In-Situ Polymerization of an Inflatable Composite Sleeve To Reline Damaged Tubing and Shut Off Perforations

Abstract

Summary Finding an effective solution to seal-off perforations, whether it be to reduce gas flow, reduce water cut, or to modify injection profiles, has long been a subject of concern. Several solutions for through tubing shut-off have been tried with a varying level of success. After several years of testing a new technology has been developed to manufacture a composite sleeve using elastomers, fibers, and thermosetting resins. The sleeve is run-in on electric wireline, inflated to push the composite against the inside of the casing, then heated to polymerize the resins. The running equipment is extracted to leave a pressure resistant inner lining in place. There is little diameter loss, leaning access to the well below, and opening up applications for tubing repair. Following successful field trials commercial operations have begun. The technology has been used not only for water and gas shut-off, but also for repairing damaged casings and tubings. This paper introduces the technology, describes the equipment used, and runs through the development and testing phases prior to beginning field operations. Typical examples of jobs carried out are cited, and some case histories are developed in greater detail.