Self-powered photodetectors have the advantages of high sensitivity, sustainability, and small size become a research hotspot in advanced optoelectronic systems. However, low output photocurrent density seriously hinders practical application ferroelectric self-powered photodetectors. Herein, high-efficiency photoelectric detection performance Bi1-xHoxFeO3 photodetector is realized by doping Ho. The responsivity (R) detectivity (D*) can reach 0.0159 A/W 1.94 × 1011 Jones under monochromatic...

Mitigating greenhouse gas emissions from hydrocarbon wells is an industrywide challenge, with microstructural variations in the cement sheaths lining recognized as key factors forming leakage pathways. To better understand and corresponding mechanisms, downscaled samples simulating rock–cement–casing casing–cement–casing were prepared then scanned using nano-computed tomography at resolutions of 11.93 μm 6.80 μm, respectively. Both radial axial porosity regions interest quantified analyzed....

Summary Integrity of the cement/casing interface is an essential element establishing effective barrier system in cased and cemented wellbores. Failure to establish maintain can result negative environmental economic impacts, such as leakage formation fluids into environment or loss production costly remediation. The main focus this paper defined characterization microstructure, which critical for better understanding requirements zonal isolation long-term integrity wellbore sections active...

The anomalous photovoltaic (APV) effect is promising for high-performance ferroelectric materials and devices in photoelectric applications. However, it a challenge how to tune the APV by utilizing characteristic structure of ferroelectrics. Here, domain engineering strategy proposed enhance lead-free 0.88(Na0.5Bi0.5TiO3)-0.12(Ba1–1.5xSmxTiO3) (NBT-BST) ceramics. By tuning size based on Sm3+ doping, maximum open-circuit voltage (VOC) 18.1 V obtained when content 0.75%, which much larger than...

Air DTH (Down-The-Hole) hammer percussion drilling (vibration drilling) has proven to be a highly efficient geothermal technique, and fractures near the wellbore benefit energy development in many ways (such as hydraulic fracturing, perforation, etc.). However, no research been done on mechanism of fracture-increasing permeation-increasing granite pore walls by air drilling. This article: (1) using an test device, whole bit impact rock fragmentation was conducted atmospheric environment; (2)...

Summary Cement-rock interface is a major component of the wellbore barrier system. Leakage may result from poor bonding between cement and rock interface. In this paper we investigate possible factors that affect cement-rock bonding. More specifically, integrity was characterized using micro-computed tomography (CT) environmental scanning electron microscopy (ESEM). Hollow cylinder samples were prepared by (e.g., Banff dolostone, Pekisko limestone, Doig sandstone, Notikewin siltstone,...

Ultrahigh photodetection performance is achieved in hexagonal YbMnO 3 -based self-powered photodetectors by tuning their domain and polarity interface through the sintering temperature.

To realize real-time monitoring and short-term forecasting forewarning of coalmine ventilation systems (CVS), in this paper, we first established a joint surface underground CVS safety management system consisting main fan, safety-partition linked passageways, air-required locations. We then applied chaos theory to identify the air quantity gas concentration partition boundaries, adopted fixed data quantity, multi-step progressive, weighted first-order local-domain method setup prediction...

Summary Stress-induced fractures in wellbore cement can form high-risk pathways for methane or carbon dioxide leakage, yet little to no quantitative information on the impact of these has been reported. To investigate this, scanning electron microscopy (SEM) and microcomputed tomography (micro-CT) techniques were used quantify 2D 3D geometrical parameters mature thermal thixotropic samples that subjected pre- post-peak compressive stress. A novel simulation method was also proposed...

The construction of coal body microstructure is the foundation realizing organic combination micro seepage experiment and simulation.In light problem that traditional experimental methods cannot directly reveal microstructure, a three-dimensional (3D) digital model for based on non-contact computed tomography (CT) images was developed here.Firstly, high-precision micro-CT system µCT225KvFCB used to obtain two-dimensional (2D) CT core.Secondly, image pre-processing methodical approach...

Microchannels located at the cement–rock interface can form potential pathways for formation fluid leakage in oil and gas wells. The effects of geometric shape, quantity, inclination angle microchannels on flow through cemented rock samples were explored. Finite element 3D models established based modified micro-CT images obtained from physical samples. volume rate different sections was extracted after simulations. numerical results showed that with presence a single microchannel, total...

The large-scale storage and stable supply of oil products are essential for national energy security economic development. As the economy expands demands rise, centralized systems become increasingly vital ensuring efficiency reliability product distribution. However, large depots present substantial safety risks. In event fires, explosions, or other accidents, emergency response efforts face stringent challenges. To enhance capabilities transportation bases (OSTBs), this paper proposes an...

Abstract Stress-induced fractures in wellbore cement can form high-risk pathways for methane or carbon dioxide leakage yet little to no quantitative information on the impact of these has been reported. To investigate this, scanning electron microscopy (SEM) and micro computed tomography (micro-CT) techniques were utilized quantify 2D 3D geometrical parameters mature thermal thixotropic samples that subjected pre- post-peak compressive stress. A novel simulation method was also proposed...

The integrity of oil pipelines has received considerable attention. Pipeline leakage accidents cause environmental pollution and casualties. Analysis accident data in recent years shows that the harbor pipeline is prone to natural disasters such as typhoons. vulnerability analysis was conducted from three perspectives: typhoon grades, windward angles, operating conditions. analytic hierarchy used build evaluation index system. score can be calculated by semi-quantitative method. results show...