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发明公开
CN104847333A 煤层瓦斯抽采半径测定方法 无效 - 驳回

煤层瓦斯抽采半径测定方法
摘要：
本发明公开了一种煤层瓦斯抽采半径测定方法，包括以下步骤：在需要测定抽采半径地点钻出注气钻孔；在所述注气钻孔周围钻出多个测试孔且各测试孔与注气钻孔之间的孔心距均不相同；抽采各个测试孔内的气体并取样分析抽采出气体的成分；向所述注气钻孔中注入标样气体；再次抽采各个测试孔内的气体并取样分析该气体的成分；根据各测试孔内抽采出的测试气体的成分变化，判定煤层瓦斯抽采半径，本发明能够准确地测定煤层瓦斯抽放半径，避免钻孔设计及施工的盲目性。
摘要（英）：

The invention discloses a determination method for coal bed gas extraction radius. The determination method for coal bed gas extraction radius comprises the following steps: drilling gas injection drill hole at the place needing to measure extraction radius; drilling a plurality of test holes around the gas injection drill hole, the hole centre distance between each test hole and the gas injection drill hole is unequal; extracting gas in each test hole and sampling and analyzing the components of the extracted gas; injecting sample gas in the gas injection drill hole; extracting the gas in each test hole, sampling and analyzing the components of the extracted gas; judging coal bed gas extraction radius according to the change of the components of the extracted gas; the determination method for coal bed gas extraction radius can accurately measure coal bed gas extraction radius and can avoid drilling design and construction blindness.

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