Abstract: A reducing support ring for a bridge plug and a bridge plug for sealing or packing boreholes or wells. The reducing support ring for the bridge plug includes a ring-shaped body with a setting surface provided on a circumferential outer wall or end face of the ring-shaped body. Deformation of the ring-shaped body under an axial compression force allows the setting surface of the ring-shaped body to be abutted against and positioned on an inner wall of a sleeve where a bridge plug is located and to form a surface contact-type sealed connection with the inner wall of the sleeve. The bridge plug includes the reducing support ring. The reducing support ring and the bridge plug improve the plugging effect and anchoring performance of the bridge plug and the convenience of construction.

Abstract: A central shaft for a bridge plug, the bridge plug and a setting method for the bridge plug are disclosed. The central shaft comprises a setting mandrel and a setting tubular shaft, and the setting tubular shaft includes a squeezing shoulder for squeezing a compression ring or a reducing support ring of the bridge plug, and a support trunk. After the setting mandrel is disconnected from a downstream-end support, the setting mandrel can be withdrawn from the central hole of the setting tubular shaft so that the central hole of the setting tubular shaft forms an internal fluid channel of the bridge plug.

Abstract: The present disclosure discloses a central shaft for a bridge plug, a bridge plug and a setting method for the bridge plug, and relates to the technical field of bridge plug. The present disclosure addresses the technical problems existing in the prior art that degradable plastics and degradable metal materials are unable to manufacture a bridge plug with a large inner diameter.

Abstract: A reducing support ring for a bridge plug and a bridge plug for sealing or packing boreholes or wells. The reducing support ring for the bridge plug includes a ring-shaped body with a setting surface provided on a circumferential outer wall or end face of the ring-shaped body. Deformation of the ring-shaped body under an axial compression force allows the setting surface of the ring-shaped body to be abutted against and positioned on an inner wall of a sleeve where a bridge plug is located and to form a surface contact-type sealed connection with the inner wall of the sleeve. The bridge plug includes the reducing support ring. The reducing support ring and the bridge plug improve the plugging effect and anchoring performance of the bridge plug and the convenience of construction.

Abstract: A process of preparing a double-sterilized immunoglobulin product for intravenous injection includes dissolving Cohn's component II in distilled ice water, and adjusting to the desired pH using acetic acid. A filter is used to remove alcohol and salt and establish a desired sodium ion concentration, and the immunoglobulin concentration is adjusted to form interim product, which is bottled. The bottle is filled with gaseous carbon dioxide to achieve a pressure of 0.7 to 200 kPa, sealed in the absence of any protectant, and sterilized. The interim product is filtered, concentrated to achieve an immunoglobulin concentration of 5% to 10%, adjusted to a desired pH, filtered to remove bacteria, and stored at room temperature for 21 days. Glucose is added in order to change the osmotic pressure equilibrium of said interim product to form final product.