Hydraulic Hammer Drilling Technology: Developments and Capabilities

Melamed, Y.; Kiselev, Andrei; Gelfgat, Michael; Dreesen, D.S.; Blacic, J. D.

doi:10.1115/1.483154

Cited by 47 publications

(31 citation statements)

References 2 publications

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“…Development of fluidic hammers with great single-impact energy is the current prevailing trend [38,39]. It can be concluded from Equations (9) and (10), when the parameters of the fluidic hammer keep the same, the single-impact energy E is proportional to the square of u or Q s , and without regard to the interaction, smaller areas of A s and A p mean higher single-impact energy.…”

Section: Performance Analysis Related To the Flow Behaviormentioning

confidence: 98%

Performance Study of a Fluidic Hammer Controlled by an Output-Fed Bistable Fluidic Oscillator

Zhang

Peng

et al. 2016

Applied Sciences

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Using a no-moving-component output-fed bistable fluidic oscillator to control fluid flows into a parallel path has been recognized for a considerable time, but as yet it is not so widely adopted as its obvious benefits would deserve. This may be attributed to the encountered problems associated with its jet behavior, complicated by its loading characteristics. In order to investigate a typical case for the application of the output-fed fluidic oscillator, this paper elaborates on the computational fluid dynamics (CFD) simulation method for studying the performance of a fluidic hammer controlled by an output-fed bistable fluidic oscillator. Given that couple mechanism exists between the flow field in the fluidic oscillator and the impact body, dynamic mesh technique and a user-defined function written in C programming language were used to update the mesh in the simulations. In terms of the evaluation of performance, the focus is on the single-impact energy and output power of the fluidic hammer in this study, to investigate the effect of different parameters of the impact body on them. Experimental tests based on the noncontact measuring method were conducted to verify the simulation results, by which the accuracy and reliability of this CFD simulation method was proved.

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Section: Performance Analysis Related To the Flow Behaviormentioning

confidence: 98%

Performance Study of a Fluidic Hammer Controlled by an Output-Fed Bistable Fluidic Oscillator

Zhang

Peng

et al. 2016

Applied Sciences

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“…Static and lower WOB. For example, an ROP of 3.3 m h À1 was achieved with an 8 3/4 inch bit when the WOB was 4.5 ton, whereas in the rotary drilling mode 18.5 ton WOB was needed to achieve the same ROP (Melamed et al, 2000).…”

Section: Pros and Consmentioning

confidence: 99%

“…With the same rotation and weight on bit (WOB ), the percussion-rotary method is 7.3 times faster than the conventional rotary method in a medium-hard granite, whereas under the best operational conditions for both methods, the percussion-rotary technique has a 2.3 times advantage in ROP over the rotary approach (Melamed et al, 2000).…”

Section: Pros and Consmentioning

confidence: 99%

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Principles of Drilling and Excavation

Han

Dusseault

Detournay

et al. 2009

Drilling in Extreme Environments

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Predicting the performance of drills requires analytical capabilities that account for the tools characteristics, rock properties and behavior, the temperature, and other parameters. Also, it necessitates understanding the effect of the applied forces, details of the bit, and the interaction with the drilled rock. This chapter covers the principles of drilling and excavation, both analytically and experimentally, and the requirements for optimization of the drilling operation. Physical Properties of Rocks Terrestrial RocksThe vast array of terrestrial rocks can be simplified into a few basic types. One useful classification scheme is to group rocks via their mode of origin, specifically into igneous, sedimentary, and metamorphic rock types. Igneous rocks are those that solidified directly from a molten state, of which basalt is the prime example. Such rocks can be glassy if quickly cooled, or fully crystalline if allowed to cool slowly. Sedimentary rocks, in contrast, are composed of individual mineral or lithic fragments that have been transported and deposited in layers or strata. These strata have been compacted or re-cemented to form a rock-like mass. Finally, metamorphic rocks are igneous or sedimentary rocks that have altered during burial by heat and/or pressure. The original rock fabric, textures, and mineral assemblages are gradually replaced or overprinted as metamorphism progresses.Drilling in Extreme Environments. Edited by Yoseph Bar-Cohen and Kris Zacny Rock response to external loading depends not only on the level of applied loads, but also on rock properties. Based on their functionalities, there are three categories of rock properties often used in the analysis of rock behavior:. Elastic properties such as Youngs modulus, shear modulus, bulk modulus, Poissons ratio, bulk compressibility, and grain or matrix compressibility. They define rock elastic deformation. . Strength properties describing the loading limit a rock could afford and its plastic behavior. There are several strength variables, such as cohesive strength, tensile strength, compressive strength, and internal friction angle. . Transport properties, for example, rock porosity and permeability, describe the ability of fluid to pass through a rock.These properties are essential for any analytical or numerical effort to describe or predict rock mechanical behavior. The reliability of their values is at least as important as the prediction method itself, if not more so. Rock properties from these categories are not independent. Often, it is found that they are related to each other either directly or indirectly. For example, rocks with high strength are likely to have high modulus, low Poissons ratio, and low porosity. In this section, we will first describe each rock property and its connection with others; then, we will briefly discuss the two methods generally applied to determine its value. 2.2.

