In order to improve the success rate of high temperature and complex formation structural oil wells, the preparative temperature sensitive self?consolidation resin is used to modify the surface of the aggregate material, and the thermally consolidated rigid plug material is obtained, then auxiliaries are chosen to build a novel bridge sealing and thermal consolidation plugging system that could resist temperature to 190 ℃. Infrared spectroscopy, thermal analysis, scanning electron microscopy were employed to study the molecular structure, microstructure and thermal stability of the resin, thermally consolidated rigid plug material and the plugging system, the suspension stability, consolidation rate, consolidation strength and permeability of the plugging system were also investigated. The results show that the constructed plugging system has the advantages of good suspension stability and wide solidification time window in bentonite slurry with mass fraction of 5%, and the compressive strength of the solidified body after curing at 90~190 ℃ are all over 6 MPa; at the same time, the water phase permeability of the solidified body cured at 190 ℃ is 6.32×10³ μm² under the driving pressure of 12 MPa, and the plugging rate is more than 98.00%. It is expected to meet the plugging requirements of high?temperature formation.

UiO?66 has the high specific surface area and porosity, which was selected as a carrier in this study. The impregnation method by loading nano?metal Cu particles was used to prepare the composite catalyst UiO?66/Cu. X?ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and other methods were carried out to characterize the prepared catalysts. Different loads and dosages catalytic effects in catalytic reduction were investigated in this study. The concentration of p?nitrophenol was 5×10^-5 mol/L and the dosage of UiO?66/Cu?10 was 10 mg/L, which were the optimal solutions for catalytic effect. Catalytic reduction efficiency of p?nitrophenol could reach more than 97.0% in 5 minutes.

Energy shortage and environmental pollution have always been the focus of the world's attention. The use of oil, natural gas, and electricity to heat crude oil has high energy consumption and serious environmental pollution. Solar energy, as sustainable and clean energy, has become the focus of researchers from all over the world.Thus, a solar heating crude oil system was designed, and safe and easily available air was selected as the heat transfer fluid. The system consists of a solar receiver, a heat accumulator, a crude oil heat exchanger, and an electro?thermal furnace. The heat receiver receives solar radiation and the temperature rises. The air passes through the heat absorber to obtain high temperature, and the high temperature air enters the heat exchanger to heat the crude oil. A mathematical model for the analysis of the thermodynamic performance of the solar heating crude oil system was established, and the model was verified. Then, the Aspen Plus software was used to conduct thermodynamic analysis of the heatingprocess. The results show that the compressor and the preheater are the components with large exergy loss. When the pressure ratio of the compressor is 2.7, the system reaches its best state. At this situation, the thermal efficiency is 72.35%, the exergy efficiency is 73.89%, and the waste heat recovery efficiency is 72.33%.

With the rapid development of human?computer interaction, electronic skin, wearable electronics and other emerging fields, flexible strain sensing materials as one of the core components have become the hot spot of the current research. The conductive polymer composites composed of conductive material and flexible polymer have the advantages of good flexibility, light weight, easy processing and forming, and the conductive property of the material changes under strain stimulus, so it can be used as flexible strain sensing material. This paper reviewed the classification and characteristics of flexible strain sensing materials based on conductive polymer composites, introduced the strain response mechanism of different sensing materials in detail, and summarized the factors that affect the strain sensing performance of conductive polymer composites.

In this paper, the heat treatment process of carburizing and quenching of 20CrMnTi steel gear was simulated by DEFORM?HT software, and the carbon mass fraction change from the surface layer to the core after carburization was obtained. The changes in the martensite structure after quenching were analyzed, the residual stress after quenching was analyzed, the appropriate quenching cooling medium was selected, and the metallographic structure and the Rockwell hardness from the surface to the core were measured through experiments. The results show that the metallographic structure and Rockwell hardness are in good agreement with the simulation results, which have certain guiding significance for production.

The C12-C16 olefin fractions were separated by distillation from coal chemical mixed olefins. The obtained C12-C16 olefins were used as raw materials to synthesize polyalphaolefin (PAO) by AlCl₃ catalyst. The influence of polymerization temperature, polymerization time, polymerization pressure and amount of catalyst were researched. The optimum polymerization conditions were determined. The physical properties of the product were analyzed. The results show that the evaporation temperature of C12-C16 olefins in cold trap oil is 214~274 ℃. Under the conditions of polymerization temperature of 137 ℃, polymerization time of 40 min, polymerization pressure of 4.0 MPa and catalyst mass of 10 g, the polymerization yield is 84.57%, and the kinematic viscosity of obtained PAO product at 40 ℃ is 32.53 mm²/s, the flash point is 221 ℃, the freezing point is -53 ℃, and the bromine value is 9.6 g(Br)/(100 g) .

This paper mainly studies a technical method for detecting the metal content in oil, that is, the combination of microwave digestion and ICP?AES detection technology. Studies have shown that the method has good applicability to the elements measured in the sample, and each element has a good linear correlation with its mass concentration, both greater than 0.999, and the detection limits of iron, manganese, and lead are 0.005 0 mg/L, 0.000 3 mg/L, 0.007 0 mg/L. The reliability of the data obtained by the method was verified by the spiked recovery experiment and the precision of the experimental method. The relative standard deviation of each element was less than 2%, and the recoveries were between 94.1% and 107.6%. Compared with the conventional single detection method, the detection method constructed in this paper has the characteristics of high sensitivity, fastness and high precision.