The Development of the Microwave Assisted Rock Breaking Device

2014 ◽  
Vol 900 ◽  
pp. 627-630 ◽  
Author(s):  
Guang Tong Feng ◽  
Zong Gang Wang ◽  
Zhen Wei
Keyword(s):  
Service Life ◽  
Hot Spot ◽  
Near Field ◽  
Rock Breaking ◽  
Field Energy ◽  
Drill Bit ◽  
Microwave Generator ◽  
Impact Wear ◽  
Microwave Assisted ◽  
Wear And Tear

Microwave crag broken is a thermal assisted rock breaking method which could melt rocks. Microwave assisted rock breaking method will not bring new impact, wear and tear, instead, the microwave pretreatment on the rock reduces the difficulty of breaking rock and prolongs the service life of the drill bit. This microwave generator accumulates the microwave near the hot spot to soften and melt the rock through generating and transmitting the microwave. And we had experimented with the microwave generator to penetrate the wood, and weaken the strength of the rock. And the experiment proved the scheme of the microwave assisted rock breaking through microwave near field energy and the thermal runaway effect is feasible.

Theoretical Analysis and Simulation of Microwave Drill for Rock

2014 ◽  
Vol 962-965 ◽  
pp. 886-889
Author(s):  
Zong Gang Wang ◽  
Zhen Wei
Keyword(s):  
Theoretical Analysis ◽  
Electric Field Intensity ◽  
Near Field ◽  
Rock Breaking ◽  
Thermal Runaway ◽  
Field Energy ◽  
Microwave Generator ◽  
Analysis Model ◽  
Microwave Assisted ◽  
System Equations

The paper analyzed the process of the microwave drill for rock, and established the theoretical analysis model and the system equations. And through the numerical simulation, the electric field intensity and the temperature of the top of the microwave generator increased with the increase of the depth that the conductor was inserted, and the thermal runaway effect was strengthened. So the microwave assisted rock breaking scheme with microwave near field energy and thermal runaway effect is feasible.

Study on Composite Design Suitable for High Hardness and Strong Abrasive Formation

2021 ◽  
Vol 8 ◽  
pp. 41-49
Author(s):  
Dongdong Song ◽  
Yingxin Yang ◽  
Haitao Ren
Keyword(s):  
Service Life ◽  
Stress Field ◽  
Impact Load ◽  
Polycrystalline Diamond ◽  
High Hardness ◽  
Rock Breaking ◽  
Drilling Process ◽  
Wear And Tear ◽  
Thermal Wear ◽  
Polycrystalline Diamond Compact

PDC (Polycrystalline Diamond Compact bit) composite is the most important cutting element of petroleum bit, which performance directly affects the service effect and service life of the bit. During the drilling process, the cutter will produce a large amount of friction heat when cutting the rock, resulting in a sharp increase in the internal temperature of the cutter. When the temperature reaches a certain value, thermal wear and tear are very easy to occur, which will not only cause diamond delamination but also reduce the wear resistance of the cutter. Under the action of impact load, impact failure is more likely to occur, which greatly reduces the service life of the cutter and the rock-breaking efficiency of the drill bit. Therefore, this paper studies the composite interface suitable for high-temperature drilling through the changes of cutting tooth temperature field and stress field with different interface shapes, which shows that the non-planar interface is more suitable for improving the cutting tooth life of composite under the action of comprehensive stress field.

Microwave PDC Drill Bit

2013 ◽  
Vol 774-776 ◽  
pp. 1414-1417
Author(s):  
Zong Gang Wang ◽  
Zhen Wei ◽  
Lai Ju Han
Keyword(s):  
Mechanical Energy ◽  
Rock Breaking ◽  
Drill Bit ◽  
Rotary Drilling ◽  
Pdc Bit ◽  
Wear And Tear ◽  
Drilling Cost ◽  
Combined Action ◽  
Drilling System ◽  
Microwave Heat

