Permeable lost circulation drilling liner

摘要

A layer of permeable material is positioned on an area of lost circulation lithology in a wellbore. An example of the permeable material includes a planar member with perforations that is rolled into and retained in an annular configuration. The permeable material is lowered into the wellbore adjacent the area of lost circulation and allowed to unroll and expand radially outward against walls of the wellbore. The wellbore wall along the area of lost circulation lithology can be reamed out so the layer of permeable material is out of the way of a drill bit. A bridging agent can be applied on the interface where the permeable material contacts the wellbore wall.

主权项

1. A method of wellbore operations comprising:
providing a first wellbore liner having a tubular shape with an inner radius and an outer radius and perforations extending through a sidewall of the first wellbore liner; disposing the first wellbore liner in a first wellbore and adjacent a location where fluid flow communicates between the first wellbore and a formation adjacent the first wellbore; providing a first fluid with entrained particles; creating a flow barrier across the first wellbore liner by flowing the first fluid through the perforations, so that the entrained particles become wedged in the perforations; providing a second liner having perforations substantially the same size as perforations in the first liner; disposing the second liner in a second wellbore and at a location where fluid communication takes place between the second wellbore and a formation adjacent the second wellbore; providing a second fluid having entrained particles that are of a different size than particles entrained in the first fluid; and forming a flow barrier across the second liner by flowing the second fluid through the perforations in the second liner.