To address the technical challenge that conventional polyacrylamide fracturing fluids cannot simultaneously deliver desired performance of friction reduction and proppant carrying in deep tight/shale oil reservoir，an associative friction reducer SMAP-2000 was prepared and compared with conventional ultra-high molecular weight polyacrylamide friction reducer HPAM-3000. The thickening，friction reduction，dynamic proppant carrying and rheological properties of the two friction reducers were systematically evaluated，and a low friction high proppant carrying supramolecular fracturing fluid was developed. Results show that SMAP-2000 exhibits better thickening efficiency than HPAM-3000 in both fresh water and simulated brine，with significantly lower dosage required to achieve the same apparent viscosity. Within the tested viscosity range，the friction reduction rate of the low viscosity slickwater of SMAP-2000 is similar to that of HPAM-3000，but the friction reduction rates of SMAP-2000 are significantly higher for medium and high viscosity slickwater and linear gel. With the same apparent viscosity，the dynamic proppant carrying capacities of low，medium and high viscosity slickwater of SMAP-2000 is 10%-16% higher than those of HPAM-3000. SMAP-2000 exhibits shear thickening at low shear rates，with a multi-stage rheological structure of “shear thickening-shear thinning-second plateau”. The elastic modulus of 30 mPa·s linear gel of SMAP-2000 is 60%-80% higher than that of HPAM-3000，indicating the characteristics of supramolecular solutions. Field test shows that the wellbore friction of the test well using SMAP-2000 fracturing fluid is reduced to 1.8 MPa/1 000 m，with a friction reduction rate of 85%，the maximum proppant concentration increased to 400 kg/m³，and the daily oil production per well increased by 40%. The developed fracturing fluid system balances friction reduction and proppant carrying to provide technical support for cost effective development of deep tight/shale oil reservoirs.

The post-frac flowback and production of the alkali-salt layers of Fengcheng Formation in Mahu Sag suffer from wellbore salt deposition，but the salt deposition law remains unclear. Therefore，through static and dynamic salt precipitation evaluation experiments，the reservoir conditions affecting the salt precipitation rate and the impacts of flow rate and gas production on wellbore salt deposition in the production process are investigated to clarify the wellbore salt deposition law. The results show that the three typical salts，with their solubility from most to least sensitive to temperature，are sodium carbonate，sodium bicarbonate and sodium chloride. Moreover，the boundary conditions （total salinity and ion composition） and salt crystal types of salt crystal precipitation are defined for composite salt solutions with different compositions. Under the same salinity，the precipitation degrees of composite salts with different compositions are between those of the individual salt，and the priority orders of salt precipitation are sodium bicarbonate，sodium carbonate and sodium chloride，which is consistent with the change of solubility of various salts with temperature. With the increasing flow rate and gas production，the salt deposition first grows and then declines. The salt deposition peaks in the case of the daily liquid production of 40 m³/L and the gas-liquid ratio of 200 m³/L.The study on the salt deposition law in alkali-salt wells helps to set reasonable drainage parameters，delay the salt deposition during flowback，ensure the smooth completion of formation testing after fracturing，and provide a theoretical basis for on-site salt prevention measures in the later production from Fengcheng Formation alkali-salt layers.

Proppant is the key material for propping hydraulic fracturing，and its performance has a significant impact on the effect of fracturing stimulation，so the research on fracturing proppants has received extensive attention. This paper summarizes the research and application of fracturing proppants and related technologies，including conventional proppants such as quartz sand，ceramic proppant，and coated proppant，as well as new types of proppant and related technologies such as self-suspension proppant，gas-suspension proppant，and in-situ generated proppant reported in recent years，totaling 10 categories. Last but not least，the paper looks into the future development directions of proppants and related technologies to provide reference for researchers of proppants and further accelerate the development of proppant technology.