scholarly journals THE EFFECT OF THE CYCLICAL NITROGEN INJECTION ON THE FINAL COEFFICIENT OF GAS RECOVERY AT DIFFERENT RATES IN THE DEPLETED GAS RESERVOIR

2018 ◽  
pp. 15-22
Author(s):  
R. M. Kondrat ◽  
L. I. Khaidarova
Keyword(s):  
Gas Production ◽  
Reservoir Pressure ◽  
Hydrocarbon Gases ◽  
Gas Reservoir ◽  
Recovery Coefficient ◽  
Research Results ◽  
Gas Recovery ◽  
Nitrogen Injection ◽  
Residual Gas ◽  
Depleted Gas Reservoir

The application of non-hydrocarbon gases with the aim of displacing residual gas from depleted fields is substantiated. Mathematical modeling is carried out of the process of residual gas displacing with nitrogen in the GEM compositional simulating module under the conditions of a hypothetical gas reservoir of circular shape. The said module is a part of the licensed CMG computer program. The effect of the cyclical nature of the aquifer injection nitrogen into depleted gas reservoir at different rates till the final gas recovery coefficient for residual gas is developed. The study concerns different durations of nitrogen injection cycles into the reservoir (6, 12, 18, 24, 30, and 36 months) and various correlations of the rates of nitrogen injection and gas production in reservoir conditions of 1:1; 1.5:1; 2:1. During the nitrogen injection into the reservoir, the output wells stopped; whereas after surcease of the nitrogen injection, they were again exploited until the reservoir pressure reached to 0.1 Pprimary. Then the process of cyclic nitrogen injection into the layer continued, until nitrogen break through into the producing wells and its content in the produced products reached 5% vol. The research results were processed in the form of graphical dependencies of reservoir pressure, gas flow rate and gas recovery coefficient for residual gas at the end of the cycle of nitrogen injection into the reservoir as a function of the number of such cycles. The research results indicate a significant effect on the gas recovery coefficient for the residual gas of the duration of the cycle of nitrogen injection into the reservoir and the ratio of rates of nitrogen injection and gas production, with an increase in which the coefficient of gas output gradually decreases. According to the research results, the optimal parameters of the process of nitrogen injection into the reservoir should be chosen on the basis of technological results, as well as technical and economic calculations.

scholarly journals Influence of the rate of the lawful injection of nitrogen into a depleted gas reservoir of circular shape on the residual gas recovery ratio

2018 ◽  
pp. 70-74
Author(s):  
R. M. Kondrat ◽  
L. I. Khaidarova
Keyword(s):  
Computer Program ◽  
Gas Production ◽  
Recovery Ratio ◽  
Reservoir Pressure ◽  
Gas Reservoir ◽  
Gas Recovery ◽  
Nitrogen Injection ◽  
Residual Gas ◽  
The Impact ◽  
Depleted Gas Reservoir

The use of nitrogen for the replacement of residual gas from depleted gas deposits is justified. The latest research and publications on the use of nitrogen to improve gas recovery from depleted gas deposits is analyzed. Using the licensed computer program CMG, the impact of the rate of nitrogen injection into the depleted gas reservoir on its indices for development (reservoir pressure, gas production, nitrogen content in the production gas, and gas recovery factor for the residual gas) has been studied.

scholarly journals ESTIMATION OF TECHNOLOGICAL EFFICIENCY OF WORK AND SHUTDOWN OF PRODUCTION WELLS WITH NITROGEN INJECTION INTO THE DEPLETED GAS RESERVOIR

2018 ◽  
pp. 7-11
Author(s):  
R. M. Kondrat ◽  
L. I. Khaidarova
Keyword(s):  
Group Program ◽  
Gas Reservoir ◽  
Gas Recovery ◽  
Nitrogen Injection ◽  
Technological Efficiency ◽  
Modeling Group ◽  
Production Wells ◽  
Residual Gas ◽  
Composite Modeling ◽  
Depleted Gas Reservoir

The main directions of increasing hydrocarbon output from depleted gas deposits and possible options of injecting nitrogen into the reservoir are described. For the conditions of a depleted hypothetical gas reservoir, a mathematical modeling of the process of displacement of the residual gas by nitrogen using the composite modeling module GEM, which is part of the CMG (Computer Modeling Group) program, was performed. Based on the results of the research, the effect on the gas recovery factor for the residual gas and other technical indicators was established on the development of the work and production wells shut-down zone when nitrogen was injected into the deposit with different time periods.

scholarly journals EXTRACTION OF THE RESIDUAL GAS DEPLETED GAS RESERVOIRS NITROGEN INJECTION

2019 ◽  
pp. 20-29
Author(s):  
R. M. Kondrat ◽  
O. R. Kondrat ◽  
L. I. Khaidarova
Keyword(s):  
Porous Medium ◽  
Nitrogen Content ◽  
Physical Nature ◽  
Hydrocarbon Gases ◽  
Recovery Coefficient ◽  
Gas Recovery ◽  
Nitrogen Injection ◽  
Start Of Injection ◽  
Depleted Gas Reservoirs ◽  
Residual Gas

