Study on the Unplugging Technology Through Electric Explosion Controllable Shock Wave

2021 ◽  
Vol 143 (5) ◽  
Author(s):  
Jin Wang ◽  
Qilong Xue ◽  
Xiaoyou Du ◽  
Yanfeng Cao ◽  
Jifei Yu ◽  
...  
Keyword(s):  
Shock Wave ◽  
High Voltage Pulse ◽  
Practical Significance ◽  
Energy Conditions ◽  
Electric Explosion ◽  
Mechanism Analysis ◽  
Pressure Shock ◽  
The Core ◽  
Reservoir Conditions ◽  
Seepage Channel

Abstract For the increasing well plugging in oilfield development, a new unplugging technology is presented in this paper for the downhole plugging by using high voltage pulse wave. Based on the mechanism analysis, the circuit resistance model and the empirical calculation formula of the pressure shock wave are obtained, and the influence of the same current waveform on the pressure shock wave generated by the wire explosion is preliminarily studied in laboratory experiments under different energy conditions. A corresponding unplugging evaluation test device was designed to simulate the approximate downhole reservoir conditions in the places where the shock wave occurs to test the approximate downhole stress conditions of the core, and to test the permeability changes after different shock waves acted on the core. The results show that the peak value of the pressure shock wave is proportional to the effect of well unplugging, which verifies the feasibility of the unplugging and increasing permeability technology of the electric explosion-controlled shock wave. This technology can quickly dredge the oil seepage channel, increase well permeability, thus increasing the well productivity, which has a broad application prospect and important practical significance.

scholarly journals Equation of state studies at SILP by laser-driven shock waves

1996 ◽  
Vol 14 (2) ◽  
pp. 157-169 ◽  
Author(s):  
Yuan Gu ◽  
Sizu Fu ◽  
Jiang Wu ◽  
Songyu Yu ◽  
Yuanlong Ni ◽  
...  
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
Equation Of State ◽  
Shock Waves ◽  
Target Surface ◽  
Shock Adiabats ◽  
Pressure Shock ◽  
Aluminum Target ◽  
Laser Illumination ◽  
The Stability

The experimental progress of laser equation of state (EOS) studies at Shanghai Institute of Laser Plasma (SILP) is discussed in this paper. With a unique focal system, the uniformity of the laser illumination on the target surface is improved and a laser-driven shock wave with good spatial planarity is obtained. With an inclined aluminum target plane, the stability of shock waves are studied, and the corresponding thickness range of the target of laser-driven shock waves propagating steadily are given. The shock adiabats of Cu, Fe, SiO2 are experimentally measured. The pressure in the material is heightened remarkably with the flyer increasing pressure, and the effect of the increasing pressure is observed. Also, the high-pressure shock wave is produced and recorded in the experimentation of indirect laser-driven shock waves with the hohlraum target.

scholarly journals Shock Mechanism Analysis and Simulation of High-Power Hydraulic Shock Wave Simulator

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Xiaoqiu Xu ◽  
Han Tao ◽  
Junwei Han
Keyword(s):  
Shock Wave ◽  
High Power ◽  
Structure Optimization ◽  
Simulation Method ◽  
Mechanism Analysis ◽  
Hydraulic Shock ◽  
Characteristic Parameters ◽  
Software Simulation ◽  
Shock Mechanism ◽  
Shock Characteristic

The simulation of regular shock wave (e.g., half-sine) can be achieved by the traditional rubber shock simulator, but the practical high-power shock wave characterized by steep prepeak and gentle postpeak is hard to be realized by the same. To tackle this disadvantage, a novel high-power hydraulic shock wave simulator based on the live firing muzzle shock principle was proposed in the current work. The influence of the typical shock characteristic parameters on the shock force wave was investigated via both theoretical deduction and software simulation. According to the obtained data compared with the results, in fact, it can be concluded that the developed hydraulic shock wave simulator can be applied to simulate the real condition of the shocking system. Further, the similarity evaluation of shock wave simulation was achieved based on the curvature distance, and the results stated that the simulation method was reasonable and the structural optimization based on software simulation is also beneficial to the increase of efficiency. Finally, the combination of theoretical analysis and simulation for the development of artillery recoil tester is a comprehensive approach in the design and structure optimization of the recoil system.

Increasing the force with which a shock wave discharged from the channel acts on an obstacle by way of converting a normal pressure shock to a system of oblique shocks

2004 ◽  
Vol 42 (6) ◽  
pp. 911-918 ◽  
Author(s):  
T. V. Bazhenova ◽  
V. V. Golub ◽  
A. L. Kotel?nikov ◽  
A. S. Chizhikov ◽  
M. V. Bragin ◽  
...  
Keyword(s):  
Shock Wave ◽  
Normal Pressure ◽  
Pressure Shock ◽  
Oblique Shocks

Injectivity and Propagation of Sulfonated Acrylamide-Based Copolymers in Low Permeability Carbonate Reservoir Cores in Harsh Salinity and Temperature Conditions : Challenges and Learnings from a Middle East Onshore Case Study

