Abstract: A down-hole tool comprises a generally tubular body for connection in a drill string, the body typically having an upper tubular member and a lower tubular member interconnected to be axially secured and relatively rotatable, and a frangible element securing the upper and lower members together rotationally and adapted to rupture at a predetermined load

Abstract: A down-hole tool for use in an oil or gas well is provided with detachable components that are held to a body or tool housing by longitudinal mechanical fasteners disposed in a generally radial orientation. The mechanical fasteners allow for the components to be quickly removed and refurbished or replaced, while also permitting radial movement or floating of the components during operation of the tool. A spring may be incorporated to bias the components in a radial outward direction during operation.

Abstract: Apparatus and method is disclosed for setting inflatable packers in a well bore which includes the transporting of settable fluid from the surface with a work string or liner as it is run in the well. The invention therefore negates the requirement of having to pump cement or the like to precise locations down hole to the vicinity of the packers to be set.

Abstract: A circulating tool for circulating fluid in a borehole comprising a tubular assembly having an axial through passage between an inlet and a first outlet, a second outlet extending generally transversely of the tubular assembly, and an obturating member moveable relative to the tubular assembly between a first position closing the second outlet and a second position at which the second outlet is open, wherein the obturating member is also moveable between an engaging position at which it is engaged with the tubular assembly and a non-engaging position at which it is not so engaged with the tubular assembly, and wherein when the obturating member is in the first position it may be in either the engaging position or the non-engaging position.

Abstract: A tool or sub for use in a well bore is adapted to manipulate the circulation path of fluid through a drill string or work string in which the tool is connected. The apparatus has a body member defining an axial flow path with one or more radial outlets that may be opened or closed by respective valve members in use.

Abstract: A well cleaning tool for cleaning the inside walls of a well casing has at least two types of cleaning members; for example it may have a row of scraper blades and a row of brushes. The tool may also include one or more rotatable stabilizers that serve to maintain contact of the tool with the internal casing walls. The tool provides for obtaining the benefits of different types of cleaning members from a single trip into a well bore.

Abstract: A tool for use in a well bore has a housing attachable to a work string or drill string wherein the housing supports a floating component that is free to move in the lateral or radial members relative to the housing within predetermined limits. The floating component is suitable for supporting active tool components such as wire bristles, scraper blades or other functional apparatus. Typically, the floating component is provided as a sleeve around the housing held within axial limits, while enabling radial movement.

Abstract: An apparatus and method for circulating fluid in a borehole is described. The apparatus comprises a tubular assembly (1; 40; 60) which has an axial through passage (21, 18; 47; 19) between a fluid inlet (21) and first fluid outlet (19). The fluid inlet (21) and the first fluid outlet (19) are connected (13, 20) in a work string which is supported from the surface above the borehole. There is a second outlet (16; 42, 48) which extends generally transversely of the assembly (1; 40; 60). An obturating member (9) is moveable between a first position in which the second fluid outlet (16; 42, 48) is closed and a second position which permits fluid flow through the second outlet (16; 42, 48). An engagement mechanism (12, 6, 7; 68, 69) is moveable between an engaged configuration in which the obturating member (9) is maintained in one of the first and second positions, and a disengaged configuration in which the obturating member (9) is in the other of the first and second positions.

Abstract: Apparatus for cleaning the inside walls of a pipeline, well casing or other tubing, comprises a supporting structure upon which are supported one or more cleaning members, and retraction means for controllably retracting the cleaning members so as to avoid their contact with the aforesaid tubing when desired. The apparatus is also provided with a sleeve to effect contact between the retractable cleaning members and the pipeline, well casing or other tubing. Typically, the apparatus is provided in the form of a well cleanup tool.