| 摘要 |
<p>A well tool apparatus includes a housing adapted to be connected in a pipe string. A mandrel is slid ably received in the housing and adapted to be selectively telescoped between first and second positions relative to the housing. The mandrel has a slow passage there through and has a lateral bypass port communicating the flow passage with an exterior surface of the mandrel for allowing well fluids to bypass the flow passage of the well tool as the tool is being lowered into a well. A reversible removable sliding sleeve is disposed about the exterior surface of the mandrel and is constructed to abut the housing and to be thereby moved from a first position wherein the bypass port is open to a second position wherein the bypass port is closed upon telescoping collapsing movement of the housing relative to the mandrel. The sliding sleeve has a latch on one end thereof. With the sleeve in a first orientation relative to the mandrel, the latch is arranged to engage a latch engagement of the mandrel so as to lock the bypass in a closed position upon the first telescoping collapsing movement of the tool. In a second arrangement, the sliding sleeve is reversed in its position relative to the mandrel so that the latch of the sliding sleeve is always latched to the housing, thus providing a tool wherein the bypass port may be repeatedly closed and opened upon repeated telescoping collapsing and extending movements of the tool. A final arrangement of the tool allows the bypass port and the sliding sleeve to be completely removed to eliminate the bypass.</p> |
