Abstract: A hanger head assembly for coiled tubing that consists of a body member having an axial passage that includes plural, hydraulically actuated slips for holding the tubing at a selected position, and further includes a concentration double packer assembly that is hydraulically actuated to seal off the tubing annulus.

Abstract: Blow-out prevention apparatus consisting of a body housing having upper and lower annular chambers opening on an axial bore that provides communication into the wellbore. First and second toroidal-type packers are then arrayed around each of the upper and lower annular chambers, and an insert packer cylinder including upper and lower sleeve packers is disposed within the axial bore with upper and lower sleeve packers adjacent respective first and second toroidal packers. Upon emergency activation, the first and second toroidal packers are expanded inward to force the upper and lower sleeve packers inward thereby closing off the axial bore. An injector is then actuatable to provide rapid injection of a viscous plugging agent into the central void between the upper and lower sleeve packers.

Abstract: A flow control valve assembly is provided which, when connected to a rotatable drill string, prevents drainage of fluid from a standpipe and rotary hose of a drilling rig when fluid flow through the drill string is interrupted. The flow control valve assembly comprises a tubular body member or housing having a fluid flow passage extensive therethrough and a flow control valve supported within the fluid flow passage of the tubular body member. The flow control valve, which is a self-contained pressurized unit, is provided with an annular pressure cavity so that the flow control valve can be selectively opened and closed in response to pressure differential between the annular pressure cavity and the pressure of fluid in the fluid flow passage of the tubular body member.