VSIT Theory
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This document discusses vibroseismic impact technology (VSIT) for stimulating water flooding oil reservoirs. It describes the key aspects of VSIT including positioning vibroseismic sources, vibration frequency, and stimulation duration. The mechanism of VSIT involves generating vortex movement in porous liquids to wash adhesive oil films off pore walls and mobilize trapped oil. Vibration causes microvortex transport inside rock pores. Potential mechanisms of stimulation include cavitation, coagulation, chemical reactions, and changing fluid-rock contact angle and wettability. Successful implementation of VSIT requires geological, reservoir, and production data collection and screening to determine feasibility and predicted performance.
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The document summarizes hydrogeological research on the impacts of proposed groundwater abstractions from the Merti Aquifer in Wajir, Kenya. Modeling shows drawdown from abstractions will likely not exceed 10 meters by 2050, which would not cause existing boreholes to run dry. However, upconing of saline water poses a risk of increasing borehole salinity. The risk depends on the unknown depth of the fresh-saline water boundary, with over 50% risk of salinization if it is less than 120 meters deep. Mitigation, like establishing the boundary depth or separating abstraction points, is needed to safely implement additional groundwater use from the aquifer. Dams and oil drilling
The hydrogeological risk asesment on the merti aquifer
1) The document discusses potential impacts of proposed groundwater abstractions from the Merti Aquifer in Wajir, Kenya, including drawdown of water levels and increased salinity.
2) Modeling shows drawdown from abstractions will be less than 10 meters by 2050, which does not pose risks of drying boreholes. However, shallower existing boreholes could be impacted.
3) Increased salinity poses a more serious risk, with modeling finding a 50% risk of boreholes becoming saline by 2050 depending on the unknown depth of the fresh-saline water boundary. Mitigation, like establishing this boundary depth, is needed.
4) Upstream dams and oil
EAGE_final
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This document provides an overview of groundwater hydrology and methods for exploring groundwater resources. It discusses the occurrence of groundwater and the purpose of groundwater exploration. It then describes various methods for groundwater exploration including remote sensing, surface geophysical methods like electrical resistivity and seismic refraction, well logging methods, and aquifer tests. It provides details on how to design, perform, and analyze aquifer pumping tests to determine the hydrological characteristics of water-bearing formations. Finally, it discusses factors to consider in the design of water wells.
Athens pecker 2005
The document summarizes the design and construction of the foundations for the Rion Antirion Bridge in Greece. Key points:
- The foundations had to withstand severe environmental conditions like weak soil, earthquakes, and tectonic movements. An innovative concept was adopted using large diameter caissons resting on reinforced natural ground with steel pipe inclusions.
- Under each caisson, 150-200 steel pipe inclusions 2m in diameter were driven into the soil in a 7m grid to reinforce it. A 2.8m thick gravel layer separated the caisson from the inclusions.
- This concept provided capacity design by allowing sliding at the gravel interface during large seismic forces, limiting forces on the super
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Hydrogeological studies were conducted that included infiltration tests, geophysical surveys, borehole drilling, and aquifer mapping. An infiltration test at the CLRI campus in Chennai found the soil type to be silty clay with infiltration rates between 3-30 cm/hr depending on time. Vertical electrical sounding using Schlumberger configuration identified aquifers down to 300m consisting of Quaternary alluvium and Cuddalore Sandstone. Borehole drilling using a DTH rig collected lithology and geophysical logs. Aquifer mapping was done using topographical sheets to delineate the extent, depth, and productivity of aquifers across the study area.
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Scenario modeling in hydrogeological risk involve a multidisciplinary approach in order to analyze, forecast and define the evolution of landslides and flood hazards. The first part of the work which focuses on the application of geology in engineering practice mainly for landslide evaluation and erosion evaluation.
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This document discusses sediment aggradation in reservoirs and the use of sediment bypass tunnels as an engineered solution. It provides background on why reservoirs accumulate sediment and the consequences. It then summarizes the empirical area increment method for predicting sediment deposition patterns in reservoirs based on factors like reservoir shape, sediment grain size, and operation. Finally, it discusses design considerations for sediment bypass tunnels, using the example of Mud Mountain Dam, and limitations of modeling these systems in HEC-RAS.
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GHGT_final_RE
This document outlines a study to assess the detectability of migrating carbon dioxide (CO2) using seismic modeling. It finds that the detectability depends on factors like the saturation distribution of CO2 and rock properties. Uniform CO2 saturation leads to a velocity decrease of 200 m/s while patchy saturation results in a smaller 50 m/s decrease. Forward modeling shows structurally trapped CO2 is clearly detectable but migrating CO2 fronts are only weakly visible. Detectability is also influenced by the reservoir properties, relative permeability curves, and heterogeneity from capillary trapping. Careful site characterization of factors impacting CO2 migration and storage is important for monitoring survey design to enable detection of containment loss.
