scholarly journals DEVICE FOR CREATING SLOTS-VOLTAGE CONCENTRATORS IN THE BOUNDARY AREA OF WELLS IN FINE ROCKS

2021 ◽  
Vol 2 (3) ◽  
pp. 283-287
Author(s):  
Arkady V. Leont’ev ◽  
Ekaterina V. Rubtsova
Keyword(s):  
Hydraulic Fracturing ◽  
Distinctive Feature ◽  
Stress Concentrator ◽  
Rock Masses ◽  
Practical Application ◽  
Boundary Area ◽  
Hard Rocks ◽  
Diamond Drill ◽  
Drill Holes

It is shown that in order to expand the field of practical application of directional measuring hydraulic fracturing, it is necessary to create technical means that provide cutting of initiating slots on the walls of boreholes in rock masses of different strength. A new slotter design is proposed, the distinctive feature of which is using carbide cutters that are extended during cutting slots along the normal to the device axis. The device is brought into operation due to its normalized movement tagging the bottom. The slotter dimensions allow using it in diamond drill holes of 76 mm diameter. The device is designed to create stress concentrator slots in adjoining zones of boreholes in hard rocks with a coefficient of 5-8 according to M. M. Protodyakonov’s scale.

scholarly journals Physiological Response of Populus balsamifera and Salix eriocephala to Salinity and Hydraulic Fracturing Wastewater: Potential for Phytoremediation Applications

2020 ◽  
Vol 17 (20) ◽  
pp. 7641
Author(s):  
Michael A. Bilek ◽  
Raju Y. Soolanayakanahally ◽  
Robert D. Guy ◽  
Shawn D. Mansfield
Keyword(s):  
Hydraulic Fracturing ◽  
Physiological Response ◽  
Dry Weight ◽  
Populus Balsamifera ◽  
Practical Application ◽  
Polluted Soils ◽  
Native Canadian ◽  
Anthropogenic Soil ◽  
Root Tissues ◽  
Substantial Rise

Natural and anthropogenic soil degradation is resulting in a substantial rise in the extension of saline and industrially-polluted soils. Phytoremediation offers an environmentally and economically advantageous solution to soil contamination. Three growth trials were conducted to assess the stress tolerance of native Canadian genotypes of Populus balsamifera L., Salix eriocephala Michx., and one hybrid willow (S. discolor × S. dasyclados) to salinity and hydraulic fracturing (fracking) wastewater. Thirty-three genotypes were grown in NaCl or fracking wastewater solutions between 0 and 7 mS−1 over a period of 3–4 months. P. balsamifera was observed to be relatively salt-intolerant compared to S. eriocephala and hybrid willow, which is likely caused by an inability of P. balsamifera to restrict Na+ translocation. Photosynthesis and transpiration decreased with salinity treatments, and severe reductions occurred with exposure to fracking solutions. Raffinose and stachyose content was tripled in leaf and root tissues. In willows, Na+ was primarily confined to root tissues, Cl− accumulated up to 5% dry weight in leaves, and K+ was translocated from roots to leaves. Willow genotypes CAM-2 and STL-2 displayed the greatest maintenance of growth and resistance to necrotic symptoms in all trials, suggesting that these genotypes may be useful for practical application and further field study.

scholarly journals High thermal conductive copper/diamond composites: state of the art

2020 ◽  
Vol 56 (3) ◽  
pp. 2241-2274
Author(s):  
S. Q. Jia ◽  
F. Yang
Keyword(s):  
Thermal Conductivity ◽  
Electronic Devices ◽  
Thermal Conductance ◽  
High Thermal Conductivity ◽  
Power Electronic ◽  
Practical Application ◽  
Boundary Area ◽  
Interface Characteristics ◽  
Composite Interface ◽  
Interface Thermal Conductance

Abstract Copper/diamond composites have drawn lots of attention in the last few decades, due to its potential high thermal conductivity and promising applications in high-power electronic devices. However, the bottlenecks for their practical application are high manufacturing/machining cost and uncontrollable thermal performance affected by the interface characteristics, and the interface thermal conductance mechanisms are still unclear. In this paper, we reviewed the recent research works carried out on this topic, and this primarily includes (1) evaluating the commonly acknowledged principles for acquiring high thermal conductivity of copper/diamond composites that are produced by different processing methods; (2) addressing the factors that influence the thermal conductivity of copper/diamond composites; and (3) elaborating the interface thermal conductance problem to increase the understanding of thermal transferring mechanisms in the boundary area and provide necessary guidance for future designing the composite interface structure. The links between the composite’s interface thermal conductance and thermal conductivity, which are built quantitatively via the developed models, were also reviewed in the last part.

Use of the microscope to discover faults cut by diamond drill holes

1937 ◽  
Vol 32 (5) ◽  
pp. 570-578
Author(s):  
Edward Hollister Wisser
Keyword(s):  
Diamond Drill ◽  
Drill Holes

Numerical simulation of fracture characteristics of jointed rock masses under blasting load

2019 ◽  
Vol 36 (6) ◽  
pp. 1835-1851 ◽  
Author(s):  
Chao Liu ◽  
Mingyang Yang ◽  
Haoyu Han ◽  
Wenping Yue
Keyword(s):  
Jointed Rock ◽  
Rock Masses ◽  
The Finite Element Method ◽  
Practical Application ◽  
Fracture Characteristics ◽  
Content Type ◽  
Jointed Rock Masses ◽  
Calculation Results ◽  
Damage Theory ◽  
Blasting Load

Purpose To study fracture characteristics of jointed rock masses under blasting load, the RFPA2D analysis software for dynamic fracture of rocks based on the finite element method and statistical damage theory was used. Design/methodology/approach On this basis, this research simulated the fracture process of rock masses in blasting with different joint geometrical characteristics and mainly analysed the influences of distance from joints to blasting holes, the length of joints, the number of joints and joint angle on fracture of rock masses. Findings The calculation results show that with the constant increase of the distance from joints to blasting holes, the influences of joints on blasting effects of rock masses gradually reduced. Rock masses with long joints experienced more serious damages than those with short joints. Damages obviously increased with the changing from rock masses without joints to rock masses with joints, and when there were three joints, the further increase of the number of joints had unobvious changes on blasting effects of rock masses. Joints showed significant guidance effect on the propagation of cracks in blasting: promoting propagation of main vertical cracks deflecting to the ends of joints. Originality/value The research results are expected to provide some theoretical bases in practical application of engineering blasting.

Progress report on analyses of pyritic core from diamond drill holes under gossan at Wadi Wassat, Saudi Arabia

1967 ◽  
Author(s):  
William C. Overstreet ◽  
Louis Gonzales ◽  
C.E. Thompson ◽  
Mohammed A. Fourati ◽  
Ali Sharah ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Progress Report ◽  
Diamond Drill ◽  
Drill Holes
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