
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    1中海油研究总院有限责任公司,北京 100028
    2中海油田服务股份有限公司,天津 300459

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赵军伟(1982),男,高级工程师,主要从事油气田地面工程工艺研究、油水分离及同井注采、油田人工举升技术方面的研究,通信地址:100028北京市朝阳区太阳宫南街6号院中海油大厦中海油研究总院有限责任公司,E-mail:。
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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