One trip perforating and washing tool for plugging and abandoning wells

摘要

A single trip method allows for perforation, cleaning the annular space around the perforations in an existing tubular and then delivering a sealing material through a combination tool that is used for cleaning and then sealing. For sealing the tool is positioned by the lowermost perforations with a bypass around spaced seals that straddle the outlet port for the sealant. There is an open bypass through the tool and around the spaced seals as the sealant is delivered so that the sealant goes above and below the spaced seals. The open bypass allows the tool to be repositioned as the sealant is delivered. The tool is removed with the string. A separate through passage is selectively opened for removing excess sealant in conjunction with the bypass passages. The sealant can be squeezed with a seal on the string to effectively close the bypass letting pressure through the through passage squeeze.

主权项

1. A one trip method of plugging a borehole for well abandonment, comprising:
running in a combination wash and seal tool to a desired location in the borehole; locating said wash and seal tool above a plug previously disposed in an existing tubular adjacent to perforations; cleaning debris from an annular space around the perforations in the existing tubular with said tool; delivering a sealing material into said annular space with said tool after said cleaning; sealing the existing tubular and the surrounding annular space by said delivering; and repositioning said tool during said delivering with a bypass open through said tool to facilitate said repositioning.