In addressing the problems of intermittency and instability in the conventional utilization of solar energy，this paper introduces the research progress of the photothermal technology applied in photothermal power generation and direct solar thermal utilization for stable solar heat supply by employing heat storage systems，and summarizes the classification methods and application scenarios of current heat storage technologies. This study reviews the technical principles and research progress of the mainstream molten salt heat storage systems （carbonate，chloride，fluoride and nitrate），pointing out the advantages and technical problems of different molten salt thermal storage systems. Aiming at the core of the molten salt thermal storage technology，it summarizes the research status and process flow of photothermal technology in different scenarios. This paper also generalizes the development trends of molten salt thermal storage systems in the photothermal field. First，suitable heat collection modes are selected according to application scenarios，and the capacity configuration and coordination control of solar heat collection and molten salt thermal storage are optimized. Second，molten salt with lower melting points，wider liquid temperature range，and low corrosion is developed to improve the applicability of molten salt thermal storage. Third，the operation safety and stability of the molten salt energy storage system can be ensured while costs are lowered. This provides a reference for the future application and development of the molten salt thermal storage technology.

At present，there are 3 types of oil production well sites in Xinjiang Oilfield，which are platform well，single well and cluster well sites. Pumping units and rodless pumps are main energy-consuming equipment，and electric heaters also consume some power. It has become the current trend to replace traditional energy sources with solar energy，because it is clean，harmless，and basically con- sumes no energy. Nevertheless，solar energy also has the disadvantages of poor continuity and stability，low energy density，high cost， large footprint and the necessity for outdoor installation. A distributed solar photovoltaic power generation test and modification was conducted on the oil production platform XY6 in Jimsar of Xinjiang Oilfield. The designed installed capacity is 8 kW. The in-situ gen- erated power is supplied to the power-consuming equipment located at the well site for self use，with the surplus power connected to the grid. In case of power shortage，power will be supplied from the grid. The layout of photovoltaic modules was decided after the optimum dip angle was calculated by designing the modules in series and parallel. In addition，an analysis was conducted by comparing with the data simulated by Pvsyst 7.2 to provide a detailed reference for the overall photovoltaic layout of the platform. By the end of the first quarter of 2022，about 3，000 kW·h power had been generated，and about 20，000 tons of carbon dioxide emissions had been reduced.

Horizontal well fracturing is a key technolohy for the commercial exploitation of shale oil reservoirs， and the productivity after fracturing has always been the study focus of many scholars. A traditional shale oil productivity model ignores the influence of bedding fractures formed during fracturing on productivity. In response to this problem， the related theory of embedded discrete fracture model is introduced to establish a three-dimensional horizontal well productivity model for shale oil reservoirs with bedding fractures considered. The model is discretized based on finite-difference， and the pressure distribution and typical productivity curves in reservoir matrix and fractures are obtained by MATLAB programming. The influence of permeability and fracture density on shale oil productivity is analyzed. Studies show that productivity increases with the increase in the permeabilities of bedding fractures， and with the increase in the density of bedding fractures. When the permeability of bedding fractures is relatively high and developed， great error will be resulted in if no bedding fractures are included in the productivity model. The model in this paper is of important practical significance for accurately predicting the productivity of shale oil reservoirs after fracturing. 

The fracturing flowback fluid in Sulige Gasfield is characterized by large volume，complex composition and great difficulties in treatment. After being treated by simple processes of oxidation，flocculation and sedimentation，the fracturing flowback fluid still fails to meet the standard for direct discharge or recycle. Besides，the need for storage of the treated fluid makes the operating cost increase. Therefore，more processes such as reduction and adsorption are added，so that the treated fluid can meet the standard for repreparing new fracturing fluid. Experimental results show that the concentrations of boron，calcium and magnesium ions which impair the performance of fracturing fluid in the treated fluid are obviously reduced and the quality of treated fluid is obviously improved. The re-prepared fracturing fluid system has a viscosity of 150 mPa∙s，satisfactory compatibility and gel breaking performance，and an average damage rate of about 17%. All of these indicators meet the requirements in relevant standards. In addition，the recycle technology of fracturing flowback fluid has been successfully applied in Sulige Gasfield.