九瑞矿集区岩心钻探问题研究
发布时间：2018-12-21 18:04
【摘要】：获得地质资料的一种重要手段就是岩心钻探。随着科学技术及国民经济的发展,岩心钻探的深度和孔径不断提高,面对的地质条件越发复杂,因而岩心钻探发生事故的概率增大,事故种类增多,同时事故复杂程度也日趋严重。九瑞矿集区是长江中下游地区多金属成矿带的重要组成部分。在九瑞矿集区岩心钻探施工中,容易发生岩心钻探事故的地层主要有松散破碎地层、软硬相间的偏斜地层、溶洞裂隙发育地层和深部坚硬打滑岩层四类地层。因此本文针对九瑞矿集区各种岩心钻探事故进行了总结和研究,获得的主要结论如下：(1)本文对九瑞矿集区常见的孔漏、孔斜和溶洞事故发生的地区地质特征、事故成因分类和预防处理方法进行了总结分析。同时指出在该地区进行岩心钻探时,采用绳索取心钻探工艺、预备多级口径绳索钻杆、同时辅以钠土泥浆进行钻进的方法,可以取得较好的钻进效率、减轻钻探工作强度,并能较好的预防上述事故的发生。(2)瑞昌坳下矿区灰岩分布广泛,在钻进施工时,除在浅部可能遇到溶洞外,还可能在深部遇到大型溶洞。而深大型溶洞事故处理较为困难,采用传统方法(如充填法和保护钻进法)进行钻进施工,经济或实施效果较差。(3)通过对钻穿深大型溶洞难点和技术要点的分析,本文探索采用了钠土泥浆堵漏、高标水泥固定位置、无氧焊接底部钻杆、双绳索取心钻杆交替钻进的方法进行了钻进施工,并成功实施。(4)瑞昌坳下矿区深部存在坚硬打滑岩层(坚硬花岗岩地层),在此地层中钻进会出现钻进效率低和钻头磨损严重的问题。而面对深部坚硬打滑岩层,不能以简单增加钻压提高摩擦力的方式来提高钻进效率,否则很容易出现各种事故(如钻头磨损严重、钻杆断裂和憋钻事故)。若只考虑到增加钻头工作层厚度的方法,其效果并不明显。(5)通过分析影响深部坚硬打滑岩层钻进的因素及相互关系,本文探索提出了一种新型钻头设计(综合考虑了钻压、钻头金刚石品质、胎体硬度、唇面形状、金刚石浓度和工作层厚度等因素),并成功实施。
[Abstract]:An important means of obtaining geological data is core drilling. With the development of science and technology and the development of national economy, the depth and aperture of core drilling are increasing, and the geological conditions are becoming more and more complicated. Therefore, the probability of accidents in core drilling increases and the types of accidents increase. At the same time, the complexity of the accident is becoming more and more serious. Jiurui ore concentration area is an important part of polymetallic metallogenic belt in the middle and lower reaches of the Yangtze River. In the core drilling construction of Jiurui Mine, the strata prone to core drilling accidents are mainly loose and broken strata, soft and hard oblique strata, cavern fracture formation and deep hard skid strata. Therefore, this paper summarizes and studies various core drilling accidents in Jiurui ore concentration area. The main conclusions are as follows: (1) the geological characteristics of the common hole leakage, sloping and cavern accidents in Jiurui ore concentration area are discussed in this paper. The causes of accidents are classified and the methods of prevention and treatment are summarized and analyzed. At the same time, it is pointed out that the drilling efficiency can be better and the working intensity of drilling can be reduced by using rope coring drilling technology, preparing multi-stage diameter rope drill pipe and drilling with sodium soil mud in the core drilling in this area. And it can prevent the occurrence of the above accidents. (2) Limestone is widely distributed in Ruichang depression. In drilling construction, it is possible to encounter large caverns in the deep as well as in the shallow part. However, it is difficult to deal with accidents in deep and large caverns. Traditional methods (such as filling method and protective drilling method) are used in drilling construction. (3) by analyzing the difficult points and technical points of drilling through deep large caverns, the economic or practical effect is poor. In this paper, the methods of sodium soil mud plugging, high standard cement fixed position, oxygen-free welding bottom drill pipe and double rope coring drill pipe alternately drilling are explored. (4) there are hard skid strata (hard granite formations) in the deep part of Ruichang Depression, so the drilling efficiency is low and the bit wear is serious. However, in the face of deep hard skid rock, the drilling efficiency can not be improved by simply increasing the drilling pressure and increasing the friction force, otherwise it is easy to occur various accidents (such as serious bit wear, drill pipe fracture and drill choking). If only the method of increasing the thickness of the working layer of the bit is considered, the effect is not obvious. (5) through the analysis of the factors affecting the drilling of the deep hard skid rock formation and the relationship between them, In this paper, a new type of bit design (including drilling pressure, bit diamond quality, matrix hardness, lip shape, diamond concentration and working layer thickness) is proposed and successfully implemented.
【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P634
，
本文编号：2389266
[Abstract]:An important means of obtaining geological data is core drilling. With the development of science and technology and the development of national economy, the depth and aperture of core drilling are increasing, and the geological conditions are becoming more and more complicated. Therefore, the probability of accidents in core drilling increases and the types of accidents increase. At the same time, the complexity of the accident is becoming more and more serious. Jiurui ore concentration area is an important part of polymetallic metallogenic belt in the middle and lower reaches of the Yangtze River. In the core drilling construction of Jiurui Mine, the strata prone to core drilling accidents are mainly loose and broken strata, soft and hard oblique strata, cavern fracture formation and deep hard skid strata. Therefore, this paper summarizes and studies various core drilling accidents in Jiurui ore concentration area. The main conclusions are as follows: (1) the geological characteristics of the common hole leakage, sloping and cavern accidents in Jiurui ore concentration area are discussed in this paper. The causes of accidents are classified and the methods of prevention and treatment are summarized and analyzed. At the same time, it is pointed out that the drilling efficiency can be better and the working intensity of drilling can be reduced by using rope coring drilling technology, preparing multi-stage diameter rope drill pipe and drilling with sodium soil mud in the core drilling in this area. And it can prevent the occurrence of the above accidents. (2) Limestone is widely distributed in Ruichang depression. In drilling construction, it is possible to encounter large caverns in the deep as well as in the shallow part. However, it is difficult to deal with accidents in deep and large caverns. Traditional methods (such as filling method and protective drilling method) are used in drilling construction. (3) by analyzing the difficult points and technical points of drilling through deep large caverns, the economic or practical effect is poor. In this paper, the methods of sodium soil mud plugging, high standard cement fixed position, oxygen-free welding bottom drill pipe and double rope coring drill pipe alternately drilling are explored. (4) there are hard skid strata (hard granite formations) in the deep part of Ruichang Depression, so the drilling efficiency is low and the bit wear is serious. However, in the face of deep hard skid rock, the drilling efficiency can not be improved by simply increasing the drilling pressure and increasing the friction force, otherwise it is easy to occur various accidents (such as serious bit wear, drill pipe fracture and drill choking). If only the method of increasing the thickness of the working layer of the bit is considered, the effect is not obvious. (5) through the analysis of the factors affecting the drilling of the deep hard skid rock formation and the relationship between them, In this paper, a new type of bit design (including drilling pressure, bit diamond quality, matrix hardness, lip shape, diamond concentration and working layer thickness) is proposed and successfully implemented.
【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P634
，
本文编号：2389266
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