Multi-Fracture Stimulation Techniques Make Better Wells in Ultra-Low Permeability Oil Reservoirs

Abstract

PreviousNext No AccessUnconventional Resources Technology Conference, Denver, Colorado, 12-14 August 2013Multi-Fracture Stimulation Techniques Make Better Wells in Ultra-Low Permeability Oil ReservoirsAuthors: Yanrong CHANGHongjun LUBaochun CHENZhen-ning JIChengwang WANGYin QIJianshan LIXianfei DUGuiqin YINYanrong CHANGPetroChina Changqing Oilfield CompanySearch for more papers by this author, Hongjun LUPetroChina Changqing Oilfield CompanySearch for more papers by this author, Baochun CHENPetroChina Changqing Oilfield CompanySearch for more papers by this author, Zhen-ning JIPetroChina Changqing Oilfield CompanySearch for more papers by this author, Chengwang WANGPetroChina Changqing Oilfield CompanySearch for more papers by this author, Yin QIPetroChina Changqing Oilfield CompanySearch for more papers by this author, Jianshan LIPetroChina Changqing Oilfield CompanySearch for more papers by this author, Xianfei DUPetroChina Changqing Oilfield CompanySearch for more papers by this author, and Guiqin YINPetroChina Changqing Oilfield CompanySearch for more papers by this authorhttps://doi.org/10.1190/urtec2013-277 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract URTeC 1578201 Ultra-low permeability reservoirs in the Changqing Oilfield exhibit low reservoir quality (porosity of 9-12%), low reservoir permeability (0.05 to 0.3 mD) and low reservoir pressure (about 75 to 85% of normal hydrostatic pressure). Due to these reservoir conditions and restrictions in well spacing and waterflooding patterns, it is not effective to achieve economic production by simply increasing fracture lengths using conventional stimulation techniques. An operator in the Changqing Oilfield has conducted theoretical studies and pilot field trials, integrated reservoir characteristics into fracture design considerations, and developed three unique stimulation techniques to tackle these reservoirs. The core idea of these techniques is to achieve commercial oil production by creating multiple/complex fractures and hence increasing reservoir contact area and drainage volume. The first technique is to employ oriented perforating to induce multiple hydraulic fractures for reservoirs with low deviatoric stresses. The second technique is to perform multiple treatments using particulate diversion to create multiple/complex fractures in reservoirs with natural fractures. The third technique is to perform multi-stage treatments in deviated wells to connected more reservoir volumes. Diagnostic and analysis techniques, such as net pressure matching, radioactive tracer, DSI logging and microseismic monitoring, on selected pilot wells, have confirmed that multiple fractures have been created and reservoir drainage volume has been increased using these multi-fracture stimulation techniques. From 2009 through 2012, 216 wells in ultra-low permeability reservoirs were completed using these stimulation techniques. Average oil production of these wells was increased by more than 30% in comparison with neighboring wells. These field trials have demonstrated that creating multiple fractures and enhancing stimulated reservoir volume is the key to the commercial development of ultra-low permeability reservoirs in the Changqing Oilfield. Keywords: permeability, porosity, logging, microseismic, productionPermalink: https://doi.org/10.1190/urtec2013-277FiguresReferencesRelatedDetailsCited ByParameter Optimization of Asynchronous Cyclic Waterflooding for Horizontal–Vertical Well Patterns in Tight Oil Reservoirs22 March 2022 | ACS Omega, Vol. 7, No. 13Using resistivity data to study the waterflooding process: A case study in tight sandstone reservoirs of the Ordos Basin, ChinaZhihao Jiang, Jinhua Fu, Gaoren Li, Zhiqiang Mao, and Peiqiang Zhao5 February 2021 | GEOPHYSICS, Vol. 86, No. 2 Unconventional Resources Technology Conference, Denver, Colorado, 12-14 August 2013ISSN (online):2159-6832Copyright: 2013 Pages: 1229 publication data© 2013 Published in electronic format with permission by the Society of Exploration Geophysicists, American Association of Petroleum Geologists, and Society of Petroleum EngineersPublisher:Unconventional Resources Technology ConferenceSociety of Exploration Geophysicists HistoryPublished: 26 Sep 2013 CITATION INFORMATION Yanrong CHANG, Hongjun LU, Baochun CHEN, Zhen-ning JI, Chengwang WANG, Yin QI, Jianshan LI, Xianfei DU, and Guiqin YIN, (2013), "Multi-Fracture Stimulation Techniques Make Better Wells in Ultra-Low Permeability Oil Reservoirs," SEG Global Meeting Abstracts : 2655-2664. https://doi.org/10.1190/urtec2013-277 Plain-Language Summary KeywordspermeabilityporosityloggingmicroseismicproductionPDF DownloadLoading ...