| 主权项 |
1. A downhole system for a well producing hydrocarbon-containing fluid, comprising:
a casing comprising a first casing part and a second casing part, the second casing part having a casing thickness and comprising at least one sleeve having an inner face, and the second casing part being substantially a monobore in that the second casing part has an inner diameter which varies by less than twice the casing thickness, a drop device for being immersed into the casing having at least one sleeve having an inner face, the drop device comprising:
a body having a width,a leading end, anda trailing end,wherein the body further comprises an expandable sealing element arranged between the leading end and the trailing end, moving from a first position in which fluid is allowed to pass the device and a second position in which the sealing element abuts the inner face of the sleeve and seals off a first zone in the well from a second zone in the well. |
