Disconnect RKVO is applied for sectional running in of a casing string 168 mm with the
option of reaming with rotation and washing out during the first section RIH.
While using a disconnect RKVO 168 the following process operations are performed:
• the disconnect RKVO and the provided tool set (accessories) are run in as a part of a
liner 168 mm on a drill pipe string with inner diameter not less than 100 mm;
• reaming with rotation to the right and washing out if necessary;
• performance of the liner cementing with start of the cementing plug after pumping in
of cement slurry for its separation from the displacement fluid;
• displacing the cement slurry to the outer casing annular space until receiving the
“bump” signal;
• hydraulic disconnection of the section from the drill string through internal overpressure
build-up;
• mechanical disconnection by string rotation to the right if hydraulic disconnection is
impossible;
• washover and drill string pulling out;
• the second section running in and hermetical connection to the first section;
• cementing ports opening in MMC1.168 collar and the second section cementing with
a cementing plug start and closing of ports after receiving the “bump” signal.