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井壁取芯是煤田测井工作重要的验证手段之一。特别是在煤层与顶底板围岩物性差异不大,电性反映不好的矿区,用于煤层定性或层厚控制的井壁取芯工作量都将大大增多。以往使用的井壁取芯器,包括上海地质仪器厂生产的JQX—1型和各野外队自制的取芯器,外径均大于55毫米。炮体是棱面形,且大多数类型的炮体是固定在一个柱体上的。这样的取芯器即使在75毫米口径钻孔中使用都极不
Core coring is one of the important verification methods in coalfield logging. Especially in the coal seam and the roof and floor rocks of little difference between the physical properties of the electrical reflection is not good, for qualitative or thickness control of the coal seam wall core coring workload will be greatly increased. Previous wall core wrecker, including the Shanghai Geological Instrument Factory production JQX-1-type and each field team-made core wipers, the outer diameter is greater than 55 mm. Barrels are prismatic, and most types of gun are fixed to a cylinder. Such coring devices are extremely low even for use in 75 mm bore holes