The Experts below are selected from a list of 12483 Experts worldwide ranked by ideXlab platform

Jingchen Zhang - One of the best experts on this subject based on the ideXlab platform.

  • numerical simulation of hydraulic fracturing Coalbed Methane reservoir
    Fuel, 2014
    Co-Authors: Jingchen Zhang
    Abstract:

    Abstract Some coal seam is well known for its three low characteristics: low permeability, low reservoir pressure and low gas saturation. Thus stimulation measures must be taken during Coalbed Methane development stage to enhance its recovery. Hydraulic fracturing transformation technology is an effective method for increasing Coalbed Methane production. This paper presents a two-phase, 3D flow and hydraulic fracturing model of dual-porosity media based on the theories of oil–gas geology and mechanics of flow through porous media. Correspondingly, a finite difference numerical model has been developed and applied successfully to a Coalbed Methane reservoir. Well test data from one western China basin is utilized for simulation. Results show that hydraulic fracturing promotes desorption and diffusion of Coalbed Methane which in turn substantially increases production of Coalbed Methane.

Shaobo Liu - One of the best experts on this subject based on the ideXlab platform.

  • Coalbed Methane reservoir boundaries and sealing mechanism
    Chinese Science Bulletin, 2005
    Co-Authors: Xiaoying Lin, Shaobo Liu, Yan Song
    Abstract:

    It is important to investigate the Coalbed Methane reservoir boundaries for the classification, exploration, and development of the Coalbed Methane reservoir. Based on the investigation of the typical Coalbed Methane reservoirs in the world, the boundaries can be divided into four types: hydrodynamic boundary, air altered boundary, permeability boundary, and fault boundary. Hydrodynamic and air altered boundaries are ubiquitous boundaries for every Coalbed Methane reservoir. The four types of the fault sealing mechanism in the petroleum geological investigation (diagenesis, clay smear, juxtaposition and cataclasis) are applied to the fault boundary of the Coalbed Methane reservoir. The sealing mechanism of the open fault boundary is the same with that of the hydrodynamic sealing boundary. The sealing mechanism of the permeability boundary is firstly classified into capillary pressure sealing and hydrocarbon concentration sealing. There are different controlling boundaries in Coalbed Methane reservoirs that are in different geological backgrounds. Therefore, the Coalbed Methane reservoir is diversiform.

  • Influence of overpressure on Coalbed Methane reservoir in south Qinshui basin
    Chinese Science Bulletin, 2005
    Co-Authors: Shaobo Liu, Yan Song, Menjun Zhao
    Abstract:

    In theory, from the high temperature and pressure during the coal generating gas to the present low temperature and pressure of Coalbed Methane reservoir, the accumulation of Coalbed Methane was from oversaturated to undersaturated. The gas content of the Coalbed Methane reservoir in the south Qinshui basin was 12–35.7 m3/t. According to the isotherm and measured gas content of No. 3 coal, the adsorbed gas content in some wells was highly saturated and oversaturated, which was hard to theoretically understand. In addition, there were no thermogenic and biogenic gases at the late stage in the south Qinshui basin. This article proposed that the overpressure was the main reason for the present high saturation of the Coalbed Methane reservoir. In early Cretaceous, the Coalbed Methane reservoir was characterized by overpressure and high saturation caused by gas generation from coal measure source rocks. In late Cretaceous, the Coalbed Methane reservoir was rapidly uplifted, and with the temperature and pressure decreasing, the pressure condition of adsorbed gas changed from overpressure to normal-under pressure, which resulted in the high saturation and gas content in the present Coalbed Methane reservoir.

  • The upper Paleozoic Coalbed Methane system in the Qinshui basin, China
    AAPG Bulletin, 2005
    Co-Authors: Xiaoying Lin, Yan Song, Mengjun Zhao, Shaobo Liu
    Abstract:

