Abstract In candidate formations for geological Carbon Capture and Storage (CCS), carbonate minerals (e.g., calcite) are ubiquitously presented. The dynamic process of chemically induced alteration on carbonate‐rich reservoirs due to the injection supercritical holds paramount importance achieving an economic injectivity structural integrity system. How rocks undergo deterioration particularly how microcracks develop in presence carbon dioxide remain largely unknown. Here we employ a...

Abstract Particle sorting is one of the most interesting phenomena observed in formation scree slopes. We present a study this phenomenon through physical model tests and numerical simulations at grain scale, with focus on link between degree particle attributes, as well underlying mechanisms. By characterizing graphic segregation index, we show that increases difference size shape component materials deposited mixture increases. propose two factors, relative factor ( SF r ) OR ), absolute...

Crowd force by the pushing or crushing of people has resulted in a number accidents recent decades. The aftermath investigations have shown that physical interaction highly competitive crowd could produce dangerous pressure up to 4500 N/m, which leads compressive asphyxia even death. In this paper, numerical model based on discrete element method (DEM) as referenced from granular flow was proposed evacuation process group people, movement follows Newton's second law and body deformation due...

A series of experiments were conducted to study the effect obstacle on evacuation efficiency mice under different competitive condition. Firstly, low The drove escape in two typical settings. Setting I is an area 1.5m wide and long II a laterally constrained area. For both conditions, tests with without impact evacuation. At setting I, average time 305s 298s respectively for non-obstacle condition II, 313s Under condition, presence has little Secondly, same high 334s 297s mean 328s reduces...

Crowd dynamic has attracted the interest of scientists as a number crowd incidents happened in last decades. A series mice evacuation experiments were conducted test container with size 1.5 m long and 0.3 wide. 2 cm-wide exit is placed at middle two side walls respectively, i.e., one on wall other 0.3m wall. The trained to pass through exit. Joss sticks used produce smoke concentration high enough drive escape under competition. process was video-recorded for further analysis. average time...

The control architectures of Chuan Suo (CS) deep submergence rescue vehicle are introduced. hardware and software also discussed. part adopts a distributed system composed surface underwater nodes. A computer is used as machine. Underwater equipment based on multi-board-embedded industrial with PC104 BUS, which contains IO, A/D, D/A, eight-channel serial, power boards. parts complete data transmission through optical fibers. involves an IPC embedded Vxworks real-time operating system, upon...

Abstract Development of shale gas in Sichuan basin, China, is challenging as the target thinner than 10 m, burial depth deeper 3500 and structure stress systems are complex. To promote large-scale development dedicated geophysical techniques have been developed, a framework integrating geophysics, geology, engineering has formed. In integrated framework, geophysics works closely with geology from resource appraisal, well planning, to drilling fracturing horizontal wells. Application this...

This paper presents a design procedure for positioning tolerant air coil systems with maximum quality factor of the secondary coil. One objective transcutaneous energy transfer is robust power supply to implanted components. A varying coupling can significantly affect transferred power, which potentially leads requirement complex monitoring and control circuits. The proposed eliminates variation planar, rotationally symmetrical in lateral direction. achieved only by adjusting individual...

Microseismic monitoring (MSM) is one of the effective and real-time evaluation techniques for fracturing. The results from in-field MSM always provides valuable benefits that help us gain an insight into changes in reservoir status fracturing operation. Sichuan area has a complex structure characteristic many natural fractures are activated by fracturing.The paper describes different responses between shale tight sand, reveals its special fracture which probably method (Relative magnitude),...

Summary Frequently occurring casing deformation in horizontal wells has severely affected the efficient development of shale gas Sichuan Basin, China. To mitigate deformation, a good understanding mechanisms is necessary. In this work, seismic-based analysis on mechanism Luzhou block basin presented. Based seismic data, faults and fractures are interpreted, pore pressure in-situ stresses estimated, analyzed. The results show that 70% points located or with high stress difference (>15 MPa)....

In candidate formations for geological Carbon Capture and Storage (CCS), carbonate minerals (e.g., calcite) are ubiquitously presented. The dynamic process of chemically induced alteration on carbonate-rich reservoirs due to the injection supercritical CO2 holds paramount importance achieving an economic injectivity structural integrity system. How rocks undergo deterioration particularly how microcracks develop in presence carbon dioxide remain largely unknown. Here we employ a powerful...

ABSTRACT About a quarter century ago, Rodenberger carried out preliminary tests on novel chemical-propulsion gun for accelerating practical-sized projectile to muzzle velocities the order of several kilometers per second in cylindrical tube, within conventional peak-barrel-pressure constraints. The tube was continuously lined with thin film solid propellant that underwent very-high-burn-rate deflagration immediately after passage. generation combustion-product gases along maintain higher...

Summary Microseismic monitoring has become a tool of choice for the development and optimization oil gas production from unconventional reservoirs. In contrast to down-hole arrays, surface arrays provide greater coverage focal sphere are not restricted by difficulties in maintaining subsurface equipment. The ability determine an accurate velocity model monitored area directly affects accuracy microseismic event locations. However, it is difficult calibrate with instruments. this paper, we...

Summary With the continuous development of seismic exploration technology, quality evaluation acquired data is particularly important. It an important basis for evaluating data, formulating processing workflow and parameter selection, means analyzing whether meet needs. Based on improvement raw method, this paper proposes a method based wavelet consistency. This uses correlation principle to extract zero phase wavelet. through extraction common shot gather or receiver time first zero-cross...

Exit is the bottleneck of an evacuation from a room and flow rate through exit believed to be depended on its width. A series experiments were conducted in bi-dimensional container where mice driven pass two kinds identical width, i.e., conventional hopper-shape exit. The efficiency exits was experimentally compared by using under competition. results showed that reduces escape time 25% with Further study presence column front exits. increases 22.5%. On contrary, placement 48%. could greatly...

Summary The study of Pre-Sinian basement faults is great significance for oil and gas exploration in Sichuan basin because not only control the deep to ultra-deep palaeo structural evolution, tectonic features, distribution sedimentary facies, but also are main factors deveopment middle-deep Permian volcanic rocks reservoirs favorable facies. However, strata Basin experienced complex movement evolution. Due limitation many such as less contrasts rock physical properties, seismic wave fields,...