The BST oilfield in the northwestern Taklamakan Desert is a fractured carbonate reservoir, but issues of water breakthrough are becoming increasingly severe with development flooding. Unfortunately, high-temperature and high-salt conditions (130 °C, 71695 mg/L) pose challenges for plugging agents. In this study, effects 2-acrylamido-2-methylpropane sulfonic acid (AMPS) content on AM/AMPS copolymers gels were studied through viscosity measurements, nuclear magnetic resonance (NMR),...

Abstract To further improve the ablation and thermal properties of silicon rubber composite materials, 3, 13‐divinyloctaphenyl double‐decker polyhedral oligomeric silsesquioxane (DV‐DDSQ) modified additional vinyl‐terminated polydimethylsiloxane (VPDMS) was prepared, effect high silica fiber reinforcement on VPDMS investigated. The results show that when 0.8phr DV‐DDSQ added, mass residual rate at 800°C composites increased from 40.6% to 51.0%. linear (LAR) as well (MAR) VPDMS, reinforced...

The SiO 2 nanoparticles exhibit stronger aggregate tendency in the negatively charged polymer solutions, therefore enhancing viscosity of solutions and mechanical properties their gels.

Gel syneresis is a common problem in gel treatment for oil recovery applications. In this study, stable was prepared soft brine by using water-soluble phenolic resin as crosslinker, nanoparticles stabilizer, and partially hydrolyzed polyacrylamide (HPAM) or copolymers with different contents of 2-acrylamido-2-methylpropane sulfonic acid (AMPS) groups polymers. The behavior the gels formed evaluated upon aging hard brines. results show that when salinity lower than 30,000 mg/L, expands, its...

This study was conducted to investigate the beneficial effects and possible mechanism of action mangiferin (MF) in alcohol hepatitis (AH) rats. Building on our previous study, damage-associated molecular patterns (DAMPs), lipid metabolic disorder mitochondrial dysfunction were investigated. MF effectively regulated abnormal liver function, levels alcohol, FFAs metal elements serum. More importantly, improved expression mRNA protein PPAR-γ, OPA-1, Cav-1, EB1, NF-κB p65, NLRP3, Cas-1 IL-1β,...

Summary By using an acrylamide (AM)-acrylamide propyl sulfonate (AMPS) copolymer crosslinked with hydroquinone (HQ) and hexamethylenetetramine (HMTA), a stable gel was prepared at 150℃ in simulated brine salinity of 25×104 mg/L. The gelation time, strength, thermal stability were investigated, the results indicated that dosage crosslinker key factor controlling time gel. When polymer concentration more than 0.7 wt% concentrations HQ HMTA 0.2 wt%, respectively, aged under high temperature for...

Summary A high-strength gel was prepared by crosslinking a high-concentration but low molecular weight polyacrylamide-tert-butyl acrylate (PAtBA) copolymer with polyethyleneimine (PEI), and the various factors affecting gelling were systematically evaluated. The results showed that, besides concentration of polymer crosslinker, PEI, pH value salinity gelant, temperature all affected gelation time, strength, stability. High-strength PAtBA-PEI gels could be stable for more than 240 days in...

A method for molecularly imprinted SPE of the melamine from environmental water samples was investigated. Cyromazine-imprinted polymers were synthesized in water-methanol systems selective extraction aqueous samples, followed by HPLC analysis. Molecular recognition properties and binding capability to evaluated adsorption test Scatchard analysis, which showed dissociation constant (KD) maximum quantity (Qmax) 0.032 micromol/L 4.77 micromol/g high affinity site, 0.26 19.10 lower respectively....

Abstract Bifunctional reactive polyhedral oligomeric silsesquioxane (POSS) of 3, 13‐divinyl octyphenyl (DV‐DDSQ) and 13‐dihydro (DH‐DDSQ) were used as additive to modify ethylene‐propylene‐diene rubber (EPDM), double vinyl groups or active hydrogen bifunctional POSS (brPOSS) underwent a cross‐linking reaction with the bonds EPDM, investigate effect brPOSS regulating functional group on properties EPDM. Crosslinking density, mechanical properties, thermal stability ablation performance...

The properties of a reinforced gel with partially hydrolyzed polyacrylamide (HPAM) as the main agent, water-soluble phenolic resin (WSPR) crosslinker, and nano-SiO2 stabilizer were evaluated in terms gelation time, strength thermal stability under conditions 110 °C 12.124 g/L salinity water. results showed that time high was adjustable from 3 to 23 h, remaining stable for more than 180 days stratigraphic conditions, although certain degree early dehydration gel. Cryo-scanning electron...

AbstractFor the high temperature (130 °C), pressure (30 MPa), and salinity (2.5 × 105 mg/L) of formation water conditions in target block Tarim Basin Oilfield northwest China, dodecyl hydroxy sulfobetaine surfactant was evaluated for its foaming performance, thermal stability, adsorption performance. The evaluation results showed that exhibited good ability stability than general carboxy betaine under above harsh conditions. static on surface quartz sand particles less 1 mg/g with a...

Abstract In this study, a novel high‐temperature and high‐pressure foam evaluator with variable diameters inner cell cylinder flip function was designed on our own, which can solve the problems such as difficulties in generation inaccurate determination of various parameters by same type instruments, through foaming performance more than 10 betaine surfactants evaluated. The results show that: (1) higher pressure, rate agent stable foam, but stability foamers at low high pressures,...

Mangiferin (MG) is an active component in natural medicines, and various studies have been reported on pharmacological effects, but the low solubility bioavailability of MG limit its wide application. The aim present study was to investigate pharmacokinetic profiles mangiferin monosodium salt (MG-Na) rat plasma by UPLC-MS/MS, which were then compared between two groups. An appropriate high sensitivity selectivity ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS)...

Abstract Troxipide is widely used to treat gastric ulcer (GU) in the clinic. However, a lack of systematic metabolic, pharmacokinetic and pharmacological studies limits its clinical use. This study aimed firstly explore mechanisms troxipide rats with GU compared normal control (NC) rats. First, metabolic was perormed by highly selective, high-resolution mass spectrometry method. A total 45 metabolites, including 9 phase I metabolites 36 II were identified based on MS/MS spectra....