Patent ID: 7484559
Filing Date: 2009-02-03
Classification: E21B

Abstract:
1. An apparatus for use in cementing a casing string in a well, the apparatus having a pre-deployment position prior to insertion in the casing string comprising: a pump down body adapted to be pumped down the casing string to a landing location, the body having an axial passage therethrough to enable cement to be pumped through the body and up an annulus surrounding the casing string; a plug fixed in the axial passage to allow fluid pressure in the casing string above the body to pump the body downward, the plug being releasable from the axial passage in response to increased fluid pressure in the casing string above the body after the body reaches the landing location; and a flapper valve mounted to the body, the flapper valve allowing downward flow of cement through the passage and blocking upward flow of cement from the annulus.