China National Petroleum Corporation

Cnpc Engineering Technology R&d Company Limited

Beijing Petroleum Machinery Co.

Cnpc Drilling Research Institute

Beijing Petroleum Machinery Factory

Yanfu Huang

Chen Wang

Ping Yu

Na Wang

Tiejun Li

Lin Shi

Chunhua Zhang

Guanghua Liu

Chengqin Sun

Zhiyong Zhou

Xingming Pan

Xinli Liu

Zhangjian Li

Shikai Tao

Wenjing Yang

Qingkui Wu

Lianyang Zou

Guoxing Yan

Hongjiang Shi

Hongying Zhang

Qian Shi

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.

Cementing plug

An information transmission apparatus for logging while drilling comprises a hollow drilling rod and at least one cable. The drilling rod comprises at least one first drilling rod member and at least one second drilling rod member spliced to each other alternately. The first drilling rod member comprises a through hole, and the second drilling rod member comprises a stepped hole. The cable comprises a fixed end, a connected end, and a folded portion connect the fixed end to the connected end. Each of the cables is fixed in the stepped hole through a fixed end or is connected to a connected end of an adjacent cable. The connected end may be stretched along the stepped hole, and stretched through the through hole to be electrically connected to a logging instrument or a fixed end of the adjacent cable. The apparatus provides protection for a cable through a hollow drilling rod, thereby improving the transmission reliability.

Information transmission apparatus for logging while drilling

Growing community of inventors

Beijing, China

Yanfu Huang