| 摘要 |
A method and apparatus for temporarily increasing fluid pressure at a specific location in a work string to perform an operation in an oil or gas well bore. Apparatus is provided which, in a first position provides fluid flow through the work string; in a second position provides the desired increase in fluid pressure to perform the operation in the well bore by dropping a ball ( 62 ) into the apparatus; and, by shearing pins ( 52 ) to move a sleeve ( 50 ) within the apparatus, provides a third position which returns fluid flow through the work string via bypass channels ( 26 ) created in the apparatus around the ball. Operation of a pressure activated near bit reamer in conjunction with the apparatus is also described.
|
