Polyaniline (PANI) is extensively researched as a corrosion protection coating for mild steel (MS) against acidic and neutral media. Corrosion inhibition performance of PANI coating on MS depends on the electrolytic solution employed for polymerization. In this study, the electropolymerization of aniline onto MS using sodium potassium tartrate (Na-K tartrate) and benzoic acid in the alcohol-water (BAW)

Initial fracture morphology and variation of acid-rock reaction temperature caused by alternate stages were ignored in the traditional alternate multistage acid-fracturing experiments, so a new design method of experiment simulation was proposed with these considerations in this paper. Alternate multistage acid-fracturing experiments were carried out based on this new method through using self-generating

Utilization of the rotary–percussive drilling tools can help to reduce friction along the drill string and improve drilling performance in hard rock formations. However, intrinsic vibration and shock loads may severely damage the bottom hole assembly (BHA) and measurement while drilling (MWD). This paper investigates the dynamic response of fluidic hammer with hydraulic-damping-device, a rotary–percussive

The management of oil fields that present high gas content is challenging, mainly in cases where this represents a bottleneck for oil production due to gas platform constraints. One way to deal with this problem is with the use of ICVs (Interval Control Valves), which enables the production to be controlled by zones in the wells. In this work, we propose a methodology using reactive control rules for

Mechanical behavior of rocks would have substantial implications for different operations from fluid injection and hydraulic fracturing in hydrocarbon reservoirs to underground carbon dioxide storage in the crust of the earth. In all of these operations, restricting the undesired seismicity events and preserving the integrity of formations is a crucial subject that enforces engineers to evaluate the

In current chemical flooding technology, surfactant and polymer (SP) rather than alkali, surfactant and polymer (ASP) flooding is preferred, because the addition of alkali in ASP flooding has been linked to environmental problems. However, in the absence of added alkali, the interfacial performance of petroleum sulfonate (PS) in SP flooding is greatly impaired. Therefore, an important task in SP flooding

The overview and analysis of technical, regulatory and procedural, administrative and business aspects of current situation in the field of downhole sampling in the Russian Federation is presented. The author's viewpoint on the physical and chemical factors of the samples quality is presented, concept and development trends of systematic approach to quality control of downhole sampling are proposed

Physical processes of oil charging in tight sandstone were simulated and analyzed using oil displacement water in sandstone micro-visualization models. Microscope dynamic characterizations of oil charging were obtained, and factors controlling the oil charging process in tight sandstones were elucidated in combination with thin section analysis, scanning electron microscopy (SEM) and rate-controlled

Image wirelogs, both acoustic and resistivity, encapsulate information regarding the studied reservoir’s petrophysical properties that are used to pursue a meaningful characterization of it. More recently, some authors used those image logs to estimate porosity and permeability using a traditional image processing pipeline or using a deep learning perspective. Among others, those quantities might be

This paper analyzed the geochemical characteristics and the sources of natural gas in the western Qaidam Basin based on isotopes and gas composition. The natural gas in the western Qaidam Basin is mainly comprised of hydrocarbon gases, including sapropelic, humic and mixed gas. In the southwestern Qaidam Basin, the main gas is sapropel gas, with some mixed gas and a small amount of humic gas. In contrast

The complex propagation behaviours of hydraulic fracture (HF) at bedding planes (BPs) and the produced complicated fracture geometry are essential to enhance the production of shale gas reservoirs. To better understand the complex propagation behaviour of HF at BPs with different bond strengths, the propagation behaviour, including arrest, crossing, and deviation, was identified first from post-fracturing

This paper introduces an anomalous linear-flow behavior, which has been observed when analyzing pressure transient data from wells with partially-propped fractures. Unlocking underlying characteristics of partially-propped fractures using transient-pressure responses will enable analysts to better understand well performance. This study focuses on the anomalous behavior and provides a solution to the

The hydrocarbons contained in the shale pores are mainly free gas and adsorbed gas. Accurate evaluation of the reservoir free gas density/hydrogen index and adsorbed gas density/hydrogen index can reflect the reservoir properties and assist in parameter evaluation. We proposed a method for calculate free gas density/hydrogen index and adsorbed gas density/hydrogen index by measures, and choose the

