常村井田煤层气井排采储层类型划分及意义
Classification of drainage and extraction reservoir types for coalbed methane wells in Changcun coalfield
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摘要: 准确划分煤层气井的排采储层类型能为排采过程压力传播研究奠定基础。以常村井田的3#煤层为研究对象，分析并选取了排采过程中影响煤储层的导流能力强弱和围岩的补给能力大小的主要参数，提出了获取这些参数的方法，确定了临界值；根据这些参数将研究区划分为4种排采储层类型，通过现场煤层气井的产水、产气情况验证了理论的可靠性，并讨论了排采储层类型划分的意义。结果表明：研究区可划分为高导流弱补给储层、高导流强补给储层、低导流弱补给储层和低导流强补给储层；高导流弱补给储层最有利于降低煤储层压力，表现出产水量小、见套压时间短的特点；低导流强补给储层表现出产水量大、见套压时间长的特点。Abstract: Accurate classification of drainage and extraction reservoir types of coalbed methane wells can lay a foundation for the study of pressure propagation in drainage process. Taking 3# coal seam of Changcun Mine Field as the research object, the main parameters affecting the conductivity of coal reservoir and the recharge capacity of surrounding rock in the process of drainage and extraction are analyzed and selected. The method of obtaining these parameters is proposed, and the critical value is determined. The study area is divided into four types of drainage reservoirs. The water production and gas production of CBM wells in the field verify the reliability of the theory. The significance of classification of drainage and extraction reservoir types was discussed. The results show that the study area can be divided into high-conductivity weak supply reservoir, high-conductivity strong supply reservoir, low-conductivity weak supply reservoir and low-conductivity strong supply reservoir. Among them, the high conductivity and weak recharge reservoir is most conducive to reduce coal reservoir pressure, showing the characteristics of small water production and short casing pressure time. The low conductivity and strong recharge reservoir shows the characteristics of large water production and long casing pressure time.
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