| 矿用随钻动态方位伽马仪器的研制与应用 |
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| 引用本文： | 陈龙,陈刚,张冀冠.矿用随钻动态方位伽马仪器的研制与应用[J].煤田地质与勘探,2022,50(1):86-91. |
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| 作者姓名： | 陈龙 陈刚 张冀冠 |
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| 作者单位： | 中煤科工集团西安研究院有限公司,陕西 西安 710077 |
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| 基金项目： | 陕西省重点研发计划项目(2020GY-089);中煤科工集团西安研究院有限公司科技创新基金项目(2020XAYDC01)。 |
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| 摘 要： | 顺煤层瓦斯抽采钻孔是目前最直接最有效的瓦斯治理方法，自然伽马作为含煤地层识别常用的判识依据，可以根据地层放射性判断钻孔轨迹是否在目标层中。但现有的矿用伽马测井仪器只能进行滑动钻进测量，不适用于复合钻进及旋转导向钻进，无法满足伽马动态连续测量的工况。针对以上问题，在分析了煤矿井下随钻测量工况特点和伽马测井原理的基础上，通过低压直流载波双向通信技术进行孔底多扇区方位伽马数据的实时传输；采用屏蔽开窗的结构设计，实现单伽马晶体的8扇区分区测量；基于三轴MEMS加速度传感器和三轴MEMS陀螺仪不同的频率特性，采用互补滤波的动态测量方法，克服了回转钻进过程中振动和旋转对工具面向角测量的影响。通过地面性能测试和井下的工业性试验，验证了仪器在不同放射性地层分界面能正确反映出地层放射性变化规律。试验结果表明，仪器可以满足复合回转定向钻进时的地质导向测量要求，为煤矿井下顺煤层定向钻进提供了技术保障。
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| 关 键 词： | 方位伽马 随钻测井 地质导向 互补滤波 |
| 收稿时间： | 2021-10-31 |
Development and application of a mine-used dynamic azimuth gamma instrument while drilling |
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| CHEN Long,CHEN Gang,ZHANG Jiguan.Development and application of a mine-used dynamic azimuth gamma instrument while drilling[J].Coal Geology & Exploration,2022,50(1):86-91. |
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| Authors: | CHEN Long CHEN Gang ZHANG Jiguan |
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| Institution: | (Xi’an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi’an 710077,China) |
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| Abstract: | Gas drainage borehole along coal seams is the most direct and effective gas control method at present. As a common basis for identifying coal bearing formations, natural gamma can tell whether the borehole trajectory is in the target layer according to the formation radioactivity. However, the existing mine-used gamma logging tools can only carry out sliding drilling measurement, which are not applicable to compound drilling or rotary steering drilling, and cannot meet the working condition of continuous gamma dynamic measurement. On the basis of the analysis of the characteristics of the working conditions of MWD and the principle of gamma logging in coal mines, the real-time transmission of multi sector azimuth gamma data at the bottom of the hole is carried out by low-voltage DC carrier two-way communication technology. The 8-sector partition measurement of the single gamma crystal is realized through the structure design of shielding window. On the basis of the different frequency characteristics of the three-axis MEMS acceleration sensor and three-axis MEMS gyroscope, the dynamic measurement method of complementary filtering is adopted, which overcomes the influence of vibration and rotation on tool facing angle measurement in rotary drilling. Ground performance tests and underground industrial tests have verified that the instrument can correctly reflect the variation law of formation radioactivity at the interface of different radioactive formations. The test results show that the instrument can meet the requirements of geosteering measurement in compound rotary directional drilling, and provide technical support for directional drilling along coal seams in coal mines. |
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| Keywords: | dynamic azimuth gamma LWD geosteering complementary filtering |
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