Method and apparatus for moulding protective tubing simultaneously with bore hole drilling
Method and apparatus for repairing well casings and the like
ApplicationNo. 768027 filed on 12/13/1996
US Classes:166/287, Removable molding or forming means166/57, WITH HEATING, REFRIGERATING OR HEAT INSULATING MEANS166/187, Expanded by confined fluid from central chamber, pump or plunger166/207, Expansible casing166/277, Repairing object in well166/288, Including heating166/295, Organic material is resin or resinous166/300Chemical inter-reaction of two or more introduced materials (e.g., selective plugging or surfactant)
ExaminersPrimary: Suchfield, George A.
Attorney, Agent or Firm
International ClassesE21B 033/13
AbstractAn apparatus and method for sealing an inner wall of a portion of a casing positioned in a well employs an inflatable sleeve having an outer surface and a conformable composite sleeve of curable composition extending around the outer surface of the inflatable sleeve. The inflatable sleeve is inflated to compress the composite sleeve against the surface of the inner casing wall. A local, activatable energy source, positioned downhole to deliver heat to the composite sleeve, is activated to cure the composite sleeve to form a hardened sleeve. The hardened sleeve presses against the inner wall of the casing portion to create a fluid seal. The embodiments shown have a number of preferred features. The local energy source includes an exothermic heat energy source for generating heat energy to cure the composite sleeve. The composite sleeve includes a mixture of resin and a curing agent, and the exothermic heat source includes thermite. The thermite includes a composition having a metal oxide and a reductant. A starter mix is positioned adjacent the exothermic heat energy source, and the starter mix is ignited to start an exothermic reaction in the heat energy source. A conformable layer extends around the composite sleeve, with the layer serving to form a seal between the composite sleeve and the inner wall of the casing portion.
Field of SearchWITH HEATING, REFRIGERATING OR HEAT INSULATING MEANS
Expanded by confined fluid from central chamber, pump or plunger
EXPANSIBLE ANCHOR OR CASING
Repairing object in well
Removable molding or forming means
Organic material is resin or resinous
Chemical inter-reaction of two or more introduced materials (e.g., selective plugging or surfactant)
Heating, cooling or insulating