Analysis of possibilities to increase oil recovery with the use of nitrogen in the context of deep oil deposits of the Dnipro-Donetsk oil-and-gas Ukrainian province

Kondrat, Oleksandr; Lukin, O; Smolovyk, L

doi:10.33271/mining13.04.107

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…Taking into account the multi-layered structure of DDD fields, the presence of oil reservoirs and frequently faced water drive in the gas reservoirs [22,23], which leads to a gradual increase in the amount of produced water and the necessity of its injection or disposal, the efficiency of water flooding application to increase hydrocarbon recovery from gas condensate reservoir was investigated. The paper presents calculation results for the conditions of deeply buried gas condensate deposits of DDD with different potential yield: low (100 g/m 3 ), medium (300 g/m 3 ) and high (500 g/m 3 ) at different stages of the depletion drive, which were defined as the decrease of the average weighted formation pressure below the dew point pressure by 25, 50, 75% and at the pressure of maximum condensation.…”

Section: Discussionmentioning

confidence: 99%

Investigation of the efficiency of gas condensate reservoirs waterflooding at different stages of development

Burachok

Kondrat

Matkivskyi³

2021

E3S Web of Conf.

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The study of flooding gas condensate reservoirs at different stages of depletion (25, 50, 75% of the dew point pressure and at the maximum condensation pressure) with different potential hydrocarbon content of 100, 300 and 500 g/m3 and different voidage replacement by using injection (50, 100 and 150%). The results showed a positive effect of water injection on the increase of the condensate recovery factor, but a decrease in gas production compared to the basic options of development at depletion drive. Thus, for formation systems with medium and high potential yield of liquid hydrocarbons C5+, the largest incremental production is obtained in the case when water injection begins with minimum depletion of formation energy. While for a formation system with a low potential yield (100 g/m3) the maximum technological effect is obtained under the condition of maximum depletion. In the case of medium and high C5+ yield in the formation gas, with a slight decrease in the formation pressure by 25 or 50% of the dew point pressure, the maximum increase in the condensate recovery factor is achieved at high injection rates with 100 or 150% voidage replacement. The obtained results can be used for rapid screening of potential methods of impact on the gas condensate reservoir, and the final decision concerning the technological parameters of production and injection wells operation will be made due to the results of optimization of multivariate hydrodynamic calculations using geological and technological models.

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Section: Discussionmentioning

confidence: 99%

Investigation of the efficiency of gas condensate reservoirs waterflooding at different stages of development

Burachok

Kondrat

Matkivskyi³

2021

E3S Web of Conf.

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“…The high efficiency of nitrogen application as an injection agent is evidenced by the results from laboratory tests. According to the results reported in [16], nitrogen injection into the water-encroached productive reservoirs makes it possible to increase the gas saturation of the porous environment and provide conditions for the movement of water-trapped natural gas.…”

Section: The Influence Of Nitrogen Injection Duration At the Initial mentioning

confidence: 99%

The influence of nitrogen injection duration at the initial gas-water contact on the gas recovery factor

Matkivskyi

2021

EEJET

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This paper reports a study that employed a digital three-dimensional model of the gas condensate reservoir to investigate the process of nitrogen injection at the boundary of initial gas-water contact at different values of the injection duration. The calculations were performed for 5, 6, 8, 10, 12 and 14 months injection duration. Based on the modeling results, it was found that increasing the duration of the nitrogen injection decreases the operation time of production wells until the breakthrough of non-hydrocarbon gas. Based on the analysis of the technological indicators of reservoir development, it was established that the introduction of technology of the nitrogen injection into a reservoir ensures a reduction in the volume of reservoir water production. The cumulative water production at the time of nitrogen breakthrough to the production wells at the nitrogen injection duration of 5 months is 197,3 thousand m3; of 14 months – 0,038 m3. According to the results from the statistical treatment of estimation data, the optimal value for the nitrogen injection duration was determined, which is 8,04 months. The ultimate gas recovery factor for the optimal period of the non-hydrocarbon gas injection is 58,11 %, and in the development of a productive reservoir for depletion – 34,6 %. Based on the research results, the technological efficiency of nitrogen injection into a productive reservoir has been determined at the boundary of initial gas-water contact in order to slow the movement of reservoir water into gas-saturated horizons. This study results allow the improvement of the existing technologies of hydrocarbon fields development under conditions of water drive. The use of the results of the research carried out in production will make it possible to reduce the volume of cumulative water production and increase the ultimate gas recovery factors to 23,51 %

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“…Широкого застосування в нафтогазовій промисловості набуло використання азоту в якості агенту нагнітання. Результати лабораторних досліджень свідчать про високу технологічну ефективність нагнітання азоту в продуктивні поклади [12][13][14][15]. Відповідно до проведених в ІФНТУНГ теоретичних досліджень підтверджено ефективність нагнітання азоту в продуктивні поклади з метою витіснення залишкових запасів природного газу [16][17].…”

Section: виклад основного матеріалуunclassified

Influence of technological modes of well operation on the efficiency of regulation of the process of waterflooding of gas condensate reservoirs by carbon dioxide

Matkivskyi¹,

Kondrat²,

Haidarova³

et al. 2021

PDOGF

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Using the main tools of hydrodynamic modeling, the study of the influence of production well operating parameters on the regulation effectiveness of the gas condensate reservoirs’ flooding process by injection of carbon dioxide at the initial gas-water contact has been carried out. The study has been undertaken for various values of gas flow rate. The simulation results indicate a high technological efficiency of using carbon dioxide as an injection agent. High displacing properties of carbon dioxide provide an increase in the mobility of formation fluids (condensate, oil) and a decrease in the mobility of formation water. The introduction of the technology for injecting carbon dioxide into productive reservoirs at the initial gas-water contact provides the creation of additional hydrodynamic and filtration resistance on the path of formation water movement. Due to which the inflow of formation water into gas-saturated horizons is partially blocked and waterless operation of production wells is ensured during a longer period of further field development. Based on the results of processing the calculated data, the optimal value of the rate of natural gas production has been determined under the carbon dioxide injection into the productive reservoir at the boundary of the gas-water contact, outside of which the gas recovery factor changes insignificantly. At the time of the carbon dioxide breakthrough into the production wells, the optimal production rate of the production well is 55.93 th.m3/day. The predicted gas recovery factor for the given optimal value of the gas production rate is 64.99 %, and when developing for depletion it is 58.34 %. The results of the studies carried out indicate the technological efficiency of the introduction of technologies for injecting carbon dioxide into reservoirs, which are developed in a water drive in order to regulate the process of formation water flow into productive reservoirs and increase the final gas recovery factor.

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Analysis of possibilities to increase oil recovery with the use of nitrogen in the context of deep oil deposits of the Dnipro-Donetsk oil-and-gas Ukrainian province

Cited by 6 publications

References 15 publications

Investigation of the efficiency of gas condensate reservoirs waterflooding at different stages of development

Investigation of the efficiency of gas condensate reservoirs waterflooding at different stages of development

The influence of nitrogen injection duration at the initial gas-water contact on the gas recovery factor

Influence of technological modes of well operation on the efficiency of regulation of the process of waterflooding of gas condensate reservoirs by carbon dioxide

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