Acid soluble coating for well screens
AssigneeBaker International Corporation
InventorsKeith W. Sharp, Derry D. Sparlin
Life of this patent
Estimating the term…
Abstract
A well liner for a subterranean well is provided comprising an elongated tubular member which may be a wire wrapped screen having a plurality of slots or passages which are disposed longitudinally and circumferentially of and extending from the outer surface to the inner surface of the tubular member, and an impermeable inorganic matrix substantially filling said slots or passages and coated upon said inner and outer surfaces, said matrix being the reaction product of a first reactant consisting essentialy of magnesium oxide and a second reactant consisting essentially of magnesium chloride, in a solvent or solution therefor.
Claims9
A well liner comprising an elongate tubular member having a plurality of passageways disposed longitudinally and circumferentially of, and extending from the outer surface to the inner surface of, the tubular member, and an impermeable inorganic matrix substantially filling said passageways and coated upon said inner and outer surfaces, said inorganic matrix comprising the reaction product of a first reactant consisting essentially of magnesium oxide and a second reactant consisting essentially of magnesium chloride, in a solvent therefor.
A well liner comprising an elongate tubular member having a plurality of passageways disposed longitudinally and circumferentially of, and extending from the outer surface of the inner surface of, the tubular member, and an impermeable inorganic matrix substantially filling said passageways and coated upon said inner and said outer surfaces, said inorganic matrix comprising the reaction product of a first reactant consisting essentially of magnesium oxide and a second reactant consisting essentially of magnesium chloride, in an aqueous solvent therefor.
A well liner comprising an elongate tubular member having a plurality of passageways disposed longitudinally and circumferentially of and extending from the outer surface to the inner surface of the tubular member and an impermeable inorganic matrix substantially filling said passageways and coated upon said inner and outer surfaces, said matrix being removable from said inner and outer surfaces and from said passageways upon contact of said well liner with removing amounts of a removing agent selected from the class consisting of hydrochloric acid and sulfamic acid, said inorganic matrix comprising the reaction product of a first reactant consisting essentially of magnesium oxide and a second reactant consisting essentially of magnesium chloride, in a solvent therefor.
A method of coating a well liner comprising an elongate tubular member having a plurality of passageways disposed longitudinally and circumferentially of, and extending from the outer surface to the inner surface of the tubular member, said method comprising the steps of:
- (1) contacting said well liner with a coating amount of an impermeable inorganic matrix substantially filling said passageways and upon said inner and outer surfaces, said inorganic matrix comprising the reaction product of a first reactant consisting essentially of magnesium oxide and a second reactant consisting essentially of magnesium chloride, in a solvent therefor;
- and (2) drying said well liner by exposure to atmosphere.
A well liner comprising an elongate tubular member having a plurality of passageways disposed longitudinally and circumferentially of, and extending from the outer surface to the inner surface of, the tubular member, and an impermeable inorganic matrix coated upon said inner and outer surfaces, said inorganic matrix comprising the reaction product of a first reactant consisting essentially of magnesium oxide and a second reactant consisting essentially of magnesium chloride, in a solvent therefor.
Dependencies are inferred from the claim text.