Investigation of Bazhenov formation using thermal core logging technique

Popov, Yu. A.; Popov, Evgeny; Чехонин, E.; Gabova, Anastasia; Romushkevich, R.; Spasennykh, М.; Zagranovskaya, D. E.

doi:10.24887/0028-2448-2017-3-22-27

Cited by 7 publications

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“…The insufficient filtration properties of the Bazhenov formation result in a low effective thermal conductivity. 46 This could lead to poor distribution of temperature in the rock matrix due to heat loss. 20 Figure 13 shows the distribution of heat near a fracture during one of the hot water injection cycles.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the following thermal effects were specified: The thermal conductivity of the rock was 1.7014 Wt/(m*K) A decrease in residual oil saturation following the increase in temperature (the shapes of the relative permeabilities have an experimentally validated dependence on temperature). An increase in effective permeability depending on the increase in porosity after the thermal cracking of solidified bitumen and kerogen and an increase in effective permeability depending on the temperature increase in ultra-low-permeability zones. − The dynamic viscosity was determined by the Andrade equation, which is the most suitable correlation for the temperature range studied. …”

Section: Description and Adjustment Of The Simulation Modelmentioning

confidence: 99%

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Enhanced Oil Recovery Method Selection for Shale Oil Based on Numerical Simulations

et al. 2021

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As unconventional reserves, oil shale deposits require additional oil recovery techniques to achieve favorable production levels. The efficiency of a shale reservoir development project is highly dependent on the application of enhanced oil recovery (EOR) techniques. There are many studies devoted to discrete investigations of each EOR method. Most of them claim that one particular method is particularly effective in increasing oil recovery. Despite the wealth of such research, it remains hard to say with certainty which technique would be the most effective when applied in the extraction of unconventional reserves. In this work, we aim to answer this question by means of a comparative study. Three EOR methods were applied and analyzed in the same environment, a single target objectan oil field in Western Siberia characterized by ultra-low permeability (0.03 mD on average) and high organic content. Methods involving huff-and-puff injection of a surfactant solution, hydrocarbon gas, and hot water were studied using numerical reservoir simulations based on preceding laboratory experiments. A single horizontal well having undergone nine-stage hydraulic fracturing was used as the field site model. The comparative calculations of cumulative oil production over an 8-year period revealed that the injection of hot (supercritical) water led to the highest oil recovery in the target shale reservoir. Each EOR method was implemented using the best operation scenario. All three cases resulted in an increase in cumulative oil production compared to the depletion mode, though the efficiency was distinctly different. Twenty-six percent more oil was obtained after hot water injection, 16% after hydrocarbon gas, and 12% after a surfactant solution. Simulation of a hot water huff-and-puff operation over a longer period (43 years) led to a level of oil production 3 times higher than depletion. The drawbacks of each EOR method on the shale site are discussed in the results. A possible solution was proposed for preventing the negative effects of heat loss and water blockage incurred from hot water injection. The comparative study concludes that hot water injection should lead to the highest volume of oil recovery. The conclusions drawn are suggested to be relevant for similar shale fields.

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Section: Resultsmentioning

confidence: 99%

Section: Description and Adjustment Of The Simulation Modelmentioning

confidence: 99%

Enhanced Oil Recovery Method Selection for Shale Oil Based on Numerical Simulations

et al. 2021

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“…(АО «РИТЭК») Впервые в геолого-геофизической практике проведены детальные исследования комплекса тепловых свойств пород доманиковой формации на территории Самарской области на лицензионных участках АО «РИТЭК». Работы выполнялись методом непрерывного бесконтактного профилирования тепловых свойств на керне [1][2][3][4]. Для скважины Добрынинского месторождении изучено 16,9 м полноразмерного керна (167 образцов), для скважины Западно-Авралинское месторождения -21,9 м (200 образцов).…”

Section: результаты комплексных исследований доманиковой формации путunclassified

“…За счет уникально высокого пространственного разрешения (1 мм) при теплофизическом профилировании керна и установленных связей типа «керн-ГИС» и «керн-керн»[2][3][4] возникают новые возможности этой технологии для оценки однородности кернового материала, что позволяет существенно дополнить возможности традиционного комплекса методов ГИС и лабораторной петрофизики[2][3][4].…”

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Results of Combined Investigations of Domanic Formation with Continuous Thermal Core Profiling

Popov¹,

Popov²,

Gabova³

et al. 2017

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SUMMARYFor the first time, a detailed study of thermal properties (thermal conductivity, volumetric heat capacity, thermal anisotropy and heterogeneity coefficients) of Domanic formation rocks was carried out using the method of continuous non-contact thermal core profiling. Results of the study showed that core samples of Domanic formation are characterized by significant multi-scale heterogeneity and anisotropy. Based on the results of thermal conductivity profiling, continuous high-resolution (1 mm) profiles of total organic carbon (TOC) were obtained, that significantly extended and enriched the results of pyrolysis. Close correlations between thermal conductivity and density, thermal conductivity and sonic velocities were established with the use of well logging data. It allows predicting of rock mechanical properties without core destruction independently of sonic logging data quality (wellbore walls condition, etc.). Detailed profiles of geomechanical properties were reconstructed through established correlations and successfully compared with results of sonic logging along a studied section of Domanic formation. Conducted study shows that combination of traditional study and express high-resolution non-contact thermal core profiling makes it possible to optimize sample collection for laboratory study and characterize formation by high-resolution profiles of different properties of Domanic formation rocks.

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“…Despite the above features, the integration of scratching data and thermal profiling is of practical interest, particularly for unconventional formations [10,12,14,17,20,[41][42][43][44], since it allows us to refine the rock typing, quantitatively evaluate heterogeneity in strength and thermal properties, determine the locations of sampling for further laboratory studies (accounting for rock heterogeneity and thermal anisotropy), and establish for individual intervals the dependence of the "UCS-thermal conductivity" relationship to further use them for predicting UCS with the results of optical scanning.…”

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Integration of Thermal Core Profiling and Scratch Testing for the Study of Unconventional Reservoirs

et al. 2021

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Core analysis provides the essential information necessary for the characterization and development of hydrocarbon reservoirs. High core-scale heterogeneity and anisotropy, natural in unconventional reservoirs, complicate reservoir characterization and dictate the sampling methodology used. Continuous high-resolution thermal measurements with an optical scanner and scratcher along the core column can yield benefits in a sampling strategy. This article describes some features of the suggested integration of non-destructive thermal profiling with partially destructive scratch testing applied for the study of rocks from the Bazhenov Formation (West Siberia, Russia). The spatial variation in the unconfined compressive strength and thermal conductivity components parallel and perpendicular to bedding for more than 1000 samples are demonstrated and discussed on core and log scales. The relationships between these properties are established for different rock types composing the formation. The joint analysis allows specialists to correctly define multiscale heterogeneities and facies that would be difficult or impossible to observe with logging data analysis or geological description alone. The established relationships make it possible to partially replace the semi-destructive scratch test with non-destructive optical scanning, providing UCS estimation. One more important outcome of the present work is the lessons learned regarding how to organize future works. The integration of thermal core profiling and scratch testing data looks promising for unconventional reservoir characterization.

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Investigation of Bazhenov formation using thermal core logging technique

Cited by 7 publications

References 0 publications

Enhanced Oil Recovery Method Selection for Shale Oil Based on Numerical Simulations

Enhanced Oil Recovery Method Selection for Shale Oil Based on Numerical Simulations

Results of Combined Investigations of Domanic Formation with Continuous Thermal Core Profiling

Integration of Thermal Core Profiling and Scratch Testing for the Study of Unconventional Reservoirs

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