Weak Gel Formulations for Selective Control of Water Production in High-Permeability and High-Temperature Production Wells

1993 ◽  
Author(s):  
Norbert Kohler ◽  
Ramine Rahbari ◽  
Ming Han ◽  
Alain Zaitoun
Keyword(s):  
High Temperature ◽  
Water Production ◽  
High Permeability ◽  
Selective Control ◽  
Production Wells ◽  
Weak Gel ◽  
Gel Formulations

Production wells killing on R. Trebs high-temperature cavernous-fractured carbonate deposits

2017 ◽  
pp. 41-45
Author(s):  
S.A. Vakhrushev ◽  
◽  
A.G. Mikhailov ◽  
D.S. Kostin ◽  
A.R. Dindaryanov ◽  
...  
Keyword(s):  
High Temperature ◽  
Fractured Carbonate ◽  
Production Wells ◽  
Carbonate Deposits

scholarly journals Numerical modelling of the cooling effect in geothermal reservoirs induced by injection of CO2 and cooled geothermal water

2020 ◽  
Vol 75 ◽  
pp. 15
Author(s):  
Hejuan Liu ◽  
Qi Li ◽  
Yang Gou ◽  
Liwei Zhang ◽  
Wentao Feng ◽  
...  
Keyword(s):  
Injection Pressure ◽  
Geothermal Water ◽  
Geothermal Reservoir ◽  
Cooling Effect ◽  
Reservoir Pressure ◽  
Temperature Decrease ◽  
Water Production ◽  
Production Well ◽  
Production Wells ◽  
Thermal Breakthrough

The utilization of geothermal energy can reduce CO2 emissions into the atmosphere. The reinjection of cooled return water from a geothermal field by a closed loop system is an important strategy for maintaining the reservoir pressure and prolonging the depletion of the geothermal reservoir by avoiding problems, e.g., water level drawdown, ground subsidence, and thermal pollution. However, the drawdown of water injectivity affected by physical and chemical clogging may occur in sandstone aquifers, and the reservoir temperature may be strongly affected by the reinjection of large amounts of cooled geothermal water, thus resulting in early thermal breakthrough at production wells and a decrease in production efficiency. In addition to the injection of cooled geothermal water, the injection of CO2 can be used to maintain the reservoir pressure and increase the injectivity of the reservoir by enhancing water–rock interactions. However, the thermal breakthrough and cooling effect of the geothermal reservoir may become complex when both CO2 and cooled geothermal water are injected into aquifers. In this paper, a simplified small-scale multilayered geological model is established based on a low-medium geothermal reservoir in Binhai district, Tianjin. The ECO2N module of the TOUGH2MP simulator is used to numerically simulate temperature and pressure responses in the geothermal reservoir while considering different treatment strategies (e.g., injection rates, temperatures, well locations, etc.). The simulation results show that a high injection pressure of CO2 greatly shortens the CO2 and thermal breakthrough at the production well. A much lower CO2 injection pressure is helpful for prolonging hot water production by maintaining the reservoir pressure and eliminating the cooling effect surrounding the production wells. Both pilot-scale and commercial-scale cooled water reinjection rates are considered. When the water production rate is low (2 kg/s), the temperature decrease at the production well is negligible at a distance of 500 m between two wells. However, when both the production and reinjection rates of cooled return water are increased to 100 m3/h, the temperature decrease in the production well exceeds 10 °C after 50 years of operation.

scholarly journals Effective Mechanisms to Relate Initial Rock Permeability to Outcome of Relative Permeability Modification

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4688 ◽  
Author(s):  
Faaiz Al-shajalee ◽  
Colin Wood ◽  
Quan Xie ◽  
Ali Saeedi
Keyword(s):  
Relative Permeability ◽  
Pore Radius ◽  
Water System ◽  
Water Production ◽  
High Permeability ◽  
Gas Reservoirs ◽  
Rock Permeability ◽  
Adsorbed Polymer ◽  
Permeability Modification ◽  
Initial Rock

Excessive water production is becoming common in many gas reservoirs. Polymers have been used as relative permeability modifiers (RPM) to selectively reduce water production with minimum effect on the hydrocarbon phase. This manuscript reports the results of an experimental study where we examined the effect of initial rock permeability on the outcome of an RPM treatment for a gas/water system. The results show that in high-permeability rocks, the treatment may have no significant effect on either the water and gas relative permeabilities. In a moderate-permeability case, the treatment was found to reduce water relative permeability significantly but improve gas relative permeability, while in low-permeability rocks, it resulted in greater reduction in gas relative permeability than that of water. This research reveals that, in an RPM treatment, more important than thickness of the adsorbed polymer layer ( e ) is the ratio of this thickness on rock pore radius ( e r ).