    The Coalbed Methane resource is very abundant in Qinshui basin (3.28 1012 m3; 114 tcf). The investigation on the upper Paleozoic Coalbed Methane system is a guide to the exploration and development of Coalbed Methane. The upper Paleozoic Coalbed Methane system in the Qinshui basin is sealed by a low-permeability roof and floor strata comprising mudstone, siltstone, and bauxite of the Carboniferous Benxi Formation and the Permian Shanxi and Xiashihezi formations. The overburden is the Lower Permian Xiashihezi Formation and the Upper Permian, Triassic, and Middle Jurassic clastic deposits. The source and reservoir rocks are the Carboniferous–Permian coal seams. The hydrocarbon generation of the source rocks reached its first peak in the Late Triassic. The highest maturity was about Ro = 1.2% under a normal paleogeothermal gradient (2–3C/100 m; 1.1–1.7F/100 ft). A tectonic thermal event during the Jurassic and Cretaceous Yanshanian orogeny enhanced the coal maturity and caused a second peak of hydrocarbon generation. Varying igneous intrusions caused the coal maturity to be higher in the southern, northern, and eastern parts of the Qinshui basin instead of the central and western parts. The highest maturity was greater than Ro = 4% in the Jincheng area. The migrated thermogenetic Coalbed Methane accumulated in the reservoirs in which abnormally high reservoir pressure exists locally under the hydrodynamic drive. Because of the different hydrodynamic background and sealing condition, the distribution of Coalbed Methane content is inhomogeneous. The reservoir is undersaturated with gas in most areas. Based on the Coalbed Methane system investigation, we assessed the Coalbed Methane producibility in different parts of the Qinshui basin, and the major producibility area is in the southern part of the basin.

Wang Hongyan - One of the best experts on this subject based on the ideXlab platform.

  • Pool‐Forming Stages and Enrichment Models of Medium‐ to High‐Rank Coalbed Methane
    Acta Geologica Sinica - English Edition, 2010
    Co-Authors: Song Yan, Zhao Meng-jun, Hong Feng, Liu Shaobo, Qin Sheng-fei, Wang Hongyan
    Abstract:

    : The pool-forming mechanism of Coalbed Methane has its own characteristics. In this paper, based on studies on the typical coal-bearing basins in China, it is pointed out that the reservoir formation of medium- to high-rank Coalbed Methane has experienced three critical stages: the Coalbed Methane generation and adsorption stage, the Coalbed adsorption capacity enhancement stage, and the Coalbed Methane desorption-diffusion and preservation stage. The regional tectonic evolution, hydrodynamic conditions and sealing conditions play important roles in the stage of Coalbed Methane desorption-diffusion and preservation. Medium- to high-rank Coalbed Methane has three types of enrichment models, that is, the most favorable, the relatively favorable, and the unfavorable enrichment models.

  • Geological characteristics of low rank Coalbed Methane, China
    Petroleum Exploration and Development, 2009
    Co-Authors: Wang Hongyan, Liu Honglin, Li Guizhong, Ma Jingzhang
    Abstract:

    Abstract Low rank Coalbed Methane is a very important and potential field of Coalbed Methane exploration and exploitation in China. The geological structure backgrounds of coal-bearing basins are complicated, and many Coalbeds are reconstructed by multiperiod and multiproperty structures and combinations, as well as stress-strain. The accumulation and enrichment of Coalbed Methane have the following characteristics: big thickness, multiple beds, low gas content, preferable permeability, great resource, and abundance. The thick and widely distributed Coalbeds and huge coal resources offset the shortcoming of low gas content, probably leading to the good prospect of exploration and exploitation. Matrix shrinkage effect induced by desorption causes high permeability in exploitation of low rank Coalbed Methane reservoirs, which is good for Coalbed Methane exploitation, and prone to form industrial gas flow. Low rank Coalbed Methane reservoirs have a simple forming process, including one deposition and one adjustment. If the main controlling factors, such as structure, coal-forming environment, and hydrologic geology, are matched well, the enriched Coalbed Methane zone with high production would be formed.

  • DAMAGE OF ACTIVE GROUNDWATER TO Coalbed Methane RESERVOIRS AND ITS PHYSICAL SIMULATION
    Natural Gas Industry, 2007
    Co-Authors: Wang Hongyan
    Abstract:

    Research on hydrogeological conditions is relatively poor at present, though it is one of the critical factors influencing the accumulation of Coalbed Methane. Active groundwater can not only make the gas-bearing properties of coal seam poorer, but also lower the carbon isotope of Coalbed Methane. The damage of active groundwater to Coalbed Methane reservoirs is studied by using the simulation system type FY-Ⅱof Coalbed Methane reservoir. The simulation results show that active groundwater has negative effects on the accumulation of Coalbed Methane and is unfavorable for the preservation of Coalbed Methane, while stagnant zone of groundwater is favorable for the exploration of Coalbed Methane reservoirs.

