The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Mingxing Bai - One of the best experts on this subject based on the ideXlab platform.
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Well Completion issues for underground gas storage in oil and gas reservoirs in china
Journal of Petroleum Science and Engineering, 2018Co-Authors: Mingxing Bai, Anqi Shen, Lingdong Meng, Jianjun Zhu, Kaoping SongAbstract:Abstract Underground Gas Storage (UGS) is considered a strategic method to balance the supply-demand chain of the energy required throughout a year and shave the peak demands during the winter time. This paper highlights international UGS distributions including ongoing UGS facilities in China, followed by a review of integrity issues such as fault reactivation and Well integrity. As guidance for Well design during UGS construction, the fundamental requirements for UGS Well Completion in an oil and gas reservoir in China are listed including those for newly drilled Wells and the use of old Wells. The technical and regulatory demands for newly drilled injection Wells need to consider the mechanical and chemical effects. For example, the corrosion problem of downhole equipment is a major challenge. By re-completing the old Wells with OHGP (Open-Hole Gravel Packs) the Well's performance could be improved significantly. The development of Well Completion technology for UGS in China are illustrated by comparing three Well Completion schemes in Dagang, Guxinzhuang, and Shuang 6 which are constructed in different time. It is found that the key technology including tubing selection, lost circulation control, subsurface safety valve, retrievable downhole packer, and formation damage prevention are some cutting-edge technologies that are matured enough compared to cement slurry selection in special formations, and the use of welded casing technology are still not quite developed.
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Well Completion and integrity evaluation for co2 injection Wells
Renewable & Sustainable Energy Reviews, 2015Co-Authors: Mingxing Bai, Kaoping Song, Jianpeng Sun, Zhi QiaoAbstract:Abstract Sequestration of CO 2 in depleted oil and gas reservoirs, coal seams and saline aquifers is one important means of mitigating greenhouse effect on the environment and enhancing oil and gas recovery. The collected CO 2 is injected via injection Wells into the underground space. Due to the characteristics of supercritical CO 2 , e.g., corrosive, low temperature, the Well design and Completion for CO 2 injection purposes requires more considerations. This paper introduces the basic challenges of designing a CO 2 injection Well, reviews the famous CO 2 injection cases around the world, and proposes Well Completion criteria, including Completion scheme design, materials selection and so on. Well integrity tests in use are reviewed and evaluated in terms of their pros and cons. Well integrity evaluation using numerical simulation is conducted as Well to study the influences of CO 2 injection on Well integrity in a pilot area in Germany. The results show that the materials selected for CO 2 injection Well shall adapt to the low-temperature environment, and the cement should have a high tensile strength and resist corrosion. Under the impact of salt rock creep, the cement cracks resulting from temperature decrease during injection tend to heal. At the end of the paper for the Wells with loss of integrity, a remedial work needs to be done, e.g., cement repair, and for this a thorough review of cement repair experiences is performed.
Abbas Zamani - One of the best experts on this subject based on the ideXlab platform.
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cement design for underground gas storage Well Completion
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Adib Shahvali, Reza Azin, Abbas ZamaniAbstract:In order to shave the peak demands during the cold seasons, underground gas storage (UGS), balancing the supply-demand chain throughout the year, has been accepted as a strategic method. During the successive UGS cycles, the Well cement experiences cyclic mechanical, thermal, and hydraulic stress and may crack due to its low elasticity and ductility. This could lead to the transmission of stored gas through cementing behind casing, one of the major challenges experienced in UGS operations, so posing high workover costs on UGS Wells. In addition to workover costs, the loss of inventory due to gas transmission makes the reservoir insufficient in proper gas supply during the high-demand season. In this work, a new formulation has been invented in order to prevent cement cracking, improve cement elasticity and ductility, and reduce the crack propagation in the cement used for Completion of UGS Well. The new formulation adds a polymer and an elastomer to cement composition. Results showed that addition of latex to cement decreases the density, hydration and fluid loss of cement; also, the rate of cement bonding decreases. On the other hand, addition of polypropylene fibers results in dramatic improvement of compressive strength and stress strain properties of the cement. In comparison with elastomer, this additive provides a higher threshold elasticity of cement. Also, the combined cohesive effect of latex and flexibility of microfibers brings about the best resistance against excessive pressures.
Adib Shahvali - One of the best experts on this subject based on the ideXlab platform.
