Patent ID: 9458694
Filing Date: 2016-10-04
CPC Classification: E21B

Claim Text:
1. A method comprising: injecting a thermally degradable material at a desired depth into a liner having a plurality of openings, wherein the liner is suspended below a cemented casing in a wellbore of a well in a subterranean formation, wherein the thermally degradable material has a density about equal to or less than a density of fluid in the wellbore, and wherein the thermally degradable material extrudes through a lower portion of the liner into an annulus between the liner and the wellbore to plug an open hole interval of the well, wherein the thermally degradable material does not flow downward into a deeper part of the well; and circulating a cement into the liner above the thermally degradable material, wherein the cement extrudes through an upper portion of the liner into the annulus between the liner and the wellbore, displacing water from the wellbore and forming a solid cemented casing string, and wherein the cement is kept from sinking down the annulus between the liner and wellbore and separated from the deeper part of the well by the thermally degradable material.