adhesive thermoplastic resin application_number US 64585009 A description adhesive thermoplastic materials commonly known as hot melt glues or hot melt adhesives may be incorporated into drilling fluids spotting fluids and cement slurries and applied to casings equipment and hardware to improve the sealing and bonding of the components of a well adhesive thermoplastic materials are commonly used in household hot melt glue adhesives and in tough resilient non abrasive elastomers and sealants in the present invention adhesive thermoplastic materials are selected based upon melting point thermal stability material properties at well operating temperatures well geothermal static temperature circulating temperature of the wellbore and zonal isolation requirements for the well of particular interest are adhesive thermoplastic polymers or resins that have reactive chemical groups which promote adhesion and can react with components of the cement unremoved drilling fluid formation and well casings to form a seal repair a seal destroyed by stresses in the well alter the material properties of the cement or any remaining drilling fluids in the wellbore and to make the cement or other remaining fluids more resistant to damage under the stresses of well operating conditions the adhesive thermoplastic polymers or resins can be used to form sealants with drilling fluids and cement slurries to alter the material properties of cements in particular increasing ductility to seal leaking connections in casing strings to seal weak or highly permeable formations and to heal loss circulation problems or to seal microannuli between cement and casing s examples of suitable adhesive thermoplastics for use in the present invention include certain acrylic acid copolymers and ionomers and salts thereof suitable copolymers include but are not limited to ethylene acrylic acid copolymers ethylene methacrylic acid copolymers ethylene vinyl acetate copolymers ethylene vinylphosphonic acid copolymers and ionomers or salts of.