The production of gas and oil from the unconventional tight and shale reservoirs is the outcome through a series of cooperative efforts of drilling, completion, and production operations. This study aims to optimize these operations to enhance the well productivity and oil recovery, and ultimately to reduce the development footprint on the level of individual wells. More specifically, a comprehensive

In this research, the effect of different clay minerals (bentonite, illite and kaolinite) on the combustion behavior and kinetics of crude oils from Kazan region (Russia) was studied using thermogravimetry (TGA) and differential scanning calorimeter (DSC). The ramped temperature experiments were performed at constant heating rates (10, 20 and 30 °C/min) under air atmosphere. In both TGA and DSC experiments

Liquid nitrogen (LN) fracturing is an efficient technology for the development of unconventional gas resources. Due to continuous injection of cryogenic LN, the reservoir temperature decreases and then cooled rock regions are gradually generated during fracturing process. To investigate the breakdown behaviours of sandstone induced by LN fracturing, laboratory simulation experiments were performed

Measurements of bubble size distributions are very important in flotation which is widely used in different chemical industries such as the recovery of valuable minerals, wastewater treatment, deinking of waste paper, and oil recovery from tar sands. Although numerous authors determined bubble size distributions (BSD-s) in gas–liquid systems, BSD-s have been rarely determined in gas–liquid–solid systems

A two-step approach is presented for anomaly detection and diagnosis in batch process systems. The approach was applied to a case study of a decontamination process in biopharmaceutical drug product manufacturing. Analysis of historical operation data from four consecutive years was combined with process knowledge to achieve a deeper understanding of process failures, their impacts, and precursors

A new method to regenerate high pressure CO2 absorbent is presented in this paper, where PTFE hollow fiber membrane contactor was used as a gas–liquid separator in pressure swing process. CO2 desorption happened in the membrane contactor at the same time. The two mass transfer mechanisms were analysed through calculation of viscous flux and mass transfer coefficients. Experimental results showed that

Conductive filler/polymer composite foams (CPC) with micro-/nano-scale bubbles have attracted much attention due to their various advantages. Understanding the evolution of electrical behavior in CPC foams is important for their functional application. There have been many experimental investigations of the electrical behavior of CPC foams, but how the electrical conductivity varies with bubble growth

Understanding the methane adsorption mechanism in shale, especially for shale with abundant microfossils, is significant for guiding the exploration and development of shale gas. In this study, two groups of organic-rich shale samples derived from the Wufeng-Lungmachi formations were selected for methane adsorption experiments: one core sample contains abundant radiolarian fossils, while the other

In this paper, we developed a novel electrochemiluminescence (ECL) sensing system based on polydopamine nanoparticles (PDA NPs) and MoS2 nanosheet aerogel. PDA NPs with phenylboronic acid (PBA) were synthesized as a novel kind of organic nano-luminophores. The PDA-PBA NPs had high ECL efficiency and regulable emitting wavelength (552 ~ 610 nm). MoS2 nanosheet aerogel played the important role in the

Nonthermal plasma flow tube reactors are industrially scalable systems for the production of nanocrystal (NC) based materials and coatings. One key advantage of nonthermal plasma synthesis is the ability to both synthesize NCs and deposit films in a single reactor, as at the reactor outlet, NCs can be inertially deposited onto a target substrate. The size and morphology of deposited particles can substantially

The construction of ionic conductive hydrogels with complex deformation tolerance and excellent fatigue resistance is highly demanded yet challenging. Herein, a semi-interpenetrating ionic conductive hydrogel (SICH) is fabricated by a hydrogel-network constrained polymerization of 1-butyl-3-vinylimidazole tetrafluoroborate and acrylic acid in polyethylene oxide aqueous solution. Ascribing to the formation

Quasi-2D halide perovskites have recently emerged as a promising family of semiconducting materials for light-emitting applications. However, these materials usually consist of mixed 2D-3D perovskite phases with uncontrolled distributions when processed into films. Such film structures can be detrimental to carrier transport and transfer, limiting the electroluminescent properties and light-emitting

In this study, graphite-like biochars were successively prepared by pyrolyzing modified newspaper and maize straw with ball-milling and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)- mediated oxidation at a pyrolysis temperature of 900 °C and their physico-chemical properties and adsorption performances towards imidacloprid (IMI) and sulfadiazine (SUL) in aqueous solution were all explored. The results