钢体PDC钻头修复技术之研究

Research on Repair Technique of Steel Body PDC Bit

摘要:

介绍了一种钢体PDC钻头修复技术。首先对已使用过的钢体PDC钻头的可修复性进行确认，将符合修复条件的钻头进行预处理后，以8~10 ℃/min的速度对钻头体加热，加热到620 ℃左右时，焊接切削齿的焊料开始熔化，把符合条件的复合片切削齿取下，放入600 ℃的焊剂中保温待用，最后利用堆焊技术对钻头体进行修复。现场试验证明，修复后的钻头质量与新加工钻头质量无明显差别。以修复一只12 (1/4) in钢体PDC钻头为例，至少可节约成本4.14万元人民币，经济效益明显。

Abstract:

A kind of steal body PDC repair technique was introduced. At first, confirm if the steal body PDC bit which has been already used can be repaired. Then, after pretreated to the bit that qualified to repair, heating it at the speed of 8~10 ℃/min, while heating to about 620 ℃, the solder flux which welded the cutters begins to melt, then take down the PDC cuts, put them to 600 ℃ solder flux to keep warm for use. At last, utilize surface hard facing technique to repair the bit. The on-the-spot test proved that there is no obvious difference on the bit quality between the bits after repair and the new one. For example, repairing a piece of 12(1/4) in steel body bit can economize the cost at least 41400 Yuan RMB. Economic benefits are obvious.