The relevance and feasibility of extracting residual gas from depleted gas deposits is shown. The possible directions of the extraction of residual gas from depleted gas deposits by its displacement from a porous medium of non-hydrocarbon gases are characterized. The use of nitrogen to displace natural gas from a porous medium has been substantiated. Using the GEM compositional modeling module, which is included in the licensed computer program CMG (Computer Modeling Group), studies were made of the effect of the pressure of the start of injection of nitrogen into the reservoir and the duration of its injection period on the gas recovery coefficient for residual gau. The study was conducted for deposits of square and round shape. The research results are presented in the form of graphical dependencies of the current reservoir pressure, nitrogen content in borehole products and gas recovery coefficient for residual gas from the pressure of the start of injection of nitrogen into the reservoir and the duration of the period of its injection. Using the results of the research, the optimal values ​​of the parameters of the process of injecting nitrogen into the exhausted gas deposits of square and round forms and the corresponding values ​​of the gas recovery coefficient were established. For the considered deposits of square and rounded forms, they are 0.29 Рin and 14.8 months, 0.31 Рin and 12.9 months, respectively. At the time of reaching the volumetric nitrogen content in the producing gas of 5 %, the gas recovery coefficient for residual gas for a square-shaped deposit is 83.91 %, for a round-shaped deposit – 77.49 %. The physical nature of the process of displacing residual gas with nitrogen from depleted gas deposits of square and round forms is characterized.

scholarly journals The application of nitrogen to increase gas recovery from depleten gas deposits

2018 ◽  
pp. 7-16
Author(s):  
R. М. Kondrat ◽  
L. I. Khaidarova
Keyword(s):  
Natural Gas ◽  
Gas Production ◽  
Hydrocarbon Gases ◽  
Research Results ◽  
Industrial Experience ◽  
Gas Recovery ◽  
Nitrogen Injection ◽  
Production Wells

The research results on residual natural gas displacement from depleted gas deposits by various non-hydrocarbon gases are analyzed. The use of nitrogen for this purpose is proved. The research results and industrial experience in obtaining nitrogen from air and purifying nitrogen from the products of gas production wells in case of nitrogen injection into depleted gas deposits to increase gas recovery are summarized.

An investigation of methods for calculating the volume of methane dissolved in reservoir water

2021 ◽  
pp. 103-111
Author(s):  
O. V. Fominykh ◽  
S. A. Leontiev
Keyword(s):  
Saline Water ◽  
Gas Production ◽  
Reliable Estimate ◽  
Dissolved Gas ◽  
Hydrocarbon Gases ◽  
Reservoir Water ◽  
Gas Recovery ◽  
Production Technologies ◽  
Residual Gas ◽  
Gas Fields

Existing gas production technologies limit gas recovery at the level of 85 %. Therefore, it is important to introduce technologies that make it possible to maximize the volume of production and intensify the inflow; for their selection it is important to have a reliable estimate of the residual gas reserves, since with a significant volume of the aquifer of gas fields, the volume of dissolved gas can be up to 10 % of the total reserves of the reservoir, which should be taken into account when designing the application of technologies to increase gas recovery.The main hydrocarbon dissolving in reservoir water is methane. In this regard, it is of interest to study methods that make it possible to determine the volume of hydrocarbon gases dissolved in saline water, which will make it possible to determine the total reserves of such gas. We investigated the existing methods for calculating the amount of methane dissolved in reservoir water, and gave a quantitative assessment of the volume of gas dissolved in water.

scholarly journals INFLUENCE OF THE SYSTEM OF PRODUCTION AND INJECTION WELLS AREAL PLACING WHILE INJECTING NITROGEN INTO THE DEPLETED GAS RESERVOIR ON THE GAS RECOVERY RATIO

2019 ◽  
pp. 33-40
Author(s):  
R. M. Kondrat ◽  
L. I. Khaidarova
Keyword(s):  
Recovery Ratio ◽  
Hydrocarbon Gases ◽  
Gas Reservoir ◽  
Injection Wells ◽  
Gas Recovery ◽  
Reservoir Development ◽  
Wide Range ◽  
Production Wells ◽  
Gas Bearing ◽  
Depleted Gas Reservoir

