| 摘要 |
A cutting tool has been invented for use in a wellbore to cut formation through which the wellbore extends or to cut items in the wellbore, the tool having, in one aspect, a body disposable at a desired location in the wellbore, at least one first blade pivotably mounted to the body at a first height on the body, at least one second blade pivotably mounted to the body at a second height on the body, the second height above the first height, the blades movable from a first position against the body to a second position extending out from the body for cutting, and the first blades shorter in length than the second blades. |
