The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform

V. K. Boutkan - One of the best experts on this subject based on the ideXlab platform.

  • Carbon dioxide disposal from coal-based IGCC's in depleted gas fields
    Energy Conversion and Management, 1992
    Co-Authors: M. J. Van Der Burgt, J. Cantle, V. K. Boutkan
    Abstract:

    The technical feasibility and consequences of carbon dioxide disposal from coal-based, combined cycle power stations in small and large depleted gas fields in the Netherlands was investigated. Synthesis gas is derived using the Shell Coal Gasification Process, followed by (shift) conversion to carbon dioxide and hydrogen. Carbon dioxide is separated and transported to the gas field by pipeline for underground storage. Hydrogen is used as fuel for power generation in a combined cycle. The proposed scheme offers a 94% reduction in carbon dioxide emissions. The overall thermal efficiency of the scheme is 33% vs 43% for a power station without CO2disposal. The injection of CO2may result in some additional production of natural gas. The total capital for the power station, pipeline and injection is about 50% higher than for a similar power station without CO2sequestering. The electricity costs increases by 40%. With regard to technical subsurface aspects, the injection into gas fields is a safe and secure way to dispose of carbon dioxide, as long as the Initial Reservoir Pressure is not exceeded. In this way, cap rock integrity can be guaranteed. Escape of carbon dioxide to the atmosphere through leaking wells is unlikely if the wells are properly abandoned at the end of the project. © 1992.

Kun Feng - One of the best experts on this subject based on the ideXlab platform.

  • development of material balance equations for coalbed methane Reservoirs considering dewatering process gas solubility pore compressibility and matrix shrinkage
    International Journal of Coal Geology, 2018
    Co-Authors: Yucui Chang, Shigui Wu, Xianyue Xiong, Kun Feng
    Abstract:

    Abstract As one of the important unconventional resources, coalbed methane (CBM) can mitigate energy shortage issue, and its efficient exploitation has received widespread attention globally. The development of CBM is of great significance to coal mine safety and energy supply. CBM reserve evaluation provides a basis for selecting development zones and determining development strategies. However, most existing CBM reserve evaluation methods do not consider the effects of dissolved gas, free gas and the difference between Initial Reservoir Pressure and critical desorption Pressure. Thus, the predicted results usually deviate from the actual reserve. In this paper, firstly, the material balance equation (MBE) for early dewatering stage considering the effect of stress sensitivity on porosity is established, and the Initial free gas and dissolved gas reserves of undersaturated CBM Reservoirs can be obtained. Secondly, the MBE for gas desorption stage is derived, in which the effects of stress sensitivity, matrix shrinkage and dissolved gas are considered. So the original gas in place (OGIP) of CBM Reservoirs can be solved. Next, the correctness and rationality of MBEs for early dewatering stage and gas desorption stage are verified against King's MBE method and CBM dynamic analysis software. Finally, this method is applied to actual production wells. The results show that in early dewatering stage, 1 − S wi α c p + α S wi c w p ¯ Z ¯ − p i − p ¯ p ¯ Z ¯ and W p B w − W e α p ¯ Z ¯ + G p p sc T Z sc T sc have a linear shape, and the control area of CBM Reservoir can be calculated based on the slope of the straight line. In addition, the ratio of the intercept to the slope of the straight line can be used to calculate the Initial free gas and dissolved gas reserves of undersaturated CBM Reservoirs. During gas desorption stage, p/Z* and Gp have a linear relationship. OGIP of CBM Reservoirs can be obtained by the ratio of y-intercept to the slope of the straight line. Using gas and water production data provided by CBM dynamic analysis software, the reserves of undersaturated CBM Reservoirs evaluated by the proposed method are in good agreement with those from CBM dynamic analysis software, which proves that the proposed material balance equations and corresponding methods are reasonable and reliable. The material balance equations and methods presented in this paper take into account the effects of various factors such as the difference between Initial Reservoir Pressure and critical desorption Pressure, pore compressibility, water compressibility, coal matrix shrinkage, dissolved gas, and free gas. The proposed reserve calculation methods for undersaturated CBM Reservoirs can provide an important basis for selecting dominant production area, determining well spacing and guiding development policy.

