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Research on the Optimization of a Drilling Rock Breaking Method Based on Fuzzy Cluster Analysis
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作者 Kun Du Zhen Wei 《Fluid Dynamics & Materials Processing》 EI 2022年第3期751-760,共10页
Improving drilling efficiency is the best way to reduce drilling costs and the choice of the drilling mode is instrumental in doing so.At present,however,a standard approach for the optimization of these processes doe... Improving drilling efficiency is the best way to reduce drilling costs and the choice of the drilling mode is instrumental in doing so.At present,however,a standard approach for the optimization of these processes does not exists yet.Through a comparative statistical analysis of the rock-breaking mechanisms and the characteristics of different drilling methods,this research proposes a set of cues to achieve this objective.Available statistical data are classified by means of a fuzzy cluster analysis according to the anti-drilling characteristic parameters of formation.The results show that different drilling methods rely on their own rock breaking mechanisms and have distinct characteristics.The rotary table drilling method is the most commonly used drilling mode,however,it displays some limitations with regard to deep wells,ultra-deep wells and difficult formations.The combined drilling method has the advantages of both the rotary table drilling and the down-hole power drilling modes.Polycrystalline diamond compact(PDC)drill bits can lead to good results for medium hardness and weakly abrasive formations.Underbalanced drilling for formations with high hardness and strong abrasiveness displays some limitations. 展开更多
关键词 drilling methods anti-drilling characteristic fussy clustering optimization method
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Research on Stress and Strength of High Strength Reinforced Concrete Drilling Shaft Lining in Thick Top Soils 被引量:11
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作者 YAO Zhi-shu CHANG Hua RONG Chuan-xin 《Journal of China University of Mining and Technology》 EI 2007年第3期432-435,共4页
High strength reinforced concrete drilling shaft linings have been adopted to solve the difficult problem of supporting coal drilling shafts penetrating through thick top soils. Through model experiments the stress an... High strength reinforced concrete drilling shaft linings have been adopted to solve the difficult problem of supporting coal drilling shafts penetrating through thick top soils. Through model experiments the stress and strength of such shaft linings are studied. The test results indicate that the load beating capacity of the shaft lining is very high and that the main factors affecting the load bearing capacity are the concrete strength, the ratio of lining thickness to inner radius and the reinforcement ratio. Based on the limit equilibrium conditions and the strength theory of concrete under multi-axial compressive stressed state, a formula for calculating the load-beating capacity of a high strength reinforced concrete shaft lining was obtained. Because the concrete in a shaft lining is in a multi-axial compressive stress state the compressive strength increases to a great extent compared to uni-axial loading. Based on experiment a formula for the gain factor in compressive strength was obtained: it can be used in the structural design of the shaft lining. These results have provided a basis for sound engineering practice when designing this kind of shaft lining structure. 展开更多
关键词 shaft sinking by drilling method shaft lining highstrength concrete STRENGTH designing method
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Double-face intelligent hole position planning method for precision blasting in roadways using a computer-controlled drill jumbo
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作者 Haojun Wu Min Gong +2 位作者 Renshu Yang Xiaodong Wu Xiangyu Liu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第6期1025-1037,共13页
To solve the uneven burden of same-type holes reducing the blasting efficiency due to the limitation of drilling equipment,we need a double-face program-controlled planning method for hole position parameters used on ... To solve the uneven burden of same-type holes reducing the blasting efficiency due to the limitation of drilling equipment,we need a double-face program-controlled planning method for hole position parameters used on a computer-controlled drilling jumbo.The cross-section splits into even and uneven areas.It also considers the uneven burden at the hole’s entrance and bottom.In the uneven area,various qualifying factors are made to optimize the hole spacing and maximize the burden uniformity,combined with the features of the area edges and gridbased segmentation methods.The hole position coordinates and angles in the even area are derived using recursion and iteration algorithms.As a case,this method presents all holes in a 4.8 m wide and 3.6 m high cross-section.Compared with the design produced by the drawing method,our planning in the uneven area improved the standard deviation of the hole burden by 40%.The improved hole layout facilitates the evolution of precise,efficient,and intelligent blasting in underground mines. 展开更多
关键词 drill and blast method green mine blast design drilling jumbo BURDEN
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THREE-DIMENSIONAL NONLINEAR ANALYSIS OF DRILL STRING STRUCTURE IN ANNUI US
