Morphology regulation is an important way to improve the performance of electrocatalytic hydrogen evolution reaction. This paper investigated the effect of NiCoP with different dimension on the hydrogen evolution reaction by combining theoretical calculation and experimental analysis methods and constructed structural models of 1D nanowires (NW?NiCoP) and 2D nanosheets (NS?NiCoP).Simulation results show that NW?NiCoP exhibits higher electronic density of electronic states near the Fermi level, which is beneficial to efficient charge transfer. NS?NiCoP features higher hydrogen adsorption energy, which is favorable for the Volmer reaction.NW?NiCoP,NS?NiCoP,and 3D nanosheet?wires (NSW?NiCoP) were prepared by hydrothermal and phosphating processes. Electrochemical tests on NiCoP with different dimension indicate that the overpotential is 45 mV for NSW?NiCoP at -10 mA/cm².

Solid oxide electrolysis cell (SOEC) technology can realize the efficient and flexible conversion of electrical and thermal energy to chemical energy on the basis of solid electrolytes. It can be connected with renewable energy sources such as solar and wind power and tidal energy to utilize the excess electricity generated for efficient, clean, and large?scale production of hydrogen. When coupled with the CO₂ capture process, it enables the co?electrolysis of CO₂ and H₂O to produce syngas. In addition, it can be combined with large?scale industries to produce high?value?added chemicals such as ethylene, ammonia, and formaldehyde with low?value?added raw materials generated. SOEC technology can meet the needs of the future society for the large?scale renewable energy conversion and storage,which is of great significance for accelerating the substitution process of non?fossil energy worldwide and the realization of China's carbon peak and neutrality goals. This paper mainly discussed the electrode and electrolyte materials used in solid oxide electrolysis technology, the application scenarios and principles at the current stage, and the challenges faced. Moreover, it predicted the future development directions of the technology.

Formation damage control of Hutubi underground gas storage (UGS) presents a serious challenge due to low formation pressure coefficient and reservoir deep invasion of wellbore working fluid under large pressure difference during drilling and completion. Mineral composition analysis, expansion capacity, wettability and permeability reduction after spontaneous imbibition measurement of reservoir rocks were conducted to reveal formation damage mechanism of Hutubi UGS. That is the clay minerals hydrated swell and dispersion of water?sensitive formation and water?blocking effect of tight sand reservoir. Drilling fluid technical countermeasure of improving inhibition, weakening liquid wettability and enhancing temporary plugging was put forward. Amine inhibitor and surfactant ABSN were selected to optimize the current used drilling fluid. Temporary plugging particle size fraction distribution was determined based on the “optimal filling” bridging plugging theory. Laboratory and field evaluation show that the optimized drilling fluid is suitable for perforation and screen pipe completion with a permeability recovery more than 90% and effective inhibition of clay swell. The results provide reference for improving formation damage control effect of depleted gas reservoir drilling and completion.

In order to explore the water control mechanism of buried hill crack reservoir section, taking Huizhou 26?6 condensate field as an example,the fracture gas reservoir water control physical experiment model,equilibrium gas water interface and piecewise water control experiment evaluation were established,through designing the experimental parameters,buried hill crack formation and water control process.The results show that the segmented water control can effectively prolong the water?free gas production period and delay the water breakthrough time to a certain extent.The different combination of crack and horizontal well section would induce diverse gas production characteristics.Coupling between horizontal well subsection water control and gas reservoir seepage was a complex process.The matching between blind pipe section and production section directly affects the gas well productivity.The opening degree of production section,the length and the location of blind pipe section are the main factors affecting the productivity of fractured gas reservoir.The research results will establish a sublevel water control development model for buried hill gas reservoirs and provide good technical support for rational and scientific research on water control of horizontal wells in offshore condensate gas fields.

In view of the large fluctuation of the gas turbine load in the distributed energy system, the current researches on Organic Rankine Cycle (ORC) pay more attention to the comparison of the thermal performance of the same heat absorption with the initial parameters, but rarely consider the impacts of decrease in both flue gas temperature and mass flow rate on system performance causing by the gas turbine load reduction. Based on the characteristic model constructed by HYSYS platform, optimization scheme of the variable working condition ORC working medium was studied using the narrow⁃point temperature difference in the heat exchanger as the constraint condition. Under the variable load condition of gas⁃fired power plants, the operating parameters of the maximum net output power of the system are optimized. The cycle performances of varies working fluids with different compositions were compared of the characteristics of heat rate, mass flow and AP. The net output of R152a system shows obvious advantages on the heat rate and mass flow rate, compared with that in the mixed working medium in the selected working condition range, while the condenser AP value and the system heat recovery rate exhibit opposite performance. This work provides a reference database for the studying of the binary non⁃azeotropic mixture of ORC system.

In order to enhance the effect of acid fracturing and provide possibility for oil and gas production increase in oilfield,the dissolution rate, dissolution ratio,dissolution quality, permeability improvement rate and fracture conductivity of the FF⁃01 acid system to core were studied by means of dissolution and acid dissolution,with the core of Yanchang oilfield as the main source. The damage to the core and the corrosion of the pipe fittings were analyzed.In addition, the surface tension of the residual acid and the apparent viscosity before and after the acid reaction were investigated.The results show that 25% of the FF⁃01 environmental acid has a better corrosion inhibition effect,the permeability improvement rate of the core after treatment with FF⁃01 is 288%,and the conductivity of the core is enhanced. After the reaction with cuttings, the residual amount of FF⁃01 environmental acid is 1/6 of the amount of HCl residue.The corrosion rate of the FF⁃01 environment⁃friendly acid on steel and the surface interfacial tension after acid reaction and the viscosity of residual acid are all low,which meet the requirements of environmental protection.