Abstract: The present disclosure relates to a cementing plug comprising a first plug body (bottom plug), a second plug body (top plug), and a plurality of cleaning portions. The first plug body comprises: a first body provided therein with a chamber opening towards a lower end thereof, and an upper end of the first body being provided with a pressure portion; and an anti-rotation portion provided on an inner wall of the first body, and capable of being connected to slurry entering the chamber to limit a rotation of the first plug body. The second plug body comprises a second body. The plurality of cleaning portions is provided on outer sidewalls of the first body and the second body along a length direction thereof, for scraping off residuals (mud cake) on an inner wall of a casing.
Type:
Grant
Filed:
January 8, 2018
Date of Patent:
October 20, 2020
Assignees:
China National Petroleum Corporation, CNPC Engineering Technology R&D Company Limited, Beijing Petroleum Machinery Co.
Inventors:
Hongying Zhang, Na Wang, Yanfu Huang, Lin Shi, Ping Yu