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“…Because of the impact loads at the bit inserts in percussion drilling are much higher than the load levels typically achieved in rotary drilling, and the total contact time of inserts with the rock is substantially less than during rotary drilling (Melaned et al, 2000), the DTH air hammer can provide high penetration rate and have been widely used in mining (Franca, 2011). In conventional DTH air hammer drilling methods, the compressed gas is pumped down into the drill pipe and out through the drill bit directly, then carrying drill cuttings into the annulus between drill pipe and borehole to return to the surface.…”

Section: Structure Design Of the Dth Air Hammermentioning

confidence: 99%

Detection Of Multilayer Cavities By Employing RC-DTH Air Hammer System And Cavity Auto Scanning Laser System

Luo

Peng

et al. 2015

Archives of Mining Sciences

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The subterrane an c avities are seriously thre atened to construction and mining safety, and it's important to obtain the exact localization and dimensions of subterranean cavities for the planning of geotechnical and mining activities. Geophysical in vestigation is an alternative method for cavity detection, but it usually failed for the uncertainly so lution of information and data obtained by Geophysical methods. Drilling is considered as the most accurate method for cavity detection. However, the conventional drilling methods can only be used for single cavity detection, and there is no effective solu tion for multilayer cavities detection have been reported. In this paper, a reverse circulation (RC) down-the-hole (DTH) air hammer system with a special structured drill bit is built and a cavity auto scanning laser system based on laser range finding technique was employed to confirm the localization and dimensions of the cavities. This RC-DTH air hammer system allows drilling through the upper cavities and putting the cavity auto scanning laser system into the cavity area through the central passage of the drill tools to protect the detection system from collapsing of borehole wall. The RC-DTH air hammer system was built, and field tests were conducted in Lanxian County Iron Ore District, which is located in Lv Liang city of Shan Xi province, the northwest of china. Field tests show that employing the RC-DTH air hammer system assisted by the cavity auto scanning laser system is an efficiency method to detect multilayer cavities.Keywords: multilayer cavities detection; RC-DTH air hammer; drill bit; cavity auto scanning laser system Podziemne wgłębienia i pustki stanowią poważne zagrożenie dla budowli oraz dla działalności górniczej; dlatego też podstawowym zagadnieniem jest ich dokładna lokalizacja i określenie wymiarów. Jest to niezbędne dla planowania prac geotechnicznych i wydobywczych. Badania geofizyczne są alternatywną metodą wykrywania podziemnych zagłębień, zazwyczaj jednak okazują się nieskuteczne ze względu na niepewność rozwiązań oraz danych uzyskiwanych za pomocą metod geofizycznych. Wykonanie odwiertu jest najdokładniejszą metodą wykrywania zagłębień i pustek, jednakże konwencjonalne metody prowadzenia wierceń pozwalają na wykrycie jednego tylko zagłębienia, nie ma też skutecznego rozwiązania kwestii istnienia zagłębień i pustek przechodzących przez liczne warstwy górotworu. W pracy omówiono zastosowanie układu młota pneumatycznego wgłębnego z odwrotnym obiegiem płuczki, wyposażonego w odpowiednie urządzenie wiertnicze, oraz układu skanera laserowego wykorzystującego technikę dalmierza do potwierdzania lokalizacji pustek i ich wymiarów. Prezentowany młot umożliwia dokonanie odwiertu w zagłębieniach i pustkach znajdujących się w warstwach wierzchnich, następnie w zagłębieniu tym umieszczane jest laserowe urządzenie skanujące powierzchnię komory wprowadzane poprzez główny kanał w urządzeniu wiertniczym, tak by zabezpieczyć skaner na wypadek osunięcia się ścian otworu. Układ składający się z młota ...

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Hydraulic Hammer Drilling Technology: Developments and Capabilities

Cited by 47 publications

References 2 publications

Performance Study of a Fluidic Hammer Controlled by an Output-Fed Bistable Fluidic Oscillator

Performance Study of a Fluidic Hammer Controlled by an Output-Fed Bistable Fluidic Oscillator

Principles of Drilling and Excavation

Detection Of Multilayer Cavities By Employing RC-DTH Air Hammer System And Cavity Auto Scanning Laser System

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