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cement design for underground gas storage Well Completion
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Adib Shahvali, Reza Azin, Abbas ZamaniAbstract:In order to shave the peak demands during the cold seasons, underground gas storage (UGS), balancing the supply-demand chain throughout the year, has been accepted as a strategic method. During the successive UGS cycles, the Well cement experiences cyclic mechanical, thermal, and hydraulic stress and may crack due to its low elasticity and ductility. This could lead to the transmission of stored gas through cementing behind casing, one of the major challenges experienced in UGS operations, so posing high workover costs on UGS Wells. In addition to workover costs, the loss of inventory due to gas transmission makes the reservoir insufficient in proper gas supply during the high-demand season. In this work, a new formulation has been invented in order to prevent cement cracking, improve cement elasticity and ductility, and reduce the crack propagation in the cement used for Completion of UGS Well. The new formulation adds a polymer and an elastomer to cement composition. Results showed that addition of latex to cement decreases the density, hydration and fluid loss of cement; also, the rate of cement bonding decreases. On the other hand, addition of polypropylene fibers results in dramatic improvement of compressive strength and stress strain properties of the cement. In comparison with elastomer, this additive provides a higher threshold elasticity of cement. Also, the combined cohesive effect of latex and flexibility of microfibers brings about the best resistance against excessive pressures.
Kaoping Song - One of the best experts on this subject based on the ideXlab platform.
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Well Completion issues for underground gas storage in oil and gas reservoirs in china
Journal of Petroleum Science and Engineering, 2018Co-Authors: Mingxing Bai, Anqi Shen, Lingdong Meng, Jianjun Zhu, Kaoping SongAbstract:Abstract Underground Gas Storage (UGS) is considered a strategic method to balance the supply-demand chain of the energy required throughout a year and shave the peak demands during the winter time. This paper highlights international UGS distributions including ongoing UGS facilities in China, followed by a review of integrity issues such as fault reactivation and Well integrity. As guidance for Well design during UGS construction, the fundamental requirements for UGS Well Completion in an oil and gas reservoir in China are listed including those for newly drilled Wells and the use of old Wells. The technical and regulatory demands for newly drilled injection Wells need to consider the mechanical and chemical effects. For example, the corrosion problem of downhole equipment is a major challenge. By re-completing the old Wells with OHGP (Open-Hole Gravel Packs) the Well's performance could be improved significantly. The development of Well Completion technology for UGS in China are illustrated by comparing three Well Completion schemes in Dagang, Guxinzhuang, and Shuang 6 which are constructed in different time. It is found that the key technology including tubing selection, lost circulation control, subsurface safety valve, retrievable downhole packer, and formation damage prevention are some cutting-edge technologies that are matured enough compared to cement slurry selection in special formations, and the use of welded casing technology are still not quite developed.
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Well Completion and integrity evaluation for co2 injection Wells
Renewable & Sustainable Energy Reviews, 2015Co-Authors: Mingxing Bai, Kaoping Song, Jianpeng Sun, Zhi QiaoAbstract:Abstract Sequestration of CO 2 in depleted oil and gas reservoirs, coal seams and saline aquifers is one important means of mitigating greenhouse effect on the environment and enhancing oil and gas recovery. The collected CO 2 is injected via injection Wells into the underground space. Due to the characteristics of supercritical CO 2 , e.g., corrosive, low temperature, the Well design and Completion for CO 2 injection purposes requires more considerations. This paper introduces the basic challenges of designing a CO 2 injection Well, reviews the famous CO 2 injection cases around the world, and proposes Well Completion criteria, including Completion scheme design, materials selection and so on. Well integrity tests in use are reviewed and evaluated in terms of their pros and cons. Well integrity evaluation using numerical simulation is conducted as Well to study the influences of CO 2 injection on Well integrity in a pilot area in Germany. The results show that the materials selected for CO 2 injection Well shall adapt to the low-temperature environment, and the cement should have a high tensile strength and resist corrosion. Under the impact of salt rock creep, the cement cracks resulting from temperature decrease during injection tend to heal. At the end of the paper for the Wells with loss of integrity, a remedial work needs to be done, e.g., cement repair, and for this a thorough review of cement repair experiences is performed.
Reza Azin - One of the best experts on this subject based on the ideXlab platform.
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cement design for underground gas storage Well Completion
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Adib Shahvali, Reza Azin, Abbas ZamaniAbstract:In order to shave the peak demands during the cold seasons, underground gas storage (UGS), balancing the supply-demand chain throughout the year, has been accepted as a strategic method. During the successive UGS cycles, the Well cement experiences cyclic mechanical, thermal, and hydraulic stress and may crack due to its low elasticity and ductility. This could lead to the transmission of stored gas through cementing behind casing, one of the major challenges experienced in UGS operations, so posing high workover costs on UGS Wells. In addition to workover costs, the loss of inventory due to gas transmission makes the reservoir insufficient in proper gas supply during the high-demand season. In this work, a new formulation has been invented in order to prevent cement cracking, improve cement elasticity and ductility, and reduce the crack propagation in the cement used for Completion of UGS Well. The new formulation adds a polymer and an elastomer to cement composition. Results showed that addition of latex to cement decreases the density, hydration and fluid loss of cement; also, the rate of cement bonding decreases. On the other hand, addition of polypropylene fibers results in dramatic improvement of compressive strength and stress strain properties of the cement. In comparison with elastomer, this additive provides a higher threshold elasticity of cement. Also, the combined cohesive effect of latex and flexibility of microfibers brings about the best resistance against excessive pressures.
