0998/002 02.2010 1,000. r e f e r e n c e. technical review . borehole drilling and rehabilitation under field conditions
ادامه مطلب
A drainage technique named "Full-hole deep screen mesh pipe" was introduced and tested to prevent the collapse of borehole and reduce the negative pressure loss. The result shows that after the borehole was drilled, the borehole wall was affected by the complex stress of the deep coal seam, the coal surrounding the borehole …
ادامه مطلب
Borehole drilling with other techniques are considered to yield more reliable samples but have the disadvantage of logging through drill stems and casing. Rotary Core Drilling Rotary core drilling employs a core barrel attached to the end of the drill stem.
ادامه مطلب
Drilling pressure relief principle. The radius of a single borehole pressure relief zone is mainly affected by vertical stress, lateral pressure coefficient, surrounding rock cohesion, internal ...
ادامه مطلب
Analysis of fluid sealing mechanics of borehole and its impact factors [J], Journal of China University of Mining and Technology: 1996 (1): 25 ~ 30 (in Chinese) [9] Baiquan Lin, Cheng Zhai, Zhiyong Hao, et.al. Research on sealing device, sealing technology and sealing materials of borehole for gas suction [R], Xuzhou: China …
ادامه مطلب
The article discusses feasibility of frozen wall construction supervision in salt rock mine shafts using seismology techniques. Shallow seismic survey locates wakened areas and intense water flows ...
ادامه مطلب
In the mining industry, the ability to charge and blast a production borehole is fundamental. However, if rock mass conditions are challenging, with cavities, fracture zones or even unstable boreholes, the charging crew may fail to insert the required amount of explosives, resulting in bad fragmentation and significant production disturbances in …
ادامه مطلب
With the demand for mineral resources surging, cost- and time-efficient measurement techniques are increasingly needed in mineral exploration. Their ability to detect multiple elements that are building blocks of minerals makes spectrometric borehole logging tools popular in mineral exploration and mining grade control.
ادامه مطلب
Aiming to the risk of coal and gas outburst mine during coal roadway excavation in Xuehu Coal Mine, a novel cross-borehole hydraulic caving technique is proposed to prevent coal and gas outburst, so as to …
ادامه مطلب
The main techniques involved in the construction of boreholes (ICRC 2010) are percussion, rotary, and sonic: ... In ore mining by borehole, a third step involves the lowering of the borehole mining tool into the drill well (Pivnyak et al. 2017). This method requires less capital outlay than many other mining methods and it makes it possible to ...
ادامه مطلب
Data mining of petrophysical and lithogeochemical borehole ... this interpretation is not unequivocally supported by the borehole data. In this study, data mining, namely the Self-Organizing Map analysis, of extensive ... but examples on the use of data mining techniques for the interpretation of seismic data in hard rock settings are still
ادامه مطلب
Well construction and drilling techniques are reviewed focusing on the appropriateness of different methods for various aquifer characterization scenarios. The …
ادامه مطلب
Unlock the depths with precision and expertise in borehole drilling. Explore its history, methods, and importance in resource extraction.
ادامه مطلب
Borehole destressing is one of the most widely used techniques for mitigating coal bursts. Understanding the working principle of destressing boreholes, exploring the main efficiency factors, and proposing a quantitative method for determining the drilling parameters for coal burst control are essential for maximizing coal burst control. This …
ادامه مطلب
Borehole stability technology includes chemical as well as mechanical methods to maintain a stable borehole, both during and after drilling. Drilling fluids range from water to oil to complex chemical systems with properties designed for specific site conditions to aid the drilling process.
ادامه مطلب
The traditional borehole-sealing techniques mainly consider the fracture characteristics of coal masses, mining-induced stress distribution and sealing material, few achievements determine the borehole-sealing length through the combined methods and take the fractures around the boreholes into consideration.