An Active Method for Characterization of Flow Units Between Injection/Production Wells by Injection-Rate Design

2011 ◽  
Vol 14 (04) ◽  
pp. 433-445 ◽  
Author(s):  
Kun-Han Lee ◽  
Antonio Ortega ◽  
Amir Mohammad Nejad ◽  
Iraj Ershaghi
Keyword(s):  
Reservoir Characterization ◽  
Injection Rate ◽  
High Permeability ◽  
Injection Wells ◽  
Flow Units ◽  
Weight Factors ◽  
Production Wells ◽  
Preferential Flows ◽  
Injection Rates

Summary This paper presents a novel data-mining method to characterize the flow units between injection and production wells in a waterflood, using carefully implemented variations in injection rates. The method allows the computation of weight factors representing the influence of any of the injectors surrounding a given producer. The weight factors are used to characterize the effective contribution of injection wells to the total gross production in surrounding production wells. A wavelet approach is used to design the perturbation in the injection rates and to analyze the observed variations in the gross production rates. Tracking the contribution of injectors to various producers can help in balancing voidage replacement in waterflood optimization. A second application is reservoir characterization, in which information provided by the proposed procedure can help in mapping high-permeability flow units such as channels and fractures as well as flow barriers between wells. The method was calibrated and tested successfully for simulated line-drive and five-spot patterns with various assumed flow units and flow-heterogeneity conditions. The paper also includes a case study for a tight-formation waterflood in which the weight factors are intended to delineate the pattern of natural high-permeability channels causing preferential flows.

New Polymer Gels for Reducing Water Production in High-Temperature Reservoirs

1994 ◽  
Author(s):  
Paola Albonico ◽  
Martin Bartosek ◽  
T.P. Lockhart ◽  
Emilio Causin
Keyword(s):  
High Temperature ◽  
Polymer Gels ◽  
Water Production

scholarly journals Seismic Response to Injection Well Stimulation in a High-Temperature, High-Permeability Reservoir

2021 ◽  
Author(s):  
C Hopp ◽  
Steven Sewell ◽  
S Mroczek ◽  
Martha Savage ◽  
John Townend
Keyword(s):  
High Temperature ◽  
Compressive Stress ◽  
Flow Rate ◽  
Matched Filter ◽  
Taupo Volcanic Zone ◽  
Valuable Insight ◽  
High Permeability ◽  
Injection Flow Rate ◽  
Well Stimulation ◽  
Injection Flow

©2019. American Geophysical Union. All Rights Reserved. Fluid injection into the Earth's crust can induce seismic events that cause damage to local infrastructure but also offer valuable insight into seismogenesis. The factors that influence the magnitude, location, and number of induced events remain poorly understood but include injection flow rate and pressure as well as reservoir temperature and permeability. The relationship between injection parameters and injection-induced seismicity in high-temperature, high-permeability reservoirs has not been extensively studied. Here we focus on the Ngatamariki geothermal field in the central Taupō Volcanic Zone, New Zealand, where three stimulation/injection tests have occurred since 2012. We present a catalog of seismicity from 2012 to 2015 created using a matched-filter detection technique. We analyze the stress state in the reservoir during the injection tests from first motion-derived focal mechanisms, yielding an average direction of maximum horizontal compressive stress (SHmax) consistent with the regional NE-SW trend. However, there is significant variation in the direction of maximum compressive stress (σ1), which may reflect geological differences between wells. We use the ratio of injection flow rate to overpressure, referred to as injectivity index, as a proxy for near-well permeability and compare changes in injectivity index to spatiotemporal characteristics of seismicity accompanying each test. Observed increases in injectivity index are generally poorly correlated with seismicity, suggesting that the locations of microearthquakes are not coincident with the zone of stimulation (i.e., increased permeability). Our findings augment a growing body of work suggesting that aseismic opening or slip, rather than seismic shear, is the active process driving well stimulation in many environments.

Development of high-temperature high-permeability MnZn power ferrites for MHz application by Nb2O5 and TiO2 co-doping

2020 ◽  
Vol 46 (7) ◽  
pp. 8935-8941 ◽  
Author(s):  
Shengbo Yi ◽  
Guohua Bai ◽  
Xiaoyu Wang ◽  
Xuefeng Zhang ◽  
Akhlaq Hussain ◽  
...  
Keyword(s):  
High Temperature ◽  
High Permeability ◽  
Co Doping
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