In order to explore the stratigraphic situation in the northern part of the Songliao Basin and evaluate and predict the oil and gas prospects of the Perom-carboniferous system， our team participated in the implementation of four oil and gas geological survey wells in the area， with a design depth of 2000m. Our team used the small diameter wire-line core drilling process for full hole coring， and successfully completed the design requirements in terms of technical indicators such as heart rate and coring quality. Due to the complex sedimentary strata in the northern part of the Songliao Basin， most of which are mudstone and sandstone formations that are prone to hydration， complex well accidents such as collapse， block falling， and shrinkage occur， which affect the progress of drilling accidents and the quality of coring. To ensure the smooth implementation of drilling， our team further optimized the drilling tool combination and drilling parameters based on the drilling formation conditions during the drilling process， selected a film forming and anti collapse flushing fluid system with strong wall protection performance， and successfully completed the drilling construction task and achieved good drilling results.