Dfi2005 pecker
The Rion Antirion bridge in Greece connects the Peloponnese peninsula to the mainland across the Gulf of Corinth. Its foundations had to withstand severe environmental conditions including weak soils, earthquakes up to magnitude 7.0, and long-term tectonic movements. The innovative foundation concept adopted reinforced the natural ground with steel tubular piles and included a gravel layer between the piles and foundation raft. This provided capacity to resist the large seismic forces while minimizing differential settlement hazards. Extensive site investigations characterized the poor soil properties to ensure compatible design of seismic demand and foundation capacity.
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The document provides details about the Mumbai Coastal Road Project which includes construction of India's first undersea tunnel. Some key points:
1) A 2.07 km long twin tunnel is being constructed as part of the project, with 1 km being under the sea, making it unique from other tunnels worldwide.
2) India's largest Tunnel Boring Machine (TBM) named 'Mavala' has been deployed to excavate the tunnel and broke excavation records.
3) The tunnels will be 11 meters in diameter and constructed using concrete segmental lining for structural support and stability.
4) Numerical analysis of stress redistribution during various construction stages and the long-term condition will be conducted
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Thehydrogeologicalriskasesmentonthemertiaquifer 140924052815-phpapp02
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VSIT Theory
- 2. SHORT DESCRIPTION OF VSIT-METHOD The main points of vibroseismic treatment of watering oil reservoirs: • Position of vibroseismic source • Frequency of vibroseismic waves • Duration of stimulation Analysis of natural and laboratory experiments had led to the development of the concept of the mechanism of vibroseismic stimulation on the watering oil reservoirs. This mechanism might be called hydrodynamical washing of the pores’ walls from the adhesive films and drops of oil by vibroseismically generated vortex movement of porous liquid with further involving of oil in macrodynamical flows.
- 3. Vibration Source of Vertical Force: P-waves (left), S-waves (right) 0 2 0 0 4 0 0 Р а д и у с , м - 1 0 0 0 - 8 0 0 - 6 0 0 - 4 0 0 - 2 0 0 0 Глубина,м 0 2 0 0 4 0 0 Р а д и у с , м - 1 0 0 0 - 8 0 0 - 6 0 0 - 4 0 0 - 2 0 0 0
- 4. Liquid microvortex transport inside rock pores after vibration stimulation (GEOSVIP JSC, 2005) Vibroseismic MechanismPhysically Change
- 5. Mechanisms that might be responsible for stimulation: • Cavitation • Coagulation • Chemical reaction • Emulsification • Coalesence and dislodging of oil droplet • Destroy surface film on the pore surface • “Squeezed effect” of the pore system
- 6. Sergey A. Kostrov and Bill O. Wooden mechanism ‘Dislodging and Coalesence’
- 7. - 1 . 2 - 0 . 8 - 0 . 4 0 . 0 0 . 4 0 . 8 U , m V 0 4 0 8 0 1 2 0 1 6 0 Краевойугол,град-Contactangle,grad 9090 Potential connection of electricity to fluid-rock contact angle (Summ. Goruynov, 1976) Vibroseismic MechanismPhysically Change
- 8. DYNAMICS WETTABILITY CHANGES CONTACT ANGLE CHANGES
- 9. Vibroseismic Mechanism : kro curve lift
- 10. Comprehensive STEPS • Geological, Reservoir, and Production Data Collection • Feasibility Study: Screening, Base Line determination and Performance Prediction • Vibroseismic Implementation (normally, 30-60 days)
- 11. • Surface land condition : hard soil. • Surface facility : on-shore • Reservoir rock type : consolidated • Depth of the producing reservoir < 6500 ft • Reservoir lithology = preferably sandstone • Field recovery stage = WF • Water cut > 80% • Permeability = Fair to Good • Clay content : low • Reservoir layer = preferably single • API = 20-40 degree. • Viscosity < 10 cp • Reservoir wettability = water wet • Population density around the field = no houses less than 100 m from the vibration sources VSIT Screening Criteria
- 12. Some Previous Research • “Effect of Vibration on Rock and Fluid Properties: On Seeking Vibroseismic Technology Mechanisms” Paper SPE No. 93112, SPE Asia Pacific Oil & Gas Conference and Exhibition, Jakarta 2005. • “Semi-analytical Approach of Optimum Vibration Frequency Determination that Gives Maximum Improvement of Reservoir Rock Porosity” IPA 30th Annual Convention and Exhibition, Jakarta, 2005.