2021 ◽  
Author(s):  
Nicolas Gaillard ◽  
Matthieu Olivaud ◽  
Alain Zaitoun ◽  
Mahmoud Ould-Metidji ◽  
Guillaume Dupuis ◽  
...  
Keyword(s):  
Middle East ◽  
Polymer Solutions ◽  
Carbonate Reservoir ◽  
Core Material ◽  
Low Permeability ◽  
The Core ◽  
Reservoir Conditions ◽  
Carbonate Cores ◽  
The Impact ◽  
Mobility Reduction

Abstract Polymer flooding is one of the most mature EOR technology applied successfully in a broad range of reservoir conditions. The last developments made in polymer chemistries allowed pushing the boundaries of applicability towards higher temperature and salinity carbonate reservoirs. Specifically designed sulfonated acrylamide-based copolymers (SPAM) have been proven to be stable for more than one year at 120°C and are the best candidates to comply with Middle East carbonate reservoir conditions. Numerous studies have shown good injectivity and propagation properties of SPAM in carbonate cores with permeabilities ranging from 70 to 150 mD in presence of oil. This study aims at providing new insights on the propagation of SPAM in carbonate reservoir cores having permeabilities ranging between 10 and 40 mD. Polymer screening was performed in the conditions of ADNOC onshore carbonate reservoir using a 260 g/L TDS synthetic formation brine together with oil and core material from the reservoir. All the experiments were performed at residual oil saturation (Sor). The experimental approach aimed at reproducing the transport of the polymer entering the reservoir from the sand face up to a certain depth. Three reservoir coreflood experiments were performed in series at increasing temperatures and decreasing rates to mimic the progression of the polymer in the reservoir with a radial velocity profile. A polymer solution at 2000 ppm was injected in the first core at 100 mL/h and 40°C. Effluents were collected and injected in the second core at 20 mL/h and 70°C. Effluents were collected again and injected in the third core at 4 mL/h and 120°C. A further innovative approach using reservoir minicores (6 mm length disks) was also implemented to screen the impact of different parameters such as Sor, molecular weight and prefiltration step on the injectivity of the polymer solutions. According to minicores data, shearing of the polymer should help to ensure good propagation and avoid pressure build-up at the core inlet. This result was confirmed through an injection in a larger core at Sor and at 120°C. When comparing the injection of sheared and unsheared polymer at the same concentration, core inlet impairment was suppressed with the sheared polymer and the same range of mobility reduction (Rm) was achieved in the internal section of the core although viscosity was lower for the sheared polymer. Such result indicates that shearing is an efficient way to improve injectivity while maximizing the mobility reduction by suppressing the loss of product by filtration/retention at the core inlet. This paper gives new insights concerning SPAM rheology in low permeability carbonate cores. Additionally, it provides an innovative and easier approach for screening polymer solutions to anticipate their propagation in more advanced coreflooding experiments.

Mechanism analysis of magnetohydrodynamic shock control in hypersonic flow

2021 ◽  
pp. 095441002110425
Author(s):  
Shichao Luo ◽  
Jun Liu ◽  
Hao Jiang ◽  
Junyuan Wang
Keyword(s):  
Magnetic Field ◽  
Shock Wave ◽  
Lorentz Force ◽  
Applied Magnetic Field ◽  
Oblique Shock ◽  
Mechanism Analysis ◽  
Dipole Magnet ◽  
Counter Flow ◽  
Shock Control ◽  
Magnetohydrodynamic Shock

The effects of external magnetic fields on the shock-wave configuration at hypersonic plasma flow field are investigated in this paper. A series of numerical simulations over various geometry configurations, namely, a blunt body and a fixed-geometry inlet forebody, have been conducted by varying the applied magnetic field under different freestream conditions. Results show that magnetohydrodynamic shock control capabilities under three types of magnetic field are ranked from weak to strong as dipole magnet, solenoid magnet, and uniform magnet field. Under the same applied magnetic field, it is easier to deflect the shock at a relatively high altitude condition, compared with the low altitude case. The bow shock standoff distance is dependent on the distribution of counter-flow Lorentz force right after shock in the stagnation region. For the oblique shock control, the function of two components of Lorentz force is different that the counter-flow one decelerates the flow and increases the shock-wave angle, while the normal one squeezes the oblique shock and deflects the streamlines.

scholarly journals CO2-brine injectivity tests in high co2 content carbonate field, sarawak basin, offshore east Malaysia

2019 ◽  
Vol 89 ◽  
pp. 04005 ◽  
Author(s):  
A Giwelli ◽  
MZ Kashim ◽  
MB Clennell ◽  
L Esteban ◽  
R Noble ◽  
...  
Keyword(s):  
Packed Column ◽  
Core Sample ◽  
Chemical Analyses ◽  
Core Flooding ◽  
Flow Rates ◽  
X Ray ◽  
The Core ◽  
Reservoir Conditions ◽  
Post Test ◽  
Porosity And Permeability

