上行含水钻孔精准测压新技术

New Technology of Precision Measuring Gas Pressure in Upstream Drilling with Water

针对目标煤层含水、渗水、顶板易破碎等复杂地质条件下真实瓦斯压力测定困难的现状,分析上行测压钻孔不同含水情况给测定结果造成的影响,发现若测压钻孔水量过大或出现塌孔,通过剔除水压得到的修正压力值将出现偏差,由此设计了以"高低位双测压管"测压技术及"两堵一注"快速注浆封孔装置的为核心测压体系。经过分析研究,并在郑煤集团振兴二矿进行现场测试,结果表明:该测压体系能够有效排除钻孔含水、塌孔等现象对测压准确性的干扰,为准确测定复杂地质条件下煤层瓦斯压力提供了整套技术方法。

For the current situation of difficult gas pressure measurement under the complex geological conditions like coal moisture, water seepage, easily broken roof and so on, we analyze the influence of measurement results under different water seepage condition of up - pressure - drilling, and find that some drill holes have excessive water or collapsed, the revised pressure wilt have deviation by deleting water pressure. And thus We design the pressure measurement system that the core is the ＂ high - low double piezometer tubes＂ and the supporting corresponding rapid grouting hole sealing device. After the analysis and test in Zhenxing No. 2 Mine in Zhengzhou Coal Mine Group, the results shows that the pressure measurement system can effectively remove the accuracy of the gas pressure measurement influenced by the phenomena of borehole moistt^re, borehole collapse, and provide a complete set of technical methods of the accurate coal seam ~as oressure measurement under the complicated geological conditions.