{"title":"案例研究:伊朗未饱和油藏不相溶气体注入深度对采收率的影响","authors":"Sepideh Zobeidi","doi":"10.1615/jpormedia.2024052247","DOIUrl":null,"url":null,"abstract":"In saturated oil reservoirs, the pressure of the reservoir is gradually reduced with production of oil, and this ultimately leads to gas production of the reservoir and formation of a gas cap. After the period of natural depletion from oil reservoirs, it is necessary to use secondary and then tertiary methods of EOR. One of the most common methods (if gas is available) is gas injection. By injecting gas, while pressure maintenance and re-pressuring to initial pressure of the reservoir, the recovery factor increases. This increase in recovery factor mainly occurs due to maintenance or increase in pressure and decrease in interfacial tension (IFT) and viscosity.\nIn Iran, except in one of the fields where gas injection is done with the aim of miscible gas injection, other gas injection projects are done with the aim of pressure maintenance. In these projects, the proper place for injection is not taken into consideration and the gas is done in the highest part of the reservoir, the question was raised at what depth the gas injection should be done to be optimal. Therefore, one of the reservoirs in the south of Iran was selected and a feasibility study was conducted with the aim of determining the most suitable injection point.\nIn this study, the issue of the appropriate place for gas injection from the point of view of whether it is in the gas cap, in the middle of the production column, or at near the water/oil contact has been investigated and the results have been presented. Also it is approved that the injection in saturated reservoir has more recovery factor than under saturated reservoir. Finally, injection near water/oil contact is known as the preferred option.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":"160 1","pages":""},"PeriodicalIF":2.5000,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A Case Study: Depth Impact on Recovery of Immiscible Gas Injection in an Iranian Undersaturated Oil Reservoir\",\"authors\":\"Sepideh Zobeidi\",\"doi\":\"10.1615/jpormedia.2024052247\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In saturated oil reservoirs, the pressure of the reservoir is gradually reduced with production of oil, and this ultimately leads to gas production of the reservoir and formation of a gas cap. After the period of natural depletion from oil reservoirs, it is necessary to use secondary and then tertiary methods of EOR. One of the most common methods (if gas is available) is gas injection. By injecting gas, while pressure maintenance and re-pressuring to initial pressure of the reservoir, the recovery factor increases. This increase in recovery factor mainly occurs due to maintenance or increase in pressure and decrease in interfacial tension (IFT) and viscosity.\\nIn Iran, except in one of the fields where gas injection is done with the aim of miscible gas injection, other gas injection projects are done with the aim of pressure maintenance. In these projects, the proper place for injection is not taken into consideration and the gas is done in the highest part of the reservoir, the question was raised at what depth the gas injection should be done to be optimal. Therefore, one of the reservoirs in the south of Iran was selected and a feasibility study was conducted with the aim of determining the most suitable injection point.\\nIn this study, the issue of the appropriate place for gas injection from the point of view of whether it is in the gas cap, in the middle of the production column, or at near the water/oil contact has been investigated and the results have been presented. Also it is approved that the injection in saturated reservoir has more recovery factor than under saturated reservoir. Finally, injection near water/oil contact is known as the preferred option.\",\"PeriodicalId\":50082,\"journal\":{\"name\":\"Journal of Porous Media\",\"volume\":\"160 1\",\"pages\":\"\"},\"PeriodicalIF\":2.5000,\"publicationDate\":\"2024-05-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Porous Media\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1615/jpormedia.2024052247\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Porous Media","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1615/jpormedia.2024052247","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
A Case Study: Depth Impact on Recovery of Immiscible Gas Injection in an Iranian Undersaturated Oil Reservoir
In saturated oil reservoirs, the pressure of the reservoir is gradually reduced with production of oil, and this ultimately leads to gas production of the reservoir and formation of a gas cap. After the period of natural depletion from oil reservoirs, it is necessary to use secondary and then tertiary methods of EOR. One of the most common methods (if gas is available) is gas injection. By injecting gas, while pressure maintenance and re-pressuring to initial pressure of the reservoir, the recovery factor increases. This increase in recovery factor mainly occurs due to maintenance or increase in pressure and decrease in interfacial tension (IFT) and viscosity.
In Iran, except in one of the fields where gas injection is done with the aim of miscible gas injection, other gas injection projects are done with the aim of pressure maintenance. In these projects, the proper place for injection is not taken into consideration and the gas is done in the highest part of the reservoir, the question was raised at what depth the gas injection should be done to be optimal. Therefore, one of the reservoirs in the south of Iran was selected and a feasibility study was conducted with the aim of determining the most suitable injection point.
In this study, the issue of the appropriate place for gas injection from the point of view of whether it is in the gas cap, in the middle of the production column, or at near the water/oil contact has been investigated and the results have been presented. Also it is approved that the injection in saturated reservoir has more recovery factor than under saturated reservoir. Finally, injection near water/oil contact is known as the preferred option.
期刊介绍:
The Journal of Porous Media publishes original full-length research articles (and technical notes) in a wide variety of areas related to porous media studies, such as mathematical modeling, numerical and experimental techniques, industrial and environmental heat and mass transfer, conduction, convection, radiation, particle transport and capillary effects, reactive flows, deformable porous media, biomedical applications, and mechanics of the porous substrate. Emphasis will be given to manuscripts that present novel findings pertinent to these areas. The journal will also consider publication of state-of-the-art reviews. Manuscripts applying known methods to previously solved problems or providing results in the absence of scientific motivation or application will not be accepted. Submitted articles should contribute to the understanding of specific scientific problems or to solution techniques that are useful in applications. Papers that link theory with computational practice to provide insight into the processes are welcome.