| Hydro-powered Efflux Compaction Instrument has presented a broad application prospect in drilling engineering, but we find that when we apply the Hydro-powered Efflux Compaction Instrument to petroleum drilling or drilling-in-depth, the longevity of the key part of the compaction instrument has been reduced from 100 hours to 10 hours or less, which results in the ratios' increment of changing the instruments, thus seriously increasing the cost of drilling, this problem has set a temporal limit of the Hydro-powered Efflux Compaction Instrument's application prospect.Causes making the fluidic element's longevity reduced are various, definitely they could be divided into the follows: 1. although researches on the fluidic element has been lasted for tens of years and its inner structure and shape have been timely upgraded, the details, of which the rock powders driven by the high-speed fluid scour the inner surface, have not been realized to be calculated by scientific mathematical modulation, and its friction mechanism still needs to be discussed to depth. 2. as to the situation of which the parts can be easily abrased by the fractured rock powders driven by high-speed mud fluid, we currently adopted the method of copper brazing carbide directly, which are mainly distributed on the nozzle, sidewall and pin point. But the real problem is that friction often occurs in the sharp corner and side wall of the ventilation and in those complex structural regions, carbide could hardly be brazed. Against the problem of shortening longevity of the fluidic element in complex fluid media environment, this paper analyses its friction mechanism upon the materials' properties of the fluidic element, and builds the mathematic module of the fluidic element scoured by the mud fluid from the macroscopic and microscopic view. Seperately, this paper also discusses the courses, results and influencing factors of scouring of the fluidic element materials. But it is still required to compute the practical courses and time of fluidic element's failure.This paper also tries to search a way to improve the inner surface's overall wear-resisting property of the fluidic element by replacing the brazing carbide or surface treat the region which requires a higher wear-resisting property where carbide could not brazed with ease. One target is to make the calculation of the fluidic element's inner surface friction reasonable, the other is to comprehensively improve the inner surface hardness, wear-resisting property, cavitation resistance and partly impaction resistance of the fluidic element.Against the complicated inner surface of the fluidic element as well as the basic data required, such as the surface hardness and wear-resisting property, from the economic and manufacturing view, this test mainly adopts the D-gun spraying method, Shenyang Metal Research Institute and immersion ion implantation method, Lanzhou Chemistry and Physics Research Institute. Both of them dominate comparatively honorable reputation in the specialization of surface engineering and technology in our country, so they are the ideal places to process the fluidic element.After processed by these two methods, we had a test of the conjunction between the layer and the basal body, surface hardness and wear-resisting property, and we also lead a comparison between the experimental results and the basal body materials regarding to the operating life, from which we can draw a conclusion of the surface engineering effects. Plasma surface treating makes the 35CrMo steel harder 4~5 times and abrasion ratios decrease to three forth. Disposed by the D-gun spraying, the inner surface hardness has been as hard as the YG carbide, and its wear-resisting property increases 3 times, furthermore, the conjunction strength between the layer and the basal body is high enough to 80Mpa. Comprehensively speaking, the hardness and wear-resisting property of the fluidic element have been upgraded after disposal.Finally, during the application of the fluidic element, the causes a...
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