Eric Lichtfouse - One of the best experts on this subject based on the ideXlab platform.

  • CO_2 capture from Coalbed Methane using membranes: a review
    Environmental Chemistry Letters, 2020
    Co-Authors: Na Zhang, Zhen Pan, Zhien Zhang, Francisco M. Baena-moreno, Wenxiang Zhang, Li Zhang, Eric Lichtfouse
    Abstract:

    Coalbed Methane is an abundant form of natural gas extracted from coal beds. Coalbed Methane is viewed as a cleaner energy source versus petroleum and coal combustion because Methane extraction, transport and use are more efficient and less polluting. However, Coalbed Methane contains high amounts of CO_2 that induce solidification during liquefaction. Therefore, CO_2 has to be reduced below 2% to meet the pipeline transportation standards. In addition, CO_2 capture would reduce the amount of gas emissions to the atmosphere, thus mitigating global warming. Here, we review membrane absorption, which is an advanced method for CO_2 capture from Coalbed Methane, by controlling the gas and liquid phases separately during the operation process. We compare CO_2 removal methods for various Coalbed Methane sources. Parameters influencing CO_2 removal by membrane absorption are discussed to conclude that CO_2 capture efficiency is improved by increasing the flow rate, temperature, and absorbent concentration, reducing the gas flow rate, and selecting a mixed absorbent. We also explain the principles, processes and applications of CO_2 membrane absorption.

  • CO2 capture from Coalbed Methane using membranes: a review
    Environmental Chemistry Letters, 2019
    Co-Authors: Na Zhang, Zhen Pan, Zhien Zhang, Francisco M. Baena-moreno, Wenxiang Zhang, Li Zhang, Eric Lichtfouse
    Abstract:

    Coalbed Methane is an abundant form of natural gas extracted from coal beds. Coalbed Methane is viewed as a cleaner energy source versus petroleum and coal combustion because Methane extraction, transport and use are more efficient and less polluting. However, Coalbed Methane contains high amounts of CO2 that induce solidification during liquefaction. Therefore, CO2 has to be reduced below 2% to meet the pipeline transportation standards. In addition, CO2 capture would reduce the amount of gas emissions to the atmosphere, thus mitigating global warming. Here, we review membrane absorption, which is an advanced method for CO2 capture from Coalbed Methane, by controlling the gas and liquid phases separately during the operation process. We compare CO2 removal methods for various Coalbed Methane sources. Parameters influencing CO2 removal by membrane absorption are discussed to conclude that CO2 capture efficiency is improved by increasing the flow rate, temperature, and absorbent concentration, reducing the gas flow rate, and selecting a mixed absorbent. We also explain the principles, processes and applications of CO2 membrane absorption.

Sdic Xinji - One of the best experts on this subject based on the ideXlab platform.

  • APLICATION OF Coalbed Methane RESERVOIR SIMULATION
    Natural Gas Geoscience, 2004
    Co-Authors: Wang Xiao-mei, Sdic Xinji
    Abstract:

    Coalbed Methane reservoir simulation is the method currently available to determine operating strategies and estimate ultimate field recovery. Reservoir simulation follows the steps in performing a conventional reservoir simulation study. These steps involve selecting simulator, establishing simulation model, performing sensitivity analyses, adjusting history matching parameters and forcasting production. Coalbed Methane is an unconventional natural gas. Based on the geology model of desorption-diffusion-Darcy flow,Coalbed Methane reservoir simulation has its own characters. Systemic reservoir simulation has been performed in Xinji test area of Coalbed Methane. The establishment of simulation model and history matching have been emphasized in the article. Simulating Coalbed Methane reservoirs is based on the establishment of simulation model, in Xinji test area which consists of determining the area of simulation and boundary conditions,designing the simulation grid, handling fluid PVT data,reservoir description data and recurrent data and so on. History matching is the process of calibrating a simulation model to past performance of wells. By history matching a reservoir model that describes the real reservoir has been created in Xinji test area. Whether the thick sandstone adjacent to No. 5 and 6 coal seam contributes to gas production is analysed. Then suggests aimed to the behavior of the production wells has been put forward. At last the history match data has been used to predict production rates of wells.