Abstract
Hydraulic hammers have been extensively applied to horizontal directional well drilling in hard rock formations. However, the service life of a hydraulic hammer is still unsatisfactory due to the heavy wear or abrasion of the horizontal anvil, which leads to the failure and the reduction of service life in directional well drilling. In order to improve the performance life of a hydraulic hammer, the new type of anvil with a horizontal oriented slider has been designed. The abrasion property of the horizontal oriented slider have been numerically simulated and analyzed by Finite Element Analysis. Simulation and experimental results have shown that the abrasion rate exponentially varies with the mass of the anvil and the friction coefficient of horizontal oriented slider, nevertheless the abrasion rate of horizontal anvil is almost logarithmically varies with moving velocity of oriented slider. The maximum abrasion rate of horizontal oriented sliders will exceed 4% while moving velocity of the horizontal anvil is larger than 3m/s. While the mass of the anvil is 100kg, the maximum abrasion rate of horizontal oriented slider is 7.5?. However, the maximum abrasion rate of a horizontal oriented slider will be up to 16.5% while the friction coefficient is more than 0.2.
Highlights
A s a percussive and rotary drilling tool, the hydraulic DTH hammer with a fluidic amplifier has been extensively applied to geological core drilling, hydrological well drilling, trenchless drilling, oil and gas well drilling [1, 2]. due to the high penetration rate, low occurrence of drilling accidents and excellent borehole quality in drilling, the hydraulic hammer with a fluidic amplifier has been regarded as the most efficient drilling tool in hard rock or complicated formations [3,4,5]
Unlike the conventional vertical hole drilling with hydraulic hammers, horizontal directional well drilling demands the anvil horizontally impact the drill bit while the hydraulic DTH hammer is in operation, which aggravates the abrasion of hydraulic hammer and leads to the reduction of service life of hydraulic DTH hammers
The related experiments are conducted in order to improve the service life of hydraulic DTH hammers while in horizontal directional well drilling
Summary
A s a percussive and rotary drilling tool, the hydraulic DTH hammer with a fluidic amplifier has been extensively applied to geological core drilling, hydrological well drilling, trenchless drilling, oil and gas well drilling [1, 2]. due to the high penetration rate, low occurrence of drilling accidents and excellent borehole quality in drilling, the hydraulic hammer with a fluidic amplifier has been regarded as the most efficient drilling tool in hard rock or complicated formations [3,4,5]. With the rapid development of drilling technology, the application of hydraulic hammers with a fluidic amplifier has been extended to horizontal directional well drilling in recent years, which contributes to the development of trenchless drilling technology of oil-gas pipeline construction in hard rock and complicated formations. In order to improve the penetration rate and drilling cost of hard rock formations, the hydraulic hammer has been initially proposed and designed in Former Soviet Union, and a proven efficiency of 40% has been achieved with new generation of hydraulic hammer. The new type of hydraulic DTH hammer with a horizontal oriented slider has been urgently designed and applied to horizontal directional well drilling in order to improve the service life of hydraulic DTH hammers. The abrasion property of horizontal oriented slider has numerically analyzed by Finite Element Analysis, which indicates the design and optimization of hydraulic hammers in horizontal directional well drilling
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