Method for Zone Isolation in a Subterranean Well

摘要

A method is for zone isolation in a subterranean well. The well is provided with a pipe body at least in a portion. The method includes providing a plug over a longitudinal section of the well, the plug covering substantially the entire cross section of the well at least in a portion of the longitudinal section, so that the plug fills the inside, of a pipe body and an annulus between the outside of the pipe body and a surrounding well body.

主权项

1. A method for zone isolation in a subterranean well, the well being provided with a pipe body, at least in a portion, the method comprising:
(A) providing a plug over a longitudinal section of the well, the plug covering substantially the entire cross section of the well at least in a portion of the longitudinal section, so that the plug fills the inside of the pipe body and an annulus between the outside of the pipe body and a surrounding well body, wherein (A) comprises: (A1) lowering a perforation tool into the pipe body to the longitudinal section where the plug is to be set: (A2) forming perforations the pipe body along the longitudinal section the perforation tool; (A3) with a washing tool which is attached to a string allowing through-flow and which is lowered to the longitudinal section L1, pumping a washing fluid down the string and out into the pipe body via the washing tool; (A4) with a directional-control means connected to the washing tool, directing the washing fluid into the annulus between the outside of the pipe body and the surrounding well body; and (A5) pumping a fluidized plugging material down the string and out into the pipe body, and thereby also into the annulus the perforations in the pipe body.