On the rotary drilling system, the technologies for fracturing and cutting hard rock are mainly mechanical rock breaking methods by use of improving bottomhole water horse power and bit energy, and the working life and rock breaking efficiency have much room for improvement. Microwave crag broken is a thermal assisted rock breaking method which could melt rocks. Microwave assisted rock breaking method will not bring new impact, wear and tear, instead, the microwave pretreatment on the rock reduces the difficulty of breaking rock and prolongs the service life of the drill bit. Under the combined action of microwave heat and mechanical energy of PDC bit, the rock breaking efficiency is improved greatly, and the drilling cost is reduced significantly.

scholarly journals Onset of the Mach Reflection of Zel’dovich–von Neumann–Döring Detonations

Entropy ◽  
2021 ◽  
Vol 23 (3) ◽  
pp. 314
Author(s):  
Tianyu Jing ◽  
Huilan Ren ◽  
Jian Li
Keyword(s):  
Hot Spot ◽  
Mach Reflection ◽  
Near Field ◽  
The Self ◽  
Small Scale ◽  
Mach Stem ◽  
Self Similarity ◽  
Von Neumann ◽  
Similarity Problem ◽  
Self Similar

The present study investigates the similarity problem associated with the onset of the Mach reflection of Zel’dovich–von Neumann–Döring (ZND) detonations in the near field. The results reveal that the self-similarity in the frozen-limit regime is strictly valid only within a small scale, i.e., of the order of the induction length. The Mach reflection becomes non-self-similar during the transition of the Mach stem from “frozen” to “reactive” by coupling with the reaction zone. The triple-point trajectory first rises from the self-similar result due to compressive waves generated by the “hot spot”, and then decays after establishment of the reactive Mach stem. It is also found, by removing the restriction, that the frozen limit can be extended to a much larger distance than expected. The obtained results elucidate the physical origin of the onset of Mach reflection with chemical reactions, which has previously been observed in both experiments and numerical simulations.

scholarly journals Near‐Field Energy Transfer between a Luminescent 2D Material and Color Centers in Diamond

2019 ◽  
Vol 3 (2) ◽  
pp. 1900088 ◽  
Author(s):  
Richard Nelz ◽  
Mariusz Radtke ◽  
Abdallah Slablab ◽  
Zai‐Quan Xu ◽  
Mehran Kianinia ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Near Field ◽  
Color Centers ◽  
Field Energy ◽  
2D Material

Visualizing near-field energy flow and radiation

2000 ◽  
Vol 42 (6) ◽  
pp. 46-54 ◽  
Author(s):  
E.K. Miller ◽  
F.J. Deadrick
Keyword(s):  
Energy Flow ◽  
Near Field ◽  
Field Energy

Kinematic and bottom-hole pattern analysis of a composite drill bit of cross-scraping

2016 ◽  
Vol 231 (17) ◽  
pp. 3104-3117 ◽  
Author(s):  
Yingxin Yang ◽  
Chunliang Zhang ◽  
Lian Chen ◽  
Yong Liu
Keyword(s):  
Polycrystalline Diamond ◽  
Rock Breaking ◽  
Speed Ratio ◽  
Drill Bit ◽  
The Novel ◽  
Analysis Model ◽  
Fracture Failure ◽  
Bottom Hole ◽  
Geometric Relationship ◽  
Polycrystalline Diamond Compact

For improving the drilling efficiency of polycrystalline diamond compact drill bit, a novel polycrystalline diamond compact drill bit is presented with a new rock-breaking method named as cross-scraping. In the novel polycrystalline diamond compact drill bit which is referred to as a composite drill bit, polycrystalline diamond compact cutters are mounted on rotary wheels as major cutting elements, and as a result, mesh-like scraping tracks are formed in the outer radial area of the bottom-hole. Rock-breaking method of the composite drill bit causes both shearing and fracture failure of the bottom-hole rock, which will greatly increase the rock-breaking efficiency and will prolong the bit service life. By analyzing the complex motion of cutters on the composite drill bit, velocity and acceleration models of the cutters, as well as wheel/bit speed ratio model of the bit are established in accordance with the geometric relationship between cutters and bit body in a compound coordinate system. In simulation examples, motion tracks, velocity and acceleration features of the cutter and especially the bottom-hole pattern are analyzed. Further, indoor experiments are conducted to test the mesh-like bottom-hole pattern and rock-breaking features, which have proved the accuracy of the analysis model of the composite drill bit.

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