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作者 刘延强 吕英民 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1994年第3期275-290,共16页
Three-dimensional nonlinear analysis of drill string structure in annulus of curvedwellbore is done by using the theory of finite element and Newton-Raphson method.According to the characteristics of its deformation,... Three-dimensional nonlinear analysis of drill string structure in annulus of curvedwellbore is done by using the theory of finite element and Newton-Raphson method.According to the characteristics of its deformation,a method of the description andcomputation of taking different forms of elements for different parameters is advanced.The penalty function method is applied for finding the unknown boundary .the nonlinear effects of curvature of wellbore on the side forces on bit ae shown by thecomputation. 展开更多
关键词 Newton-Raphson method. penalty function method. nonlineareffect. drill string
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HYDRODYNAMIC ANALYSIS OF SUCK-IN PULSED JET IN WELL DRILLING 被引量:16
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作者 WANG Rui-he DU Yu-kun NI Hong-jian MA Lin 《Journal of Hydrodynamics》 SCIE EI CSCD 2011年第1期34-41,共8页
The development of new drilling methods is important for the exploration and production of oil fields.The pulsed jet is a drilling technology of high potentiality.This article proposes a new concept of suck-in pulsed ... The development of new drilling methods is important for the exploration and production of oil fields.The pulsed jet is a drilling technology of high potentiality.This article proposes a new concept of suck-in pulsed jet with self-excited oscillation,by which a full use of the hydraulic power can be made in the annular space.A hydrodynamic analysis of suck-in pulsed jet with self-excited oscillation is carried out by numerical simulations and rock-breaking experiments.It is shown that with the jet,a negative pressure zone will be formed in the oscillation cavity to ensure automatic sucking of enough annular fluids and the formation of an efficient pulsed jet.The rock-breaking and pressure testing results have verified the reliability of the numerical simulation.The research provides a basis for the development of the pulsed jet drilling technology. 展开更多
关键词 drilling methods numerical simulation pulsed jet rock-breaking suck-in
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CFD-DEM simulation of the hole cleaning process in a deviated well drilling: The effects of particle shape 被引量:10
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作者 Siamak Akhshik Mehdi Behzad Majid Rajabi 《Particuology》 SCIE EI CAS CSCD 2016年第2期72-82,共11页
We investigate the effect of particle shape on the transportation mechanism in well-drilling using a three-dimensional model that couples computational fluid dynamics (CFD) with the discrete element method (DEM). ... We investigate the effect of particle shape on the transportation mechanism in well-drilling using a three-dimensional model that couples computational fluid dynamics (CFD) with the discrete element method (DEM). This numerical method allows us to incorporate the fluid-particle interactions (drag force, contact force, Saffman lift force, Magnus lift force, buoyancy force) using momentum exchange and the non-Newtonian behavior of the fluid. The interactions of particle-particle, particle-wall, and particle-drill pipe are taken into account with the Hertz-Mindlin model. We compare the transport of spheres with non-spherical particles (non-smooth sphere, disc, and cubic) constructed via the multi- sphere method for a range of fluid inlet velocities and drill pipe inclination angles. The simulations are carried out for laboratory-scale drilling configurations. Our results demonstrate good agreement with published experimental data. We evaluate the fluid-particle flow patterns, the particle velocities, and the particle concentration profiles. The results reveal that particle sphericity plays a major role in the fluid-solid interaction. The traditional assumption of an ideal spherical particle may cause inaccurate results. 展开更多
关键词 CFD-DEM method Deviated well drilling Particles transport Two-way coupling scheme Particle-fluid Interaction
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RECENT PROGRESS IN RESIDUAL STRESS MEASUREMENT TECHNIQUES 被引量:14
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作者 Xianfu Huang Zhanwei Liu Huimin Xie 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2013年第6期570-583,共14页
Residual stress measurement is of critical significance to in-service security and the reliability of engineering components, and has been an active area of scientific interest. This paper offers a review o[ several p... Residual stress measurement is of critical significance to in-service security and the reliability of engineering components, and has been an active area of scientific interest. This paper offers a review o[ several prominent mechanical release methods for residual stress measurement and recent developments, focusing on the hole-drilling method combined with advanced optical sensing. Some promising trends for mechanical release methods are also analyzed. 展开更多
关键词 residual stress mechanical release method hole drilling moiré interferometry holography ESPI digital image correlation
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