< p >取心是一个重要的方法来获取详细信息形成,然而,这是非常耗时和便秘的,所以只有当储层地质学家和工程师需要高分辨率的数据应用。更常见的矿石勘探和采矿、测绘的基础设施和基础地质认识3-dimentional结构。湖泊沉积物用于< a href = " https://en.wikipedia.org/wiki/Varve " rel = " noreferrer " > < / >纹泥年表。海洋沉积物是空心了解海洋开发、日期事件坡过程和冰川作用和气候的变化。< a href = " http://www.antarcticglaciers.org/glaciers-and-climate/ice-cores/ice-core-basics/ " rel = " noreferrer " >冰是空心< / >来测量大气中了解过去的气候变化和火山作用。< / p > < p >总之,地质学家取心是一个非常重要的工具,不仅在油田。更便宜,更快,替代取心是< a href = " http://petrowiki.org/Mud_logging " rel = " noreferrer " >泥浆录井< / >,在油田钻井时很常见的练习。< / p > < p > < em >所以核心从钻孔怎么走吗?< / em > < / p > < p >有一些不同的系统使用,根据岩石/沉积物和投资。< / p > < p >硬地层的深钻粉,一个< em > < a href = " https://www.researchgate.net/profile/Pavel_Talalay/publication/259099023/figure/fig14/AS: 287278490107921 @1445503937288 / Fig-23-Split-ring-core-lifters-for-conventional-prospecting-drilling-Source.png " rel = " noreferrer " >核心捕手< / > < / em > two-barrel系统中使用。 The corehead (the drill bit) is connected to the outer barrel, while the core is pushed into an inner barrel. The lower part of the inner barrel is called the shoe just above the drill. In the shoe, there is a core catcher that wedges between the barrel and the core. The core catcher is a split ring with a rough inside that holds the core. When you pull the core, it snaps off as the lower and upper shoe squeezes the catcher. The core catcher works somehow like an expansion anchor, but inverted, grabbing the core on the inside of the barrel rather than the wall on the outside. The inner barrel also protects the core from the rotating outer barrel. For softer sediments, the core catcher is made out of springs that close inwards as the core is pulled. It is sometimes called basket retainer and can be in metal or plastic.
For smaller gravity corer, there is a valve on top of the tube that is closed and the underpressure in the tube holds the core in place. Sometimes...
Check the linked pictures, they probably explain better how it works, but I couldn't find any good CC.
