液动射流冲击器射流元件深井失效研究及对策

Invalidation Research and Countermeasure on efflux Element in Hyro-efflux Hammer in Deep Well

液动射流冲击器在深井模拟实验室进行了试验,其结果显示出了良好的应用前景,其可行性在实际应用中得到验证。但出现了一些问题。通过对不同液动射流冲击器射流元件在增加泵量的情况下进行实验,发现射流元件内部出现了水射流近似反射及脉冲现象;活塞及孔底岩石对元件的间接冲击会导致合金与射流元件胎体脱落;循环介质中的磨料粒子(来自硬岩、钻头),对元件进行切割;元件工作室内存在气穴现象,气泡的溃灭对元件造成损坏。为了防止射流元件失效,可采取加大喷嘴宽度、改变劈形、净化泥浆、加大冲锤质量及活塞行程、加缓冲器等措施。

the hydro - efflux hammer has been tested in analog deep well.Its results show it has good application potency ahd its feasibility is verified in practical application. At the same time, some problems appear too. Efflux elements in the different hydro - efflux hammer were use to go on experiment by adding pump discharge,and similar water jet reflection and impulse in efflux element were found when pump discharge was large.Indirect collision of piston on element and hard rock from bore bottom on element separated alloy from matrix of the efflux element. Abrasive particle in the circulation medium from hard rock and drill bit cut the element.There existed cavitation in work room of the element ,and the crumble and fall of air bubble broke the efflux element. In order to prevent from invalidation ofefflux element, some measures such as increasing nozzle width, changing split shape, purifying mud, enlarging hammer weight and piston stroke, adding buffer and so on are taken.