Show simple item record

dc.creatorWang, Wenli, master of science in petroleum engineering
dc.date.accessioned2012-02-20T17:37:24Z
dc.date.available2012-02-20T17:37:24Z
dc.date.created2011-12
dc.date.issued2012-02-20
dc.date.submittedDecember 2011
dc.identifier.urihttp://hdl.handle.net/2152/ETD-UT-2011-12-4637
dc.descriptiontext
dc.description.abstractExtraction of oil and gas can cause reduction in pore pressure, occasionally resulting in subsequent compaction that forms a surface subsidence bowl, especially in shallow reservoirs. In the last 10 years, there has been over 10 feet of subsidence in parts of the Lost Hills oil field in California (Bruno et al.,1992). The surface subsidence at Lost Hills not only causes damage to surface facilities and wells, but also reactivates faults and reduces rock permeability. Subsidence makes reservoir optimization difficult. Hence, it is important to assess or predict the surface subsidence and the reasons for subsidence early in the life of an oil field to make an optimization plan. We use jointly the capacitance resistance model (CRM) (Alberoni et al., 2002 and Yousef, et al., 2006) that relies only on injection and production data, and the InSAR satellite imagery of surface subsidence. From CRM simulations, we estimate the connectivity between injectors and producers as well as general water flow directions from individual injectors. We then superimpose well connectivity and InSAR imagery to diagnose the reasons for the subsidence. Using new surface subsidence models, which are based on the continuity equation of CRM and rock mechanics, we are able to predict the average surface subsidence at Lost Hills from the injection and production rates. Our work shows that there was significant volumetric rock damage at Lost Hills and the well connectivity changed dramatically with time because of reservoir compaction and the rock damage. We conclude that for a soft, fragile and nearly- impermeable rock such as the diatomite, high injection rate weakens the rock and creates dynamic water flow tubes or ‘channels’ without providing good pressure support to the reservoir. These high permeability ‘channels’ re-circulate most of the injected water between the injectors and producers. Our CRM/InSAR approach is new and gives insights into the time-dependent and spatially variable fluid flow fields in a relatively shallow waterflood. Consequently, we may be able to suggest optimum water injection strategies to enhance oil production, while minimizing rock damage and surface subsidence. In addition, the proposed surface subsidence models are convenient and reliable to predict the average surface subsidence.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.subjectReservoir characterization
dc.subjectCapacitance resistance model
dc.subjectSurface subsidence
dc.titleReservoir characterization using a capacitance resistance model in conjunction with geomechanical surface subsidence models
dc.date.updated2012-02-20T17:37:34Z
dc.identifier.slug2152/ETD-UT-2011-12-4637
dc.description.departmentPetroleum and Geosystems Engineering
dc.type.genrethesis*
thesis.degree.departmentPetroleum and Geosystems Engineering
thesis.degree.disciplinePetroleum Engineering
thesis.degree.grantorUniversity of Texas at Austin
thesis.degree.levelMasters
thesis.degree.nameMaster of Science in Engineering


Files in this item

Icon

This item appears in the following Collection(s)

Show simple item record