Disconnect RKVS is used to disconnect the transport string while RIH the flush casing
(liner). RKVS is applied in holes with casing strings which diameter is 245 and 324 mm
where liners of casing pipes with diameter 168 mm are run in.
While using a disconnect RKVS the following process operations are performed:
• the disconnect RKVS and the provided tool set (accessories) are run in as a part
of a liner 168 mm on a flush transport pipe string with inner diameter not less than
150 mm or on drill string 5”;
• 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;
• disconnect off-loading (setting) on funnel which has been mounted in a casing
string 324 mm;
• liner disconnection from the transport string by mechanical rotation of the string
to the right;
• washover and transport string pulling out.
Disconnect operating medium is drilling mud and cementing slurry treated by chemical
reagents, oilfield brine, oil and gas at 100 °C temperature.