Bridge plug with large drift diameter

• Main Authors: ZHAO JUNFENG, LIU LEI, ZOU GANG, ZHOU XIN, RONG JIAJIA
• Format: Patent
• Language: English
• Published: 13.05.2015
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

A bridge plug with the large drift diameter comprises a sleeve, a central tube, a rubber sleeve, an upper cone and a lower cone. The rubber sleeve sleeves the central tube on the outer wall, the upper cone and the lower cone are respectively arranged at two ends of the rubber sleeve, and the section of the top of the upper cone and the section of the bottom of the lower cone are conical and are respectively wedged into gaps of the upper and lower slips and the central tube. The bridge plug is characterized in that the upper portion of the inner wall of the central tube is provided with a transition section with the inner diameter shrinking from top to bottom, the section of the transition section is a conical surface with the conicity ranging from 12 degrees to 13 degrees, the diameter of one section of the central tube with smaller diameter is not less than 70mm, and a dissolvable ball is arranged at the position of the transition section. The bridge plug has the advantages that drill-grinding is omitted, the dissolvable ball can be completely dissolved by injecting electrolyte solution, and the large drift diameter of the bridge plug is reserved for subsequent production use.