Abstract: A test and isolation tool for wells of expanded utility and reduced manufacturing cost is disclosed. The outside diameter of the tool is significantly reduced and its overall construction is simplified by total elimination of a previously-employed annular piston. In lieu thereof, the outer surface of a mandrel forms one wall of a cylinder chamber for interfitting axially displaceable seal energizing rings which operate as pistons. The interior surface of a skirt portion of one seal energizing ring forms the other wall of the cylinder chamber for the two rings.

Abstract: To avoid the excessive cost and time required to pull the wear bushing from a sub-sea well head in deep water to enable frequent periodic testing of the blow-out preventer, a casing integrity test tool is assembled to a wear bushing running and retrieving tool and this assembly is run into the well until it lands on a seating surface of the wear bushing. A dart for delivering tool energizing pressurized fluid is dropped through the drill pipe and pressurized to a pressure above the pressure being employed to test the blow-out preventer. While maintaining pressure on the drill pipe and dart, the blow-out preventer is tested except for the blind rams. After completion of the testing, pressure is relieved on the drill pipe, the dart is retrieved, and dry string retrieval of the test tool assembly is then carried out.

Abstract: A device for enabling the detection and measurement of wear deformities in well casings and similar well components is installed on a test and isolation tool in the space normally occupied by one of the tool test seal assemblies and possessing the exact configuration of such assembly. Instead of the resilient test seal element normally employed having elastic memory, a non-resilient material without significant elastic memory is used so that it will retain a deformed shape indicative of the shape and size of a wear deformity in a well component when the device is energized with fluid pressure applied to the test tool.

Abstract: A combined well head housing test tool and well head leak isolation tool is disclosed. Annular seals to test the integrity of well head housing sealing surfaces are energized by pressurized fluid delivered through a dart in the center bore of a tool mandrel and through a radial port of the mandrel to a piston actuator which acts on the seals to energize them. Test fluid under test pressure is separately delivered to a chamber of the tool in communication with the seals through a port formed internally in a combined nut and seal support unit.

Abstract: A combined test and isolation tool for sub-sea well equipment is used particularly for testing the integrity of internal sealing surfaces of sub-sea well head housings and also for testing casing hangers and their seals. The same tool is run on drill pipe in a sub-sea well to isolate a casing hanger seal from components of the well blow-out preventer to determine accurately and with finality where a detected leak originates. The use of the tool enables costly well head housings, casing hangers and seals normally discarded following a single usage to be reused with safety and efficiency and at a great savings in cost.

Abstract: A combined test and isolation tool for sub-sea well equipment is used particularly for testing the integrity of internal sealing surfaces of sub-sea well head housings and also for testing casing hangers and their seals. The same tool is run on drill pipe in a sub-sea well to isolate a casing hanger seal from components of the well blow-out preventer to determine accurately and with finality where a detected leak originates. The use of the tool enables costly well head housings, casing hangers and seals normally discarded following a single usage to be reused with safety and efficiency and at a great savings in cost.