我队所有的鑽孔都是75％的斜井,地层复杂,有的流砂礫石层深达140公尺,因此大部鑽孔都須下200公尺左右的井壁管。下部岩层坚硬,多为磁鐵石英岩、片麻岩。孔深都在300公尺左右:全部使用泥漿,这就出现以下几种情況。 1.井壁管及井管接手磨損严重:因斜井在鑽进中鑽桿只磨井管的下面。譬如某号孔下108公厘井管170公尺,有90％的被报廢,接手全部损耗。其他各井也同样平均报廢20至40％。 2.起管困难,佔用設备,影响进尺:接手因都被磨破,起拔时易从接乎处裂断,造成起拔困难。如 All the holes drilled in our team are 75% inclined shafts. The formation is complicated with some silt gravel layers up to 140 meters deep. Therefore, most of the boreholes have to have a shaft wall pipe about 200 meters long. The lower rock hard, mostly magnetic quartzite, gneiss. Hole depth is about 300 meters: all the use of mud, which appeared in the following situations. 1. Shaft pipe and well pipe to take over the serious wear and tear: Because inclined shaft in the drilling drill pipe only under the grind pipe. For example, a hole number of 108 cm under a hole 170 meters, 90% of the scrapped, take over all the losses. The other wells also have an average of 20 to 40% scrap. 2. Since the management difficulties, occupy the equipment, affecting the footage: take over because of being worn, easy to pull from the connection at the time of cracking, resulting in difficulties in pulling out. Such as