We conducted relatively long duration core-flooding tests on three representative core samples under reservoir conditions to quantify the potential impact of flow rates on fines production/permeability change. Supercritical CO2 was injected cyclically with incremental increases in flow rate (2─14 ml/min) with live brine until a total of 7 cycles were completed. To avoid unwanted fluid-rock reaction when live brine was injected into the sample, and to mimic the in-situ geochemical conditions of the reservoir, a packed column was installed on the inflow accumulator line to pre-equilibrate the fluid before entering the core sample. The change in the gas porosity and permeability of the tested plug samples due to different mechanisms (dissolution and/or precipitation) that may occur during scCO2/live brine injection was investigated. Nuclear magnetic resonance (NMR) T2 determination, X-ray CT scans and chemical analyses of the produced brine were also conducted. Results of pre- and post-test analyses (poroperm, NMR, X-ray CT) showed no clear evidence of formation damage even after long testing cycles and only minor or no dissolution (after large injected pore volumes (PVs) ~ 200). The critical flow rates (if there is one) were higher than the maximum rates applied. Chemical analyses of the core effluent showed that the rock samples for which a pre-column was installed do not experience carbonate dissolution.

scholarly journals Theoretical insights into expression of leadership competencies in the process of management

2017 ◽  
Vol 15 (1) ◽  
pp. 220-226 ◽  
Author(s):  
Regina Andriukaitienė ◽  
Valentyna Voronkova ◽  
Olga Kyvliuk ◽  
Marina Maksimenyuk ◽  
Aita Sakun
Keyword(s):  
Organizational Development ◽  
Scientific Literature ◽  
Leadership Competencies ◽  
Practical Significance ◽  
Literature Analysis ◽  
The Core ◽  
Career Opportunities ◽  
Analysis And Synthesis ◽  
Research Findings ◽  
Leadership Research

The relevance of the topic is defined through the idea that appropriate leadership competencies and their application in certain activities enabling the followers can ensure the prospects of organizational development and individual career opportunities. To review and summarize the aspects of research findings of leadership science in expression of competencies in managerial processes, highlighting the leadership competencies in the context of general competencies. Methods. In order to formulate analytical findings describing the concept of leadership, generalizing the stages of development of theories, expression of leadership competencies and impact, there were used the methods of scientific literature analysis and synthesis as well as simulation. Results. According to the scientists insights, the article deals with leadership concept analysis, leadership research overview according to development stages. Scientific novelty. The analyzed theme has a scientific novelty, because recently there has been more and more discussion about the importance of leadership, but it is important to analyze the core leadership competencies that would predetermine both the findings of decisions of organizations’ managerial processes and positive changes of individual career in the integration in the activities of organizations. Practical significance. The need in leadership competencies is related to the issues of good leadership in organizations. Aiming to implement ideas of modern leadership in organisations, the leader has to have certain characteristics of leadership expressions, such as ability to communicate effectively, respond to the needs of others, and influence the behavior of the followers directing them towards the achieving of the set goals and implementation of the leader’s vision.

Stimulation of angiogenesis using single-pulse low-pressure shock wave treatment

2018 ◽  
Vol 96 (11) ◽  
pp. 1177-1187 ◽  
Author(s):  
Susinder Sundaram ◽  
Karthi Sellamuthu ◽  
Krishnaveni Nagavelu ◽  
Harikumar R Suma ◽  
Arpan Das ◽  
...  
Keyword(s):  
Shock Wave ◽  
Single Pulse ◽  
Low Pressure ◽  
Pressure Shock ◽  
Wave Treatment ◽  
Shock Wave Treatment ◽  
Stimulation Of

scholarly journals A Research on Management Idea Innovation of Pale-Biotic Fossils in LiaoNing Province of China

2011 ◽  
Vol 2 (3) ◽  
pp. 75
Author(s):  
Han Gang ◽  
Deng Mingran ◽  
Han Lizhuo ◽  
Jin Wanfeng
Keyword(s):  
Environmental Factors ◽  
Legal System ◽  
Liaoning Province ◽  
Practical Significance ◽  
Developing Strategy ◽  
Focal Points ◽  
Actual Situation ◽  
The Core ◽  
New Ideas

This paper has studied external environmental factors to influence top strategy of Liaoning pale-biotic fossils and the mode to bring forth new ideas on the basis of the top strategy theory, and in combination with the actual situation, it has been advanced that the work to bring forth new ideas in the management of Liaoning pale-biotic fossils should take bringing forth new ideas in the sense of thought as the leading; new ideas in the environment of legal system as the guarantee; new ideas in the system and mechanism as the key; new ideas in the construction of ranks as the fundament; new ideas in the modes and ways as the focal points; new ideas in the mechanism of investment as the base; new ideas in the cultural atmosphere as the soul; new ideas in the developing strategy as the core. The model to bring forth new ideas in the top strategy of Liaoning pale-biotic fossils was constructed, the conclusion was drawn to create continued bringing forth new ideas in the top superiority, it is of practical significance for perfecting the plan, protection and management of Liaoning pale-biotic fossils.

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