Abstract: A well bore cleaning tool adapted for close tolerance well bores is provided comprising a plurality of cylindrical collars attached to an elongated cable by a plurality of corresponding bent sleeves. The collars are adapted for detachable securing on a casing pipe in a vertically spaced apart relationship to each other. Each sleeve is fixedly secured within a cutout of a corresponding collar by a strip juxtaposed over an exterior surface of the sleeve, opposing ends of the strip extending beyond the cutout for attachment to the corresponding collar, such that a minimal portion of the sleeve extends beyond an outside diameter of the collar. The elongated cable is threaded through the sleeves of the collars such that the cable extends along and in close proximity to the casing pipe, to thereby facilitate cleaning of a well bore in close tolerance conditions.

Abstract: The invention relates to a safety packer assembly for use in a cement-lined pipe. The assembly provides for the use of a packer body which carries one or more resilient collars that expand in response to a compression force created by rotation of an upper part of the packer body. A safety valve is provided in the upper part of the packer body to prevent escape of the downhole pressure. A safety centralizer is detachably secured to a lower part of the packer body, the centralizer being provided with a plurality of arcuate resilient members which extend along the length of the centralizer body and frictionally contact the wall of the cement-lined pipe to maintain the packer body in its predetermined position within the pipe and resist rotation of a lower part of the packer body when the upper part is rotated.