Research on High Performance Drilling Fluid System in Shale Reservoir and Evaluation of Environmental Pollution Performance
With the increasingly strict environmental requirements,the application of oil-based drilling fluids in horizontal well drilling in shale reservoir is more and more limited.Therefore,by developing environmentally friendly shale inhibitor APG-Ⅱ and combining with other environmentally friendly treatment agents,a high-per-formance water-based drilling fluid system suitable for shale gas horizontal wells was studied,and its comprehen-sive performance and environmental pollution performance were evaluated.The results show that the drilling fluid system has good temperature resistance,fluid loss reduction,lubrication and inhibition properties.After aging at 140 ℃,the rheological properties of the drilling fluid are stable,the HTHP water loss is less than 5 mL,the ex-treme pressure lubrication coefficient is less than 0.09,and the primary recovery rate of cuttings rolling is greater than 95％,and the secondary recovery rate is greater than 91％.The system has strong anti-pollution performance.The content of petroleum substances,biotoxicity,biodegradability and heavy metals of the on-site high-perform-ance water-based drilling fluid system can meet the standard requirements,and the pollution to the environment is relatively small,and the environmental performance is obviously better than that of the on-site polyamine drilling fluid and polysulfonate drilling fluid system.The application process of the high-performance water-based drilling fluid in the horizontal section of YC-1-B well was successful,and the performance of the drilling fluid was basi-cally equivalent to that of the oil-based drilling fluid,and good drilling effect was achieved while meeting the re-quirements of environmental protection.
shalewater based drilling fluidinhibitorsanti-pollution performanceenvironmental performance
万方数据
维普
