Well wall washing device

The invention discloses a well wall washing device relating to the field of petroleum and natural gas well drilling. The well wall washing device comprises a body, a sliding part, an elastic element, a first structural member and a second structural member, wherein the body is provided with a first flow channel; and a first through hole communicated with the first flow channel is formed in the side wall of the body; the sliding part is arranged in the first flow channel and can slide relative to the body; a through second flow channel is arranged in the sliding part; and a second through hole which can be communicated with the second flow channel is formed in the side wall of the sliding part; the elastic element is arranged between the sliding part and the body; the first structural member is detachably connected to the body and is provided with an opening/closing part; and the second structural member is detachably connected to the first structural member and is provided with a through fourth flow channel that can be communicated with the second flow channel; the opening/closing part is controlled to open/close through the first structural member and the second structural member and the disconnection or connection of the first through hole and the second through hole is further controlled; and finally, the aim of washing the well wall is achieved. The well wall washing device can be used for washing the well wall or the inner wall of a blowout preventer under the condition that the normal well drilling operation is not influenced, and furthermore slurry and settled sand attached to the well wall or the inner wall of the blowout preventer are eliminated.