| 摘要 |
A liner cementing system and method provide for a landing collar 10 with a bypass passageway 45. Circulation port 62 in collar 10 permits initial circulation through the liner 17 until a pump down plug P1 is pumped therein to seal off circulation therethrough. An increase in pressure in the liner bore 51 acts on a piston 50 until shear ring 48 is sheared at a selected pressure. Cement 90 may then flow through the bypass passageway 45 into a cement shoe 104 and into an annulus 74 to cement the liner 17 in place. Pump down plug P2 seals off the bypass passageway 45 to stop flow into the annulus 74. The closing of circulation port 62, the opening of bypass port 53, and the closing of bypass port 53 produce pressure signals at the surface which may be used to analyze cement job success.
|
