Theoretical Study Of CBM Production In Mutiple Coal-Seam Wells

Xinjiang fukang mining area coal resources are rich,coalbed methane development in the industrialization degree is relatively high.Coal bearing strata in the region more concentrated in the western hills kiln and eight bay group,among which 38-45#coal seam in xishan kiln stable occurrence in western mining area,the main mining 45#coal seam;Eight bay 1-44#coal seam group development is rich,the main mining A2#?A3#?A4#?A5#?coal seams.In this dissertation,based on the collected a large number of geological exploration and production data,combining previous about the interference between us rank layer theory research,including mainly permeability,reservoir pressure,reservoir pressure gradient),gas content and gas saturation,reservoir parameters and coal seam dip Angle.Based on the ARI companies in the United States advanced CBM simulation software as the main technical means,geological data of single well geological model is set up by entering a fukang CSD01 mining area The model with control variable method for the principle,simulation combination under different permeability and big differences under the pressure of coalbed methane reservoir in layer mining capacity situation.Finally based on the actual reservoir exploration target well and layer mining capacity situation.Simulation experiment main conclusions are as follows:1)Involution layer permeability factors rank interlayer interference intensity is the strongest,restricting the fukang mining coal-bed methane layer of high rank of the primary factor.Through quantitative analysis found that when the permeability difference on two orders of magnitude,or layer of high rank technology adverse effect.2)Big difference between reservoir pressure close layer of high rank in comparison with the core of the gradient layer reservoir pressure in high rank difference is both before and after water rate and the pressure drop period are not synchronized,but the end of the decade the parameter convergence.But the end of the decade the parameter convergence,so big difference accumulation conditionsof commingled production capacity inhibition can be overcome through the deployment of high rank system.3)Big difference between reservoir pressure layer mining capacity advantages compared with single row cannot single factor analysis conclusion,comprehensive analysis should be combined with the permeability parameters.Experiments show that permeability will there is a critical value,make lower than some of the interval reflects the close layer mining production superiority.4)Fukang mining area for specific production Wells and layers of high rank,according to the main controlling factors for specific analysis.Considering the coal reservoir heterogeneity and anisotropy,the big area of layer of high rank evaluation standard can not be popularized.