Analysis of drilling failure in soft and hard sandwiching of coal seam

被引:12
|
作者
Liu Chun [1 ]
Zhou Fubao [2 ]
Man Zhongyi [2 ]
Liu Yingke [2 ,3 ]
机构
[1] China Univ Min & Technol, IoT Percept Mine Res Ctr, Xuzhou 221116, Jiangsu, Peoples R China
[2] China Univ Min & Technol, Fac Safety Engn, Xuzhou 221116, Jiangsu, Peoples R China
[3] China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Xuzhou 221116, Jiangsu, Peoples R China
基金
国家杰出青年科学基金;
关键词
Polycrystalline diamond compacts; Wear; Friction; Thermal damage; Load; POLYCRYSTALLINE DIAMOND; TRIBOLOGICAL BEHAVIORS; RESIDUAL-STRESSES; WEAR BEHAVIORS; FRICTION; FILM;
D O I
10.1016/j.engfailanal.2015.10.022
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The severe abrasion of drill bits will be confronted during drilling in soft and hard sandwiching of coal seam. Not only does this failure result in the increasing consumption of bits, but also it delays the construction period, significantly extending the duration of the delay, even causing borehole instability, resulting in a catastrophic buried well accident. In order to reveal the failure causes, the authors of this paper researched the wear properties of the tooth of bit. As the thermal damage is one of the main threats to drilling failure in soft and hard sandwiching, thermal related effects on the wear performance of polycrystalline diamond compacts (PCD) were studied by an Amsler friction and wear testing machine. Meanwhile, silica sands were added to the interface of wear couples throw a funnel instrument to meet the demand that wear conditions correspond more closely to those in actual coal seam drilling. The friction coefficient and wear rates was measured. The X-ray diffraction analysis was used to investigate the chemical composition and crystal structure of the PCDs soaked at different temperatures. The morphologies of the surface of PCDs were examined by metalloscope and scanning electron microscopy. The results show that the wear rate and wear coefficient all rose with the increase of wear load. So the drilling load over proper operation limits especially when the equipment stuck happened is the primary threat to bit failure. On the other hand, the wear coefficient is not sensitive to the soaking temperature when it is under 700 degrees C. But it decreases obviously when the temperature was over 800 degrees C, which seems to be corresponding to the graphitization of diamond and the oxidation of Co. This phenomenon indicates that the high temperature over 700 degrees C is the main cause of the drilling failure. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:544 / 553
页数:10
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