The Influence of Interlayer on the Development of Steam Chamber in Steam Stimulation during Heavy Oil Recovery

Fan, Haiming; Fan, Tingen; Deng, J. K.; Zhang, Lijun; Zheng, Wei; Chen, Lifeng; Ge, Zongyuan; Xie, Haojun; Xu, Linzhi

doi:10.3390/pr11061742

Cited by 3 publications

(3 citation statements)

References 36 publications

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“…The fluid mostly consists of liquid and gas. The volume change of the liquid can be obtained from Equation (1) and the volume change of the gas can be obtained from the equation of state as follows [32]:…”

Section: Apb-prediction Modelmentioning

confidence: 99%

“…With the increase in drilling depth and the exploitation of offshore oil and gas, the problem of high-temperature well production is becoming more and more prominent. As an unconventional fossil resource produced by high-temperature wells, heavy oil is considered to be a significant source of world oil and gas growth [1]. In Bohai Bay, China, 50.4% of total offshore oil reserves are heavy oil [2].…”

Section: Introductionmentioning

confidence: 99%

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Study on Casing Safety Evaluation in High-Temperature Wells with Annular Pressure Buildup

et al. 2023

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In high-temperature wells, annular pressure buildup (APB) caused by temperature increase is a widespread phenomenon in production, especially in offshore thermal recovery wells. It increases the load on the tubing and casing and consequently threatens the wellbore integrity. Hence, research on casing safety evaluation and APB management has great significance for field production. In this paper, the tubing and casing safety evaluation and APB limit determination methods are presented considering the effect of thermal stress and APB. Based on the case study of an offshore thermal recovery well, an APB-management chart and the recommended optimal range of APB are provided. Finally, an analysis of three commonly used mitigation methods is presented. The effect and the recommended parameters of these mitigation methods are further discussed. The research results show that the thermal stress and APB phenomena affect the stress distribution of the casing and may bring great danger to the wellbore integrity. Maintaining the APB in the safety range is necessary for field production. It is recommended that the annular pressure be kept below the critical value given in this paper. Injecting nitrogen in annulus A and installing rupture disks are both effective methods to improve casing safety. In the case study, the APB decrease percentage is more than 75% when nitrogen is injected in annulus A. However, the nitrogen pressure, the rupture pressure and the installation depth of the rupture disk need to be determined via casing safety evaluation. The effect of optimizing the steel grade and thickness of the tubing and casing is not significant. They can be used as assistance methods when other mitigation methods are adopted.

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Section: Apb-prediction Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Casing Safety Evaluation in High-Temperature Wells with Annular Pressure Buildup

et al. 2023

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“…[7]. The cyclic steam injection method (CSS), also known as steam huff and puff, originated in the Maracaibo Lake Oilfield in Venezuela [8]. CSS has been widely used in oilfields in North America and the Liaohe Oilfield in China.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Stabilization Mechanism of Three-Phase Foam: Improving Heavy Oil Recovery via Steam Stimulation through Two-Dimensional Visual Model

Wu,

Lun,

Tang

et al. 2023

Processes

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There is a problem of a rapid decline in production caused by the repeated heating of the near-wellbore zone during steam stimulation. Finding a suitable foam system to expand the area of the steam chamber and slow down the rapid production of hot water during the recovery process can effectively improve the effect of steam stimulation. In this paper, CGS foam was prepared with high-temperature-resistant surfactant GD, graphite particles, and clay particles. Through the study of foam properties, it was found that with the addition of particles, the strength of the foam’s liquid film, half-life time, and temperature resistance was greatly improved. The appropriate permeability of the CGS foam and the movement characteristics of it in formations with different permeabilities were studied through a plugging experiment with a sand pack. The plugging performances of the GD foam, CGS foam, and pure particles in a simulated reservoir were compared. The development of the steam cavity during the steam stimulation process and the influence of injecting GD foam and CGS foam on the flow in the simulated reservoir were studied through a two-dimensional visualization model. The temperature resistance and stability of the CGS foam were better than those of GD foam in the simulated formation.

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Research on heat distribution and heat efficiency improvement in the middle and late stages of SAGD

He,

Zhang,

Luo

et al. 2024

J. Phys.: Conf. Ser.

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Challenges faced in heavy oil development include low efficiency in heat utilization and high energy consumption. Numerical simulation methods were employed to study the thermal distribution and clarify the thermal evolution law during the middle and later stages of SAGD, aiming to enhance heat utilization efficiency. Furthermore, the impacts of reservoir conditions and nitrogen injection on thermal distribution in the intermediate-to-late stages of SAGD were investigated. The research results indicate that in the intermediate-to-late stages of SAGD development, the proportion of heat loss gradually increases, while the proportion of heat absorbed by the reservoir decreases. By the later stage of SAGD, the thermal distribution is basically stable, with the reservoir absorbing only 35%-40% of the heat, the cap rock heat loss accounting for about 30%, and the heat carried by the output fluid comprising approximately 30%. Besides, an increase in permeability and reservoir thickness in reservoir conditions leads to an increase in the proportion of heat absorbed by the reservoir. Additionally, injecting nitrogen during the middle stage of SAGD can reduce heat loss in the later stage and increase the proportion of heat absorbed by the reservoir.

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The Influence of Interlayer on the Development of Steam Chamber in Steam Stimulation during Heavy Oil Recovery

Cited by 3 publications

References 36 publications

Study on Casing Safety Evaluation in High-Temperature Wells with Annular Pressure Buildup

Study on Casing Safety Evaluation in High-Temperature Wells with Annular Pressure Buildup

Characteristics and Stabilization Mechanism of Three-Phase Foam: Improving Heavy Oil Recovery via Steam Stimulation through Two-Dimensional Visual Model

Research on heat distribution and heat efficiency improvement in the middle and late stages of SAGD

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