Method for Combined Cleaning and Plugging in a Well and Flushing Tool for Flushing in a Well

摘要

A method is for the combined perforation, cleaning, and the subsequent plugging of a longitudinal section of a well. The well is provided with two pipe bodies placed substantially concentrically. The method includes lowering a perforation tool into the innermost pipe body to the longitudinal section, forming perforations in both pipe bodies along the longitudinal section with the perforation tool, cleaning the longitudinal section with a flushing tool which is attached to a lower portion of a string allowing through-flow, pumping a fluidized plugging material down the string and into the innermost pipe body at the longitudinal section, and placing the fluidized plugging material in the innermost pipe body, and thereby also into the entire cross section of the well via the perforations within the longitudinal section. A flushing tool is for cleaning the longitudinal section of the well.

主权项

1. A method for the combined perforation and cleaning of annuli in a well over a longitudinal section of the well and the subsequent plugging of the longitudinal section, the well being provided, at least over the longitudinal section to be plugged, with at least two pipe bodies placed substantially concentrically, the method comprising:
(A) lowering a perforation tool into the innermost pipe body to said longitudinal section of the well; (B) forming perforations both pipe bodies along the longitudinal section by means of the perforation tool; (C) with a flushing tool which is attached to a lower portion of a string allowing through-flow and which is lowered into the innermost pipe body to the longitudinal section pumping, a flushing, fluid down the string, out through at least one outlet of the flushing tool, into the innermost pipe body and further out into the annulus/annuli between the pipe bodies and into the annulus outside the outermost pipe body via the perforations; (D) pumping a fluidized plugging material down the string and into the innermost pipe body at the longitudinal section; and (E) placing the fluidized plugging material in the innermost pipe body, and thereby also in the annuli via the perforations in the pipe bodies, along at least said longitudinal section of the well, whereby both the pipe bodies and the annuli are plugged along at least said longitudinal section of the well.