The results of experimental and theoretical studies of the displacement of residual natural gas from the depleted gas deposits by non-hydrocarbon gases are analyzed, and the use of nitrogen as a displacing agent is substantiated. The authors present results of computer studies of areal injection of nitrogen into a hypothetical depleted gas reservoir at 4-, 5-, 7- and 9-point well placing systems in the gas-bearing area and the distance of 500, 750, 1000 and 1250 m from the central injection well to peripheral production wells. The article designates the significant influence of the well placing system in the gas-bearing area and thedistance between the injection and production wells on the gas recovery ratio as to residual gas and on the duration of the further reservoir development period until the moment when nitrogen breaks through into production wellsand the nitrogen content in the formation product is 5 % vol. The research has got a wide range of changes in their values (from 6.92 to 56.44 % for the gas recovery ratio at the time of nitrogen breakthrough into production wells, from 4 to 49 months for the duration of the additional reservoir production process). It gives possibilities to optimize the system of production and injection wells placing in the gas-bearing area, taking into account the technological and techno-economic indicators of further reservoir development. The results are recommended to use when designing the areal injection of nitrogen for a real depleted gas reservoir.

scholarly journals Utilization of CO2 as Cushion Gas for Depleted Gas Reservoir Transformed Gas Storage Reservoir

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 576 ◽  
Author(s):  
Cheng Cao ◽  
Jianxing Liao ◽  
Zhengmeng Hou ◽  
Hongcheng Xu ◽  
Faisal Mehmood ◽  
...  
Keyword(s):  
Natural Gas ◽  
Production Rate ◽  
Water Saturation ◽  
Gas Storage ◽  
Periodic Change ◽  
Residual Water ◽  
Reservoir Pressure ◽  
Gas Reservoir ◽  
Reservoir Permeability ◽  
Depleted Gas Reservoir

Underground gas storage reservoirs (UGSRs) are used to keep the natural gas supply smooth. Native natural gas is commonly used as cushion gas to maintain the reservoir pressure and cannot be extracted in the depleted gas reservoir transformed UGSR, which leads to wasting huge amounts of this natural energy resource. CO2 is an alternative gas to avoid this particular issue. However, the mixing of CO2 and CH4 in the UGSR challenges the application of CO2 as cushion gas. In this work, the Donghae gas reservoir is used to investigate the suitability of using CO2 as cushion gas in depleted gas reservoir transformed UGSR. The impact of the geological and engineering parameters, including the CO2 fraction for cushion gas, reservoir temperature, reservoir permeability, residual water and production rate, on the reservoir pressure, gas mixing behavior, and CO2 production are analyzed detailly based on the 15 years cyclic gas injection and production. The results showed that the maximum accepted CO2 concentration for cushion gas is 9% under the condition of production and injection for 120 d and 180 d in a production cycle at a rate of 4.05 kg/s and 2.7 kg/s, respectively. The typical curve of the mixing zone thickness can be divided into four stages, which include the increasing stage, the smooth stage, the suddenly increasing stage, and the periodic change stage. In the periodic change stage, the mixed zone increases with the increasing of CO2 fraction, temperature, production rate, and the decreasing of permeability and water saturation. The CO2 fraction in cushion gas, reservoir permeability, and production rate have a significant effect on the breakthrough of CO2 in the production well, while the effect of water saturation and temperature is limited.

scholarly journals Effects of the rate of natural gas production on the recovery factor during carbon dioxide injection at the initial gas-water contact

2021 ◽  
Vol 1 (3(57)) ◽  
pp. 6-11
Author(s):  
Serhii Matkivskyi
Keyword(s):  
Carbon Dioxide ◽  
Natural Gas ◽  
Gas Production ◽  
Gas Condensate ◽  
Recovery Factor ◽  
Formation Water ◽  
Hydrocarbon Gases ◽  
Water Contact ◽  
Natural Gas Production ◽  
Gas Recovery

The object of research is gas condensate reservoirs, which is being developed under the conditions of the manifestation of the water drive of development and the negative effect of formation water on the process of natural gas production. The results of the performed theoretical and experimental studies show that a promising direction for increasing hydrocarbon recovery from fields at the final stage of development is the displacement of natural gas to producing wells by injection non-hydrocarbon gases into productive reservoirs. The final gas recovery factor according to the results of laboratory studies in the case of injection of non-hydrocarbon gases into productive reservoirs depends on the type of displacing agent and the level heterogeneity of reservoir. With the purpose update the existing technologies for the development of fields in conditions of the showing of water drive, the technology of injection carbon dioxide into productive reservoirs at the boundary of the gas-water contact was studied using a digital three-dimensional model of a gas condensate deposit. The study was carried out for various values of the rate of natural gas production. The production well rate for calculations is taken at the level of 30, 40, 50, 60, 70, 80 thousand m3/day. Based on the data obtained, it has been established that an increase in the rate of natural gas production has a positive effect on the development of a productive reservoir and leads to an increase in the gas recovery factor. Based on the results of statistical processing of the calculated data, the optimal value of the rate of natural gas production was determined when carbon dioxide is injected into the productive reservoir at the boundary of the gas-water contact is 55.93 thousand m3/day. The final gas recovery factor for the optimal natural gas production rate is 64.99 %. The results of the studies carried out indicate the technological efficiency of injecting carbon dioxide into productive reservoirs at the boundary of the gas-water contact in order to slow down the movement of formation water into productive reservoirs and increase the final gas recovery factor.

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