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OALib Journal期刊
ISSN: 2333-9721
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“三软”煤层注水压裂增透机理及瓦斯抽采施工参数确定
Keywords: &ldquo,三软&rdquo,煤层,水力压裂,流&mdash,固耦合,瓦斯抽采
Abstract:
？针对豫西“三软”煤矿区瓦斯低渗难抽问题的特殊性，探讨了主采二1煤层生、储气层的变形特征。以abaqus软件为平台，依托告成煤矿建立了滑动构造带三维非线性流—固耦合水力压裂模型。应用多参数耦合模拟方法，探讨了定向注水压裂过程中目标层的流变—损伤—渗流耦合行为;同时利用t—p损伤演化准则的cohesive单元，模拟了目标层裂隙的起裂和扩展过程。此外，探讨了煤岩体对动力荷载的响应机制和动态条件下的压裂效果。研究结果表明，定向注水新工艺条件下，当注水压力为4.5mpa，注水时间在2h左右时，水力压裂在顺层软煤中的影响半径基本可以达到80～100m这一理想数据，从而大幅度地改善了“三软”煤层低渗性能。实践证明，采用正确的施工方法和技术参数优化组合，可以有效提高煤层的透气性和瓦斯抽采效果，对复杂矿区瓦斯综合利用具有重要借鉴意义。
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