Water-plugging process tubing string and method of horizontal wells

The invention relates to a water-plugging process tubing string and method of horizontal wells. The tubing string comprises an oil tube, an elastic centralizer, a safety connector, a setting tool, a plug tube, a plug tube type packer and a rotatable bridge plug. The elastic centralizer and the safety connector separately sleeve the tail end of a horizontal segment of the oil tube. The elastic centralizer is located at the left end of the safety connector. The horizontal segment of the oil tube is connected with the plug tube type packer through the setting tool or the plug tube. The rotatable bridge plug is located at the right end of the plug tube type packer, and a gap is reserved between the rotatable bridge plug and the plug tube packer. The tubing string is simple in structure, waiting-on-cement under pressure is available for a high-strength plugging agent, and a plug face can be reserved in a high-strength plugging agent casing in a horizontal well.