Abstract: As a representative of high-porosity and high-permeability sandstone reservoirs in the extremely shallow sea area of Bohai Bay, Zhaodong Oilfield is faced with the problems of low degree of diagenesis, loose cementation, medium to strong water sensitivity, medium to weak velocity sensitive damage, and is easy to be damage by external solid invasion. In order to maximize the potential of the reservoir, reduce the damage of the reservoir and realize the protection of the reservoir, based on the concept of integration, the KCl polymer water-based drilling fluid system and the non-solid water-based FLO–PRO reservoir drilling fluid system were tested through the indoor recovery of cuttings and core permeability recovery experiments, and it was found that the former could reduce the shale expansion rate by 81.40% and the core permeability by 88.21%, and the latter could restore the reservoir permeability to 100.00%. In practice, the cementing operation uses a low-density, low-temperature, ultraearly, and high-strength cement slurry system. Before the completion operation, the borehole was cleaned by a combination of physical and chemical methods; Clean KCl brine that has undergone two stages of filtration is used as the completion fluid during completion operations. The integrated reservoir protection technology effectively reduces the damage of external solids to the reservoir in all aspects of drilling and completion operations, maximizes the reservoir protection in the whole process, ensures safe and efficient well construction, reduces complex accidents and non-production time, and realizes the sustainable and profitable development of different water-cut stages of the oilfield..

Key words: pay zone protection, integrity, screening temporary plugs, gel-breaking, two-stage filtration