Abstract: Not all the oil layers can be effectively filled with traditional top-down sand filling mode. Therefore, workover well bottom filling and completion technology is developed. The filling effect of each layer is enhanced by adopting top-down mechanical filling sand control method through developing large-bore hanger and bottom filling tools; meanwhile, the technology makes up for some shortages that sand filling can not be carried out in screen pipe completion after ordinary workover.The technology provides a very effective sand control method, enhancing recovery ratio of oil-gas wells greatly, so it has a broad application prospect.