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一、绳索取心钻杆结垢原因（一）结垢的物质因素1．结垢物质成分、粒度分布为了解钻杆内壁所结泥垢的物质成分，对从现场采集到的钻杆垢、粘土、离心除泥器废砂和岩心作了吸兰量测定和粒度分布测定，结果见表1。由表1可知钻杆垢和离心除泥器所清除的废砂的吸兰量都很小，与相近岩石的吸兰量接近，而远远小于造浆用高阳土的吸兰量。这就说明钻杆垢和离心除泥器所消除的废砂绝大部分都是无用钻屑颗粒，而不含有用粘土成分。
First, the rope coring drill stem fouling reasons (a) scaling of the material factors 1. Fouling material composition, particle size distribution In order to understand the substance composition of the mud on the inner wall of the drill pipe, the determination of the absorption capacity and the particle size distribution of drill stem scale, clay, centrifugal mud remover waste sand and core collected from the site were carried out. The results are shown in Table 1. It can be seen from Table 1 that the absorbed amount of waste sand removed by drill stem scale and centrifugal desilter is very small, which is close to the absorbed amount of the similar rock and much smaller than the absorbed amount of sunshine of the slurry making. This shows that most of the waste sand removed by drill pipe scale and centrifugal desilter is useless cuttings particles, but not clay content.