To improve the mechanical properties and corrosion resistance of zinc coatings, zinc graphene oxide (Zn-GO) composite coatings were prepared by direct current electrodeposition method. The microstructure, mechanical properties, and corrosion resistance of Zn-GO composite coatings were systematically studied using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), uniaxial tensile testing (SSRT), and electrochemical testing, and compared with traditional pure zinc coatings. The results showed that the addition of graphene oxide significantly optimized the crystal structure of the coating, increasing the tensile strength of the coating by about 6.3% and the yield strength by about 3.2%. The corrosion current density of Zn-GO composite coating was reduced by 80% compared to pure zinc coating, demonstrating excellent corrosion resistance. Zn?GO composite coating has a long corrosion resistance life. Zn-GO composite coating has high potential for application in marine anti-corrosion.

The effect of elastic and plastic strain on corrosion behavior of X90 pipeline steel in a simulated marine alternating dry/wet environment was investigated by means of slow strain rate tensile test, in?situ electrochemical measurement, scanning electron microscope (SEM) observation and X-ray Diffraction (XRD) test. The results indicate that in the elastic strain regime, the corrosion susceptibility of X90 pipeline steel increases with the enhancement of elastic strain, but the effect is not pronounced. In the plastic strain regime, the corrosion susceptibility of X90 pipeline steel increases significantly with the enhancement of plastic strain. The most severe surface corrosion of X90 pipeline steel occurs at a plastic strain level of 5.5%. It is attributed to the mechano-electrochemical effect of X90 pipeline steel under external stress. The corrosion mechanism is anode dissolution dominated and hydrogen evolution assisted. The result of corrosion product analysis show that strain has no significant effect on the type of corrosion products.

Taking well group M of E+K block of YH condensate gas reservoir as a typical example, a numerical simulation model of a typical well group was established to study the main controlling factors and mechanism of EOR by gas injection. The effects of different factors including injection?production positions, injection medium, gas injection volume, injection?production ratio, gas injection timing and pressure recovery degree, on the production performance was simulated and the gas injection scheme of the well group was optimized. The results show that the development of retrograde condensate gas reservoir is optimized under the conditions of "up?down production", cyclic gas injection, gas injection volume（30.50～36.60）×10⁴ m³/d （annual gas injection volume is 2.50%~3.00% of the original geological reserves） and maintain high formation pressure (depleted to no less than the dew point pressure). The research results can provide a basis for the policy formulation of EOR technology in the middle and late stage of gas injection development of YH retrograde condensate gas field and provide guidance for the development adjustment of the gas field in the middle and late stage.

According to the characteristics of the canteen, the FLACS software was used to build a three?dimensional model for a university canteen. On the basis of considering the jet direction, obstacles and other factors, the leakage and explosion of natural gas were simulated, and the diffusion process of gas cloud, the development law of explosion shock wave and temperature in a specific scene were studied. The results show that when the gas leaks vertically upward, the gas accumulates in the small booth due to the obstruction of the canteen roof. When the natural gas leaks horizontally, the volume fraction of natural gas cloud in the dining area is higher. At the initial stage of the explosion, the explosion pressure shock wave centered on the ignition point first appears, and the pressure shock wave travels outward in a circular arc. The leakage direction has little effect on the maximum over pressure generated by the explosion.The temperature distribution is greatly affected by the direction of leakage. When vertical injection is carried out, the high temperature is concentrated in the small booth. When horizontal injection is carried out, the temperature is distributed from high to low.