M. J. Van Der Burgt - One of the best experts on this subject based on the ideXlab platform.

  • Carbon dioxide disposal from coal-based IGCC's in depleted gas fields
    Energy Conversion and Management, 1992
    Co-Authors: M. J. Van Der Burgt, J. Cantle, V. K. Boutkan
    Abstract:

    The technical feasibility and consequences of carbon dioxide disposal from coal-based, combined cycle power stations in small and large depleted gas fields in the Netherlands was investigated. Synthesis gas is derived using the Shell Coal Gasification Process, followed by (shift) conversion to carbon dioxide and hydrogen. Carbon dioxide is separated and transported to the gas field by pipeline for underground storage. Hydrogen is used as fuel for power generation in a combined cycle. The proposed scheme offers a 94% reduction in carbon dioxide emissions. The overall thermal efficiency of the scheme is 33% vs 43% for a power station without CO2disposal. The injection of CO2may result in some additional production of natural gas. The total capital for the power station, pipeline and injection is about 50% higher than for a similar power station without CO2sequestering. The electricity costs increases by 40%. With regard to technical subsurface aspects, the injection into gas fields is a safe and secure way to dispose of carbon dioxide, as long as the Initial Reservoir Pressure is not exceeded. In this way, cap rock integrity can be guaranteed. Escape of carbon dioxide to the atmosphere through leaking wells is unlikely if the wells are properly abandoned at the end of the project. © 1992.

Yucui Chang - One of the best experts on this subject based on the ideXlab platform.

  • development of material balance equations for coalbed methane Reservoirs considering dewatering process gas solubility pore compressibility and matrix shrinkage
    International Journal of Coal Geology, 2018
    Co-Authors: Yucui Chang, Shigui Wu, Xianyue Xiong, Kun Feng
    Abstract:

    Abstract As one of the important unconventional resources, coalbed methane (CBM) can mitigate energy shortage issue, and its efficient exploitation has received widespread attention globally. The development of CBM is of great significance to coal mine safety and energy supply. CBM reserve evaluation provides a basis for selecting development zones and determining development strategies. However, most existing CBM reserve evaluation methods do not consider the effects of dissolved gas, free gas and the difference between Initial Reservoir Pressure and critical desorption Pressure. Thus, the predicted results usually deviate from the actual reserve. In this paper, firstly, the material balance equation (MBE) for early dewatering stage considering the effect of stress sensitivity on porosity is established, and the Initial free gas and dissolved gas reserves of undersaturated CBM Reservoirs can be obtained. Secondly, the MBE for gas desorption stage is derived, in which the effects of stress sensitivity, matrix shrinkage and dissolved gas are considered. So the original gas in place (OGIP) of CBM Reservoirs can be solved. Next, the correctness and rationality of MBEs for early dewatering stage and gas desorption stage are verified against King's MBE method and CBM dynamic analysis software. Finally, this method is applied to actual production wells. The results show that in early dewatering stage, 1 − S wi α c p + α S wi c w p ¯ Z ¯ − p i − p ¯ p ¯ Z ¯ and W p B w − W e α p ¯ Z ¯ + G p p sc T Z sc T sc have a linear shape, and the control area of CBM Reservoir can be calculated based on the slope of the straight line. In addition, the ratio of the intercept to the slope of the straight line can be used to calculate the Initial free gas and dissolved gas reserves of undersaturated CBM Reservoirs. During gas desorption stage, p/Z* and Gp have a linear relationship. OGIP of CBM Reservoirs can be obtained by the ratio of y-intercept to the slope of the straight line. Using gas and water production data provided by CBM dynamic analysis software, the reserves of undersaturated CBM Reservoirs evaluated by the proposed method are in good agreement with those from CBM dynamic analysis software, which proves that the proposed material balance equations and corresponding methods are reasonable and reliable. The material balance equations and methods presented in this paper take into account the effects of various factors such as the difference between Initial Reservoir Pressure and critical desorption Pressure, pore compressibility, water compressibility, coal matrix shrinkage, dissolved gas, and free gas. The proposed reserve calculation methods for undersaturated CBM Reservoirs can provide an important basis for selecting dominant production area, determining well spacing and guiding development policy.

J. Cantle - One of the best experts on this subject based on the ideXlab platform.

  • Carbon dioxide disposal from coal-based IGCC's in depleted gas fields
    Energy Conversion and Management, 1992
    Co-Authors: M. J. Van Der Burgt, J. Cantle, V. K. Boutkan
    Abstract:

    The technical feasibility and consequences of carbon dioxide disposal from coal-based, combined cycle power stations in small and large depleted gas fields in the Netherlands was investigated. Synthesis gas is derived using the Shell Coal Gasification Process, followed by (shift) conversion to carbon dioxide and hydrogen. Carbon dioxide is separated and transported to the gas field by pipeline for underground storage. Hydrogen is used as fuel for power generation in a combined cycle. The proposed scheme offers a 94% reduction in carbon dioxide emissions. The overall thermal efficiency of the scheme is 33% vs 43% for a power station without CO2disposal. The injection of CO2may result in some additional production of natural gas. The total capital for the power station, pipeline and injection is about 50% higher than for a similar power station without CO2sequestering. The electricity costs increases by 40%. With regard to technical subsurface aspects, the injection into gas fields is a safe and secure way to dispose of carbon dioxide, as long as the Initial Reservoir Pressure is not exceeded. In this way, cap rock integrity can be guaranteed. Escape of carbon dioxide to the atmosphere through leaking wells is unlikely if the wells are properly abandoned at the end of the project. © 1992.