Extracting mud invasion information using borehole radar - A numerical study

In hydrocarbon drilling, mud filtrate penetrates permeable formations and alters the pore fluid characteristics in the immediate vicinity of the borehole. Typically, the prevailing in situ pore fluids are displaced by the invading mud filtrate, which leads to gradually changing distributions of the fluid and electrical properties....

GPR data imaging and interpretation-Introduction

Editorial

Deterioration of the piezoelectric properties of (Bi_0.5Na_0.5)TiO₃ when using Na₂CO₃ as a sintering aid: A crystallographic and microstructural study

In this work, we present the impact of using Na₂CO₃ as a sintering aid and grain growth agent on the crystal structure, microstructure, and piezoelectric properties of (Bi_0.5Na_0.5)TiO₃ ceramics. The addition of Na₂CO₃ leads to a substantial increase in the grain size...

Effect of single-side stroke limiter on cantilever-based piezoelectric energy harvesting from low frequency vibrations

Piezoelectric transducers which rely on oscillating cantilever-type beams to harvest mechanical energy locally available in environments have been of great interest as a substitute for batteries. Most of the research efforts focus mostly on designs which aim at resonance matching to achieve maximum energy output without taking the mechanical...

Estimating reservoir permeability with borehole radar

In oil drilling, mud filtrate penetrates into porous formations and alters the compositions and properties of the pore fluids. This disturbs the logging signals and brings errors to reservoir evaluation. Drilling and logging engineers therefore deem mud invasion as undesired and attempt to eliminate its adverse effects. However, the mud...

Borehole radar response of a mud-invaded oil-bearing layer

Associating Borehole Radar Imaging with Petrophysical Properties for a Mud-Contaminated Reservoir

In the phase of oil drilling, mud filtrate penetrates into porous formations and alters the pore fluid properties. This complicates well logging exploration, and inevitably gives rise to shift in reservoir estimation. Logging engineers deem mud invasion a harm and attempt to eliminate its impact on logging data exploration. However, from our...

Surface-doped graphitic carbon nitride catalyzed photooxidation of olefins and dienes: Chemical evidence for electron transfer and singlet oxygen mechanisms

A new photocatalytic reactivity of carbon-nanodot-doped graphitic carbon nitride (CD-C₃N₄) with alkenes and dienes, has been disclosed. We have shown that CD-C₃N₄ photosensitizes the oxidation of unsaturated substrates in a variety of solvents according to two competing mechanisms: the energy...

From Floor Plans to Condominium Rights Through an Augmented Reality Approach

The creation of a 3D cadaster faces a number of different challenges. Two of them are the collection of data on already existing 3D structures and the visualization for non-experts. The paper uses Augmented Reality (AR) technology for the visualization of models created from plans required in Austria to create condominiums. The advantages of...