Effect of Jet Perforating on Bond Strength of Cement

Abstract

Highest compressive strength cement has highest bond strength in tests in which cement is subjected to confining pressure; after perforating, bond strength is reduced to nearly zero when pipe is supported by weak cement; perforating does not affect bond strength, however, when pipe is supported by strong cement; pipe supported by weak cement is damaged by perforating with expendable jets, but is not damaged by perforating with hollow carrier gun; high strength c ements are recommended for oil wells that are to be perforated. (30055)