ادامه مطلب
RESEARCH ARTICLE Instability-negative pressure loss model of gas drainage borehole and prevention technique: A case study Qingjie Qi1,2☯, Xinlei Jia ID 1,2 ☯*, Xinhua Zhou3, Youxin Zhao1,2☯ 1 School of Safety Science and Engineering, Liaoning Technical University, Fuxin, Liaoning, China, 2 Key Laboratory of Mine Thermodynamic …
ادامه مطلب
Borehole seismic surveys can be carried out in several different ways. The Down-hole technique consists of measuring the arrival of seismic waves emitted from the surface in increments down the borehole. The Cross-hole technique uses a seismic source located in an adjacent borehole. The receiver in both cases is a tri-axial geophone.
ادامه مطلب
The aforementioned borehole-sealing techniques considerably improved the sealing effect; however, it is still necessary to explore economical and efficient borehole-sealing techniques because of various factors such as a complex sealing process and high cost of sealing materials.
ادامه مطلب
Based on the borehole breakout method, this paper proposes a method for measuring in-situ stress by using a borehole stereo-pair imaging technique. Fi…
ادامه مطلب
Fundamentals of the cross-borehole hydraulic slotting technique. In the cross-borehole hydraulic slotting method, a cross-borehole is drilled from a rock roadway to a coal roadway, which is prepared for digging, and high-pressure water is used to cut slots in the coal seam in the cross-borehole.
ادامه مطلب
Semantic Scholar extracted view of "Draft ISRM suggested method for in situ stress measurement using the compact conical-ended borehole overcoring (CCBO) technique" by K. Sugawara et al.
ادامه مطلب
Both well logging and borehole geophysics are assuming greater importance in mineral exploration and development as targets become deeper, as drilling costs increase, and …
ادامه مطلب
What are the different types of bore drilling techniques and how do they differ? Bore drilling is a crucial process in various industries, including construction, …
ادامه مطلب
To reach the underground water sources, drillers must go deep into the earth during the process of water bore drilling using specialized equipment and techniques.
ادامه مطلب
This project was undertaken to extend the vertical borehole mining concept to the new tool configurations needed to economically mine pitching coal seams. The objective was to determine the optimum borehole mining plan and system for mining coal seams less than 10 feet thick that pitch more than 25 degrees.
ادامه مطلب
Drilling boreholes for the exploration of groundwater incurs high cost with potential risk of failures. However, borehole drilling should only be done in regions with a high probability of faster and easier access to water-bearing strata, so that groundwater resources can be effectively managed. However, regional strati-graphic uncertainties …
ادامه مطلب
Semantic Scholar extracted view of "A proposed method for determining in-situ stress from borehole breakout based on borehole stereo-pair imaging technique" by Z. Han et al.
ادامه مطلب
Harare Boreholes Provides Efficient Borehole Drilling Services Throughout Zimbabwe At Affordable Borehole Drilling Prices in Harare and Zimbabwe. Menu Home; About Us; Water Survey; Borehole Drilling ... We provide a complete range of drilling and mining services and can support your project from its initial exploration phase through to full ...
ادامه مطلب
A classification of various stress measurement methods is put forward and comments made on their applicability to longwall mining stressfield situations. Test results using a borehole hydraulic cell are presented and discussed following a trial at a …
ادامه مطلب
Contribution of mine borehole data toward high-resolution stress mapping: An example from northern Bowen Basin, Australia ... Borehole imaging techniques based on microconductivity changes in the ...
ادامه مطلب
The specific conditions of mining with borehole's diameters, rough walls crossed by discontinuities, and production costs limitations restrict the design and cost …
ادامه مطلب
Nuclear logging includes all techniques that either detect the presence of unstable isotopes, or that create such isotopes in the vicinity of a borehole.
ادامه مطلب
Plotting 3D borehole data is actually quite easy and can be done with any programming language such as Python (using numpy and matplotlib), R, Octave, or Matlab. Following is a simple tutorial coded in Matlab for visualizing borehole data applied on a real mining dataset from a major copper deposit. The mining dataset comes in the following …
ادامه مطلب
The conical-ended borehole technique and hemispherical-ended borehole technique are proposed, for the accurate stress measurement within a rock mass. ... The longwall mining method is not suitable ...
ادامه مطلب