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查明煤层气垂直井产能的地质主控因素是较准确产能预测、资源评价的基础。根据恩村井田勘探、试井、压裂、排采阶段的资料,对煤层气开发区块内煤储层原始渗透率、含气性、水平最小与最大主应力、煤层气井平均日产水量等进行了系统分析;利用模拟软件模拟比较了在其它地质参数不变的情况下,仅改变某一参数引起的产能差异。结果表明:在产水量相对较小的地区,水平最小主应力、原始渗透率的大小对产能影响最大;产水量相对较大地区,原始储层渗透率、排液对产能影响最大,而其他参数对产能的影响不大。目前恩村区块煤层气垂直井排采的结果充分说明上述结论的正确性。
The main geologic factors for determining CBM vertical well productivity are the basis for more accurate capacity prediction and resource assessment. Based on the data of the exploration, well testing, fracturing and drainage in Enmura Minefield, the initial permeability, gas content, minimum and maximum principal stress, average daily production of coalbed methane wells, etc. in the CBM development block The system analysis was made. The simulation software was used to simulate the productivity difference caused by changing only one parameter under the condition of other geologic parameters unchanged. The results show that in the areas with relatively small water production, the minimum horizontal principal stress and the original permeability have the greatest impact on the productivity. In the areas with relatively large water production, the permeability and discharge of the original reservoir have the greatest impact on productivity while the other parameters Little effect on capacity. At present, the results of the vertical coalbed methane drainage in Encun block fully illustrate the correctness of the above conclusion.